[alsa-devel] [PATCH v2 2/2] dt-bindings: sound: sun4i-spdif: Document that the RX channel can be missing

[Maxime Ripard]

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 at bootlin.com>

---

Changes from v1:
  - switch to a draft7 conditional
---
 Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml | 45 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 36 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml b/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml
index 5698e5de5e31..8f1bc1a1af96 100644
--- a/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml
+++ b/Documentation/devicetree/bindings/sound/allwinner,sun4i-a10-spdif.yaml
@@ -44,15 +44,8 @@ properties:
       - const: apb
       - const: spdif
 
-  dmas:
-    items:
-      - description: RX DMA Channel
-      - description: TX DMA Channel
-
-  dma-names:
-    items:
-      - const: rx
-      - const: tx
+  dmas: true
+  dma-names: true
 
   resets:
     maxItems: 1
@@ -70,6 +63,40 @@ allOf:
       required:
         - resets
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: allwinner,sun8i-h3-spdif
+
+    then:
+      properties:
+        dmas:
+          maxItems: 1
+          items:
+            - description: RX DMA Channel
+
+        dma-names:
+          maxItems: 1
+          items:
+            - const: tx
+
+    else:
+      properties:
+        dmas:
+          minItems: 2
+          maxItems: 2
+          items:
+            - description: RX DMA Channel
+            - description: TX DMA Channel
+
+        dma-names:
+          minItems: 2
+          maxItems: 2
+          items:
+            - const: rx
+            - const: tx
+
 required:
   - "#sound-dai-cells"
   - compatible
-- 
git-series 0.9.1