phylib: mdio: Add sysfs attribute for PHY identifiers.
This adds a phy_id sysfs attribute to MDIO devices, containing the
32-bit PHY identifier reported by the device. This attribute can
be useful when debugging problems related to phy drivers. Other
enumerable buses already have similar attributes.
Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/ABI/testing/sysfs-bus-mdio b/Documentation/ABI/testing/sysfs-bus-mdio
new file mode 100644
index 0000000..6349749
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-mdio
@@ -0,0 +1,9 @@
+What: /sys/bus/mdio_bus/devices/.../phy_id
+Date: November 2012
+KernelVersion: 3.8
+Contact: netdev@vger.kernel.org
+Description:
+ This attribute contains the 32-bit PHY Identifier as reported
+ by the device during bus enumeration, encoded in hexadecimal.
+ This ID is used to match the device with the appropriate
+ driver.