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

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Date:   Thu, 22 Aug 2019 22:22:17 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Hubert Feurstein <h.feurstein@...il.com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-spi@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: 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!

;^)

> > 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