of_mdio_find_bus
priv->master_mii_bus = of_mdio_find_bus(dn);
parent_bus = of_mdio_find_bus(parent_bus_node);
parent_bus = of_mdio_find_bus(parent_bus_node);
EXPORT_SYMBOL(of_mdio_find_bus);
bus = of_mdio_find_bus(dn);
struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);