linux-kernel - Re: [PATCH v4 1/2] dt-bindings: remoteproc: mediatek: Make l1tcm reg exclusive to mt819x

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Date:   Mon, 9 May 2022 11:05:17 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     Tzung-Bi Shih <tzungbi@...gle.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, 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 v4 1/2] dt-bindings: remoteproc: mediatek: Make l1tcm reg
 exclusive to mt819x

On Mon, May 09, 2022 at 10:27:18AM +0800, Tzung-Bi Shih wrote:
> On Sat, May 7, 2022 at 5:32 AM Nícolas F. R. A. Prado
> <nfraprado@...labora.com> wrote:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          enum:
> > +            - mediatek,mt8192-scp
> > +            - mediatek,mt8195-scp
> > +    then:
> > +      properties:
> > +        reg:
> > +          minItems: 3
> > +          maxItems: 3
> > +        reg-names:
> > +          items:
> > +            - const: sram
> > +            - const: cfg
> > +            - const: l1tcm
> 
> "l1tcm" should be optional.  Does it make more sense by using "minItems: 2"?

Hi Tzung-Bi,

thank you for the information. I did notice from the driver code that l1tcm was
treated as optional for mt8192, but since I wasn't sure if that was intended, I
kept it as required for the mt8192/mt8195 binding, since making it optional
later wouldn't break the ABI, but the opposite would.

But yes, since it is indeed optional for those platforms, I will lower minItems
to 2 for them in the next version.

Thanks,
Nícolas