[PATCH] dt-bindings: sound: st,stm32-sai: Document audio OF graph port

[Marek Vasut <marex@denx.de>]

It is expected that the SAI subnodes would contain audio OF graph port
with endpoint to link it with the other side of audio link. Document
the port: property.

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Olivier Moysan <olivier.moysan@foss.st.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: alsa-devel@alsa-project.org
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
---
 Documentation/devicetree/bindings/sound/st,stm32-sai.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
index 1a3abc9495055..56d206f97a96c 100644
--- a/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
+++ b/Documentation/devicetree/bindings/sound/st,stm32-sai.yaml
@@ -122,6 +122,10 @@ patternProperties:
         description: Configure the SAI device as master clock provider.
         const: 0
 
+      port:
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+
     required:
       - compatible
       - "#sound-dai-cells"
-- 
2.35.1