AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies flexcan_get_berr_counter() in drivers/net/can/flexcan/flexcan-core.c. FlexCAN is an on-chip CAN controller integrated into Freescale/NXP SoCs (ARM, PowerPC, ColdFire) and binds exclusively via platform/OF matching. It requires physical SoC hardware not emulated in standard QEMU or GCE virtual environments on amd64. Consequently, the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit 225935ebc76e59f511e8e153577419167aee9911\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Sep 15 07:39:39 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c\nindex 06d5d35fc1b55..b08779ee2a0a3 100644\n--- a/drivers/net/can/flexcan/flexcan-core.c\n+++ b/drivers/net/can/flexcan/flexcan-core.c\n@@ -765,6 +765,9 @@ static int flexcan_get_berr_counter(const struct net_device *dev,\n \tconst struct flexcan_priv *priv = netdev_priv(dev);\n \tint err;\n \n+\tif (!netif_running(dev))\n+\t\treturn 0;\n+\n \terr = pm_runtime_resume_and_get(priv-\u003edev);\n \tif (err \u003c 0)\n \t\treturn err;\n"
}

core

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies flexcan_get_berr_counter() in drivers/net/can/flexcan/flexcan-core.c. FlexCAN is an on-chip CAN controller integrated into Freescale/NXP SoCs (ARM, PowerPC, ColdFire) and binds exclusively via platform/OF matching. It requires physical SoC hardware not emulated in standard QEMU or GCE virtual environments on amd64. Consequently, the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.

================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.

- REACHABILITY IS THE PRIMARY GATE:
  Fuzzing can only discover bugs in code that can actually execute in standard virtualized
  environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
  If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
  regardless of whether it adds assertions or complex logic.

- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
  Patch authors routinely label changes as "cleanups", "refactorings", or state
  "No functional change intended". Do NOT take these claims at face value.
  Code refactorings that rearrange logic, introduce helper functions, or alter state management
  in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
  If reachable executable code is modified or refactored, it MUST be fuzzed.

- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
  When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
  BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
  Even if the author believes the invariant always holds, fuzzing is essential to verify whether
  an unusual sequence of operations can violate it.

================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:

- Non-kernel and non-executable changes:
  * Modifications to Documentation/, comments, or spelling fixes.
  * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
    that do not affect the compiled kernel image (vmlinux) or kernel modules.
  * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
    that do not alter control flow or data structures.
  * Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
  * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
    ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
  * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
    physical PCI hot-unplug or manual sysfs driver unbinding.
  * Code paths exclusive to architectures other than the target architecture.

================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
  * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
    BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
  * Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
  * Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
  * Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).

================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:

- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
  Do NOT list generic, ubiquitous functions called by almost every program in the corpus
  (including, but not limited to: general memory allocators and deallocators, page fault
  and trap handlers, or core synchronization primitives; this is not an exhaustive list).
  Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
  which severely dilutes fuzzing effort away from the actual changes.

- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
  List functions that specifically implement the logic being added or altered, or direct API entrypoints
  for the subsystem feature under review.

- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
  Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
  distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
  If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
  functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).

================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit 225935ebc76e59f511e8e153577419167aee9911
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Sep 15 07:39:39 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 06d5d35fc1b55..b08779ee2a0a3 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -765,6 +765,9 @@ static int flexcan_get_berr_counter(const struct net_device *dev,
 	const struct flexcan_priv *priv = netdev_priv(dev);
 	int err;
 
+	if (!netif_running(dev))
+		return 0;
+
 	err = pm_runtime_resume_and_get(priv->dev);
 	if (err < 0)
 		return err;

gemini-3.8-flash

null

null

							input: 2893
							output: 31
							thoughts: 313
						

**My Initial Thoughts on the FlexCAN Patch**

Okay, let's see what we have here. This diff in `drivers/net/can/flexcan/flexcan-core.c` seems straightforward enough at first glance. It's a conditional check before retrieving the bus error counter, ensuring the network interface is running. The addition of `if (!netif_running(dev))` immediately catches my eye, I wonder why it was added.

My initial thought is to assess the context. What is the architecture this FlexCAN driver targets? Is this something likely to be seen in a standard virtualized environment like QEMU on x86-64, or is it a more embedded or specialized CAN controller? I need to understand if this is a driver for hardware that I'm likely to encounter frequently.

Let me take a look at the surrounding code to determine its purpose. Let me check the Kconfig under `drivers/net/can/flexcan/` to get a better grasp of the driver's configuration options and dependencies. Is the check necessary or a guard against an expected condition or race condition? It's important to understand the *why* behind this change.

{
  "Expression": "config CAN_FLEXCAN",
  "PathPrefix": "drivers/net/can"
}

{
  "Output": "drivers/net/can/Kconfig=109=config CAN_CAN327\n--\ndrivers/net/can/Kconfig-126-\ndrivers/net/can/Kconfig:127:config CAN_FLEXCAN\ndrivers/net/can/Kconfig-128-\ttristate \"Support for Freescale FLEXCAN based chips\"\n"
}

gemini-3.8-flash

null

null

							input: 3582
							output: 36
							thoughts: 21
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the CAN Bus Configuration Options**

Okay, let's dive in. I need to refresh my memory on the CAN driver configuration options, specifically the ones related to, say, the MCP2515 or similar. I'll start by taking a look at `drivers/net/can/Kconfig`, focusing around line 127. That's usually where the meat of the high-level CAN bus options are defined, where the architecture-specific configs get their hooks in. I'm expecting to see dependencies and maybe a few menu entries that will shed light on the design choices made, perhaps options for different CAN controllers, data rates, or features like CAN FD support. I'm hoping to quickly identify the relevant configuration symbols I'll need to know. Time to see what Kconfig has in store.

{
  "File": "drivers/net/can/Kconfig",
  "FirstLine": 125,
  "LineCount": 25
}

{
  "Contents": " 125:\t\t  If this driver is built as a module, it will be called can327.\n 126:\t\n 127:\tconfig CAN_FLEXCAN\n 128:\t\ttristate \"Support for Freescale FLEXCAN based chips\"\n 129:\t\tdepends on OF || COLDFIRE || COMPILE_TEST\n 130:\t\tdepends on HAS_IOMEM\n 131:\t\tselect CAN_RX_OFFLOAD\n 132:\t\thelp\n 133:\t\t  Say Y here if you want to support for Freescale FlexCAN.\n 134:\t\n 135:\tconfig CAN_GRCAN\n 136:\t\ttristate \"Aeroflex Gaisler GRCAN and GRHCAN CAN devices\"\n 137:\t\tdepends on OF \u0026\u0026 HAS_DMA \u0026\u0026 HAS_IOMEM\n 138:\t\thelp\n 139:\t\t  Say Y here if you want to use Aeroflex Gaisler GRCAN or GRHCAN.\n 140:\t\t  Note that the driver supports little endian, even though little\n 141:\t\t  endian syntheses of the cores would need some modifications on\n 142:\t\t  the hardware level to work.\n 143:\t\n 144:\tconfig CAN_JANZ_ICAN3\n 145:\t\ttristate \"Janz VMOD-ICAN3 Intelligent CAN controller\"\n 146:\t\tdepends on MFD_JANZ_CMODIO\n 147:\t\thelp\n 148:\t\t  Driver for Janz VMOD-ICAN3 Intelligent CAN controller module, which\n 149:\t\t  connects to a MODULbus carrier board.\n"
}

gemini-3.8-flash

null

null

							input: 4252
							output: 33
							thoughts: 50
						

**FlexCAN Dependency Deep Dive**

Okay, so I'm looking at this `config CAN_FLEXCAN` setting. It's dependent on a few things: `OF || COLDFIRE || COMPILE_TEST` and `HAS_IOMEM`. That makes sense. I can see the potential link to `OF` being relevant to Device Tree use. I also get the inclusion of `COLDFIRE`, a legacy platform to support, as well as a quick compile test. IOMEM makes sense too, suggesting it needs memory mapping.

But my immediate question is, is FlexCAN actually implemented as a platform driver? Given the general structure of the kernel, I'm leaning that way, but I should double-check. Let me quickly jump into `flexcan-core.c` and confirm my expectation. Knowing the architecture of the driver will help me understand what these Kconfig dependencies actually signify within the code.

{
  "Expression": "module_platform_driver",
  "PathPrefix": "drivers/net/can/flexcan"
}

{
  "Output": "drivers/net/can/flexcan/flexcan-core.c=2444=static struct platform_driver flexcan_driver = {\n--\ndrivers/net/can/flexcan/flexcan-core.c-2454-\ndrivers/net/can/flexcan/flexcan-core.c:2455:module_platform_driver(flexcan_driver);\ndrivers/net/can/flexcan/flexcan-core.c-2456-\n"
}

gemini-3.8-flash

null

null

							input: 4653
							output: 44
							thoughts: 17
						

Here's my take on the thought process, as if I were the one thinking it:

**Diving into the CAN Driver Implementation**

Okay, time to get my hands dirty. I need to understand how this FlexCAN driver actually works at its core. Let's start with `flexcan-core.c`. I expect to find the meat of the platform driver details in there - the registration, probe, and remove functions, and the overall structure of how the hardware interaction is managed. I'm looking for the essential glue code that links the generic CAN framework with the specific FlexCAN silicon. I need to quickly identify the key data structures, the interrupt handling setup, and the way the controller registers are accessed. Let's get to it!

{
  "File": "drivers/net/can/flexcan/flexcan-core.c",
  "FirstLine": 2420,
  "LineCount": 40
}

{
  "Contents": "2420:\t\n2421:\t\tif (netif_running(dev)) {\n2422:\t\t\tint err;\n2423:\t\n2424:\t\t\tif (!(device_may_wakeup(device) \u0026\u0026\n2425:\t\t\t      priv-\u003edevtype_data.quirks \u0026 FLEXCAN_QUIRK_SETUP_STOP_MODE_SCMI)) {\n2426:\t\t\t\terr = pm_runtime_force_resume(device);\n2427:\t\t\t\tif (err)\n2428:\t\t\t\t\treturn err;\n2429:\t\t\t}\n2430:\t\n2431:\t\t\tif (device_may_wakeup(device))\n2432:\t\t\t\tflexcan_enable_wakeup_irq(priv, false);\n2433:\t\t}\n2434:\t\n2435:\t\treturn 0;\n2436:\t}\n2437:\t\n2438:\tstatic const struct dev_pm_ops flexcan_pm_ops = {\n2439:\t\tSET_SYSTEM_SLEEP_PM_OPS(flexcan_suspend, flexcan_resume)\n2440:\t\tSET_RUNTIME_PM_OPS(flexcan_runtime_suspend, flexcan_runtime_resume, NULL)\n2441:\t\tSET_NOIRQ_SYSTEM_SLEEP_PM_OPS(flexcan_noirq_suspend, flexcan_noirq_resume)\n2442:\t};\n2443:\t\n2444:\tstatic struct platform_driver flexcan_driver = {\n2445:\t\t.driver = {\n2446:\t\t\t.name = DRV_NAME,\n2447:\t\t\t.pm = \u0026flexcan_pm_ops,\n2448:\t\t\t.of_match_table = flexcan_of_match,\n2449:\t\t},\n2450:\t\t.probe = flexcan_probe,\n2451:\t\t.remove = flexcan_remove,\n2452:\t\t.id_table = flexcan_id_table,\n2453:\t};\n2454:\t\n2455:\tmodule_platform_driver(flexcan_driver);\n2456:\t\n2457:\tMODULE_AUTHOR(\"Sascha Hauer \u003ckernel@pengutronix.de\u003e, \"\n2458:\t\t      \"Marc Kleine-Budde \u003ckernel@pengutronix.de\u003e\");\n2459:\tMODULE_LICENSE(\"GPL v2\");\n"
}

gemini-3.8-flash

null

null

							input: 5494
							output: 44
							thoughts: 66
						

Here's my take on those thoughts:

**Analyzing the CAN Driver's Identification Strategy**

Okay, let's dive into this `flexcan_driver`. First off, it's a platform driver, so we're talking about hardware-specific configuration, which is good. Now, the interesting part is how it's identifying the hardware it supports. It seems to be using two primary methods, and I need to investigate them further. It's either matching based on the `of_match_table = flexcan_of_match` or the `id_table = flexcan_id_table`. I need to figure out what's in `flexcan_of_match` and `flexcan_id_table` to understand the specific hardware identifiers and properties this driver is looking for. This will give me a better understanding of how the device is selected and initialized, and if it's using Device Tree or a more traditional ID-based system.

