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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>/c45_phy_ids/mmd<n>_device_id
30Date: June 2025
31KernelVersion: 6.17
32Contact: netdev@vger.kernel.org
33Description:
34 This attribute contains the 32-bit PHY Identifier as reported
35 by the device during bus enumeration, encoded in hexadecimal.
36 These C45 IDs are used to match the device with the appropriate
37 driver. These files are invisible to the C22 device.
38
39What: /sys/class/mdio_bus/<bus>/<device>/phy_interface
40Date: February 2014
41KernelVersion: 3.15
42Contact: netdev@vger.kernel.org
43Description:
44 This attribute contains the PHY interface as configured by the
45 Ethernet driver during bus enumeration, encoded in string.
46 This interface mode is used to configure the Ethernet MAC with the
47 appropriate mode for its data lines to the PHY hardware.
48
49 Possible values are:
50
51 <empty> (not available), mii, gmii, sgmii, tbi, rev-mii,
52 rmii, rgmii, rgmii-id, rgmii-rxid, rgmii-txid, rtbi, smii
53 xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui,
54 xaui, 10gbase-kr, unknown
55
56What: /sys/class/mdio_bus/<bus>/<device>/phy_standalone
57Date: May 2019
58KernelVersion: 5.3
59Contact: netdev@vger.kernel.org
60Description:
61 Boolean value indicating whether the PHY device is used in
62 standalone mode, without a net_device associated, by PHYLINK.
63 Attribute created only when this is the case.
64
65What: /sys/class/mdio_bus/<bus>/<device>/phy_dev_flags
66Date: March 2021
67KernelVersion: 5.13
68Contact: netdev@vger.kernel.org
69Description:
70 32-bit hexadecimal number representing a bit mask of the
71 configuration bits passed from the consumer of the PHY
72 (Ethernet MAC, switch, etc.) to the PHY driver. The flags are
73 only used internally by the kernel and their placement are
74 not meant to be stable across kernel versions. This is intended
75 for facilitating the debugging of PHY drivers.