diff --git a/arch/arm64/boot/dts/rockchip/rk3308.dtsi b/arch/arm64/boot/dts/rockchip/rk3308.dtsi
index 97e8dc3846ae..8fea1c29e17a 100644
--- a/arch/arm64/boot/dts/rockchip/rk3308.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3308.dtsi
@@ -678,6 +678,9 @@
 		rockchip,grf = <&grf>;
 		#clock-cells = <1>;
 		#reset-cells = <1>;
+
+		assigned-clocks = <&cru SCLK_RTC32K>;
+		assigned-clock-rates = <32768>;
 	};
 
 	acodec: acodec@ff560000 {