* Renesas R-Car PWM Timer Controller

Required Properties:
- compatible: should be one of the following.
 - "renesas,pwm-rcar": for generic R-Car compatible PWM Timer
 - "renesas,pwm-r8a7778": for R-Car M1A
 - "renesas,pwm-r8a7779": for R-Car H1
 - "renesas,pwm-r8a7790": for R-Car H2
 - "renesas,pwm-r8a7791": for R-Car M2-W
 - "renesas,pwm-r8a7794": for R-Car E2
- reg: base address and length of the registers block for the PWM.
- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
  the cells format.
- clocks: clock phandle and specifier pair.
- pinctrl-0: phandle, referring to a default pin configuration node.
- pinctrl-names: Set to "default".

Example: R8A7790 (R-Car H2) PWM Timer node

	pwm0: pwm@e6e30000 {
		compatible = "renesas,pwm-r8a7790", "renesas,pwm-rcar";
		reg = <0 0xe6e30000 0 0x8>;
		#pwm-cells = <2>;
		clocks = <&mstp5_clks R8A7790_CLK_PWM>;
		pinctrl-0 = <&pwm0_pins>;
		pinctrl-names = "default";
	};

Add device tree binding document for R-Car PWM Timer
pwm: Add device tree binding document for R-Car PWM Timer

Add binding document for Renesas PWM Timer on R-Car SoCs.

Signed-off-by: Yoshihiro Shimoda <de6fb888308c49c20838826baf4e7cc406af80ff@renesas.com>
Acked-by: Geert Uytterhoeven <a1ff81395f7e6bf5b509fe9aab06bf3419493e1d@glider.be>
Reviewed-by: Simon Horman <9662bddcc379be37df16f02a449c344b4718c1a1@verge.net.au>
Signed-off-by: Thierry Reding <b75a4d02013b0e68ae2c6bb0dcfd4b7bec282dc9@gmail.com>
