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

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Date:   Sat, 7 May 2022 18:33:31 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     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>,
        Tzung-Bi Shih <tzungbi@...gle.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 06/05/2022 23:32, Nícolas F. R. A. Prado wrote:
> Commit ca23ecfdbd44 ("remoteproc/mediatek: support L1TCM") added support
> for the l1tcm memory region on the MT8192 SCP, adding a new da_to_va
> callback that handles l1tcm while keeping the old one for
> back-compatibility with MT8183. However, since the mt8192 compatible was
> missing from the dt-binding, the accompanying dt-binding commit
> 503c64cc42f1 ("dt-bindings: remoteproc: mediatek: add L1TCM memory region")
> mistakenly added this reg as if it were for mt8183. And later
> it became common to all platforms as their compatibles were added.
> 
> Fix the dt-binding so that the l1tcm reg can, and must, be present only
> on the supported platforms: mt8192 and mt8195.
> 
> Fixes: 503c64cc42f1 ("dt-bindings: remoteproc: mediatek: add L1TCM memory region")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> 
> ---
> The if:then: branches became rather long since it seems that it's not
> possible to override the properties in them, only add new ones. That is,
> I couldn't leave the items definition for all three regs in the global
> reg-names and just decrease minItems and maxItems to 2 for
> mt8183/mt8186.
> 
> Also I had to add a description to the global reg-names, since it
> couldn't be neither missing nor empty.

It is possible:
https://elixir.bootlin.com/linux/latest/source/Documentation/devicetree/bindings/example-schema.yaml#L91

Keep constraints and list of names in properties. Then in allOf:if:then
raise minItems or lower maxItems, depending on the variant.


Best regards,
Krzysztof