PHY_SPEED_SHIFT
((PHY_SPEED_1000 << PHY_SPEED_SHIFT) | (BC_PTP_V2 << PTP_MODE_SHIFT))
speed_conf = PHY_SPEED_10 << PHY_SPEED_SHIFT;
speed_conf = PHY_SPEED_100 << PHY_SPEED_SHIFT;
speed_conf = PHY_SPEED_1000 << PHY_SPEED_SHIFT;
port_conf &= ~(0x3 << PHY_SPEED_SHIFT);