linux-kernel - Re: [PATCH 1/2] dt-bindings: iio: adc: rtq6056: add support for the whole RTQ6056 family

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Date: Thu, 28 Dec 2023 08:09:35 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: ChiYuan Huang <cy_huang@...htek.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
 Rob Herring <robh+dt@...nel.org>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: iio: adc: rtq6056: add support for the
 whole RTQ6056 family

On 28/12/2023 04:19, ChiYuan Huang wrote:
> On Tue, Dec 26, 2023 at 01:12:50PM +0100, Krzysztof Kozlowski wrote:
>> On 26/12/2023 12:19, ChiYuan Huang wrote:
>>> On Tue, Dec 26, 2023 at 10:18:47AM +0100, Krzysztof Kozlowski wrote:
>>>> On 26/12/2023 04:47, cy_huang@...htek.com wrote:
>>>>> From: ChiYuan Huang <cy_huang@...htek.com>
>>>>>
>>>>> Add compatible support for RTQ6053 and RTQ6059.
>>>>>
>>>>> Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
>>>>> ---
>>>>>  .../devicetree/bindings/iio/adc/richtek,rtq6056.yaml         | 5 ++++-
>>>>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/iio/adc/richtek,rtq6056.yaml b/Documentation/devicetree/bindings/iio/adc/richtek,rtq6056.yaml
>>>>> index 88e008629ea8..d1e1f36d1972 100644
>>>>> --- a/Documentation/devicetree/bindings/iio/adc/richtek,rtq6056.yaml
>>>>> +++ b/Documentation/devicetree/bindings/iio/adc/richtek,rtq6056.yaml
>>>>> @@ -25,7 +25,10 @@ description: |
>>>>>  
>>>>>  properties:
>>>>>    compatible:
>>>>> -    const: richtek,rtq6056
>>>>> +    enum:
>>>>> +      - richtek,rtq6053
>>>>> +      - richtek,rtq6056
>>>>
>>>> Aren't these devices compatible? Your driver change says they are, so
>>>> express compatibility with list here (and oneOf).
>>>>
>>> Thanks, I try to take other binding as the reference. One more question.
>>> If rtq6053 is compatible with rtq6056, there's only chip package type difference.
>>> Do I need to seperate it into a dedicated enum element?
>>> Or just put it into one item and said this part number is compatible with rtq6056? 
>>
>> See example-schema. You need enum and items, both in oneOf:.
>>
> After reading the 'example-schema', I Still cannot understand what the special case items
> means.

What is "special case items"?

> 
> But in my case, is the below change correct?
> [Diff]
> properties:
>    compatible:
> -    enum:
> -      - richtek,rtq6053
> -      - richtek,rtq6056
> -      - richtek,rtq6059
> +    oneOf:
> +      - items:
> +          - enum:
> +              - richtek,rtq6053
> +              - richtek,rtq6056
> +              - richtek,rtq6059

This changes nothing, you still have just one item. The example-schema
has exactly that case, so why you are coding it differently?

Anyway, test your DTS with the fallback, you will see that above does
not work.

Best regards,
Krzysztof