{
  "File": "drivers/net/can/flexcan/flexcan-core.c",
  "FirstLine": 2375,
  "LineCount": 45
}

{
  "Contents": "2375:\t\n2376:\t\treturn 0;\n2377:\t}\n2378:\t\n2379:\tstatic int __maybe_unused flexcan_runtime_resume(struct device *device)\n2380:\t{\n2381:\t\tstruct net_device *dev = dev_get_drvdata(device);\n2382:\t\tstruct flexcan_priv *priv = netdev_priv(dev);\n2383:\t\n2384:\t\treturn flexcan_clks_enable(priv);\n2385:\t}\n2386:\t\n2387:\tstatic int __maybe_unused flexcan_noirq_suspend(struct device *device)\n2388:\t{\n2389:\t\tstruct net_device *dev = dev_get_drvdata(device);\n2390:\t\tstruct flexcan_priv *priv = netdev_priv(dev);\n2391:\t\n2392:\t\tif (netif_running(dev)) {\n2393:\t\t\tint err;\n2394:\t\n2395:\t\t\tif (device_may_wakeup(device))\n2396:\t\t\t\tflexcan_enable_wakeup_irq(priv, true);\n2397:\t\n2398:\t\t\t/* For FLEXCAN_QUIRK_SETUP_STOP_MODE_SCMI, it need ATF to send\n2399:\t\t\t * to SM through SCMI protocol, SM will assert the IPG_STOP\n2400:\t\t\t * signal. But all this works need the CAN clocks keep on.\n2401:\t\t\t * After the CAN module get the IPG_STOP mode, and switch to\n2402:\t\t\t * STOP mode, whether still keep the CAN clocks on or gate them\n2403:\t\t\t * off depend on the Hardware design.\n2404:\t\t\t */\n2405:\t\t\tif (!(device_may_wakeup(device) \u0026\u0026\n2406:\t\t\t      priv-\u003edevtype_data.quirks \u0026 FLEXCAN_QUIRK_SETUP_STOP_MODE_SCMI)) {\n2407:\t\t\t\terr = pm_runtime_force_suspend(device);\n2408:\t\t\t\tif (err)\n2409:\t\t\t\t\treturn err;\n2410:\t\t\t}\n2411:\t\t}\n2412:\t\n2413:\t\treturn 0;\n2414:\t}\n2415:\t\n2416:\tstatic int __maybe_unused flexcan_noirq_resume(struct device *device)\n2417:\t{\n2418:\t\tstruct net_device *dev = dev_get_drvdata(device);\n2419:\t\tstruct flexcan_priv *priv = netdev_priv(dev);\n"
}

gemini-3.8-flash

null

null

							input: 6500
							output: 41
							thoughts: 16
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the CAN Match Tables**

Okay, so I need to dive into the CAN filtering logic. Let's start by navigating into `flexcan-core.c`. My primary interest right now is understanding how the incoming CAN messages are matched and routed. I want to zero in on the match tables. I'm assuming there's some sort of lookup mechanism, perhaps a hash table or a more direct indexing method, to quickly determine which mailboxes or buffers the incoming frames get directed to. I need to figure out how the filter masks and identifiers interact, and how the hardware actually performs the matching to optimize how the CAN data is processed. Let's get to it.

{
  "Expression": "flexcan_of_match|flexcan_id_table",
  "PathPrefix": "drivers/net/can/flexcan"
}

{
  "Output": "drivers/net/can/flexcan/flexcan-core.c=2025=static int flexcan_setup_stop_mode(struct platform_device *pdev)\n--\ndrivers/net/can/flexcan/flexcan-core.c-2061-\ndrivers/net/can/flexcan/flexcan-core.c:2062:static const struct of_device_id flexcan_of_match[] = {\ndrivers/net/can/flexcan/flexcan-core.c-2063-\t{ .compatible = \"fsl,imx8qm-flexcan\", .data = \u0026fsl_imx8qm_devtype_data, },\n--\ndrivers/net/can/flexcan/flexcan-core.c-2078-};\ndrivers/net/can/flexcan/flexcan-core.c:2079:MODULE_DEVICE_TABLE(of, flexcan_of_match);\ndrivers/net/can/flexcan/flexcan-core.c-2080-\ndrivers/net/can/flexcan/flexcan-core.c:2081:static const struct platform_device_id flexcan_id_table[] = {\ndrivers/net/can/flexcan/flexcan-core.c-2082-\t{\n--\ndrivers/net/can/flexcan/flexcan-core.c-2088-};\ndrivers/net/can/flexcan/flexcan-core.c:2089:MODULE_DEVICE_TABLE(platform, flexcan_id_table);\ndrivers/net/can/flexcan/flexcan-core.c-2090-\n--\ndrivers/net/can/flexcan/flexcan-core.c=2444=static struct platform_driver flexcan_driver = {\n--\ndrivers/net/can/flexcan/flexcan-core.c-2447-\t\t.pm = \u0026flexcan_pm_ops,\ndrivers/net/can/flexcan/flexcan-core.c:2448:\t\t.of_match_table = flexcan_of_match,\ndrivers/net/can/flexcan/flexcan-core.c-2449-\t},\n--\ndrivers/net/can/flexcan/flexcan-core.c-2451-\t.remove = flexcan_remove,\ndrivers/net/can/flexcan/flexcan-core.c:2452:\t.id_table = flexcan_id_table,\ndrivers/net/can/flexcan/flexcan-core.c-2453-};\n"
}

gemini-3.8-flash

null

null

							input: 7342
							output: 44
							thoughts: 15
						

Here's my attempt at summarizing the thought process, tailored for an expert audience and written in the first person:

**Investigating the `flexcan_id_table`**

Okay, so I need to understand what this `flexcan_id_table` contains. My intuition is telling me it's likely a structure or table that maps identifiers related to the FlexCAN peripheral. Given the naming convention, I suspect it's crucial for filtering, acceptance masking, or potentially ID assignment within the CAN bus communication framework. I want to see how these IDs are being managed. I'll need to figure out the table's structure – is it an array, a linked list, or something more complex? The size and the data types of its elements will be key to understanding its intended use and potential limitations. I need to quickly identify where the table is defined, how it's populated (static initialization? dynamic updates?), and where it's referenced in the code. Understanding the context of how this table is used will be crucial for any debugging or optimization efforts. Let's dig in and see what's actually in there.

{
  "File": "drivers/net/can/flexcan/flexcan-core.c",
  "FirstLine": 2080,
  "LineCount": 20
}

{
  "Contents": "2080:\t\n2081:\tstatic const struct platform_device_id flexcan_id_table[] = {\n2082:\t\t{\n2083:\t\t\t.name = \"flexcan-mcf5441x\",\n2084:\t\t\t.driver_data = (kernel_ulong_t)\u0026fsl_mcf5441x_devtype_data,\n2085:\t\t}, {\n2086:\t\t\t/* sentinel */\n2087:\t\t},\n2088:\t};\n2089:\tMODULE_DEVICE_TABLE(platform, flexcan_id_table);\n2090:\t\n2091:\tstatic int flexcan_probe(struct platform_device *pdev)\n2092:\t{\n2093:\t\tconst struct flexcan_devtype_data *devtype_data;\n2094:\t\tstruct net_device *dev;\n2095:\t\tstruct flexcan_priv *priv;\n2096:\t\tstruct regulator *reg_xceiver;\n2097:\t\tstruct phy *transceiver;\n2098:\t\tstruct clk *clk_ipg = NULL, *clk_per = NULL;\n2099:\t\tstruct flexcan_regs __iomem *regs;\n"
}

gemini-3.8-flash

null

null

							input: 7961
							output: 43
							thoughts: 15
						

Okay, let's break down this `flexcan_get_berr_counter` function.

**Analyzing the `flexcan_get_berr_counter` Function**

Right, so I'm looking at this function, `flexcan_get_berr_counter`. The name itself is pretty self-explanatory – it's designed to retrieve the bus error counter from a FlexCAN peripheral. Given my understanding of CAN controllers and the critical role of error detection in ensuring reliable communication, this is a core function. I'll need to understand how this is implemented. First I need to know where the error counters are located in the CAN controller's register map. Is it a single register, or is it a field within a larger status register? Knowing this is vital to understanding the function's access method.

I expect this function will likely involve reading a specific register or a field within a register of the FlexCAN peripheral. There are typically different error counters – transmit error counter (TEC) and receive error counter (REC) – so the function's parameters should specify which one is of interest. Are we accessing both? Does it offer bit-field granularity to check individual counters? Or does it offer both? I'll have to see the code. I'm hoping it's well-written, with appropriate error handling – what happens if the peripheral isn't initialized, or the pointer to the CAN controller's base address is invalid? A robust implementation would include checks for these conditions, perhaps returning an error code or using assertions to catch unexpected scenarios.

Furthermore, how does the function handle potential race conditions? Multiple tasks might try to access the error counters simultaneously. Does it use any locking mechanisms or atomic operations to ensure data integrity? I'll be looking for that. The underlying hardware details are crucial for performance. It's likely this is going to be written with register access in mind rather than the data being stored on the heap. I want to know about how this is written so I can be sure I can adapt the function to my needs.

{
  "File": "drivers/net/can/flexcan/flexcan-core.c",
  "FirstLine": 760,
  "LineCount": 35
}

{
  "Contents": " 760:\t}\n 761:\t\n 762:\tstatic int flexcan_get_berr_counter(const struct net_device *dev,\n 763:\t\t\t\t\t    struct can_berr_counter *bec)\n 764:\t{\n 765:\t\tconst struct flexcan_priv *priv = netdev_priv(dev);\n 766:\t\tint err;\n 767:\t\n 768:\t\tif (!netif_running(dev))\n 769:\t\t\treturn 0;\n 770:\t\n 771:\t\terr = pm_runtime_resume_and_get(priv-\u003edev);\n 772:\t\tif (err \u003c 0)\n 773:\t\t\treturn err;\n 774:\t\n 775:\t\terr = __flexcan_get_berr_counter(dev, bec);\n 776:\t\n 777:\t\tpm_runtime_put(priv-\u003edev);\n 778:\t\n 779:\t\treturn err;\n 780:\t}\n 781:\t\n 782:\tstatic netdev_tx_t flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)\n 783:\t{\n 784:\t\tconst struct flexcan_priv *priv = netdev_priv(dev);\n 785:\t\tstruct canfd_frame *cfd = (struct canfd_frame *)skb-\u003edata;\n 786:\t\tu32 can_id;\n 787:\t\tu32 data;\n 788:\t\tu32 ctrl = FLEXCAN_MB_CODE_TX_DATA | ((can_fd_len2dlc(cfd-\u003elen)) \u003c\u003c 16);\n 789:\t\tint i;\n 790:\t\n 791:\t\tif (can_dev_dropped_skb(dev, skb))\n 792:\t\t\treturn NETDEV_TX_OK;\n 793:\t\n 794:\t\tnetif_stop_queue(dev);\n"
}

gemini-3.8-flash

null

null

							input: 8979
							output: 37
							thoughts: 56
						

Here's my thought process, as if I were considering this code:

**Analyzing the `flexcan_get_berr_counter` Function**

Okay, so `flexcan_get_berr_counter` is clearly part of the CAN subsystem, specifically tied into `do_get_berr_counter`. My immediate question is: where is this function actually being *used* or *assigned* within the larger framework? I need to understand its context. Since this looks like a FLEXCAN specific function, a quick search in `flexcan-core.c` makes the most sense as a starting point. Let's dig in and see what that file reveals about its implementation and integration within the FLEXCAN driver. I'm expecting to find its role, and how it is employed to retrieve the bus error counter. I anticipate it will be essential for monitoring CAN bus health within the FLEXCAN implementation.

