linux-kernel - Re: [PATCH 09/12] dt-bindings: media: st: dcmi: add DMA-MDMA chaining properties

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Message-ID: <20251229233925.GA2796847-robh@kernel.org>
Date: Mon, 29 Dec 2025 17:39:25 -0600
From: Rob Herring <robh@...nel.org>
To: Alain Volmat <alain.volmat@...s.st.com>
Cc: Hugues Fruchet <hugues.fruchet@...s.st.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	linux-media@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH 09/12] dt-bindings: media: st: dcmi: add DMA-MDMA
 chaining properties

On Thu, Dec 18, 2025 at 07:44:49PM +0100, Alain Volmat wrote:
> Add properties update and new sram property necessary in order
> to enable the DMA-MDMA chaining.
> 
> Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
> ---
>  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
> index 34147127192f..ccaa2d0a2669 100644
> --- a/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
> +++ b/Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml
> @@ -27,11 +27,14 @@ properties:
>        - const: mclk
>  
>    dmas:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
>  
>    dma-names:
>      items:
>        - const: tx
> +      - const: mdma_tx
> +    minItems: 1
>  
>    resets:
>      maxItems: 1
> @@ -40,6 +43,14 @@ properties:
>      minItems: 1
>      maxItems: 2
>  
> +  sram:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      phandles to a reserved SRAM region which is used as temporary

phandle to...

> +      storage memory between DMA and MDMA engines.

> +      The region should be defined as child nodes of the AHB SRAM node
> +      as per the generic bindings in Documentation/devicetree/bindings/sram/sram.yaml

Drop this sentence.

Rob