linux-kernel - Re: [PATCH 1/2] dt-bindings: pinctrl: mediatek: deprecate custom drive strength property

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Date:   Tue, 28 Mar 2023 15:41:48 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Alexandre Mergnat <amergnat@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Zhiyong Tao <zhiyong.tao@...iatek.com>,
        Bernhard Rosenkränzer <bero@...libre.com>
Cc:     linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: mediatek: deprecate custom
 drive strength property

Il 28/03/23 15:06, Alexandre Mergnat ha scritto:
> Deprecate mediatek,drive-strength-adv which shall not exist, that was an
> unnecessary property that leaked upstream from downstream kernels and
> there's no reason to use it.
> 
> The generic property drive-strength-microamp should be used instead.
> 
> Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>
> ---
>   .../devicetree/bindings/pinctrl/mediatek,mt8183-pinctrl.yaml      | 8 ++++++--
>   .../devicetree/bindings/pinctrl/mediatek,mt8365-pinctrl.yaml      | 6 +++++-
>   2 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/mediatek,mt8183-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/mediatek,mt8183-pinctrl.yaml
> index c30cd0d010dd..b82a066b91ec 100644
> --- a/Documentation/devicetree/bindings/pinctrl/mediatek,mt8183-pinctrl.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/mediatek,mt8183-pinctrl.yaml

Thanks for doing MT8183!!!

> @@ -110,8 +110,13 @@ patternProperties:
>             drive-strength:

..snip..

> diff --git a/Documentation/devicetree/bindings/pinctrl/mediatek,mt8365-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/mediatek,mt8365-pinctrl.yaml
> index 4b96884a1afc..347f533776ba 100644
> --- a/Documentation/devicetree/bindings/pinctrl/mediatek,mt8365-pinctrl.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/mediatek,mt8365-pinctrl.yaml
> @@ -91,8 +91,13 @@ patternProperties:
>   
>             input-schmitt-disable: true
>   
> +          drive-strength-microamp:
> +            enum: [125, 250, 500, 1000]
> +
>             mediatek,drive-strength-adv:
> +            deprecated: true

In the case of MT8365, since there's *no* devicetree using this property, *at all*,
I think you can even just entirely remove this block, as that should not be
considered an ABI breakage in that case.

Krzysztof, can you please confirm?

Cheers!
Angelo