linux-kernel - Re: [PATCH v2 1/2] dt-bindings: cdns,usb3: Add clock and reset

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Date:   Sat, 13 May 2023 20:43:41 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Roger Quadros <rogerq@...nel.org>,
        Minda Chen <minda.chen@...rfivetech.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <peter.chen@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: cdns,usb3: Add clock and reset

On 12/05/2023 13:08, Roger Quadros wrote:
> 
> 
> On 11/05/2023 17:49, Krzysztof Kozlowski wrote:
>> On 11/05/2023 14:16, Roger Quadros wrote:
>>>
>>>
>>> On 11/05/2023 12:26, Krzysztof Kozlowski wrote:
>>>> On 10/05/2023 15:28, Minda Chen wrote:
>>>>> To support generic clock and reset init in Cadence USBSS
>>>>> controller, add clock and reset dts configuration.
>>>>>
>>>>> Signed-off-by: Minda Chen <minda.chen@...rfivetech.com>
>>>>> ---
>>>>>  .../devicetree/bindings/usb/cdns,usb3.yaml         | 14 ++++++++++++++
>>>>>  1 file changed, 14 insertions(+)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/usb/cdns,usb3.yaml b/Documentation/devicetree/bindings/usb/cdns,usb3.yaml
>>>>> index cae46c4982ad..623c6b34dee3 100644
>>>>> --- a/Documentation/devicetree/bindings/usb/cdns,usb3.yaml
>>>>> +++ b/Documentation/devicetree/bindings/usb/cdns,usb3.yaml
>>>>> @@ -42,6 +42,18 @@ properties:
>>>>>        - const: otg
>>>>>        - const: wakeup
>>>>>  
>>>>> +  clocks:
>>>>> +    minItems: 1
>>>>> +    maxItems: 8
>>>>> +    description:
>>>>> +      USB controller clocks.
>>>>
>>>> You need to list the items. And why is it variable? Your clock choice in
>>>> the example is poor, I doubt it is real.
>>>>
>>>>> +
>>>>> +  resets:
>>>>> +    minItems: 1
>>>>> +    maxItems: 8
>>>>> +    description:
>>>>> +      USB controller generic resets.
>>>>
>>>> Here as well.
>>>>
>>>> You had one clock last time, thus the review was - drop the names. Now
>>>> you changed it to 8 clocks... I don't understand.
>>>>
>>>
>>> Different platforms may have different number of clocks/resets or none.
>>> So I don't think minItems/maxItems should be specified.
>>
>> Yeah, but we want the clocks to be specific per platform. Not anything
>> anywhere.
>>
> 
> Agreed. So we don't specify min/maxItems at top level but use conditional
> constraints per platform?
> Which means we will need to add platform specific compatibles as well.

Yes, exactly. This can be done here in this binding or through some
re-usable common part and then multiple bindings using it and customizing.

Best regards,
Krzysztof