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

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Date:   Fri, 12 May 2023 18:22:21 +0800
From:   Minda Chen <minda.chen@...rfivetech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Roger Quadros <rogerq@...nel.org>,
        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 2023/5/11 22:49, 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.
> 
> Best regards,
> Krzysztof
> 

I can change like these. Are these changes can be approved?
lpm , bus clock and "pwrup" reset can be specific cases. (The changes are from snps,dwc3.yaml.)

  clocks:
    description:
      In general the core supports two types of clocks. bus is a SoC Bus
      Clock(AHB/AXI/APB). lpm is a link power management clock. But particular
      cases may differ from that having less or more clock sources with
      another names.

  clock-names:
    contains:
      anyOf:
        - enum: [bus, lpm]
        - true

  resets:
    description:
      In general the core supports controller power-up reset. Also clock and
      other resets can be added. Particular cases may differ from that having
      less or more resets with another names.

  reset-names:
    contains:
      anyOf:
        - const: pwrup
        - true