linux-kernel - Re: (subset) [PATCH v1 0/3] spidev: introduce trivial abb sensor device

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Message-ID: <07ac9244-c4cb-441e-83c1-20dfd01b2fe7@kernel.org>
Date: Tue, 22 Jul 2025 13:07:40 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: hs@...x.de, Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Andrei Lalaev <andrey.lalaev@...il.com>,
 Chanh Nguyen <chanh@...amperecomputing.com>,
 Conor Dooley <conor+dt@...nel.org>, Fabio Estevam <festevam@...il.com>,
 Grant Peltier <grantpeltier93@...il.com>, Guenter Roeck
 <linux@...ck-us.net>, Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Michal Simek <michal.simek@....com>,
 Naresh Solanki <naresh.solanki@...ements.com>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Rob Herring <robh@...nel.org>, Rodrigo Gobbi <rodrigo.gobbi.7@...il.com>,
 Sascha Hauer <s.hauer@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: (subset) [PATCH v1 0/3] spidev: introduce trivial abb sensor
 device

On 22/07/2025 06:05, Heiko Schocher wrote:
> Hello Krzysztof,
> 
> On 21.07.25 18:24, Krzysztof Kozlowski wrote:
>> On 21/07/2025 17:56, Mark Brown wrote:
>>> On Sat, 19 Jul 2025 08:33:51 +0200, Heiko Schocher wrote:
>>>> This series introduces the changes needed for trivial spi
>>>> based sensors from ABB, currently operated from userspace.
>>>>
>>>> The last patch adds the spidevices to the DTS files, already
>>>> in mainline.
>>>>
>>>> make dtbs_check showed no errors/warnings for the dts files
>>>>
>>>> [...]
>>>
>>> Applied to
>>>
>>>     https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
>>>
>>> Thanks!
>>>
>>> [1/3] dt-bindings: trivial-devices: Document ABB sensors
>>>        commit: aad2f87cbcab56b322109d26d7b11842a09df91f
>>> [2/3] spi: spidev: Add an entry for the ABB spi sensors
>>>        commit: d60f7cab7c04944a79af16caa43c141e780a59c6
>>>
>>
>>
>> That's unexpected, Mark. Patches received two objections/comments and I
>> don't think discussion was resolved.
>>
>> ABB is huge company, probably making hundreds or more of sensors. The
>> patchset basically claims that all of them work with spidev. It does not
>> providing any model names or details, so it seems really incomplete to
>> call them trivial devices.
> 
> I do not know how many different sensors they have, nor if that department can
> speak for the whole company...

Considering how big company is, they could have 1 or 1000 sensors.

> 
> What I have as information is:
> https://lore.kernel.org/linux-spi/2477dc64-92a0-9dc9-d168-56646d0d796e@denx.de/
> 
> and I get no more information about them currently. May I should
> add some sort of trivial into compatible name? Something like
> 
> "abb,spi-trivial-sensor"
> or
> "abb,spidev-trivial-sensor"

No, you need model numbers.

> 
> which makes it clearer, that only ABB trivial sensor, controlled through spidev
> driver, is connected here?

No, what is trivial? Which one is trivial and which one is not? How one
judges that one sensor should go here and other should not?


Best regards,
Krzysztof