Reads the specified phy device and returns its phy_device struct
struct phy_device * get_phy_device(struct mii_bus * bus, int addr, bool is_c45);
bus
the target MII bus
addr
PHY address on the MII bus
is_c45
If true the PHY uses the 802.3 clause 45 protocol
Reads the ID registers of the PHY at addr on the bus, then allocates and returns the phy_device to represent it.