diff --git a/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi b/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi
index a5511b1f0ce3..c74e36676d1b 100644
--- a/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi
@@ -515,6 +515,7 @@ sai2a_endpoint: endpoint {
 				remote-endpoint = <&cs42l51_tx_endpoint>;
 				dai-format = "i2s";
 				mclk-fs = <256>;
+				system-clock-direction-out;
 				dai-tdm-slot-num = <2>;
 				dai-tdm-slot-width = <32>;
 			};