linux-kernel - Re: [PATCH v2 5/5] dt-bindings: phy: uniphier: Clean up clock-names and reset-names using compatible string

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Date:   Wed, 30 Mar 2022 11:45:16 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] dt-bindings: phy: uniphier: Clean up clock-names
 and reset-names using compatible string

On 30/03/2022 11:16, Kunihiko Hayashi wrote:
> Hi Krzysztof,
> 
> On 2022/03/30 17:13, Krzysztof Kozlowski wrote:
>> On 30/03/2022 07:20, Kunihiko Hayashi wrote:
>>> Instead of "oneOf:" choices, use "allOf:" and "if:" to define clock-names
>>> and reset-names that can be taken by the compatible string.
>>>
>>> The order of clock-names and reset-names doesn't change here.
>>>
>>> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
>>> ---
>>>   .../phy/socionext,uniphier-ahci-phy.yaml      | 73 ++++++++++++------
>>>   .../phy/socionext,uniphier-pcie-phy.yaml      | 37 ++++++---
>>>   .../phy/socionext,uniphier-usb3hs-phy.yaml    | 75 +++++++++++++-----
>>>   .../phy/socionext,uniphier-usb3ss-phy.yaml    | 77 ++++++++++++++-----
>>>   4 files changed, 188 insertions(+), 74 deletions(-)
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/phy/socionext,uniphier-ahci-phy.yaml
>>> b/Documentation/devicetree/bindings/phy/socionext,uniphier-ahci-phy.yaml
>>> index 14f7579e7daa..61d9306e1852 100644
>>> ---
>>> a/Documentation/devicetree/bindings/phy/socionext,uniphier-ahci-phy.yaml
>>> +++
>>> b/Documentation/devicetree/bindings/phy/socionext,uniphier-ahci-phy.yaml
>>> @@ -30,33 +30,62 @@ properties:
>>>       minItems: 1
>>>       maxItems: 2
>>>
>>> -  clock-names:
>>> -    oneOf:
>>> -      - items:          # for PXs2
>>> -          - const: link
>>> -      - items:          # for Pro4
>>> -          - const: link
>>> -          - const: gio
>>> -      - items:          # for others
>>> -          - const: link
>>> -          - const: phy
>>> +  clock-names: true
>>>
>>>     resets:
>>>       minItems: 2
>>>       maxItems: 6
>>>
>>> -  reset-names:
>>> -    oneOf:
>>> -      - items:          # for Pro4
>>> -          - const: link
>>> -          - const: gio
>>> -          - const: phy
>>> -          - const: pm
>>> -          - const: tx
>>> -          - const: rx
>>> -      - items:          # for others
>>> -          - const: link
>>> -          - const: phy
>>> +  reset-names: true
>>> +
>>> +allOf:
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          contains:
>>> +            const: socionext,uniphier-pro4-ahci-phy
>>> +    then:
>>> +      properties:
>>> +        clock-names:
>>> +          items:
>>> +            - const: link
>>> +            - const: gio
>>> +        reset-names:
>>> +          items:
>>> +            - const: link
>>> +            - const: gio
>>> +            - const: phy
>>> +            - const: pm
>>> +            - const: tx
>>> +            - const: rx
>>
>> Constrain also everywhere clocks and resets, so here should be:
>>    resets:
>>      minItems: 6
>>      maxItems: 6
> 
> If I put the constraint here, it would conflict with the original one.
> Should I also replace the original resets
> 
>      resets:
>        minItems: 2
>        maxItems: 6
> 
> with "resets: true"?

It should not conflict. Check the bindings for Samsung Exynos clock I
sent you last time. In the main "properties" you put the widest
constraints, like you have now (2-6). Then for each compatible you
narrow it (2-2, 6-6).

You can later test it by adding/removing clocks to check if constraints
are properly working.


Best regards,
Krzysztof