{
  "Expression": "flexcan_get_berr_counter",
  "PathPrefix": "drivers/net/can/flexcan"
}

{
  "Output": "drivers/net/can/flexcan/flexcan-core.c=734=static int flexcan_chip_softreset(struct flexcan_priv *priv)\n--\ndrivers/net/can/flexcan/flexcan-core.c-748-\ndrivers/net/can/flexcan/flexcan-core.c:749:static int __flexcan_get_berr_counter(const struct net_device *dev,\ndrivers/net/can/flexcan/flexcan-core.c-750-\t\t\t\t      struct can_berr_counter *bec)\n--\ndrivers/net/can/flexcan/flexcan-core.c-761-\ndrivers/net/can/flexcan/flexcan-core.c:762:static int flexcan_get_berr_counter(const struct net_device *dev,\ndrivers/net/can/flexcan/flexcan-core.c-763-\t\t\t\t    struct can_berr_counter *bec)\n--\ndrivers/net/can/flexcan/flexcan-core.c-774-\ndrivers/net/can/flexcan/flexcan-core.c:775:\terr = __flexcan_get_berr_counter(dev, bec);\ndrivers/net/can/flexcan/flexcan-core.c-776-\n--\ndrivers/net/can/flexcan/flexcan-core.c=896=static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)\n--\ndrivers/net/can/flexcan/flexcan-core.c-915-\t} else {\ndrivers/net/can/flexcan/flexcan-core.c:916:\t\t__flexcan_get_berr_counter(dev, \u0026bec);\ndrivers/net/can/flexcan/flexcan-core.c-917-\t\tnew_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ?\n--\ndrivers/net/can/flexcan/flexcan-core.c=2091=static int flexcan_probe(struct platform_device *pdev)\n--\ndrivers/net/can/flexcan/flexcan-core.c-2205-\tpriv-\u003ecan.do_set_mode = flexcan_set_mode;\ndrivers/net/can/flexcan/flexcan-core.c:2206:\tpriv-\u003ecan.do_get_berr_counter = flexcan_get_berr_counter;\ndrivers/net/can/flexcan/flexcan-core.c-2207-\tpriv-\u003ecan.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |\n"
}

gemini-3.8-flash

null

null

							input: 9914
							output: 44
							thoughts: 91
						

**Reachability and FlexCAN on AMD64**

Okay, let's dive into this reachability question. My primary concern is whether or not we can reliably probe the FlexCAN hardware in a standard virtualized environment. Specifically, I'm thinking about Google Compute Engine (GCE) or QEMU. These are common testing grounds, so being able to confirm FlexCAN's presence there is key.

The immediate focus is the amd64 architecture. Can we get FlexCAN working there? To determine that, I need to check how the system recognizes this. My initial thought is it's a platform device, so I need to check the match table, `flexcan_of_match`. I need to review what "compatible strings" are present in the table. These strings are going to be key to matching the hardware.

{
  "File": "drivers/net/can/flexcan/flexcan-core.c",
  "FirstLine": 2062,
  "LineCount": 25
}

{
  "Contents": "2062:\tstatic const struct of_device_id flexcan_of_match[] = {\n2063:\t\t{ .compatible = \"fsl,imx8qm-flexcan\", .data = \u0026fsl_imx8qm_devtype_data, },\n2064:\t\t{ .compatible = \"fsl,imx8mp-flexcan\", .data = \u0026fsl_imx8mp_devtype_data, },\n2065:\t\t{ .compatible = \"fsl,imx93-flexcan\", .data = \u0026fsl_imx93_devtype_data, },\n2066:\t\t{ .compatible = \"fsl,imx95-flexcan\", .data = \u0026fsl_imx95_devtype_data, },\n2067:\t\t{ .compatible = \"fsl,imx6q-flexcan\", .data = \u0026fsl_imx6q_devtype_data, },\n2068:\t\t{ .compatible = \"fsl,imx28-flexcan\", .data = \u0026fsl_imx28_devtype_data, },\n2069:\t\t{ .compatible = \"fsl,imx53-flexcan\", .data = \u0026fsl_imx25_devtype_data, },\n2070:\t\t{ .compatible = \"fsl,imx35-flexcan\", .data = \u0026fsl_imx25_devtype_data, },\n2071:\t\t{ .compatible = \"fsl,imx25-flexcan\", .data = \u0026fsl_imx25_devtype_data, },\n2072:\t\t{ .compatible = \"fsl,p1010-flexcan\", .data = \u0026fsl_p1010_devtype_data, },\n2073:\t\t{ .compatible = \"fsl,vf610-flexcan\", .data = \u0026fsl_vf610_devtype_data, },\n2074:\t\t{ .compatible = \"fsl,ls1021ar2-flexcan\", .data = \u0026fsl_ls1021a_r2_devtype_data, },\n2075:\t\t{ .compatible = \"fsl,lx2160ar1-flexcan\", .data = \u0026fsl_lx2160a_r1_devtype_data, },\n2076:\t\t{ .compatible = \"nxp,s32g2-flexcan\", .data = \u0026nxp_s32g2_devtype_data, },\n2077:\t\t{ /* sentinel */ },\n2078:\t};\n2079:\tMODULE_DEVICE_TABLE(of, flexcan_of_match);\n2080:\t\n2081:\tstatic const struct platform_device_id flexcan_id_table[] = {\n2082:\t\t{\n2083:\t\t\t.name = \"flexcan-mcf5441x\",\n2084:\t\t\t.driver_data = (kernel_ulong_t)\u0026fsl_mcf5441x_devtype_data,\n2085:\t\t}, {\n2086:\t\t\t/* sentinel */\n"
}

gemini-3.8-flash

null

null

							input: 11011
							output: 23
							thoughts: 272
						

**My Initial Thoughts on FlexCAN**

Okay, so FlexCAN. It's a platform driver, specifically designed for those Freescale/NXP i.MX, QorIQ, and ColdFire SoCs. I've got a decent list of compatible devices here: `fsl,imx8qm-flexcan`, `fsl,imx8mp-flexcan`, all the way down to `flexcan-mcf5441x`. Standard stuff for these embedded systems.

But wait a minute... can this actually probe on an amd64 system, running in something like QEMU or Google Compute Engine? My gut says probably not directly, but it's worth checking. Let's see if there are any virtual devices emulating a FlexCAN interface in those environments. Are there any PCI devices, USB devices, or even platform device instantiation mechanisms that could potentially simulate the FlexCAN behavior?

Specifically, is there a PCI wrapper of some sort that might expose FlexCAN functionality? Time to dig into the kernel source. I'll start with the obvious place, `drivers/net/can/`, but I'll also broaden my search. It would be a useful piece of information to know if there is a wrapper for it in QEMU.

