What: /sys/bus/mdio_bus/devices/.../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.
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