[RFC PATCH 1/2] dt-bindings: media: snps,dw-hdmi-rx: add #sound-dai-cells

[Igor Paunovic <royalnet026@gmail.com>]

The HDMI RX controller can expose the audio embedded in the incoming
HDMI stream as an ALSA capture device. Document the #sound-dai-cells
property so that a sound card can reference the HDMI RX audio DAI.

Signed-off-by: Igor Paunovic <royalnet026@gmail.com>
---
 .../devicetree/bindings/media/snps,dw-hdmi-rx.yaml         | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
index b7f6c87..83c10d9 100644
--- a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
+++ b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
@@ -78,6 +78,13 @@ properties:
       The phandle of the syscon node for the Video Output GRF register
       to enable EDID transfer through SDAIN and SCLIN.
 
+  "#sound-dai-cells":
+    const: 1
+    description:
+      The HDMI RX controller registers a generic HDMI audio codec so the
+      audio embedded in the incoming stream can be captured. A value of 1
+      lets a sound card reference the audio DAI as <&hdmirx 0>.
+
 required:
   - compatible
   - reg
-- 
2.53.0