| 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>/c45_phy_ids/mmd<n>_device_id | |
| Date: June 2025 | |
| KernelVersion: 6.17 | |
| 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. | |
| These C45 IDs are used to match the device with the appropriate | |
| driver. These files are invisible to the C22 device. | |
| 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. |