diff --git a/include/dt-bindings/clock/rk3399-cru.h b/include/dt-bindings/clock/rk3399-cru.h
index 50a44cf..ce5f3e9 100644
--- a/include/dt-bindings/clock/rk3399-cru.h
+++ b/include/dt-bindings/clock/rk3399-cru.h
@@ -131,6 +131,7 @@
 #define SCLK_DPHY_RX0_CFG		165
 #define SCLK_RMII_SRC			166
 #define SCLK_PCIEPHY_REF100M		167
+#define SCLK_DDRC			168
 
 #define DCLK_VOP0			180
 #define DCLK_VOP1			181