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

[Heiko Schocher]

Hello Jonathan,

On 22.07.25 12:20, Jonathan Cameron wrote:
> On Mon, 21 Jul 2025 21:58:10 -0700
> Guenter Roeck <linux at roeck-us.net> wrote:
> 
>> On 7/21/25 21:05, 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...
>>>
>>> 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"
>>>
>>> which makes it clearer, that only ABB trivial sensor, controlled through spidev
>>> driver, is connected here?
>>>    
>>
>> FWIW, I always thought that devicetree is not supposed to contain such generic
>> information. Is it even appropriate to list something like this in devicetree
>> in the first place ?
>>
>> If so, what prevents anyone from submitting hundreds of
>> "<company>,spidev-trivial-<device-type>" entries, using the same line of argument ?
> 
> Agreed.  These should have separate compatibles based on what any OS etc
> might want to bind to them.  Just because their model in Linux is spidev etc
> that shouldn't mean a generic ID is appropriate.
> 
> Can we at least have some examples to motivate the discussion?

I am sorry, I get no more information about the sensors... even I do
not know the count of variants. What I can say is, that this sensors
measure gases, and are only used "internal" on the aristainetos3 carriers.

So a proposal would be:

# ABB gas sensor on aristainetos3 carriers
compatible "abb,aristainetos-gas-sensor"

bye,
Heiko
> Jonathan
> 
>>
>> Guenter
>>

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