diff --git a/arch/powerpc/boot/dts/ac14xx.dts b/arch/powerpc/boot/dts/ac14xx.dts
index a543c4088cba..a1b883730b31 100644
--- a/arch/powerpc/boot/dts/ac14xx.dts
+++ b/arch/powerpc/boot/dts/ac14xx.dts
@@ -139,7 +139,14 @@
 		};
 	};
 
+	clocks {
+		osc {
+			clock-frequency = <25000000>;
+		};
+	};
+
 	soc@80000000 {
+		bus-frequency = <80000000>;	/* 80 MHz ips bus */
 
 		clock@f00 {
 			compatible = "fsl,mpc5121rev2-clock", "fsl,mpc5121-clock";
diff --git a/arch/powerpc/boot/dts/mpc5121.dtsi b/arch/powerpc/boot/dts/mpc5121.dtsi
index 2d7cb04ac962..1d533e083e3c 100644
--- a/arch/powerpc/boot/dts/mpc5121.dtsi
+++ b/arch/powerpc/boot/dts/mpc5121.dtsi
@@ -9,6 +9,8 @@
  * option) any later version.
  */
 
+#include <dt-bindings/clock/mpc512x-clock.h>
+
 /dts-v1/;
 
 / {
@@ -73,6 +75,17 @@
 		ranges = <0x0 0x0 0xfc000000 0x04000000>;
 	};
 
+	clocks {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		osc: osc {
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <33000000>;
+		};
+	};
+
 	soc@80000000 {
 		compatible = "fsl,mpc5121-immr";
 		#address-cells = <1>;
@@ -117,9 +130,12 @@
 		};
 
 		/* Clock control */
-		clock@f00 {
+		clks: clock@f00 {
 			compatible = "fsl,mpc5121-clock";
 			reg = <0xf00 0x100>;
+			#clock-cells = <1>;
+			clocks = <&osc>;
+			clock-names = "osc";
 		};
 
 		/* Power Management Controller */