SGMII_PHY_SPEED_MASK
SGMII_PHY_SPEED_MASK, rgc3);
#define SGMII_PHY_SPEED_1_25G FIELD_PREP(SGMII_PHY_SPEED_MASK, 0)
#define SGMII_PHY_SPEED_3_125G FIELD_PREP(SGMII_PHY_SPEED_MASK, 1)