{
  "Expression": "flexcan",
  "PathPrefix": "drivers"
}

{
  "Output": "\nFull output is too long, showing 500 out of 990 lines.\nUse more precise expression if possible.\n\ndrivers/clk/imx/clk-vf610.c=179=static void __init vf610_clocks_init(struct device_node *ccm_node)\n--\ndrivers/clk/imx/clk-vf610.c-429-\ndrivers/clk/imx/clk-vf610.c:430:\tclk[VF610_CLK_FLEXCAN0_EN] = imx_clk_gate(\"flexcan0_en\", \"ipg_bus\", CCM_CSCDR2, 11);\ndrivers/clk/imx/clk-vf610.c:431:\tclk[VF610_CLK_FLEXCAN0] = imx_clk_gate2(\"flexcan0\", \"flexcan0_en\", CCM_CCGR0, CCM_CCGRx_CGn(0));\ndrivers/clk/imx/clk-vf610.c:432:\tclk[VF610_CLK_FLEXCAN1_EN] = imx_clk_gate(\"flexcan1_en\", \"ipg_bus\", CCM_CSCDR2, 12);\ndrivers/clk/imx/clk-vf610.c:433:\tclk[VF610_CLK_FLEXCAN1] = imx_clk_gate2(\"flexcan1\", \"flexcan1_en\", CCM_CCGR9, CCM_CCGRx_CGn(4));\ndrivers/clk/imx/clk-vf610.c-434-\n--\ndrivers/net/can/Makefile=23=obj-$(CONFIG_CAN_CTUCANFD)\t+= ctucanfd/\ndrivers/net/can/Makefile:24:obj-$(CONFIG_CAN_FLEXCAN)\t+= flexcan/\ndrivers/net/can/Makefile-25-obj-$(CONFIG_CAN_GRCAN)\t\t+= grcan.o\n--\ndrivers/net/can/flexcan/Makefile-2-\ndrivers/net/can/flexcan/Makefile:3:obj-$(CONFIG_CAN_FLEXCAN) += flexcan.o\ndrivers/net/can/flexcan/Makefile-4-\ndrivers/net/can/flexcan/Makefile:5:flexcan-objs :=\ndrivers/net/can/flexcan/Makefile:6:flexcan-objs += flexcan-core.o\ndrivers/net/can/flexcan/Makefile:7:flexcan-objs += flexcan-ethtool.o\n--\ndrivers/net/can/flexcan/flexcan-core.c-2-//\ndrivers/net/can/flexcan/flexcan-core.c:3:// flexcan.c - FLEXCAN CAN controller driver\ndrivers/net/can/flexcan/flexcan-core.c-4-//\n--\ndrivers/net/can/flexcan/flexcan-core.c-27-#include \u003clinux/platform_device.h\u003e\ndrivers/net/can/flexcan/flexcan-core.c:28:#include \u003clinux/can/platform/flexcan.h\u003e\ndrivers/net/can/flexcan/flexcan-core.c-29-#include \u003clinux/phy/phy.h\u003e\n--\ndrivers/net/can/flexcan/flexcan-core.c-34-\ndrivers/net/can/flexcan/flexcan-core.c:35:#include \"flexcan.h\"\ndrivers/net/can/flexcan/flexcan-core.c-36-\ndrivers/net/can/flexcan/flexcan-core.c:37:#define DRV_NAME\t\t\t\"flexcan\"\ndrivers/net/can/flexcan/flexcan-core.c-38-\n--\ndrivers/net/can/flexcan/flexcan-core.c-210-/* Structure of the message buffer */\ndrivers/net/can/flexcan/flexcan-core.c:211:struct flexcan_mb {\ndrivers/net/can/flexcan/flexcan-core.c-212-\tu32 can_ctrl;\n--\ndrivers/net/can/flexcan/flexcan-core.c-217-/* Structure of the hardware registers */\ndrivers/net/can/flexcan/flexcan-core.c:218:struct flexcan_regs {\ndrivers/net/can/flexcan/flexcan-core.c-219-\tu32 mcr;\t\t/* 0x00 */\n--\ndrivers/net/can/flexcan/flexcan-core.c-293-\ndrivers/net/can/flexcan/flexcan-core.c:294:static_assert(sizeof(struct flexcan_regs) ==  0x4 * 18 + 0xfb8);\ndrivers/net/can/flexcan/flexcan-core.c-295-\ndrivers/net/can/flexcan/flexcan-core.c:296:static const struct flexcan_devtype_data fsl_mcf5441x_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-297-\t.quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE |\n--\ndrivers/net/can/flexcan/flexcan-core.c-302-\ndrivers/net/can/flexcan/flexcan-core.c:303:static const struct flexcan_devtype_data fsl_p1010_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-304-\t.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |\n--\ndrivers/net/can/flexcan/flexcan-core.c-310-\ndrivers/net/can/flexcan/flexcan-core.c:311:static const struct flexcan_devtype_data fsl_imx25_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-312-\t.quirks = FLEXCAN_QUIRK_BROKEN_WERR_STATE |\n--\ndrivers/net/can/flexcan/flexcan-core.c-317-\ndrivers/net/can/flexcan/flexcan-core.c:318:static const struct flexcan_devtype_data fsl_imx28_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-319-\t.quirks = FLEXCAN_QUIRK_BROKEN_PERR_STATE |\n--\ndrivers/net/can/flexcan/flexcan-core.c-323-\ndrivers/net/can/flexcan/flexcan-core.c:324:static const struct flexcan_devtype_data fsl_imx6q_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-325-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-331-\ndrivers/net/can/flexcan/flexcan-core.c:332:static const struct flexcan_devtype_data fsl_imx8qm_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-333-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-339-\ndrivers/net/can/flexcan/flexcan-core.c:340:static struct flexcan_devtype_data fsl_imx8mp_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-341-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-348-\ndrivers/net/can/flexcan/flexcan-core.c:349:static struct flexcan_devtype_data fsl_imx93_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-350-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-357-\ndrivers/net/can/flexcan/flexcan-core.c:358:static const struct flexcan_devtype_data fsl_imx95_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-359-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-365-\ndrivers/net/can/flexcan/flexcan-core.c:366:static const struct flexcan_devtype_data fsl_vf610_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-367-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-373-\ndrivers/net/can/flexcan/flexcan-core.c:374:static const struct flexcan_devtype_data fsl_ls1021a_r2_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-375-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-380-\ndrivers/net/can/flexcan/flexcan-core.c:381:static const struct flexcan_devtype_data fsl_lx2160a_r1_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-382-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-389-\ndrivers/net/can/flexcan/flexcan-core.c:390:static const struct flexcan_devtype_data nxp_s32g2_devtype_data = {\ndrivers/net/can/flexcan/flexcan-core.c-391-\t.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |\n--\ndrivers/net/can/flexcan/flexcan-core.c-399-\ndrivers/net/can/flexcan/flexcan-core.c:400:static const struct can_bittiming_const flexcan_bittiming_const = {\ndrivers/net/can/flexcan/flexcan-core.c-401-\t.name = DRV_NAME,\n--\ndrivers/net/can/flexcan/flexcan-core.c-411-\ndrivers/net/can/flexcan/flexcan-core.c:412:static const struct can_bittiming_const flexcan_fd_bittiming_const = {\ndrivers/net/can/flexcan/flexcan-core.c-413-\t.name = DRV_NAME,\n--\ndrivers/net/can/flexcan/flexcan-core.c-423-\ndrivers/net/can/flexcan/flexcan-core.c:424:static const struct can_bittiming_const flexcan_fd_data_bittiming_const = {\ndrivers/net/can/flexcan/flexcan-core.c-425-\t.name = DRV_NAME,\n--\ndrivers/net/can/flexcan/flexcan-core.c-448- */\ndrivers/net/can/flexcan/flexcan-core.c:449:static inline u32 flexcan_read_be(void __iomem *addr)\ndrivers/net/can/flexcan/flexcan-core.c-450-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-453-\ndrivers/net/can/flexcan/flexcan-core.c:454:static inline void flexcan_write_be(u32 val, void __iomem *addr)\ndrivers/net/can/flexcan/flexcan-core.c-455-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-458-\ndrivers/net/can/flexcan/flexcan-core.c:459:static inline u32 flexcan_read_le(void __iomem *addr)\ndrivers/net/can/flexcan/flexcan-core.c-460-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-463-\ndrivers/net/can/flexcan/flexcan-core.c:464:static inline void flexcan_write_le(u32 val, void __iomem *addr)\ndrivers/net/can/flexcan/flexcan-core.c-465-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-468-\ndrivers/net/can/flexcan/flexcan-core.c:469:static struct flexcan_mb __iomem *flexcan_get_mb(const struct flexcan_priv *priv,\ndrivers/net/can/flexcan/flexcan-core.c-470-\t\t\t\t\t\t u8 mb_index)\n--\ndrivers/net/can/flexcan/flexcan-core.c-483-\ndrivers/net/can/flexcan/flexcan-core.c:484:\treturn (struct flexcan_mb __iomem *)\ndrivers/net/can/flexcan/flexcan-core.c-485-\t\t(\u0026priv-\u003eregs-\u003emb[bank][priv-\u003emb_size * mb_index]);\n--\ndrivers/net/can/flexcan/flexcan-core.c-487-\ndrivers/net/can/flexcan/flexcan-core.c:488:static int flexcan_low_power_enter_ack(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-489-{\ndrivers/net/can/flexcan/flexcan-core.c:490:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-491-\tunsigned int timeout = FLEXCAN_TIMEOUT_US / 10;\n--\ndrivers/net/can/flexcan/flexcan-core.c-501-\ndrivers/net/can/flexcan/flexcan-core.c:502:static int flexcan_low_power_exit_ack(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-503-{\ndrivers/net/can/flexcan/flexcan-core.c:504:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-505-\tunsigned int timeout = FLEXCAN_TIMEOUT_US / 10;\n--\ndrivers/net/can/flexcan/flexcan-core.c-515-\ndrivers/net/can/flexcan/flexcan-core.c:516:static void flexcan_enable_wakeup_irq(struct flexcan_priv *priv, bool enable)\ndrivers/net/can/flexcan/flexcan-core.c-517-{\ndrivers/net/can/flexcan/flexcan-core.c:518:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-519-\tu32 reg_mcr;\n--\ndrivers/net/can/flexcan/flexcan-core.c-530-\ndrivers/net/can/flexcan/flexcan-core.c:531:static int flexcan_stop_mode_enable_scfw(struct flexcan_priv *priv, bool enabled)\ndrivers/net/can/flexcan/flexcan-core.c-532-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-547-\ndrivers/net/can/flexcan/flexcan-core.c:548:static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-549-{\ndrivers/net/can/flexcan/flexcan-core.c:550:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-551-\tu32 reg_mcr;\n--\ndrivers/net/can/flexcan/flexcan-core.c-559-\tif (priv-\u003edevtype_data.quirks \u0026 FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW) {\ndrivers/net/can/flexcan/flexcan-core.c:560:\t\tret = flexcan_stop_mode_enable_scfw(priv, true);\ndrivers/net/can/flexcan/flexcan-core.c-561-\t\tif (ret \u003c 0)\n--\ndrivers/net/can/flexcan/flexcan-core.c-574-\ndrivers/net/can/flexcan/flexcan-core.c:575:\treturn flexcan_low_power_enter_ack(priv);\ndrivers/net/can/flexcan/flexcan-core.c-576-}\ndrivers/net/can/flexcan/flexcan-core.c-577-\ndrivers/net/can/flexcan/flexcan-core.c:578:static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-579-{\ndrivers/net/can/flexcan/flexcan-core.c:580:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-581-\tu32 reg_mcr;\n--\ndrivers/net/can/flexcan/flexcan-core.c-589-\tif (priv-\u003edevtype_data.quirks \u0026 FLEXCAN_QUIRK_SETUP_STOP_MODE_SCFW) {\ndrivers/net/can/flexcan/flexcan-core.c:590:\t\tret = flexcan_stop_mode_enable_scfw(priv, false);\ndrivers/net/can/flexcan/flexcan-core.c-591-\t\tif (ret \u003c 0)\n--\ndrivers/net/can/flexcan/flexcan-core.c-601-\ndrivers/net/can/flexcan/flexcan-core.c:602:\treturn flexcan_low_power_exit_ack(priv);\ndrivers/net/can/flexcan/flexcan-core.c-603-}\ndrivers/net/can/flexcan/flexcan-core.c-604-\ndrivers/net/can/flexcan/flexcan-core.c:605:static inline void flexcan_error_irq_enable(const struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-606-{\ndrivers/net/can/flexcan/flexcan-core.c:607:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-608-\tu32 reg_ctrl = (priv-\u003ereg_ctrl_default | FLEXCAN_CTRL_ERR_MSK);\n--\ndrivers/net/can/flexcan/flexcan-core.c-612-\ndrivers/net/can/flexcan/flexcan-core.c:613:static inline void flexcan_error_irq_disable(const struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-614-{\ndrivers/net/can/flexcan/flexcan-core.c:615:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-616-\tu32 reg_ctrl = (priv-\u003ereg_ctrl_default \u0026 ~FLEXCAN_CTRL_ERR_MSK);\n--\ndrivers/net/can/flexcan/flexcan-core.c-620-\ndrivers/net/can/flexcan/flexcan-core.c:621:static int flexcan_clks_enable(const struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-622-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-639-\ndrivers/net/can/flexcan/flexcan-core.c:640:static void flexcan_clks_disable(const struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-641-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-645-\ndrivers/net/can/flexcan/flexcan-core.c:646:static inline int flexcan_transceiver_enable(const struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-647-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-655-\ndrivers/net/can/flexcan/flexcan-core.c:656:static inline int flexcan_transceiver_disable(const struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-657-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-665-\ndrivers/net/can/flexcan/flexcan-core.c:666:static int flexcan_chip_enable(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-667-{\ndrivers/net/can/flexcan/flexcan-core.c:668:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-669-\tu32 reg;\n--\ndrivers/net/can/flexcan/flexcan-core.c-674-\ndrivers/net/can/flexcan/flexcan-core.c:675:\treturn flexcan_low_power_exit_ack(priv);\ndrivers/net/can/flexcan/flexcan-core.c-676-}\ndrivers/net/can/flexcan/flexcan-core.c-677-\ndrivers/net/can/flexcan/flexcan-core.c:678:static int flexcan_chip_disable(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-679-{\ndrivers/net/can/flexcan/flexcan-core.c:680:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-681-\tu32 reg;\n--\ndrivers/net/can/flexcan/flexcan-core.c-686-\ndrivers/net/can/flexcan/flexcan-core.c:687:\treturn flexcan_low_power_enter_ack(priv);\ndrivers/net/can/flexcan/flexcan-core.c-688-}\ndrivers/net/can/flexcan/flexcan-core.c-689-\ndrivers/net/can/flexcan/flexcan-core.c:690:static int flexcan_chip_freeze(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-691-{\ndrivers/net/can/flexcan/flexcan-core.c:692:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-693-\tunsigned int timeout;\n--\ndrivers/net/can/flexcan/flexcan-core.c-714-\ndrivers/net/can/flexcan/flexcan-core.c:715:static int flexcan_chip_unfreeze(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-716-{\ndrivers/net/can/flexcan/flexcan-core.c:717:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-718-\tunsigned int timeout = FLEXCAN_TIMEOUT_US / 10;\n--\ndrivers/net/can/flexcan/flexcan-core.c-733-\ndrivers/net/can/flexcan/flexcan-core.c:734:static int flexcan_chip_softreset(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-735-{\ndrivers/net/can/flexcan/flexcan-core.c:736:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-737-\tunsigned int timeout = FLEXCAN_TIMEOUT_US / 10;\n--\ndrivers/net/can/flexcan/flexcan-core.c-748-\ndrivers/net/can/flexcan/flexcan-core.c:749:static int __flexcan_get_berr_counter(const struct net_device *dev,\ndrivers/net/can/flexcan/flexcan-core.c-750-\t\t\t\t      struct can_berr_counter *bec)\ndrivers/net/can/flexcan/flexcan-core.c-751-{\ndrivers/net/can/flexcan/flexcan-core.c:752:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:753:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-754-\tu32 reg = priv-\u003eread(\u0026regs-\u003eecr);\n--\ndrivers/net/can/flexcan/flexcan-core.c-761-\ndrivers/net/can/flexcan/flexcan-core.c:762:static int flexcan_get_berr_counter(const struct net_device *dev,\ndrivers/net/can/flexcan/flexcan-core.c-763-\t\t\t\t    struct can_berr_counter *bec)\ndrivers/net/can/flexcan/flexcan-core.c-764-{\ndrivers/net/can/flexcan/flexcan-core.c:765:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c-766-\tint err;\n--\ndrivers/net/can/flexcan/flexcan-core.c-774-\ndrivers/net/can/flexcan/flexcan-core.c:775:\terr = __flexcan_get_berr_counter(dev, bec);\ndrivers/net/can/flexcan/flexcan-core.c-776-\n--\ndrivers/net/can/flexcan/flexcan-core.c-781-\ndrivers/net/can/flexcan/flexcan-core.c:782:static netdev_tx_t flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-783-{\ndrivers/net/can/flexcan/flexcan-core.c:784:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c-785-\tstruct canfd_frame *cfd = (struct canfd_frame *)skb-\u003edata;\n--\ndrivers/net/can/flexcan/flexcan-core.c-833-\ndrivers/net/can/flexcan/flexcan-core.c:834:static void flexcan_irq_bus_err(struct net_device *dev, u32 reg_esr)\ndrivers/net/can/flexcan/flexcan-core.c-835-{\ndrivers/net/can/flexcan/flexcan-core.c:836:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:837:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-838-\tstruct sk_buff *skb;\n--\ndrivers/net/can/flexcan/flexcan-core.c-895-\ndrivers/net/can/flexcan/flexcan-core.c:896:static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)\ndrivers/net/can/flexcan/flexcan-core.c-897-{\ndrivers/net/can/flexcan/flexcan-core.c:898:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:899:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-900-\tstruct sk_buff *skb;\n--\ndrivers/net/can/flexcan/flexcan-core.c-915-\t} else {\ndrivers/net/can/flexcan/flexcan-core.c:916:\t\t__flexcan_get_berr_counter(dev, \u0026bec);\ndrivers/net/can/flexcan/flexcan-core.c-917-\t\tnew_state = flt == FLEXCAN_ESR_FLT_CONF_PASSIVE ?