diff --git a/arch/arm/dts/kirkwood-km_common.dtsi b/arch/arm/dts/kirkwood-km_common.dtsi
index 75dc839..9d0fc51 100644
--- a/arch/arm/dts/kirkwood-km_common.dtsi
+++ b/arch/arm/dts/kirkwood-km_common.dtsi
@@ -22,6 +22,7 @@
 
 		serial@12000 {
 			status = "okay";
+			clock-frequency = <200000000>;
 		};
 	};