diff --git a/include/dt-bindings/clock/rk3228-cru.h b/include/dt-bindings/clock/rk3228-cru.h
index 56f841c22801a7b5c349cb99f5732b3274986ce3..55655ab0a4c47a2c538f7e866409a5361be285f8 100644
--- a/include/dt-bindings/clock/rk3228-cru.h
+++ b/include/dt-bindings/clock/rk3228-cru.h
@@ -49,6 +49,7 @@
 #define SCLK_EMMC_DRV		117
 #define SCLK_SDMMC_SAMPLE	118
 #define SCLK_SDIO_SAMPLE	119
+#define SCLK_SDIO_SRC		120
 #define SCLK_EMMC_SAMPLE	121
 #define SCLK_VOP		122
 #define SCLK_HDMI_HDCP		123