[PATCH v2 2/3] ASoC: dt-bindings: document audio of graph port for cs42l51

[Olivier Moysan <olivier.moysan@foss.st.com>]

When linking the CS42L51 to another DAI component, according
to audio graph cards bindings, an OF graph port property is expected
in the node. Document the port property.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
 .../devicetree/bindings/sound/cirrus,cs42l51.yaml     | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs42l51.yaml b/Documentation/devicetree/bindings/sound/cirrus,cs42l51.yaml
index 670b67ec0b61..f7bafbd4f1c2 100644
--- a/Documentation/devicetree/bindings/sound/cirrus,cs42l51.yaml
+++ b/Documentation/devicetree/bindings/sound/cirrus,cs42l51.yaml
@@ -44,6 +44,10 @@ properties:
   VAHP-supply:
     description: phandle to voltage regulator of headphone
 
+  port:
+    $ref: audio-graph-port.yaml#
+    unevaluatedProperties: false
+
 required:
   - compatible
   - reg
@@ -69,6 +73,13 @@ examples:
         VA-supply = <&reg_audio>;
         VAHP-supply = <&reg_audio>;
         reset-gpios = <&gpiog 9 GPIO_ACTIVE_LOW>;
+
+        /* assume audio-graph */
+        port {
+          cpu_endpoint: endpoint {
+            remote-endpoint = <&cpu_endpoint>;
+          };
+        };
       };
     };
 ...
-- 
2.25.1