\n--\ndrivers/net/can/flexcan/flexcan-core.c-942-\ndrivers/net/can/flexcan/flexcan-core.c:943:static inline u64 flexcan_read64_mask(struct flexcan_priv *priv, void __iomem *addr, u64 mask)\ndrivers/net/can/flexcan/flexcan-core.c-944-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-954-\ndrivers/net/can/flexcan/flexcan-core.c:955:static inline void flexcan_write64(struct flexcan_priv *priv, u64 val, void __iomem *addr)\ndrivers/net/can/flexcan/flexcan-core.c-956-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-962-\ndrivers/net/can/flexcan/flexcan-core.c:963:static inline u64 flexcan_read_reg_iflag_rx(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-964-{\ndrivers/net/can/flexcan/flexcan-core.c:965:\treturn flexcan_read64_mask(priv, \u0026priv-\u003eregs-\u003eiflag1, priv-\u003erx_mask);\ndrivers/net/can/flexcan/flexcan-core.c-966-}\ndrivers/net/can/flexcan/flexcan-core.c-967-\ndrivers/net/can/flexcan/flexcan-core.c:968:static inline u64 flexcan_read_reg_iflag_tx(struct flexcan_priv *priv)\ndrivers/net/can/flexcan/flexcan-core.c-969-{\ndrivers/net/can/flexcan/flexcan-core.c:970:\treturn flexcan_read64_mask(priv, \u0026priv-\u003eregs-\u003eiflag1, priv-\u003etx_mask);\ndrivers/net/can/flexcan/flexcan-core.c-971-}\ndrivers/net/can/flexcan/flexcan-core.c-972-\ndrivers/net/can/flexcan/flexcan-core.c:973:static inline struct flexcan_priv *rx_offload_to_priv(struct can_rx_offload *offload)\ndrivers/net/can/flexcan/flexcan-core.c-974-{\ndrivers/net/can/flexcan/flexcan-core.c:975:\treturn container_of(offload, struct flexcan_priv, offload);\ndrivers/net/can/flexcan/flexcan-core.c-976-}\ndrivers/net/can/flexcan/flexcan-core.c-977-\ndrivers/net/can/flexcan/flexcan-core.c:978:static struct sk_buff *flexcan_mailbox_read(struct can_rx_offload *offload,\ndrivers/net/can/flexcan/flexcan-core.c-979-\t\t\t\t\t    unsigned int n, u32 *timestamp,\n--\ndrivers/net/can/flexcan/flexcan-core.c-981-{\ndrivers/net/can/flexcan/flexcan-core.c:982:\tstruct flexcan_priv *priv = rx_offload_to_priv(offload);\ndrivers/net/can/flexcan/flexcan-core.c:983:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c:984:\tstruct flexcan_mb __iomem *mb;\ndrivers/net/can/flexcan/flexcan-core.c-985-\tstruct sk_buff *skb;\n--\ndrivers/net/can/flexcan/flexcan-core.c-989-\ndrivers/net/can/flexcan/flexcan-core.c:990:\tmb = flexcan_get_mb(priv, n);\ndrivers/net/can/flexcan/flexcan-core.c-991-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1062-\tif (priv-\u003edevtype_data.quirks \u0026 FLEXCAN_QUIRK_USE_RX_MAILBOX)\ndrivers/net/can/flexcan/flexcan-core.c:1063:\t\tflexcan_write64(priv, FLEXCAN_IFLAG_MB(n), \u0026regs-\u003eiflag1);\ndrivers/net/can/flexcan/flexcan-core.c-1064-\telse\n--\ndrivers/net/can/flexcan/flexcan-core.c-1075-\ndrivers/net/can/flexcan/flexcan-core.c:1076:static irqreturn_t flexcan_irq(int irq, void *dev_id)\ndrivers/net/can/flexcan/flexcan-core.c-1077-{\n--\ndrivers/net/can/flexcan/flexcan-core.c-1079-\tstruct net_device_stats *stats = \u0026dev-\u003estats;\ndrivers/net/can/flexcan/flexcan-core.c:1080:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:1081:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1082-\tirqreturn_t handled = IRQ_NONE;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1091-\ndrivers/net/can/flexcan/flexcan-core.c:1092:\t\twhile ((reg_iflag_rx = flexcan_read_reg_iflag_rx(priv))) {\ndrivers/net/can/flexcan/flexcan-core.c-1093-\t\t\thandled = IRQ_HANDLED;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1117-\ndrivers/net/can/flexcan/flexcan-core.c:1118:\treg_iflag_tx = flexcan_read_reg_iflag_tx(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1119-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1132-\t\t\t    \u0026priv-\u003etx_mb-\u003ecan_ctrl);\ndrivers/net/can/flexcan/flexcan-core.c:1133:\t\tflexcan_write64(priv, priv-\u003etx_mask, \u0026regs-\u003eiflag1);\ndrivers/net/can/flexcan/flexcan-core.c-1134-\t\tnetif_wake_queue(dev);\n--\ndrivers/net/can/flexcan/flexcan-core.c-1148-\t\t\t\t\t   FLEXCAN_QUIRK_BROKEN_PERR_STATE)))\ndrivers/net/can/flexcan/flexcan-core.c:1149:\t\tflexcan_irq_state(dev, reg_esr);\ndrivers/net/can/flexcan/flexcan-core.c-1150-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1153-\t    (priv-\u003ecan.ctrlmode \u0026 CAN_CTRLMODE_BERR_REPORTING))\ndrivers/net/can/flexcan/flexcan-core.c:1154:\t\tflexcan_irq_bus_err(dev, reg_esr);\ndrivers/net/can/flexcan/flexcan-core.c-1155-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1174-\t\t\t    FLEXCAN_QUIRK_BROKEN_WERR_STATE)\ndrivers/net/can/flexcan/flexcan-core.c:1175:\t\t\t\tflexcan_error_irq_enable(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1176-\t\t\telse\ndrivers/net/can/flexcan/flexcan-core.c:1177:\t\t\t\tflexcan_error_irq_disable(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1178-\t\t\tbreak;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1180-\t\tcase CAN_STATE_ERROR_WARNING:\ndrivers/net/can/flexcan/flexcan-core.c:1181:\t\t\tflexcan_error_irq_enable(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1182-\t\t\tbreak;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1185-\t\tcase CAN_STATE_BUS_OFF:\ndrivers/net/can/flexcan/flexcan-core.c:1186:\t\t\tflexcan_error_irq_disable(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1187-\t\t\tbreak;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1199-\ndrivers/net/can/flexcan/flexcan-core.c:1200:static void flexcan_set_bittiming_ctrl(const struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1201-{\ndrivers/net/can/flexcan/flexcan-core.c:1202:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1203-\tconst struct can_bittiming *bt = \u0026priv-\u003ecan.bittiming;\ndrivers/net/can/flexcan/flexcan-core.c:1204:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1205-\tu32 reg;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1227-\ndrivers/net/can/flexcan/flexcan-core.c:1228:static void flexcan_set_bittiming_cbt(const struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1229-{\ndrivers/net/can/flexcan/flexcan-core.c:1230:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1231-\tstruct can_bittiming *bt = \u0026priv-\u003ecan.bittiming;\ndrivers/net/can/flexcan/flexcan-core.c-1232-\tstruct can_bittiming *dbt = \u0026priv-\u003ecan.fd.data_bittiming;\ndrivers/net/can/flexcan/flexcan-core.c:1233:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1234-\tu32 reg_cbt, reg_fdctrl;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1333-\ndrivers/net/can/flexcan/flexcan-core.c:1334:static void flexcan_set_bittiming(struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1335-{\ndrivers/net/can/flexcan/flexcan-core.c:1336:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:1337:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1338-\tu32 reg;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1354-\tif (priv-\u003ecan.ctrlmode_supported \u0026 CAN_CTRLMODE_FD)\ndrivers/net/can/flexcan/flexcan-core.c:1355:\t\treturn flexcan_set_bittiming_cbt(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1356-\telse\ndrivers/net/can/flexcan/flexcan-core.c:1357:\t\treturn flexcan_set_bittiming_ctrl(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1358-}\ndrivers/net/can/flexcan/flexcan-core.c-1359-\ndrivers/net/can/flexcan/flexcan-core.c:1360:static void flexcan_ram_init(struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1361-{\ndrivers/net/can/flexcan/flexcan-core.c:1362:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:1363:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1364-\tu32 reg_ctrl2;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1386-\ndrivers/net/can/flexcan/flexcan-core.c:1387:static int flexcan_rx_offload_setup(struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1388-{\ndrivers/net/can/flexcan/flexcan-core.c:1389:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1390-\tint err;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1392-\tif (priv-\u003ecan.ctrlmode \u0026 CAN_CTRLMODE_FD)\ndrivers/net/can/flexcan/flexcan-core.c:1393:\t\tpriv-\u003emb_size = sizeof(struct flexcan_mb) + CANFD_MAX_DLEN;\ndrivers/net/can/flexcan/flexcan-core.c-1394-\telse\ndrivers/net/can/flexcan/flexcan-core.c:1395:\t\tpriv-\u003emb_size = sizeof(struct flexcan_mb) + CAN_MAX_DLEN;\ndrivers/net/can/flexcan/flexcan-core.c-1396-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1404-\t\tpriv-\u003etx_mb_reserved =\ndrivers/net/can/flexcan/flexcan-core.c:1405:\t\t\tflexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_RX_MAILBOX);\ndrivers/net/can/flexcan/flexcan-core.c-1406-\telse\ndrivers/net/can/flexcan/flexcan-core.c-1407-\t\tpriv-\u003etx_mb_reserved =\ndrivers/net/can/flexcan/flexcan-core.c:1408:\t\t\tflexcan_get_mb(priv, FLEXCAN_TX_MB_RESERVED_RX_FIFO);\ndrivers/net/can/flexcan/flexcan-core.c-1409-\tpriv-\u003etx_mb_idx = priv-\u003emb_count - 1;\ndrivers/net/can/flexcan/flexcan-core.c:1410:\tpriv-\u003etx_mb = flexcan_get_mb(priv, priv-\u003etx_mb_idx);\ndrivers/net/can/flexcan/flexcan-core.c-1411-\tpriv-\u003etx_mask = FLEXCAN_IFLAG_MB(priv-\u003etx_mb_idx);\ndrivers/net/can/flexcan/flexcan-core.c-1412-\ndrivers/net/can/flexcan/flexcan-core.c:1413:\tpriv-\u003eoffload.mailbox_read = flexcan_mailbox_read;\ndrivers/net/can/flexcan/flexcan-core.c-1414-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1431-\ndrivers/net/can/flexcan/flexcan-core.c:1432:static void flexcan_chip_interrupts_enable(const struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1433-{\ndrivers/net/can/flexcan/flexcan-core.c:1434:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:1435:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1436-\tu64 reg_imask;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1445-\ndrivers/net/can/flexcan/flexcan-core.c:1446:static void flexcan_chip_interrupts_disable(const struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1447-{\ndrivers/net/can/flexcan/flexcan-core.c:1448:\tconst struct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:1449:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1450-\n--\ndrivers/net/can/flexcan/flexcan-core.c-1456-\ndrivers/net/can/flexcan/flexcan-core.c:1457:/* flexcan_chip_start\ndrivers/net/can/flexcan/flexcan-core.c-1458- *\n--\ndrivers/net/can/flexcan/flexcan-core.c-1461- */\ndrivers/net/can/flexcan/flexcan-core.c:1462:static int flexcan_chip_start(struct net_device *dev)\ndrivers/net/can/flexcan/flexcan-core.c-1463-{\ndrivers/net/can/flexcan/flexcan-core.c:1464:\tstruct flexcan_priv *priv = netdev_priv(dev);\ndrivers/net/can/flexcan/flexcan-core.c:1465:\tstruct flexcan_regs __iomem *regs = priv-\u003eregs;\ndrivers/net/can/flexcan/flexcan-core.c-1466-\tu32 reg_mcr, reg_ctrl, reg_ctrl2, reg_mecr;\ndrivers/net/can/flexcan/flexcan-core.c-1467-\tint err, i;\ndrivers/net/can/flexcan/flexcan-core.c:1468:\tstruct flexcan_mb __iomem *mb;\ndrivers/net/can/flexcan/flexcan-core.c-1469-\ndrivers/net/can/flexcan/flexcan-core.c-1470-\t/* enable module */\ndrivers/net/can/flexcan/flexcan-core.c:1471:\terr = flexcan_chip_enable(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1472-\tif (err)\n--\ndrivers/net/can/flexcan/flexcan-core.c-1475-\t/* soft reset */\ndrivers/net/can/flexcan/flexcan-core.c:1476:\terr = flexcan_chip_softreset(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1477-\tif (err)\n--\ndrivers/net/can/flexcan/flexcan-core.c-1480-\tif (priv-\u003edevtype_data.quirks \u0026 FLEXCAN_QUIRK_SUPPORT_ECC)\ndrivers/net/can/flexcan/flexcan-core.c:1481:\t\tflexcan_ram_init(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1482-\ndrivers/net/can/flexcan/flexcan-core.c:1483:\tflexcan_set_bittiming(dev);\ndrivers/net/can/flexcan/flexcan-core.c-1484-\ndrivers/net/can/flexcan/flexcan-core.c-1485-\t/* set freeze, halt */\ndrivers/net/can/flexcan/flexcan-core.c:1486:\terr = flexcan_chip_freeze(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1487-\tif (err)\n--\ndrivers/net/can/flexcan/flexcan-core.c-1518-\t *       of a transmitted message. This is not documented in\ndrivers/net/can/flexcan/flexcan-core.c:1519:\t *       earlier versions of flexcan block guide.\ndrivers/net/can/flexcan/flexcan-core.c-1520-\t *\n--\ndrivers/net/can/flexcan/flexcan-core.c-1606-\t\tfor (i = priv-\u003eoffload.mb_first; i \u003c= priv-\u003eoffload.mb_last; i++) {\ndrivers/net/can/flexcan/flexcan-core.c:1607:\t\t\tmb = flexcan_get_mb(priv, i);\ndrivers/net/can/flexcan/flexcan-core.c-1608-\t\t\tpriv-\u003ewrite(FLEXCAN_MB_CODE_RX_EMPTY,\n--\ndrivers/net/can/flexcan/flexcan-core.c-1613-\t\tfor (i = FLEXCAN_TX_MB_RESERVED_RX_FIFO; i \u003c priv-\u003emb_count; i++) {\ndrivers/net/can/flexcan/flexcan-core.c:1614:\t\t\tmb = flexcan_get_mb(priv, i);\ndrivers/net/can/flexcan/flexcan-core.c-1615-\t\t\tpriv-\u003ewrite(FLEXCAN_MB_CODE_RX_INACTIVE,\n--\ndrivers/net/can/flexcan/flexcan-core.c-1679-\t/* synchronize with the can bus */\ndrivers/net/can/flexcan/flexcan-core.c:1680:\terr = flexcan_chip_unfreeze(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1681-\tif (err)\n--\ndrivers/net/can/flexcan/flexcan-core.c-1692- out_chip_disable:\ndrivers/net/can/flexcan/flexcan-core.c:1693:\tflexcan_chip_disable(priv);\ndrivers/net/can/flexcan/flexcan-core.c-1694-\treturn err;\n--\ndrivers/net/can/flexcan/flexcan-core.c-1696-\ndrivers/net/can/flexcan/flexcan-core.c:1697:/* __flexcan_chip_stop\ndrivers/net/can/flexcan/flexcan-core.c-1698- *\n--\ndrivers/net/can/flexcan/flexcan-core.c-1700- */\n\n"
}

