ARM: dts: add audio clock controller for exynos5420

This adds device-tree bindings for the audio subsystem clock controller
on Exynos 5420.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/57712
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5420.dtsi

@@ -15,6 +15,9 @@
 
 #include "exynos5.dtsi"
 #include "exynos5420-pinctrl.dtsi"
+
+#include <dt-bindings/clk/exynos-audss-clk.h>
+
 / {
 	compatible = "samsung,exynos5420";
 
@@ -65,6 +68,14 @@
 		#clock-cells = <1>;
 	};
 
+	clock_audss: audss-clock-controller@3810000 {
+		compatible = "samsung,exynos5420-audss-clock";
+		reg = <0x03810000 0x0C>;
+		#clock-cells = <1>;
+		clocks = <&clock 148>;
+		clock-names = "sclk_audio";
+	};
+
 	codec@11000000 {
 		compatible = "samsung,mfc-v7";
 		reg = <0x11000000 0x10000>;