Renesas R-Car CAN controller Device Tree Bindings
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Required properties:
- compatible: "renesas,can-r8a7778" if CAN controller is a part of R8A7778 SoC.
	      "renesas,can-r8a7779" if CAN controller is a part of R8A7779 SoC.
	      "renesas,can-r8a7790" if CAN controller is a part of R8A7790 SoC.
	      "renesas,can-r8a7791" if CAN controller is a part of R8A7791 SoC.
- reg: physical base address and size of the R-Car CAN register map.
- interrupts: interrupt specifier for the sole interrupt.
- clocks: phandles and clock specifiers for 3 CAN clock inputs.
- clock-names: 3 clock input name strings: "clkp1", "clkp2", "can_clk".
- pinctrl-0: pin control group to be used for this controller.
- pinctrl-names: must be "default".

Optional properties:
- renesas,can-clock-select: R-Car CAN Clock Source Select. Valid values are:
			    <0x0> (default) : Peripheral clock (clkp1)
			    <0x1> : Peripheral clock (clkp2)
			    <0x3> : Externally input clock

Example
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SoC common .dtsi file:

	can0: can@e6e80000 {
		compatible = "renesas,can-r8a7791";
		reg = <0 0xe6e80000 0 0x1000>;
		interrupts = <0 186 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&mstp9_clks R8A7791_CLK_RCAN0>,
			 <&cpg_clocks R8A7791_CLK_RCAN>, <&can_clk>;
		clock-names = "clkp1", "clkp2", "can_clk";
		status = "disabled";
	};

Board specific .dts file:

&can0 {
	pinctrl-0 = <&can0_pins>;
	pinctrl-names = "default";
	status = "okay";
};
