[v1] media: stm32: dcmi: stability & performance enhancements

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

Posted by Alain Volmat 1 month, 3 weeks ago

Add properties update and new sram property necessary in order
to enable the DMA-MDMA chaining.

Signed-off-by: Alain Volmat <alain.volmat@foss.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
+      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
+
   port:
     $ref: /schemas/graph.yaml#/$defs/port-base
     unevaluatedProperties: false

-- 
2.34.1

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

Posted by Rob Herring 1 month, 1 week ago

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@foss.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