[PATCH v4 1/3] dt-bindings: dma: arm-dma350: document generic and combined IRQ topologies

[Jun Guo <jun.guo@cixtech.com>]

Update the DMA-350 DT binding to match the current driver behavior.

Allow both:
- "arm,dma-350" as the generic compatible, and
- "cix,sky1-dma-350", "arm,dma-350" for SoC-specific fallback usage.

Also document interrupt topology variants supported by hardware
integration:
- one combined interrupt for all channels, or
- one interrupt per channel (up to 8 channels).

Assisted-by: Cursor: GPT-5.3-Codex
Signed-off-by: Jun Guo <jun.guo@cixtech.com>
---
 .../devicetree/bindings/dma/arm,dma-350.yaml  | 34 +++++++++++++------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/arm,dma-350.yaml b/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
index 429f682f15d8..47091614d1b4 100644
--- a/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
+++ b/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
@@ -14,7 +14,14 @@ allOf:
 
 properties:
   compatible:
-    const: arm,dma-350
+    description:
+      Use "arm,dma-350" for generic integration. A SoC-specific
+      compatible may be listed first, followed by "arm,dma-350".
+    oneOf:
+      - const: arm,dma-350
+      - items:
+          - const: cix,sky1-dma-350
+          - const: arm,dma-350
 
   reg:
     items:
@@ -22,15 +29,22 @@ properties:
 
   interrupts:
     minItems: 1
-    items:
-      - description: Channel 0 interrupt
-      - description: Channel 1 interrupt
-      - description: Channel 2 interrupt
-      - description: Channel 3 interrupt
-      - description: Channel 4 interrupt
-      - description: Channel 5 interrupt
-      - description: Channel 6 interrupt
-      - description: Channel 7 interrupt
+    maxItems: 8
+    description:
+      Either one interrupt per channel (8 interrupts), or one
+      combined interrupt for all channels.
+    oneOf:
+      - items:
+          - description: Channel 0 interrupt
+          - description: Channel 1 interrupt
+          - description: Channel 2 interrupt
+          - description: Channel 3 interrupt
+          - description: Channel 4 interrupt
+          - description: Channel 5 interrupt
+          - description: Channel 6 interrupt
+          - description: Channel 7 interrupt
+      - items:
+          - description: Combined interrupt shared by all channels
 
   "#dma-cells":
     const: 1
-- 
2.34.1