Re: [PATCH v3 net-next 00/17] PTP support for the SJA1105 DSA driver

From: Richard Cochran
Date: Thu Jun 06 2019 - 23:36:58 EST

On Thu, Jun 06, 2019 at 04:40:19PM +0300, Vladimir Oltean wrote:
> Plain and simply because it doesn't work very well.
> Even phc2sys from the system clock to the hardware (no timestamps
> involved) has trouble staying put (under 1000 ns offset).
> And using the hardware-corrected timestamps triggers a lot of clockchecks.

It sounds like a bug in reading or adjusting the HW clock. Is the HW
clock stable when you don't adjust its frequency?