linux-kernel - Re: [RFC PATCH v3 8/9] can: slcan: add support to set bit time register (btr)

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Date:   Wed, 27 Jul 2022 20:23:50 +0200
From:   Dario Binacchi <dario.binacchi@...rulasolutions.com>
To:     Max Staudt <max@...as.org>
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org, linux-can@...r.kernel.org,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        michael@...rulasolutions.com,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        Jeroen Hofstee <jhofstee@...tronenergy.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        netdev@...r.kernel.org,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>
Subject: Re: [RFC PATCH v3 8/9] can: slcan: add support to set bit time
 register (btr)

Hello Marc and Max,

On Wed, Jul 27, 2022 at 7:33 PM Max Staudt <max@...as.org> wrote:
>
> On Wed, 27 Jul 2022 19:28:45 +0200
> Dario Binacchi <dario.binacchi@...rulasolutions.com> wrote:
>
> > On Wed, Jul 27, 2022 at 7:21 PM Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> > >
> > > Ok - We avoided writing bit timing registers from user space into the
> > > hardware for all existing drivers. If there isn't a specific use case,
> > > let's skip this patch. If someone comes up with a use case we can think
> > > of a proper solution.
> >
> > Ok. So do I also remove the 7/9 "ethtool: add support to get/set CAN
> > bit time register"
> > patch ?
>
> If I may answer as well - IMHO, yes.
>
> Unless we know that BTR is something other than just a different way to
> express the bitrate, I'd skip it, yes. Because bitrate is already
> handled by other, cross-device mechanisms.

Thanks to both of you for the explanations.
Regards,

Dario

>
>
> Max

-- 

Dario Binacchi

Embedded Linux Developer

dario.binacchi@...rulasolutions.com

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