BCM54XX_SHD_SCR3
val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_SCR3);
bcm_phy_write_shadow(phydev, BCM54XX_SHD_SCR3, val);
ret = bcm_phy_read_shadow(phydev, BCM54XX_SHD_SCR3);
ret = bcm_phy_write_shadow(phydev, BCM54XX_SHD_SCR3, val);
val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_SCR3);
bcm_phy_write_shadow(phydev, BCM54XX_SHD_SCR3, val);