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

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Date:   Fri, 12 May 2023 14:08:29 +0300
From:   Roger Quadros <rogerq@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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 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.

-- 
cheers,
-roger