ARM: tegra: add clocks property to AC'97 sound nodes

Audio-related clocks need to be represented in the device tree. Update
bindings to describe which clocks are needed, and DT files to include
those clocks.
Signed-off-by: Stephen Warren <swarren@nvidia.com>

Documentation/devicetree/bindings/sound/nvidia,tegra-audio-wm9712.txt

@@ -2,6 +2,11 @@ NVIDIA Tegra audio complex
 
 Required properties:
 - compatible : "nvidia,tegra-audio-wm9712"
+- clocks : Must contain an entry for each entry in clock-names.
+- clock-names : Must include the following entries:
+  "pll_a" (The Tegra clock of that name),
+  "pll_a_out0" (The Tegra clock of that name),
+  "mclk" (The Tegra cdev1/extern1 clock, which feeds the CODEC's mclk)
 - nvidia,model : The user-visible name of this sound complex.
 - nvidia,audio-routing : A list of the connections between audio components.
   Each entry is a pair of strings, the first being the connection's sink,
@@ -48,4 +53,7 @@ sound {
 		"Mic", "MIC1";
 
 	nvidia,ac97-controller = <&ac97>;
+
+	clocks = <&tegra_car 112>, <&tegra_car 113>, <&tegra_car 93>;
+	clock-names = "pll_a", "pll_a_out0", "mclk";
 };

arch/arm/boot/dts/tegra20-colibri-512.dtsi

@@ -473,6 +473,9 @@ sound {
 			"Mic", "MIC1";
 
 		nvidia,ac97-controller = <&ac97>;
+
+		clocks = <&tegra_car 112>, <&tegra_car 113>, <&tegra_car 93>;
+		clock-names = "pll_a", "pll_a_out0", "mclk";
 	};
 
 	regulators {