linux-kernel - Re: [PATCH v2 1/9] dt-bindings: arm-smmu: Allow up to 3 power-domains

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Date:   Mon, 14 Nov 2022 12:17:20 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org
Cc:     patches@...aro.org, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/9] dt-bindings: arm-smmu: Allow up to 3 power-domains


On 14/11/2022 12:01, Krzysztof Kozlowski wrote:
> On 14/11/2022 11:42, Konrad Dybcio wrote:
>> Some SMMUs require that a vote is held on as much as 3 separate PDs
>> (hello Qualcomm). Allow it in bindings.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>> Changes since v1:
>> - Add minItems
>>
>>   Documentation/devicetree/bindings/iommu/arm,smmu.yaml | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
>> index 9066e6df1ba1..82bc696de662 100644
>> --- a/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
>> +++ b/Documentation/devicetree/bindings/iommu/arm,smmu.yaml
>> @@ -159,7 +159,8 @@ properties:
>>             through the TCU's programming interface.
>>   
>>     power-domains:
>> -    maxItems: 1
>> +    minItems: 0
> It cannot be 0.
>
> minItems: 1
>
> Anyway you still need to restrict it per variant, as I said in previous
> version.

Hm.. I'm not entirely sure what you mean.. Should I add a list of 
compatibles
that are allowed to have 3 power-domains and leave it as it was before 
in the
'else' case?


Konrad

>
> Best regards,
> Krzysztof
>