Wait until a PHY becomes ready in the probe callback by
using read_poll_timeout function.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
---

drivers/net/phy/qt2025.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/qt2025.rs b/drivers/net/phy/qt2025.rs
index 0b9400dcb4c1..aaaead6512a0 100644
--- a/drivers/net/phy/qt2025.rs
+++ b/drivers/net/phy/qt2025.rs
@@ -12,6 +12,7 @@
 use kernel::c_str;
 use kernel::error::code;
 use kernel::firmware::Firmware;
+use kernel::io::poll::read_poll_timeout;
 use kernel::net::phy::{
     self,
     reg::{Mmd, C45},
@@ -19,6 +20,7 @@
 };
 use kernel::prelude::*;
 use kernel::sizes::{SZ_16K, SZ_8K};
+use kernel::time::Delta;
 
 kernel::module_phy_driver! {
     drivers: [PhyQT2025],
@@ -93,7 +95,13 @@ fn probe(dev: &mut phy::Device) -> Result<()> {
         // The micro-controller will start running from SRAM.
         dev.write(C45::new(Mmd::PCS, 0xe854), 0x0040)?;
 
-        // TODO: sleep here until the hw becomes ready.
+        read_poll_timeout(
+            || dev.read(C45::new(Mmd::PCS, 0xd7fd)),
+            |val| *val != 0x00 && *val != 0x10,
+            Delta::from_millis(50),
+            Delta::from_secs(3),
+        )?;
+
         Ok(())
     }
 

base-commit: 89aec171d9d1ab168e43fcf9754b82e4c0aef9b9
-- 
2.43.0