MV_PMA_21X0_PORT_CTRL
mactype = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_21X0_PORT_CTRL);
err = phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_21X0_PORT_CTRL,