MII_CFG1
changed = phy_modify_changed(phydev, MII_CFG1, MII_CFG1_MASTER_SLAVE, ctl);
ret = phy_modify(phydev, MII_CFG1, reg_mask, reg_val);
ret = phy_modify(phydev, MII_CFG1, reg_mask, reg_val);
ret = phy_clear_bits(phydev, MII_CFG1, MII_CFG1_SLEEP_CONFIRM);
ret = phy_read(phydev, MII_CFG1);