linux-kernel - Re: [PATCH 1/9] dt-bindings: gpu: mali-bifrost: Don't allow sram-supply by default

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Date:   Thu, 9 Feb 2023 10:50:18 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     airlied@...il.com, tomeu.vizoso@...labora.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, steven.price@....com,
        robh+dt@...nel.org, linux-mediatek@...ts.infradead.org,
        alyssa.rosenzweig@...labora.com, krzysztof.kozlowski+dt@...aro.org,
        matthias.bgg@...il.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/9] dt-bindings: gpu: mali-bifrost: Don't allow
 sram-supply by default

On Wed, Feb 8, 2023 at 6:37 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> The sram-supply is MediaTek-specific, it is and will ever be used
> only for the mediatek,mt8183-mali compatible due to the addition of
> the mediatek-regulator-coupler driver: change the binding to add
> this supply when mediatek,mt8183-mali is present as a compatible
> instead of disabling it when not present.
>
> This is done in preparation for adding new bindings for other
> MediaTek SoCs, such as MT8192 and others.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> index 78964c140b46..69212f3b1328 100644
> --- a/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> +++ b/Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml
> @@ -57,8 +57,6 @@ properties:
>
>    mali-supply: true
>
> -  sram-supply: true
> -

Have you tried actually validating the device trees against this?
Based on my previous tests this gives out errors.

The reason is that each conditional is a separate sub-schema, and the
validator is run against each schema and sub-schema separately, instead
of collapsing matching schemas and sub-schemas together and validating
once. So we'll get a validation error on sram-supply not being a valid
property when validating current mt8183 against the base schema.

We have a similar issue with power-domain-names, for which I'll send
a patch to fix. See the following for the fix:

    http://git.kernel.org/wens/c/d1adb38ab2ad0442755607c2bcc726cc17cce2c7

and the following for what I did for MT8192 on top of the previous patch:

    http://git.kernel.org/wens/c/049bd164884398d7e5f72c710da6aaa9a95bc10a


Regards
ChenYu

>    operating-points-v2: true
>
>    power-domains:
> @@ -157,6 +155,7 @@ allOf:
>              - const: core0
>              - const: core1
>              - const: core2
> +        sram-supply: true
>
>        required:
>          - sram-supply
> @@ -166,7 +165,6 @@ allOf:
>        properties:
>          power-domains:
>            maxItems: 1
> -        sram-supply: false
>    - if:
>        properties:
>          compatible:
> --
> 2.39.1
>