MII_DP83811_SGMII_CTRL
value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
err = phy_write(phydev, MII_DP83811_SGMII_CTRL,