MII_BCM7XXX_100TX_DISC
phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0F00);
phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0C00);
{ MII_BCM7XXX_100TX_DISC, 0x7000 },