gemini-3.8-flash

null

null

							input: 24996
							output: 44
							thoughts: 165
						

**FlexCAN Driver Probe Investigation**

Okay, so I'm trying to figure out if I can probe the flexcan driver in a standard QEMU setup or even on Google Compute Engine (GCE) on amd64. A quick thought: Does QEMU even *emulate* FlexCAN? I need to check.

Alright, a quick QEMU reference reveals it doesn't. It offers kvaser_pci, mioe3680_pci, pcm3680_pci – all SJA1000 PCI CAN controllers – and can_host_socketcan, but no FlexCAN. Hmm... wait, is there some x86 specific magic in QEMU that would let me emulate a flexcan? No, that's not right. FlexCAN is an NXP/Freescale SoC peripheral, intended for imx25/imx6/imx8/s32g/etc. type systems.

So, if I can't emulate FlexCAN, can I at least instantiate it dynamically, somehow? Let's delve into `flexcan_probe`. What are its requirements? I need to see what I have to satisfy in order to even trigger it.

{
  "File": "drivers/net/can/flexcan/flexcan-core.c",
  "FirstLine": 2090,
  "LineCount": 80
}

{
  "Contents": "2090:\t\n2091:\tstatic int flexcan_probe(struct platform_device *pdev)\n2092:\t{\n2093:\t\tconst struct flexcan_devtype_data *devtype_data;\n2094:\t\tstruct net_device *dev;\n2095:\t\tstruct flexcan_priv *priv;\n2096:\t\tstruct regulator *reg_xceiver;\n2097:\t\tstruct phy *transceiver;\n2098:\t\tstruct clk *clk_ipg = NULL, *clk_per = NULL;\n2099:\t\tstruct flexcan_regs __iomem *regs;\n2100:\t\tstruct flexcan_platform_data *pdata;\n2101:\t\tint err, irq;\n2102:\t\tu8 clk_src = 1;\n2103:\t\tu32 clock_freq = 0;\n2104:\t\n2105:\t\treg_xceiver = devm_regulator_get_optional(\u0026pdev-\u003edev, \"xceiver\");\n2106:\t\tif (PTR_ERR(reg_xceiver) == -EPROBE_DEFER)\n2107:\t\t\treturn -EPROBE_DEFER;\n2108:\t\telse if (PTR_ERR(reg_xceiver) == -ENODEV)\n2109:\t\t\treg_xceiver = NULL;\n2110:\t\telse if (IS_ERR(reg_xceiver))\n2111:\t\t\treturn PTR_ERR(reg_xceiver);\n2112:\t\n2113:\t\ttransceiver = devm_phy_optional_get(\u0026pdev-\u003edev, NULL);\n2114:\t\tif (IS_ERR(transceiver))\n2115:\t\t\treturn dev_err_probe(\u0026pdev-\u003edev, PTR_ERR(transceiver),\n2116:\t\t\t\t\t     \"failed to get phy\\n\");\n2117:\t\n2118:\t\tif (pdev-\u003edev.of_node) {\n2119:\t\t\tof_property_read_u32(pdev-\u003edev.of_node,\n2120:\t\t\t\t\t     \"clock-frequency\", \u0026clock_freq);\n2121:\t\t\tof_property_read_u8(pdev-\u003edev.of_node,\n2122:\t\t\t\t\t    \"fsl,clk-source\", \u0026clk_src);\n2123:\t\t} else {\n2124:\t\t\tpdata = dev_get_platdata(\u0026pdev-\u003edev);\n2125:\t\t\tif (pdata) {\n2126:\t\t\t\tclock_freq = pdata-\u003eclock_frequency;\n2127:\t\t\t\tclk_src = pdata-\u003eclk_src;\n2128:\t\t\t}\n2129:\t\t}\n2130:\t\n2131:\t\tif (!clock_freq) {\n2132:\t\t\tclk_ipg = devm_clk_get(\u0026pdev-\u003edev, \"ipg\");\n2133:\t\t\tif (IS_ERR(clk_ipg)) {\n2134:\t\t\t\tdev_err(\u0026pdev-\u003edev, \"no ipg clock defined\\n\");\n2135:\t\t\t\treturn PTR_ERR(clk_ipg);\n2136:\t\t\t}\n2137:\t\n2138:\t\t\tclk_per = devm_clk_get(\u0026pdev-\u003edev, \"per\");\n2139:\t\t\tif (IS_ERR(clk_per)) {\n2140:\t\t\t\tdev_err(\u0026pdev-\u003edev, \"no per clock defined\\n\");\n2141:\t\t\t\treturn PTR_ERR(clk_per);\n2142:\t\t\t}\n2143:\t\t\tclock_freq = clk_get_rate(clk_per);\n2144:\t\t}\n2145:\t\n2146:\t\tirq = platform_get_irq(pdev, 0);\n2147:\t\tif (irq \u003c 0)\n2148:\t\t\treturn irq;\n2149:\t\n2150:\t\tregs = devm_platform_ioremap_resource(pdev, 0);\n2151:\t\tif (IS_ERR(regs))\n2152:\t\t\treturn PTR_ERR(regs);\n2153:\t\n2154:\t\tdevtype_data = device_get_match_data(\u0026pdev-\u003edev);\n2155:\t\n2156:\t\tif ((devtype_data-\u003equirks \u0026 FLEXCAN_QUIRK_SUPPORT_FD) \u0026\u0026\n2157:\t\t    !((devtype_data-\u003equirks \u0026\n2158:\t\t       (FLEXCAN_QUIRK_USE_RX_MAILBOX |\n2159:\t\t\tFLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |\n2160:\t\t\tFLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR |\n2161:\t\t\tFLEXCAN_QUIRK_SUPPORT_RX_FIFO)) ==\n2162:\t\t      (FLEXCAN_QUIRK_USE_RX_MAILBOX |\n2163:\t\t       FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |\n2164:\t\t       FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR))) {\n2165:\t\t\tdev_err(\u0026pdev-\u003edev, \"CAN-FD mode doesn't work in RX-FIFO mode!\\n\");\n2166:\t\t\treturn -EINVAL;\n2167:\t\t}\n2168:\t\n2169:\t\tif ((devtype_data-\u003equirks \u0026\n"
}

gemini-3.8-flash

null

null

							input: 26860
							output: 23
							thoughts: 439
						

**My Assessment of the FlexCAN Driver and Syzkaller's Testing Capabilities**

Okay, so I'm looking at the `flexcan` driver, and it's flagged as a platform driver. That immediately tells me it needs specific platform-level resources. I see it's using `devm_platform_ioremap_resource`, `platform_get_irq`, and `device_get_match_data`. That means it's expecting a Device Tree (`of_node`) or platform data, along with an I/O memory resource and an interrupt.

The problem hits me hard when I consider an x86/amd64 virtualized environment like GCE or QEMU. These don't typically have the Device Tree configurations that are standard for those Freescale i.MX or QorIQ systems. That immediately introduces a huge hurdle.

Wait, could syzkaller somehow instantiate this through sysfs or configfs? No, that's not feasible. Standard platform devices can't be probed from userspace without device tree overlays, which require `CONFIG_OF_CONFIGFS` and so on. Even if those were present, the crucial issue is the memory-mapped registers at SoC physical addresses won't exist in x86 QEMU/GCE. The probe would either fail or, worse, crash because of attempted physical memory access.

Okay, so syzkaller can't directly probe platform devices or CAN devices in the traditional sense, at least not this one. How then does syzkaller test CAN devices? It must have a workaround. I need to understand this.

Right, I'm thinking, I've got it. Syzkaller leverages these various virtual and emulated interfaces, for testing CAN: `vcan`, `slcan`, `vxcan`, dummy/netlink interfaces, USB CAN adapters through syzkaller's USB emulation (using `syz_usb_connect`), and, much less frequently, PCI CAN adapters if QEMU emulates them.

