We are much more strict about this now than before. You have to use
    standard units and convert to hardware values. It also makes it a lot
    easier for DT writers, if they have an idea what the units mean.

    Having the MAC add small delays is something you can add later,
    without breaking backwards compatibility. So if you cannot determine
    what the units are now, just submit the glue driver without support
    for this feature. If anybody really needs it, they can do the needed
    research, maybe do some measurements, and then add the code.


I did an experiment, when the tx delay is not set, RGMII works a

You had rgmii-id in your device tree, so that the PHY added the
delays?

	Andrew