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+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:
+ This attribute contains the boolean value whether a given PHY
+ device has had any "fixup" workaround running on it, encoded as
+ a boolean. This information is provided to help troubleshooting
+ PHY configurations.
+
+What: /sys/class/mdio_bus/<bus>/<device>/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.
+
+What: /sys/class/mdio_bus/<bus>/<device>/phy_interface
+Date: February 2014
+KernelVersion: 3.15
+Contact: netdev@vger.kernel.org
+Description:
+ This attribute contains the PHY interface as configured by the
+ Ethernet driver during bus enumeration, encoded in string.
+ This interface mode is used to configure the Ethernet MAC with the
+ appropriate mode for its data lines to the PHY hardware.
+
+ 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,
+ xaui, 10gbase-kr, unknown
+
+What: /sys/class/mdio_bus/<bus>/<device>/phy_standalone
+Date: May 2019
+KernelVersion: 5.3
+Contact: netdev@vger.kernel.org
+Description:
+ Boolean value indicating whether the PHY device is used in
+ standalone mode, without a net_device associated, by PHYLINK.
+ Attribute created only when this is the case.
+
+What: /sys/class/mdio_bus/<bus>/<device>/phy_dev_flags
+Date: March 2021
+KernelVersion: 5.13
+Contact: netdev@vger.kernel.org
+Description:
+ 32-bit hexadecimal number representing a bit mask of the
+ configuration bits passed from the consumer of the PHY
+ (Ethernet MAC, switch, etc.) to the PHY driver. The flags are
+ only used internally by the kernel and their placement are
+ not meant to be stable across kernel versions. This is intended
+ for facilitating the debugging of PHY drivers.