linux-kernel - Re: [PATCH 1/2] dt-bindings: remoteproc: mediatek: Fix optional reg-names for mtk,scp

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Date:   Tue, 3 May 2022 14:26:15 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     kernel@...labora.com,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: remoteproc: mediatek: Fix optional
 reg-names for mtk,scp

Il 03/05/22 14:19, Krzysztof Kozlowski ha scritto:
> On 29/04/2022 23:11, Nícolas F. R. A. Prado wrote:
>> The SCP has three memory regions: sram, l1tcm and cfg. Only sram is
>> required, the other two are optional. Fix the dt-binding so that the
>> optional regions can be omitted and passed in any order.
> 
> No, cannot be passed in any order.
> 
>>
>> Also add the missing minItems to the reg property and update the
>> description.
>>
>> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
>>
>> ---
>>
>>   .../devicetree/bindings/remoteproc/mtk,scp.yaml      | 12 +++++++++---
>>   1 file changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
>> index 823a236242de..ec9ddeb6ca2c 100644
>> --- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
>> +++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
>> @@ -24,14 +24,20 @@ properties:
>>     reg:
>>       description:
>>         Should contain the address ranges for memory regions SRAM, CFG, and
>> -      L1TCM.
>> +      L1TCM. Only SRAM is required, while CFG and L1TCM are optional.
>> +    minItems: 1
>>       maxItems: 3
>>   
>>     reg-names:
>> +    minItems: 1
>>       items:
>>         - const: sram
>> -      - const: cfg
>> -      - const: l1tcm
>> +      - enum:
>> +          - l1tcm
>> +          - cfg
>> +      - enum:
>> +          - l1tcm
>> +          - cfg
> 
> This allows them in any combination which is not what we want. If both
> are optional and both can appear, then last should be a const:l1tcm.
> 
> Best regards,
> Krzysztof

Nicolas, I think that you weren't clear about what you're trying to solve with this
commit in the description.

I remember you had this kind of instance, but I don't really remember if it was
about mtk,scp or (and?) something else.... so.... are you trying to fix issues
with devicetrees declaring

	reg-names = "sram", "l1tcm"; ?

Was this giving dtbs_check errors?

Cheers,
Angelo