> Generally all rockchip boards use this value instead of the rgmii_id, > I imagine because it's more consistent to tune here than the hit or > miss support of the phy drivers. Most PHY drivers actually implement it correctly, since by default, most systems get the PHY to do the delays. But if most Rockchip boards do it this way, there is a lot to be said for consistence, so this is fine by me. Andrew