From: Selvamani Rajagopal <Selvamani.Rajagopal@onsemi.com>

Add YAML device tree binding for the onsemi S2500 IEEE 802.3cg
compliant Ethernet transceiver device.

We use IRQF_TRIGGER_FALLING, though OPEN Alliance 10BASE-T1x
Serial Interface specification calls for IRQF_TRIGGER_LOW.

This is to match IRQF_TRIGGER_FALLING used by OA TC6 framework code.
This bug fix requires changes to the stable branch. At that time,
this will be changed to IRQF_TRIGGER_LOW.

Signed-off-by: Selvamani Rajagopal <Selvamani.Rajagopal@onsemi.com>

---
changes in v6
  - Moved the signed off information to the right place.
changes in v5
  - no changes
changes in v4:
  - added spi-max-frequency as suggested by AI review
  - changed interrupt to IRQ_TYPE_EDGE_FALLING as it is
    being taken care in net (stable) branch
changes in v3
  - Removed URL link that failed verification
changes in v2
  - removed spi-max-frequency entry
  - changed the compatible string to s2500
changes in v1
  - Added the first version of YAML file for onsemi MAC-PHY
---
 .../devicetree/bindings/net/onnn,s2500.yaml        | 67 ++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/onnn,s2500.yaml b/Documentation/devicetree/bindings/net/onnn,s2500.yaml
new file mode 100644
index 000000000000..11edf10508d9
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/onnn,s2500.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/onnn,s2500.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: onsemi S2500 10BASE-T1S MACPHY Ethernet Controllers
+
+maintainers:
+  - Piergiorgio Beruto <pier.beruto@onsemi.com>
+  - Selva Rajagopal <Selvamani.Rajagopal@onsemi.com>
+
+description:
+  The S2500 combines a Media Access Controller (MAC) and an
+  Ethernet PHY to enable 10BASE‑T1S networks. The Ethernet Media Access
+  Controller (MAC) module implements a 10 Mbps half duplex Ethernet MAC,
+  compatible with the IEEE 802.3 standard and a 10BASE-T1S physical layer
+  transceiver integrated into the S2500. The communication between
+  the host and the MAC-PHY is specified in the OPEN Alliance 10BASE-T1x
+  MACPHY Serial Interface (TC6).
+
+allOf:
+  - $ref: /schemas/net/ethernet-controller.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    const: onnn,s2500
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    description:
+      Interrupt from MAC-PHY asserted in the event of Receive Chunks
+      Available, Transmit Chunk Credits Available and Extended Status
+      Event.
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 25000000
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - spi-max-frequency
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ethernet@0 {
+        compatible = "onnn,s2500";
+        reg = <0>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&eth0_pins>;
+        interrupt-parent = <&gpio>;
+        interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
+        spi-max-frequency = <15000000>;
+      };
+    };

-- 
2.43.0