BCM54XX_SHD_MODE
val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_MODE);
rc = bcm_phy_write_shadow(phydev, BCM54XX_SHD_MODE, val);
rc = bcm_phy_write_shadow(phydev, BCM54XX_SHD_MODE, val);
rc = bcm_phy_write_shadow(phydev, BCM54XX_SHD_MODE, val);
val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_MODE);