* Renesas RZ/A1 Clock Pulse Generator (CPG)

The CPG generates core clocks for the RZ/A1 SoCs. It includes the PLL, variable
CPU and GPU clocks, and several fixed ratio dividers.
The CPG also provides a Clock Domain for SoC devices, in combination with the
CPG Module Stop (MSTP) Clocks.

Required Properties:

  - compatible: Must be one of
    - "renesas,r7s72100-cpg-clocks" for the r7s72100 CPG
    and "renesas,rz-cpg-clocks" as a fallback.
  - reg: Base address and length of the memory resource used by the CPG
  - clocks: References to possible parent clocks. Order must match clock modes
    in the datasheet. For the r7s72100, this is extal, usb_x1.
  - #clock-cells: Must be 1
  - clock-output-names: The names of the clocks. Supported clocks are "pll",
    "i", and "g"
  - #power-domain-cells: Must be 0

SoC devices that are part of the CPG/MSTP Clock Domain and can be power-managed
through an MSTP clock should refer to the CPG device node in their
"power-domains" property, as documented by the generic PM domain bindings in
Documentation/devicetree/bindings/power/power_domain.txt.


Examples
--------

  - CPG device node:

	cpg_clocks: cpg_clocks@fcfe0000 {
		#clock-cells = <1>;
		compatible = "renesas,r7s72100-cpg-clocks",
			     "renesas,rz-cpg-clocks";
		reg = <0xfcfe0000 0x18>;
		clocks = <&extal_clk>, <&usb_x1_clk>;
		clock-output-names = "pll", "i", "g";
		#power-domain-cells = <0>;
	};


  - CPG/MSTP Clock Domain member device node:

	mtu2: timer@fcff0000 {
		compatible = "renesas,mtu2-r7s72100", "renesas,mtu2";
		reg = <0xfcff0000 0x400>;
		interrupts = <0 107 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-names = "tgi0a";
		clocks = <&mstp3_clks R7S72100_CLK_MTU2>;
		clock-names = "fck";
		power-domains = <&cpg_clocks>;
	};