But *wait*, going back to FlexCAN, does *it* have *any* of those USB or virtual front-ends that syzkaller can use? I'm going to quickly search the kernel source and make sure I don't miss anything that could be relevant. Time to widen the search beyond just the `drivers/net/can/flexcan` directory. I need to make sure I understand the full scope of how this driver is being tested.

{
  "Expression": "flexcan",
  "PathPrefix": "include"
}

{
  "Output": "include/linux/can/platform/flexcan.h-17-\ninclude/linux/can/platform/flexcan.h:18:struct flexcan_platform_data {\ninclude/linux/can/platform/flexcan.h-19-\tu32 clock_frequency;\n"
}

gemini-3.8-flash

null

null

							input: 27921
							output: 23
							thoughts: 16
						

Here's a summary of my thought process, as if I were thinking it:

**Digging into the CAN Bus Implementation**

Okay, so I need to understand how the `flexcan` driver is being used and integrated at the architectural level. I'll start by searching for all instances of "flexcan" within the `arch/` directory. That's usually the best place to begin when I'm trying to get a handle on low-level hardware interactions like this. I'm expecting to find references in platform-specific code, device tree bindings, and possibly some core initialization routines. The goal is to see how different architectures are interfacing with the `flexcan` controller and what abstractions, if any, are in play. I am looking for the usage and implementation details.

{
  "Expression": "flexcan",
  "PathPrefix": "arch"
}

{
  "Output": "\nFull output is too long, showing 500 out of 2591 lines.\nUse more precise expression if possible.\n\narch/arm/boot/dts/nxp/imx/imx25.dtsi=122=\t\t\tcan1: can@43f88000 {\narch/arm/boot/dts/nxp/imx/imx25.dtsi:123:\t\t\t\tcompatible = \"fsl,imx25-flexcan\";\narch/arm/boot/dts/nxp/imx/imx25.dtsi-124-\t\t\t\treg = \u003c0x43f88000 0x4000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx25.dtsi=131=\t\t\tcan2: can@43f8c000 {\narch/arm/boot/dts/nxp/imx/imx25.dtsi:132:\t\t\t\tcompatible = \"fsl,imx25-flexcan\";\narch/arm/boot/dts/nxp/imx/imx25.dtsi-133-\t\t\t\treg = \u003c0x43f8c000 0x4000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx35.dtsi=304=\t\t\tcan1: can@53fe4000 {\narch/arm/boot/dts/nxp/imx/imx35.dtsi:305:\t\t\t\tcompatible = \"fsl,imx35-flexcan\", \"fsl,imx25-flexcan\";\narch/arm/boot/dts/nxp/imx/imx35.dtsi-306-\t\t\t\treg = \u003c0x53fe4000 0x1000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx35.dtsi=313=\t\t\tcan2: can@53fe8000 {\narch/arm/boot/dts/nxp/imx/imx35.dtsi:314:\t\t\t\tcompatible = \"fsl,imx35-flexcan\", \"fsl,imx25-flexcan\";\narch/arm/boot/dts/nxp/imx/imx35.dtsi-315-\t\t\t\treg = \u003c0x53fe8000 0x1000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx53.dtsi=571=\t\t\tcan1: can@53fc8000 {\narch/arm/boot/dts/nxp/imx/imx53.dtsi:572:\t\t\t\tcompatible = \"fsl,imx53-flexcan\", \"fsl,imx25-flexcan\";\narch/arm/boot/dts/nxp/imx/imx53.dtsi-573-\t\t\t\treg = \u003c0x53fc8000 0x4000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx53.dtsi=581=\t\t\tcan2: can@53fcc000 {\narch/arm/boot/dts/nxp/imx/imx53.dtsi:582:\t\t\t\tcompatible = \"fsl,imx53-flexcan\", \"fsl,imx25-flexcan\";\narch/arm/boot/dts/nxp/imx/imx53.dtsi-583-\t\t\t\treg = \u003c0x53fcc000 0x4000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts=56=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-57-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts:58:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-59-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts=62=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-63-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts:64:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-65-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts=186=\t\t\tMX6QDL_PAD_SD1_CMD__GPIO1_IO18\t\t0x00000018\n--\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-189-\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts:190:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-191-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts=193=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX\t\t0x0001b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-196-\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts:197:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6dl-eckelmann-ci4x10.dts-198-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi=159=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-160-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi:161:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-162-};\n--\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi=164=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-165-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi:166:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-167-};\n--\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi=253=\t\t\tMX6QDL_PAD_GPIO_16__ENET_REF_CLK 0x4001b0a8\n--\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-256-\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi:257:\tpinctrl_flexcan1: can1grp {\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-258-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi=260=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX        0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-263-\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi:264:\tpinctrl_flexcan2: can2grp {\narch/arm/boot/dts/nxp/imx/imx6q-kp.dtsi-265-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts=163=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts-164-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts:165:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts-166-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts=395=\t\t\tMX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL\t0x13030\n--\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts-398-\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts:399:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6q-pistachio.dts-400-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6q-var-mx6customboard.dts=119=\t\t\tMX6QDL_PAD_CSI0_VSYNC__IPU1_CSI0_VSYNC\t\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6q-var-mx6customboard.dts-122-\narch/arm/boot/dts/nxp/imx/imx6q-var-mx6customboard.dts:123:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6q-var-mx6customboard.dts-124-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi=229=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-230-\tpinctrl-names = \"default\", \"sleep\";\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:231:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1_default\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:232:\tpinctrl-1 = \u003c\u0026pinctrl_flexcan1_sleep\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-233-\tstatus = \"disabled\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi=236=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-237-\tpinctrl-names = \"default\", \"sleep\";\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:238:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2_default\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:239:\tpinctrl-1 = \u003c\u0026pinctrl_flexcan2_sleep\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-240-\tstatus = \"disabled\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi=996=\t\t\tMX6QDL_PAD_ENET_TXD0__GPIO1_IO30\t0x000b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-999-\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:1000:\tpinctrl_flexcan1_default: flexcan1defgrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1001-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi=1003=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX 0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1006-\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:1007:\tpinctrl_flexcan1_sleep: flexcan1slpgrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1008-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi=1010=\t\t\tMX6QDL_PAD_GPIO_8__GPIO1_IO08 0x0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1013-\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:1014:\tpinctrl_flexcan2_default: flexcan2defgrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1015-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi=1017=\t\t\tMX6QDL_PAD_KEY_ROW4__FLEXCAN2_RX 0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1019-\t};\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi:1020:\tpinctrl_flexcan2_sleep: flexcan2slpgrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-apalis.dtsi-1021-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi=143=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi-144-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi:145:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi-146-\txceiver-supply = \u003c\u0026reg_5v\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi=301=\t\t\tMX6QDL_PAD_KEY_COL2__GPIO4_IO10  0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi-304-\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi:305:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-apf6dev.dtsi-306-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi=57=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-58-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi:59:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-60-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi=63=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-64-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi:65:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-66-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi=237=\t\t\tMX6QDL_PAD_ENET_CRS_DV__ENET_RX_EN  0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-240-\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi:241:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-242-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi=244=\t\t\tMX6QDL_PAD_KEY_COL2__FLEXCAN1_TX\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-247-\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi:248:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos.dtsi-249-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi=100=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-101-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi:102:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-103-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi=106=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-107-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi:108:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-109-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi=473=\t\t\tMX6QDL_PAD_RGMII_RX_CTL__RGMII_RX_CTL 0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-476-\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi:477:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-478-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi=480=\t\t\tMX6QDL_PAD_SD3_CMD__FLEXCAN1_TX 0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-483-\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi:484:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-aristainetos2.dtsi-485-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi=171=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-172-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi:173:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-174-\tstatus = \"disabled\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi=178=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-179-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi:180:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-181-\tstatus = \"disabled\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi=829=\t\t\tMX6QDL_PAD_GPIO_16__ENET_REF_CLK\t((1\u003c\u003c30) | 0x1b0b0)\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-832-\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi:833:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-834-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi=836=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX\t\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-839-\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi:840:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-colibri.dtsi-841-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi=81=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi:82:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi-83-\tpinctrl-names = \"default\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi=94=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi:95:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi-96-\tpinctrl-names = \"default\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi=608=\t\t\tMX6QDL_PAD_KEY_ROW4__GPIO4_IO15\t\t0xb1 /* Int */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi-611-\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi:612:\tpinctrl_flexcan1: flexcan1-grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi-613-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi=615=\t\t\tMX6QDL_PAD_KEY_COL2__FLEXCAN1_TX\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi-618-\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi:619:\tpinctrl_flexcan2: flexcan2-grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-dhcom-som.dtsi-620-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi=180=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi-181-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi:182:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi-183-\txceiver-supply = \u003c\u0026reg_can1_stby\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi=618=\t\t\tMX6QDL_PAD_ENET_TXD0__GPIO1_IO30\t0x1b0b0 /* PHY Reset */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi-621-\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi:622:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw52xx.dtsi-623-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi=180=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi-181-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi:182:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi-183-\txceiver-supply = \u003c\u0026reg_can1_stby\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi=606=\t\t\tMX6QDL_PAD_GPIO_16__ENET_REF_CLK\t0x4001b0a8\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi-609-\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi:610:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw53xx.dtsi-611-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi=200=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi-201-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi:202:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi-203-\txceiver-supply = \u003c\u0026reg_can1_stby\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi=681=\t\t\tMX6QDL_PAD_EIM_RW__GPIO2_IO26\t0x100b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi-684-\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi:685:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw54xx.dtsi-686-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi=152=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi-153-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi:154:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi-155-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi=514=\t\t\tMX6QDL_PAD_DISP0_DAT13__AUD5_RXFS\t0x130b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi-517-\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi:518:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw551x.dtsi-519-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi=218=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi-219-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi:220:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi-221-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi=692=\t\t\tMX6QDL_PAD_ENET_TXD0__GPIO1_IO30\t0x4001b0b0 /* PHY_RST# */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi-695-\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi:696:\tpinctrl_flexcan: flexcangrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw560x.dtsi-697-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi=124=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi-125-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi:126:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi-127-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi=431=\t\t\tMX6QDL_PAD_EIM_RW__GPIO2_IO26\t0x100b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi-434-\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi:435:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-gw5912.dtsi-436-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi=181=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi-182-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi:183:\tpinctrl-0 = \u003c\u0026pinctrl_hummingboard_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi-184-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi=225=\u0026iomuxc {\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi:226:\tpinctrl_hummingboard_flexcan1: hummingboard-flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi-227-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi=133=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-134-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi:135:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-136-\txceiver-supply = \u003c\u0026reg_3p3v\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi=139=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-140-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi:141:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-142-\txceiver-supply = \u003c\u0026reg_3p3v\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi=316=\t\t\tMX6QDL_PAD_GPIO_17__GPIO7_IO12\t\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-319-\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi:320:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-321-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi=323=\t\t\tMX6QDL_PAD_KEY_COL2__FLEXCAN1_TX 0x1b020\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-326-\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi:327:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-icore.dtsi-328-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi=235=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-236-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi:237:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-238-};\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi=241=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-242-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi:243:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-244-};\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi=476=\t\t\tMX6QDL_PAD_EIM_D25__GPIO3_IO25 0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-479-\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi:480:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-481-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi=483=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX 0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-486-\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi:487:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-kontron-samx6i.dtsi-488-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi=53=\treg_en_switch: regulator-en-switch {\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-64-\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:65:\treg_flexcan1: regulator-flexcan1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-66-\t\tcompatible = \"regulator-fixed\";\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-67-\t\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:68:\t\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1_en\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:69:\t\tregulator-name = \"flexcan1-reg\";\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-70-\t\tregulator-min-microvolt = \u003c1500000\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi=133=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-134-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:135:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:136:\txceiver-supply = \u003c\u0026reg_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-137-\tstatus = \"disabled\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi=277=\t\t\tMX6QDL_PAD_EIM_DA4__GPIO3_IO04\t\t0xb0b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-280-\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:281:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-282-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi=284=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX\t\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-287-\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi:288:\tpinctrl_flexcan1_en: flexcan1engrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-mira.dtsi-289-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi=60=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi-61-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi:62:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi-63-\tstatus = \"disabled\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi=257=\t\t\tMX6QDL_PAD_EIM_D23__GPIO3_IO23\t\t0x80000000 /* Reset GPIO */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi-260-\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi:261:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-phytec-pfla02.dtsi-262-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi=148=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-149-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi:150:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-151-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi=154=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-155-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi:156:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-157-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi=435=\t\t\tMX6QDL_PAD_ENET_RXD1__GPIO1_IO26\t0x1f0b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-438-\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi:439:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-440-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi=442=\t\t\tMX6QDL_PAD_KEY_ROW2__FLEXCAN1_RX\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-445-\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi:446:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-pico.dtsi-447-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi=311=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-312-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi:313:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-314-\txceiver-supply = \u003c\u0026reg_can_stby\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi=318=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-319-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi:320:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-321-\txceiver-supply = \u003c\u0026reg_can_stby\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi=535=\t\t\tMX6QDL_PAD_GPIO_9__ESAI_RX_FS       0x1b030\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-538-\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi:539:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-540-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi=542=\t\t\tMX6QDL_PAD_KEY_COL2__FLEXCAN1_TX\t0x17059\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-545-\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi:546:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-sabreauto.dtsi-547-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi=85=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-86-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi:87:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-88-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi=91=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-92-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi:93:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-94-\tstatus = \"okay\";\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi=202=\t\t\tMX6QDL_PAD_DI0_PIN4__GPIO4_IO20\t\t0x1b0b1 /* ETH_PHY_RESET */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-205-\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi:206:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-207-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi=209=\t\t\tMX6QDL_PAD_KEY_COL2__FLEXCAN1_TX\t0x1b0b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-212-\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi:213:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts4900.dtsi-214-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi=153=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-154-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi:155:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-156-\txceiver-supply = \u003c\u0026reg_can1_3v3\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi=160=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-161-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi:162:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-163-\txceiver-supply = \u003c\u0026reg_can2_3v3\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi=302=\t\t\tMX6QDL_PAD_GPIO_6__ENET_IRQ\t\t0x000b1\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-305-\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi:306:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-307-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi=310=\t\t\tMX6QDL_PAD_DISP0_DAT0__GPIO4_IO21\t0x1b088 /* EN_CAN_1 */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-313-\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi:314:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-ts7970.dtsi-315-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi=94=\treg_can_xcvr: regulator-can-xcvr {\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-99-\t\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi:100:\t\tpinctrl-0 = \u003c\u0026pinctrl_flexcan_xcvr\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-101-\t\tgpio = \u003c\u0026gpio4 21 GPIO_ACTIVE_LOW\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi=203=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-204-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi:205:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan1\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-206-\txceiver-supply = \u003c\u0026reg_can_xcvr\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi=210=\u0026can2 {\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-211-\tpinctrl-names = \"default\";\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi:212:\tpinctrl-0 = \u003c\u0026pinctrl_flexcan2\u003e;\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-213-\txceiver-supply = \u003c\u0026reg_can_xcvr\u003e;\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi=457=\t\t\tMX6QDL_PAD_SD3_DAT2__GPIO7_IO06\t\t0x1b0b1 /* ETN PHY RESET */\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-460-\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi:461:\tpinctrl_flexcan1: flexcan1grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-462-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi=464=\t\t\tMX6QDL_PAD_GPIO_8__FLEXCAN1_RX\t\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-467-\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi:468:\tpinctrl_flexcan2: flexcan2grp {\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-469-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi=471=\t\t\tMX6QDL_PAD_KEY_ROW4__FLEXCAN2_RX\t0x1b0b0\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-474-\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi:475:\tpinctrl_flexcan_xcvr: flexcan-xcvrgrp {\narch/arm/boot/dts/nxp/imx/imx6qdl-tx6.dtsi-476-\t\tfsl,pins = \u003c\n--\narch/arm/boot/dts/nxp/imx/imx6qdl-var-dart.dtsi=63=\u0026can1 {\narch/arm/boot/dts/nxp/imx/imx6qdl-var-dart.dtsi-64-\tpinctrl-names = \"default\";\n\n"
}

