In-kernel structures for MII and MDIO.

• Use The MDIO Bus To Interrogate Complex Devices
• MDIO Background
• Clause 22 Access to Clause 45 Registers
• Intel MDIO Clause 45

• include/
  • uapi/
    • linux/
      • mii.h
      • mdio.h
  • linux/
    • mii.h
    • mdio.h
    • of_mdio.h
• drivers/
  • net/
    • mii.c
    • mdio.c
  • of/
    • of_mdio.c