Re: [PATCH spi for-5.4 0/5] Deterministic SPI latency with NXP DSPI driver

On Thu, Aug 22, 2019 at 07:13:12PM +0300, Vladimir Oltean wrote:

You do think that I understand the problem? But I don't!

;^)

quoted

And who generates Local_sync_resp?

Local_sync_resp is the same as Local_sync_req except maybe with a
custom tag added by the switch. Irrelevant as long as the DSA master
can timestamp it.

So this is point why it won't work.  The time stamping logic in the
switch only recognizes PTP frames.
 
Thanks,
Richard