gemini-3.8-flash

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null

							input: 44819
							output: 27
							thoughts: 72
						

**My Assessment of flexcan DTS Files**

Alright, let's break this down. My initial observation is that every single Device Tree Source (DTS) file I'm seeing that mentions "flexcan" seems exclusively related to ARM, ARM64, PowerPC, or m68k System-on-Chips (SoCs). I'm thinking about the usual suspects here, the i.MX series, the LS1021A, the LX2160, the VF610, the S32G – that whole ecosystem.

Now, the crucial question. Is there *any* architecture like x86 that's leveraging flexcan? I need to verify this assumption. Let's dig deeper and perform a proper cross-reference to confirm there are no x86-based systems using flexcan. Time to double-check.

no matches

{
  "Expression": "flexcan",
  "PathPrefix": "arch/x86"
}

{
  "error": "no matches"
}

gemini-3.8-flash

null

null

							input: 45115
							output: 25
							thoughts: 30
						

Here's my thought process, as if I were considering this myself:

**Investigating Potential CAN-Flex Controller Interaction Points**

Okay, I need to pinpoint where the CAN-Flex controller might be interacting with the system at a low level. Given the likely architectural context, my first line of attack is the classic places: `include/` and `drivers/`. I need to zero in on any potential points of integration related to x86 platforms, PCI configuration, ACPI power management, or USB host controller assignments. These areas are all likely candidates for having hooks or drivers that might relate to the CAN-Flex controller. I'll need to look for headers and driver source files that mention "x86", "PCI", "ACPI", "USB," and of course, "flexcan" itself. This will hopefully provide insight into how the controller is initialized, configured, and managed within the broader system. From there I can determine how it’s being interfaced with by the kernel.

no matches

{
  "Expression": "flexcan",
  "PathPrefix": "drivers/bus"
}

{
  "error": "no matches"
}

gemini-3.8-flash

null

null

							input: 45391
							output: 26
							thoughts: 10
						

Here's a summary of my thought process, as if I were considering the given prompt:

**Initial Assessment: Navigating the mfd Subsystem**

Alright, the directive is clear. We're starting with `drivers/mfd`. That's a sensible approach, given the likely context. The "mfd" (multi-function device) area is a common entry point for investigating complex hardware interactions, especially when dealing with integrated systems. My experience tells me this is often where the abstraction layers begin. I immediately start mentally cataloging potential areas of interest within that directory. I'll be looking for common patterns, things like how the driver framework is implemented, and the level of abstraction it presents, but also how it handles power management and resource allocation. I need to get a high-level view of the architecture before diving into specific drivers or device instances. I anticipate finding structures, function calls, and potentially a DT (Device Tree) setup, which will all be crucial for understanding the overall system integration. From my experience with embedded systems, this is a good first step.

no matches

{
  "Expression": "flexcan",
  "PathPrefix": "drivers/mfd"
}

{
  "error": "no matches"
}

gemini-3.8-flash

null

null

							input: 45664
							output: 26
							thoughts: 10
						

Okay, here's my attempt at summarizing the thought process, as if I were a seasoned professional in the field, starting with the requested bolded header:

**Diving into the PCI Subsystem**

Alright, time to dig in. The problem likely lies somewhere within the PCI subsystem, so let's start by taking a look at `drivers/pci`. This is the logical place to begin troubleshooting, given my understanding of the system architecture and the potential area of impact for the reported issue. I need to get a high level understanding of the code and look for likely culprit, like a recent change, driver interaction, or potential resource conflict. This initial perusal will probably be broad, scanning for anything that jumps out – any recent patches, obvious error handling issues, or unusual device behavior. I'll be looking for clues like memory allocation issues, interrupt handling problems, or anything related to device enumeration and initialization. I will keep an eye out for how this is working alongside device drivers and how we are handling power or configuration changes. It's a systematic process – a broad scan first, then I'll narrow my focus based on what I find, or don't find. Time to get to it.

no matches

{
  "Expression": "flexcan",
  "PathPrefix": "drivers/pci"
}

{
  "error": "no matches"
}

gemini-3.8-flash

null

null

							input: 45964
							output: 25
							thoughts: 9
						

Here's a summary of my thought process, as if I were the one thinking it:

**Diving into the Platform Drivers**

Okay, time to get to the heart of the matter. Let's start by zeroing in on the `drivers/platform` directory. This is usually where the core low-level drivers for hardware that is "platform-specific" reside. That's a key term. "Platform-specific" means the code is highly tied to the particular architecture, chipset, or board. This is where I'll expect to find drivers for things like interrupt controllers, clock management, power management, perhaps the system timer, and other critical infrastructure components that are fundamental to the operation of this particular system. I want to see how these low-level components are implemented and how they interact with the kernel. I am anticipating the organization here, the naming conventions, and the overall structure, based on my past experience. I'm looking for the key entry points and any unusual or optimized code. Time to dig in and see what's what.

no matches

{
  "Expression": "flexcan",
  "PathPrefix": "drivers/platform"
}

{
  "error": "no matches"
}

gemini-3.8-flash

null

null

							input: 46232
							output: 129
							thoughts: 900
						

**FlexCAN Driver: Unreachable Hardware on amd64, WorthFuzzing = False**

Okay, let's solidify this. I need to make a judgment call on whether this FlexCAN driver code is worth fuzzing on amd64. First, let's re-examine those Kconfig dependencies. The `flexcan` driver, clearly, relies on either Device Tree (`OF`) or `COMPILE_TEST`, and, crucially, requires `HAS_IOMEM`. Even if we somehow force-enable the `CAN_FLEXCAN` option, either directly (`y`) or as a module (`m`), via `COMPILE_TEST` or DT, it's a dead end. The driver's probe function (`flexcan_driver`) is looking for specific platform devices, either `"flexcan-mcf5441x"` (ColdFire) or a device matching a FlexCAN OF match.

Now, I know this well: on standard amd64 environments, like the typical QEMU or Google Compute Engine instances we use, there's *no* emulated FlexCAN. The device isn't present in any standard device tree, and QEMU doesn't emulate the hardware. Even if we tried some hacky userspace device tree overlay (which syzkaller *doesn't* do, thankfully), the driver would immediately hit fatal errors when trying to get IRQs, remap memory regions, and lookup clocks. That's a fundamental architectural incompatibility.

Let's refer back to Section 2 of our guidelines. *Structurally unreachable hardware* is a key negative criterion. This perfectly fits: FlexCAN is an SoC-specific CAN controller, found in Freescale/NXP SoCs like i.MX, ColdFire, Layerscape, S32G, and PowerPC P1010. It's not a generic device like a PCIe card or a virtual device. It *requires* the specific SoC platform and corresponding Device Tree definitions. It's not like the devices we *can* find in QEMU.

And, as a specific example, the function `flexcan_get_berr_counter` is only called when a flexcan net device *exists*. We access the BERR counter through `can_get_berr_counter`, typically from a ioctl. But since we cannot instantiate this net device in a standard amd64 environment, this is effectively *unreachable* code, even if it's there in the source.

So, just to be absolutely clear: Target architecture: amd64. Patch modifies `flexcan_get_berr_counter`. Result: `WorthFuzzing = false`. `FocusSymbols = []`, no need for specific `EnableConfigs`. The reasoning is clear: FlexCAN is unreachable hardware in our standard amd64 virtualized environment. This is a solid "no." It's not a relevant target for fuzzing in this context. Let's call the results and move on.

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch modifies flexcan_get_berr_counter() in drivers/net/can/flexcan/flexcan-core.c. FlexCAN is an on-chip CAN controller integrated into Freescale/NXP SoCs (ARM, PowerPC, ColdFire) and binds exclusively via platform/OF matching. It requires physical SoC hardware not emulated in standard QEMU or GCE virtual environments on amd64. Consequently, the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies flexcan_get_berr_counter() in drivers/net/can/flexcan/flexcan-core.c. FlexCAN is an on-chip CAN controller integrated into Freescale/NXP SoCs (ARM, PowerPC, ColdFire) and binds exclusively via platform/OF matching. It requires physical SoC hardware not emulated in standard QEMU or GCE virtual environments on amd64. Consequently, the modified code is structurally unreachable.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null