MII_BRCM_FET_SHDW_AUXMODE4
err = __phy_set_bits(phydev, MII_BRCM_FET_SHDW_AUXMODE4, reg);
reg = __phy_read(phydev, MII_BRCM_FET_SHDW_AUXMODE4);
err = __phy_modify(phydev, MII_BRCM_FET_SHDW_AUXMODE4,