clk: tegra124: Add support for Tegra124 clocks

NVIDIA Tegra124 Clock And Reset Controller

This binding uses the common clock binding:

Documentation/devicetree/bindings/clock/clock-bindings.txt

The CAR (Clock And Reset) Controller on Tegra is the HW module responsible

for muxing and gating Tegra's clocks, and setting their rates.

Required properties :

- compatible : Should be "nvidia,tegra124-car"

- reg : Should contain CAR registers location and length

- clocks : Should contain phandle and clock specifiers for two clocks:

  the 32 KHz "32k_in", and the board-specific oscillator "osc".

- #clock-cells : Should be 1.

  In clock consumers, this cell represents the clock ID exposed by the

  CAR. The assignments may be found in header file

  <dt-bindings/clock/tegra124-car.h>.

Example SoC include file:

/ {

	tegra_car: clock {

		compatible = "nvidia,tegra124-car";

		reg = <0x60006000 0x1000>;

		#clock-cells = <1>;

	};

	usb@c5004000 {

		clocks = <&tegra_car TEGRA124_CLK_USB2>;

	};

};

Example board file:

/ {

	clocks {

		compatible = "simple-bus";

		#address-cells = <1>;

		#size-cells = <0>;

		osc: clock@0 {

			compatible = "fixed-clock";

			reg = <0>;

			#clock-cells = <0>;

			clock-frequency = <112400000>;

		};

		clk_32k: clock@1 {

			compatible = "fixed-clock";

			reg = <1>;

			#clock-cells = <0>;

			clock-frequency = <32768>;

		};

	};

	&tegra_car {

		clocks = <&clk_32k> <&osc>;

	};

};

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += clk-tegra20.o

obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += clk-tegra30.o

obj-$(CONFIG_ARCH_TEGRA_114_SOC)	+= clk-tegra114.o

obj-$(CONFIG_ARCH_TEGRA_124_SOC)	+= clk-tegra124.o