linux-kernel - Re: [PATCH v3 2/3] can: etas_es58x: export firmware, bootloader and hardware versions in sysfs

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Message-ID: <Y3VwQdZoStfryz3q@x130.lan>
Date:   Wed, 16 Nov 2022 15:20:33 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v3 2/3] can: etas_es58x: export firmware, bootloader and
 hardware versions in sysfs

On 16 Nov 09:36, Vincent MAILHOL wrote:
>On Wed. 16 Nov. 2022 at 07:50, Saeed Mahameed <saeed@...nel.org> wrote:
>> On 13 Nov 13:01, Vincent Mailhol wrote:
>> >ES58x devices report below information in their usb product info
>> >string:
>> >
>> >  * the firmware version
>> >  * the bootloader version
>> >  * the hardware revision
>> >
>> >Parse this string, store the results in struct es58x_dev and create
>> >three new sysfs entries.
>> >
>>
>> will this be the /sys/class/net/XXX sysfs  ?
>
>I am dropping the idea of using sysfs and I am now considering using
>devlink following Andrew's message:
>https://lore.kernel.org/linux-can/Y3Ef4K5lbilY3EQT@lunn.ch/
>

+1

>> We try to avoid adding device specific entries in there,
>>
>> Couldn't you just squeeze the firmware and hw version into the
>> ethtool->drvinfo->fw_version
>>
>> something like:
>> fw_version: %3u.%3u.%3u (%c.%3u.%3u)
>
>This looks like a hack. There is no way for the end user to know, just
>from the ethtool output, what these in brackets values would mean.

it's not, there is no well defined format for what to put in the version,
as long as it clearly describes what FW is currently running.
at the end of the day, it's just a text you copy&paste when you contact
customer support.

>
>> and bootloader into ethtool->drvinfo->erom_version:
>>   * @erom_version: Expansion ROM version string; may be an empty string
>
>Same. I considered doing this in the early draft of this series and
>dropped the idea because an expansion ROM and a boot loader are two
>things different.
>
>I will continue to study devlink and only use the drvinfo only for the
>firmware version.
>

100% devlink is a great options.