diff --git a/arch/arm/boot/dts/r7s72100.dtsi b/arch/arm/boot/dts/r7s72100.dtsi
index f50fbc8f3bd9584a5d8a74fb9fb55c4bfe01225b..bdee225411895f75b7e8477527496ff696074cf3 100644
--- a/arch/arm/boot/dts/r7s72100.dtsi
+++ b/arch/arm/boot/dts/r7s72100.dtsi
@@ -144,6 +144,7 @@
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			reg = <0>;
+			clock-frequency = <400000000>;
 		};
 	};