arm64: dts: bitmain: Add clock controller support for BM1880 SoC

Add clock controller support for Bitmain BM1880 SoC.

Link: https://lore.kernel.org/r/20200114040311.6599-2-manivannan.sadhasivam@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm64/boot/dts/bitmain/bm1880.dtsi

@@ -4,6 +4,7 @@
  * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
  */
 
+#include <dt-bindings/clock/bm1880-clock.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/reset/bitmain,bm1880-reset.h>
 
@@ -66,6 +67,12 @@
 			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
 	};
 
+	osc: osc {
+		compatible = "fixed-clock";
+		clock-frequency = <25000000>;
+		#clock-cells = <0>;
+	};
+
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;
@@ -94,6 +101,15 @@
 				reg = <0x400 0x120>;
 			};
 
+			clk: clock-controller@e8 {
+				compatible = "bitmain,bm1880-clk";
+				reg = <0xe8 0x0c>, <0x800 0xb0>;
+				reg-names = "pll", "sys";
+				clocks = <&osc>;
+				clock-names = "osc";
+				#clock-cells = <1>;
+			};
+
 			rst: reset-controller@c00 {
 				compatible = "bitmain,bm1880-reset";
 				reg = <0xc00 0x8>;