[PATCH] ARM: tegra: Enable CPUFreq support for Tegra124 Chromebooks

[Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

Add the device-tree DFLL clock node and CPU regulator phandle for
tegra124 chromebooks to enable CPUFreq support on these boards.

Signed-off-by: Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

---
This has been tested on a tegra124 nyan-big by using the userspace
CPUFreq governor with a simple CPU benchmark to measure the time taken
for the test to execute.

The tegra124 chromebooks use the same ams,as3722 PMIC as the Jetson TK1
board and hence, this change is based upon that for the Jetson TK1.

 arch/arm/boot/dts/tegra124-nyan.dtsi | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/tegra124-nyan.dtsi b/arch/arm/boot/dts/tegra124-nyan.dtsi
index a9aec23e06f2..40c23a0b7cfc 100644
--- a/arch/arm/boot/dts/tegra124-nyan.dtsi
+++ b/arch/arm/boot/dts/tegra124-nyan.dtsi
@@ -159,7 +159,7 @@
 				vin-ldo9-10-supply = <&vdd_5v0_sys>;
 				vin-ldo11-supply = <&vdd_3v3_run>;
 
-				sd0 {
+				vdd_cpu: sd0 {
 					regulator-name = "+VDD_CPU_AP";
 					regulator-min-microvolt = <700000>;
 					regulator-max-microvolt = <1350000>;
@@ -397,6 +397,13 @@
 		non-removable;
 	};
 
+	/* CPU DFLL clock */
+	clock@0,70110000 {
+		status = "okay";
+		vdd-cpu-supply = <&vdd_cpu>;
+		nvidia,i2c-fs-rate = <400000>;
+	};
+
 	ahub@0,70300000 {
 		i2s@0,70301100 {
 			status = "okay";
@@ -487,6 +494,12 @@
 		};
 	};
 
+	cpus {
+		cpu@0 {
+			vdd-cpu-supply = <&vdd_cpu>;
+		};
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 
-- 
2.1.4