mdio_device_create
switch_mdiodev = mdio_device_create(bus, 31);
mdiodev = mdio_device_create(mdio, addr);
mdio = mdio_device_create(bus, addr);
mdiodev = mdio_device_create(pxpcs->bus, 0);
mdiodev = mdio_device_create(bus, addr);
EXPORT_SYMBOL(mdio_device_create);
struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);