[PATCH v6 3/5] dt-bindings: dma: arm,dma-350: Describe the CIX Sky1 integration

[Jelly Jia <Jelly.Jia@cixtech.com>]

DMA-350 integrations may gate the controller with a bus clock or hold it
in reset. Describe these standard resources on the DMA controller node.

Add the CIX Sky1 compatible with an arm,dma-350 fallback. Sky1 requires
a bus clock for both its FCH and AUDSS instances, while only the AUDSS
instance provides a reset. Require clocks for the Sky1 compatible and
keep resets optional.

Both resources remain optional for the generic compatible alone, so
existing device trees remain valid.

Signed-off-by: Jelly Jia <Jelly.Jia@cixtech.com>
---
 .../devicetree/bindings/dma/arm,dma-350.yaml  | 30 ++++++++++++++++---
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/arm,dma-350.yaml b/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
index 429f682f15d8..eab3b31aeba7 100644
--- a/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
+++ b/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
@@ -9,12 +9,13 @@ title: Arm CoreLink DMA-350 Controller
 maintainers:
   - Robin Murphy <robin.murphy@arm.com>
 
-allOf:
-  - $ref: dma-controller.yaml#
-
 properties:
   compatible:
-    const: arm,dma-350
+    oneOf:
+      - const: arm,dma-350
+      - items:
+          - const: cix,sky1-dma350
+          - const: arm,dma-350
 
   reg:
     items:
@@ -36,9 +37,30 @@ properties:
     const: 1
     description: The cell is the trigger input number
 
+  clocks:
+    maxItems: 1
+    description:
+      Bus clock, where the integration gates the controller clock.
+
+  resets:
+    maxItems: 1
+    description:
+      Optional reset line, where the integration exposes one.
+
 required:
   - compatible
   - reg
   - interrupts
 
+allOf:
+  - $ref: dma-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: cix,sky1-dma350
+    then:
+      required:
+        - clocks
+
 unevaluatedProperties: false
-- 
2.54.0