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>
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