Hi Andrew, > DT describes the board. Does the board add the 2ns delay via extra long clock > lines? If yes, use rgmii. If the MAC/PHY pair need to add the 2ns delay, use > rgmii-id. > > If the MAC/PHY pair is adding the delay, the DT says nothing about how they > add the delay. > > The general rule is the PHY adds the delay. If you look at drivers/net/phy/*.c, > every PHY that implements RGMII support both > PHY_INTERFACE_MODE_RGMII_ID and PHY_INTERFACE_MODE_RGMII. There > is no reason not to follow ever other MAC/PHY pair and have the PHY add the > delay. The MAC can then do fine tuning if needed, adding small delays. Thank you for your reply and information. We will discuss internal and modify in next version. Thanks, Jacky
