Re: [PATCH v2 2/2] gpio: aggregator: add gpio-aggregator DT compatible

[Krzysztof Kozlowski]

On 11/02/2026 11:42, Krzysztof Kozlowski wrote:
> On 11/02/2026 11:36, Bartosz Golaszewski wrote:
>> On Wed, Feb 11, 2026 at 11:13 AM Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:
>>>
>>>>>
>>>>>  static const struct of_device_id gpio_aggregator_dt_ids[] = {
>>>>> +       {
>>>>> +               .compatible = "gpio-aggregator",
>>>>> +       },
>>>>>         {
>>>>>                 .compatible = "gpio-delay",
>>>>>                 .data = (void *)FWD_FEATURE_DELAY,
>>>>> --
>>>>> 2.43.0
>>>>>
>>>>
>>>> Regardless of the DT bindings - this change is perfectly fine. We do
>>>
>>> You cannot have compatible without DT bindings, so this alone is not
>>> "perfectly fine". Maybe you wanted platform_device_id entry for
>>> ACPI/legacy/MFD devices?
>>>
>>
>> Sure you can, you just can't put it into upstream devicetree sources.
> 
> No, you cannot. You cannot have undocumented ABI. That's the rule and
> upstream DTS does not matter. ABI is also for non-upstream users.
> 
>> We have had a compatible for gpio-sim for testing purposes for years.
> 
> And I fixed in it 2024...

Correction:
I fixed other compatibles but gpio-sim was fixed actually by Rob, still
in 2024.

> 
>> Why would it be illegal to enable matching of platform drivers over DT
>> for testing purposes?
> 
> You can match. You cannot have undocumented ABI. This is the rule.
> 
> Best regards,
> Krzysztof


Best regards,
Krzysztof