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

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Message-ID: <20251218-stm32-dcmi-dma-chaining-v1-9-39948ca6cbf6@foss.st.com>
Date: Thu, 18 Dec 2025 19:44:49 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: 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>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König
	<christian.koenig@....com>
CC: <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>,
        Alain Volmat <alain.volmat@...s.st.com>
Subject: [PATCH 09/12] dt-bindings: media: st: dcmi: add DMA-MDMA chaining
 properties

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
+      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