Man page 9 : get_phy_id

get_phy_id - reads the specified addr for its ID.

int get_phy_id(struct mii_bus *  bus , int  addr , u32 *  phy_id , bool  is_c45 , struct phy_c45_device_ids *  c45_ids );

bus
    the target MII bus

addr
    PHY address on the MII bus

phy_id
    where to store the ID retrieved.

is_c45
    If true the PHY uses the 802.3 clause 45 protocol

c45_ids
    where to store the c45 ID information.

In the case of a 802.3-c22 PHY, reads the ID registers of the PHY at addr on the bus, stores it in phy_id and returns zero on success.

In the case of a 802.3-c45 PHY, get_phy_c45_ids is invoked, and its return value is in turn returned.