net: sysfs: Document PHY device sysfs attributes

Document the different sysfs attributes that exist for PHY devices:
attached_dev, phy_has_fixups, phy_id and phy_interface.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/ABI/testing/sysfs-class-net-phydev b/Documentation/ABI/testing/sysfs-class-net-phydev
new file mode 100644 (file)
index 0000000..c768d5f
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-net-phydev
@@ -0,0 +1,36 @@
+What:          /sys/class/mdio_bus/<bus>/<device>/attached_dev
+Date:          May 2017
+KernelVersion: 4.13
+Contact:       netdev@vger.kernel.org
+Description:
+               Symbolic link to the network device this PHY device is
+               attached to.
+
+What:          /sys/class/mdio_bus/<bus>/<device>/phy_has_fixups
+Date:          February 2014
+KernelVersion: 3.15
+Contact:       netdev@vger.kernel.org
+Description:
+               Boolean value indicating whether the PHY device has
+               any fixups registered against it (phy_register_fixup)
+
+What:          /sys/class/mdio_bus/<bus>/<device>/phy_id
+Date:          November 2012
+KernelVersion: 3.8
+Contact:       netdev@vger.kernel.org
+Description:
+               32-bit hexadecimal value corresponding to the PHY device's OUI,
+               model and revision number.
+
+What:          /sys/class/mdio_bus/<bus>/<device>/phy_interface
+Date:          February 2014
+KernelVersion: 3.15
+Contact:       netdev@vger.kernel.org
+Description:
+               String value indicating the PHY interface, possible
+               values are:.
+               <empty> (not available), mii, gmii, sgmii, tbi, rev-mii,
+               rmii, rgmii, rgmii-id, rgmii-rxid, rgmii-txid, rtbi, smii
+               xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui,
+               unknown
+