linux-kernel - Re: [PATCH v6 1/6] can: dev: Add support for limiting configured bitrate

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Message-ID: <8d973da8-df40-e37e-377f-50666db382fe@pengutronix.de>
Date:   Tue, 2 Jan 2018 17:15:57 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Faiz Abbas <faiz_abbas@...com>, wg@...ndegger.com,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        nsekhar@...com, fcooper@...com, robh@...nel.org,
        Wenyou.Yang@...rochip.com, sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH v6 1/6] can: dev: Add support for limiting configured
 bitrate

On 12/22/2017 02:31 PM, Faiz Abbas wrote:
> From: Franklin S Cooper Jr <fcooper@...com>
> 
> Various CAN or CAN-FD IP may be able to run at a faster rate than
> what the transceiver the CAN node is connected to. This can lead to
> unexpected errors. However, CAN transceivers typically have fixed
> limitations and provide no means to discover these limitations at
> runtime. Therefore, add support for a can-transceiver node that
> can be reused by other CAN peripheral drivers to determine for both
> CAN and CAN-FD what the max bitrate that can be used. If the user
> tries to configure CAN to pass these maximum bitrates it will throw
> an error.

Please add support to read the maximum bitrate via netlink. Have a look
at 12a6075cabc0 ("can: dev: add CAN interface termination API"). I think
you need to extend the following functions: can_get_size() and
can_fill_info().

Marc

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Pengutronix e.K.                  | Marc Kleine-Budde           |
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