[v2] media: stm32: dcmi: stability & performance enhancements

[PATCH v2 09/12] dt-bindings: media: st: dcmi: add DMA-MDMA chaining properties

Posted by Alain Volmat 1 month 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>

---
Change in v2:
  - correct typo (phandles -> phandle)
  - remove explanation about generic binding sram.yaml
---
 Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml | 11 ++++++++++-
 1 file changed, 10 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..979360e9099e 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 +43,12 @@ properties:
     minItems: 1
     maxItems: 2
 
+  sram:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      phandle to a reserved SRAM region which is used as temporary
+      storage memory between DMA and MDMA engines.
+
   port:
     $ref: /schemas/graph.yaml#/$defs/port-base
     unevaluatedProperties: false

-- 
2.34.1

Re: [PATCH v2 09/12] dt-bindings: media: st: dcmi: add DMA-MDMA chaining properties

Posted by Rob Herring (Arm) 3 weeks, 4 days ago

On Tue, 06 Jan 2026 12:34:37 +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>
> 
> ---
> Change in v2:
>   - correct typo (phandles -> phandle)
>   - remove explanation about generic binding sram.yaml
> ---
>  Documentation/devicetree/bindings/media/st,stm32-dcmi.yaml | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>