MDIO_MMD_C22EXT
val = phy_read_mmd(phydev, MDIO_MMD_C22EXT, stat->reg);
val = phy_read_mmd(phydev, MDIO_MMD_C22EXT, stat->reg + 1);
#define MDIO_DEVS_C22EXT MDIO_DEVS_PRESENT(MDIO_MMD_C22EXT)