E1000_MMDAC
ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, dev_addr);
ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, E1000_MMDAC_FUNC_DATA |
ret_val = hw->phy.ops.write_reg(hw, E1000_MMDAC, 0);