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Date:   Tue, 12 Jan 2021 15:38:33 +0900
From:   Vincent MAILHOL <>
To:     Richard Cochran <>
Cc:     Marc Kleine-Budde <>,
        linux-can <>,
        Jeroen Hofstee <>,
        Wolfgang Grandegger <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        "open list:NETWORKING DRIVERS" <>,
        open list <>
Subject: Re: [PATCH v3 1/1] can: dev: add software tx timestamps

On Tue. 12 Jan 2021 at 11:14, Richard Cochran <> wrote:
> On Tue, Jan 12, 2021 at 09:00:33AM +0900, Vincent MAILHOL wrote:
> > Out of curiosity, which programs do you use? I guess wireshark
> > but please let me know if you use any other programs (I just use
> > to write a small C program to do the stuff).
> I was thinking of PTP over DeviceNET (which, in turn, is over CAN).
> This is specified in Annex G of IEEE 1588.
> The linuxptp stack has modular design and could one day support
> DeviceNET.  It would be much easier for linuxptp if CAN interfaces
> support hardware time stamping in the same way as other network
> interfaces.

I actually also thought of implementing PTP but for a slightly
different goal: synchronise the clock of the different CAN
controllers connected to a same Linux host. But so far, it is
just a rough idea and I never looked really deep into the
technical details of linuxptp.

However, I did not know about DeviceNET. I am not really aware of
the use cases for industrial automation applications.

Glad to have asked, learnt something :)

Yours sincerely,

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