diff --git a/arch/arm64/boot/dts/rockchip/rk3566-radxa-cm3-rpi-cm4-io.dts b/arch/arm64/boot/dts/rockchip/rk3566-radxa-cm3-rpi-cm4-io.dts
index a7fd339b610a41..b0b89c544b57ea 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-radxa-cm3-rpi-cm4-io.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-radxa-cm3-rpi-cm4-io.dts
@@ -25,7 +25,7 @@
 
 	hdmi_sound: hdmi-sound {
 		compatible = "simple-audio-card";
-		simple-audio-card,format = "is";
+		simple-audio-card,format = "i2s";
 		simple-audio-card,mclk-fs = <128>;
 		simple-audio-card,name = "rockchip-hdmi0";