1What:		/sys/class/mdio_bus/<bus>/<device>/attached_dev
2Date:		May 2017
3KernelVersion:	4.13
4Contact:	netdev@vger.kernel.org
5Description:
6		Symbolic link to the network device this PHY device is
7		attached to.
8
9What:		/sys/class/mdio_bus/<bus>/<device>/phy_has_fixups
10Date:		February 2014
11KernelVersion:	3.15
12Contact:	netdev@vger.kernel.org
13Description:
14		This attribute contains the boolean value whether a given PHY
15		device has had any "fixup" workaround running on it, encoded as
16		a boolean. This information is provided to help troubleshooting
17		PHY configurations.
18
19What:		/sys/class/mdio_bus/<bus>/<device>/phy_id
20Date:		November 2012
21KernelVersion:	3.8
22Contact:	netdev@vger.kernel.org
23Description:
24		This attribute contains the 32-bit PHY Identifier as reported
25		by the device during bus enumeration, encoded in hexadecimal.
26		This ID is used to match the device with the appropriate
27		driver.
28
29What:		/sys/class/mdio_bus/<bus>/<device>/phy_interface
30Date:		February 2014
31KernelVersion:	3.15
32Contact:	netdev@vger.kernel.org
33Description:
34		This attribute contains the PHY interface as configured by the
35		Ethernet driver during bus enumeration, encoded in string.
36		This interface mode is used to configure the Ethernet MAC with the
37		appropriate mode for its data lines to the PHY hardware.
38
39		Possible values are:
40
41		<empty> (not available), mii, gmii, sgmii, tbi, rev-mii,
42		rmii, rgmii, rgmii-id, rgmii-rxid, rgmii-txid, rtbi, smii
43		xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui,
44		xaui, 10gbase-kr, unknown
45
46What:		/sys/class/mdio_bus/<bus>/<device>/phy_standalone
47Date:		May 2019
48KernelVersion:	5.3
49Contact:	netdev@vger.kernel.org
50Description:
51		Boolean value indicating whether the PHY device is used in
52		standalone mode, without a net_device associated, by PHYLINK.
53		Attribute created only when this is the case.
54
55What:		/sys/class/mdio_bus/<bus>/<device>/phy_dev_flags
56Date:		March 2021
57KernelVersion:	5.13
58Contact:	netdev@vger.kernel.org
59Description:
60		32-bit hexadecimal number representing a bit mask of the
61		configuration bits passed from the consumer of the PHY
62		(Ethernet MAC, switch, etc.) to the PHY driver. The flags are
63		only used internally by the kernel and their placement are
64		not meant to be stable across kernel versions. This is intended
65		for facilitating the debugging of PHY drivers.
66