mdio_read_latched
status = mdio_read_latched(ioaddr, phy->phy_id, MII_BMSR);
status = mdio_read_latched(ioaddr, mii_if->phy_id, MII_BMSR);
status = mdio_read_latched(ioaddr, phy_id, MII_BMSR);
val = mdio_read_latched(ioaddr, phy_id, MII_BMSR);