Re: [PATCH v2 06/13] dt-bindings: serial: atmel,at91-usart: Add SAM9260 compatibles to SAM9x60

[<Sergiu.Moga@microchip.com>]

On 13.09.2022 12:30, Krzysztof Kozlowski wrote:
> On 13/09/2022 11:19, Sergiu.Moga@microchip.com wrote:
>>>
>>> Let me rephrase it:
>>>
>>> What your commit is doing is requiring additional fallback compatibles.
>>> Therefore the commit msg should answer - why do you require additional
>>> fallback compatibles?
>>>
>>
>>
>> The additional fallback compatibles are required because the driver in
>> question only knows about the atmel,at91sam9260-usart compatible.
>> Furthermore, it is also a better representation of the fact that the
>> serial IP of 9x60 is an improvement over the serial IP of 9260 (it
>> contains more hardware features not yet implemented in the driver).
>>
>>
>>> Incremental characteristics sound to me optional. I can increment
>>> sam9x60 with something or I can skip it. But you are not doing it...
>>> sam9x60 was already there and now you require a fallback.
>>>
>>> Best regards,
>>> Krzysztof
>>
>> So, what is your opinion on the following commit message:
>>
>> "Fix sam9x60 compatible list by adding the sam9260 compatibles as
>> fallback, since the atmel_serial driver only knows of the latter's
>> compatible. The atmel_serial driver only has knowledge of the sam9260
>> compatible because it does not have the sam9x60's serial IP specific
>> features implemented yet and adding an empty compatible without adding
>> support specific to that compatible would be misleading. Thus prefer the
>> fallback mechanism in the detriment of adding an empty compatible in the
>> driver."
> 
> It's fine. Also could work:
> 
> "Require sam9260 fallback compatible for sam9x60, because sam9x60 is
> fully compatible with sam9260 and Linux driver requires the latter."
> 


This version looks better indeed. Sums it all up and is only 2 lines :). 
Thank you very much for the suggestion it is greatly appeciated.


> If it fixes any observable issue like lack of driver binding to DTS, you
> can also mention that.
> 
> Best regards,
> Krzysztof


Thanks,
	Sergiu