ASoC: dt-bindings: stm32: document audio of graph port for i2s

When linking the STM32 I2S 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>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230606115605.1633595-2-olivier.moysan@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
index a040d4d3141205585e6971d0a7c420a8073307ed..b9111d375b93f52de81452e2a119c833ee2f9e22 100644 (file)
--- a/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
+++ b/Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml
@@ -61,6 +61,10 @@ properties:
     description: Configure the I2S device as MCLK clock provider.
     const: 0
 
+  port:
+    $ref: audio-graph-port.yaml#
+    unevaluatedProperties: false
+
 required:
   - compatible
   - "#sound-dai-cells"
@@ -89,6 +93,13 @@ examples:
         dma-names = "rx", "tx";
         pinctrl-names = "default";
         pinctrl-0 = <&i2s2_pins_a>;
+
+        /* assume audio-graph */
+        port {
+            codec_endpoint: endpoint {
+                remote-endpoint = <&codec_endpoint>;
+            };
+        };
     };
 
 ...