mdiobb_read_c45
res = mdiobb_read_c45(bus, phy, devad, reg);
ret = mdiobb_read_c45(bus, phy, devad, reg);
EXPORT_SYMBOL(mdiobb_read_c45);
bus->read_c45 = mdiobb_read_c45;
int mdiobb_read_c45(struct mii_bus *bus, int devad, int phy, int reg);