linux-kernel - Re: [PATCH] Expose Peak USB device id in sysfs via phys_port

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Message-ID: <20210721155240.57887e6c@gmail.com>
Date:   Wed, 21 Jul 2021 15:52:40 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Andre Naujoks <nautsch2@...il.com>
Cc:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Stephane Grosjean <s.grosjean@...k-system.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Colin Ian King <colin.king@...onical.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Expose Peak USB device id in sysfs via phys_port_name.

On Wed, 21 Jul 2021 14:40:47 +0200
Andre Naujoks <nautsch2@...il.com> wrote:

> The Peak USB CAN adapters can be assigned a device id via the Peak
> provided tools (pcan-settings). This id can currently not be set by
> the upstream kernel drivers, but some devices expose this id already.
> 
> The id can be used for consistent naming of CAN interfaces regardless
> of order of attachment or recognition on the system. The classical
> CAN Peak USB adapters expose this id via bcdDevice (combined with
> another value) on USB-level in the sysfs tree and this value is then
> available in ID_REVISION from udev. This is not a feasible approach,
> when a single USB device offers more than one CAN-interface, like
> e.g. the PCAN-USB Pro FD devices.
> 
> This patch exposes those ids via the, up to now unused, netdevice
> sysfs attribute phys_port_name as a simple decimal ASCII
> representation of the id. phys_port_id was not used, since the
> default print functions from net/core/net-sysfs.c output a
> hex-encoded binary value, which is overkill for a one-byte device id,
> like this one.


Hi, Andre!

You should add Signed-off-by tag to the patch


With regards,
Pavel Skripkin