linux-kernel - Re: [PATCH v5 06/13] dt-bindings: arm: stm32: add required #clock-cells property

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Message-ID: <4201bb6b-3ad8-4b35-b152-0d725310245b@foss.st.com>
Date: Thu, 28 Aug 2025 17:18:56 +0200
From: Christophe ROULLIER <christophe.roullier@...s.st.com>
To: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>,
        Yannick Fertre
	<yannick.fertre@...s.st.com>,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard
	<mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre Torgue" <alexandre.torgue@...s.st.com>,
        Catalin Marinas
	<catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
CC: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 06/13] dt-bindings: arm: stm32: add required
 #clock-cells property

On 8/22/25 16:34, Raphael Gallais-Pou wrote:
> On STM32MP25 SoC, the syscfg peripheral provides a clock to the display
> subsystem through a multiplexer.  Since it only provides a single clock,
> the cell value is 0.
>
> Doing so allows the clock consumers to reach the peripheral and gate the
> clock accordingly.
>
> Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
> Reviewed-by: Yannick Fertre <yannick.fertre@...s.st.com>
> Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
> ---
>   .../bindings/arm/stm32/st,stm32-syscon.yaml        | 31 +++++++++++++++-------
>   1 file changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
> index ed97652c84922813e94b1818c07fe8714891c089..95d2319afe235fa86974d80f89c9deeae2275232 100644
> --- a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
> +++ b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
> @@ -36,20 +36,31 @@ properties:
>     clocks:
>       maxItems: 1
>   
> +  "#clock-cells":
> +    const: 0
> +
>   required:
>     - compatible
>     - reg
>   
> -if:
> -  properties:
> -    compatible:
> -      contains:
> -        enum:
> -          - st,stm32mp157-syscfg
> -          - st,stm32f4-gcan
> -then:
> -  required:
> -    - clocks
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - st,stm32mp157-syscfg
> +              - st,stm32f4-gcan
> +    then:
> +      required:
> +        - clocks
> +  - if:
> +      properties:
> +        compatible:
> +          const: st,stm32mp25-syscfg
> +    then:
> +      required:
> +        - "#clock-cells"
>   
>   additionalProperties: false
>   
>
Acked-by: Christophe Roullier <christophe.roullier@...s.st.com>

You can merge it on DRM MISC.

Best Regards,
   Christophe