MII_VSC73XX_PHY_CTRL_EXT3_DOWNSHIFT_EN
enable = FIELD_GET(MII_VSC73XX_PHY_CTRL_EXT3_DOWNSHIFT_EN, val);
mask = MII_VSC73XX_PHY_CTRL_EXT3_DOWNSHIFT_EN;
val = MII_VSC73XX_PHY_CTRL_EXT3_DOWNSHIFT_EN |