dt-bindings: sound: sun4i-spdif: Document that the RX channel can be missing

The H3 and compatibles controllers don't have any reception capabilities,
even though it was never documented as such in the binding before.

Therefore, on those controllers, we don't have the option to set an RX DMA
channel.

This was already done in the DTSI, but the binding itself was never
updated. Let's add a special case in the schemas.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml b/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml
index 5d72d48e923ee606deee930c3514ec074f6b5bb4..a49ef2294a741abee974aa7c319ff598afc8cdc0 100644 (file)
--- a/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml
+++ b/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml
@@ -44,19 +44,11 @@ properties:
       - const: apb
       - const: spdif
 
-  dmas:
-    items:
-      - description: RX DMA Channel
-      - description: TX DMA Channel
-
-  dma-names:
-    items:
-      - const: rx
-      - const: tx
-
   # Even though it only applies to subschemas under the conditionals,
   # not listing them here will trigger a warning because of the
   # additionalsProperties set to false.
+  dmas: true
+  dma-names: true
   resets:
     maxItems: 1
 
@@ -73,6 +65,32 @@ allOf:
       required:
         - resets
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: allwinner,sun8i-h3-spdif
+
+    then:
+      properties:
+        dmas:
+          description: TX DMA Channel
+
+        dma-names:
+          const: tx
+
+    else:
+      properties:
+        dmas:
+          items:
+            - description: RX DMA Channel
+            - description: TX DMA Channel
+
+        dma-names:
+          items:
+            - const: rx
+            - const: tx
+
 required:
   - "#sound-dai-cells"
   - compatible