linux-kernel - Re: [PATCH RESEND v2] dt-bindings: pwm: mediatek: Add compatible for MT7986

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Date:   Thu, 24 Nov 2022 12:30:44 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Daniel Golle <daniel@...rotopia.org>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pwm@...r.kernel.or,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Fabien Parent <fparent@...libre.com>,
        Zhi Mao <zhi.mao@...iatek.com>,
        Sam Shih <sam.shih@...iatek.com>
Subject: Re: [PATCH RESEND v2] dt-bindings: pwm: mediatek: Add compatible for
 MT7986

On 24/11/2022 12:03, Daniel Golle wrote:
> Add new compatible string for MT7986 PWM and list compatible units for
> existing entries. Also make sure the number of pwm1-X clocks is listed
> for all supported units.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
> Changes since v1: list compatibles, fix pwm1-n clocks for all SoCs
> 
> Rebased on linux-next and re-run scripts/get_maintainers.pl on patch to
> makes sure dt maintainers are included. This has been requested by
> Krzysztof Kozlowski.
> 
>  .../devicetree/bindings/pwm/pwm-mediatek.txt  | 20 +++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt b/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
> index 554c96b6d0c3..952a338e06e7 100644
> --- a/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
> +++ b/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
> @@ -2,14 +2,15 @@ MediaTek PWM controller
>  
>  Required properties:
>   - compatible: should be "mediatek,<name>-pwm":
> -   - "mediatek,mt2712-pwm": found on mt2712 SoC.
> +   - "mediatek,mt2712-pwm", "mediatek,mt6795-pwm": found on mt2712 SoC.
>     - "mediatek,mt6795-pwm": found on mt6795 SoC.
> -   - "mediatek,mt7622-pwm": found on mt7622 SoC.
> -   - "mediatek,mt7623-pwm": found on mt7623 SoC.
> +   - "mediatek,mt7622-pwm", "mediatek,mt8195-pwm", "mediatek,mt8183-pwm", "mediatek,mt7986-pwm": found on mt7622 SoC.

This does not look right. What you are saying is mt7622 is compatible
with mt8195, which is compatible with mt8183, which is compatible with
mt7986. It could be true, but I feel you wanted to say something else -
mt7622 is compatible with one SoC which is generic and common to all
other implementations.

> +   - "mediatek,mt7623-pwm", "mediatek,mt7628-pwm": found on mt7623 SoC.
>     - "mediatek,mt7628-pwm": found on mt7628 SoC.
>     - "mediatek,mt7629-pwm": found on mt7629 SoC.
> -   - "mediatek,mt8183-pwm": found on mt8183 SoC.
> -   - "mediatek,mt8195-pwm", "mediatek,mt8183-pwm": found on mt8195 SoC.
> +   - "mediatek,mt7986-pwm": found on mt7986 SoC.
> +   - "mediatek,mt8183-pwm", "mediatek,mt7986-pwm": found on mt8183 SoC.
> +   - "mediatek,mt8195-pwm", "mediatek,mt8183-pwm", "mediatek,mt7986-pwm": found on mt8195 SoC.

This as well looks excessive.

Best regards,
Krzysztof