On Thu, Oct 22, 2020 at 02:39:35AM +0300, Vladimir Oltean wrote:

So how _does_ that work for TI PHYTER?

As far as we understand, the PHYTER appears to autonomously mangle PTP packets
in the following way:
- subtracting t2 on RX from the correctionField of the Pdelay_Req
- adding t3 on TX to the correctionField of the Pdelay_Resp

The Phyter does not support peer-to-peer one step.

The only driver that implements it is ptp_ines.c.

And *that* driver/HW implements it correctly.

Thanks,
Richard