Renesas R-Car sound

Required properties:
- compatible			: "renesas,rcar_sound-<soctype>", fallbacks
				  "renesas,rcar_sound-gen1" if generation1, and
				  "renesas,rcar_sound-gen2" if generation2
				  Examples with soctypes are:
				    - "renesas,rcar_sound-r8a7790" (R-Car H2)
				    - "renesas,rcar_sound-r8a7791" (R-Car M2-W)
- reg				: Should contain the register physical address.
				  required register is
				   SRU/ADG/SSI      if generation1
				   SRU/ADG/SSIU/SSI if generation2
- rcar_sound,ssi		: Should contain SSI feature.
				  The number of SSI subnode should be same as HW.
				  see below for detail.
- rcar_sound,src		: Should contain SRC feature.
				  The number of SRC subnode should be same as HW.
				  see below for detail.
- rcar_sound,dvc		: Should contain DVC feature.
				  The number of DVC subnode should be same as HW.
				  see below for detail.
- rcar_sound,dai		: DAI contents.
				  The number of DAI subnode should be same as HW.
				  see below for detail.

SSI subnode properties:
- interrupts			: Should contain SSI interrupt for PIO transfer
- shared-pin			: if shared clock pin
- pio-transfer			: use PIO transfer mode
- no-busif			: BUSIF is not ussed when [mem -> SSI] via DMA case

SRC subnode properties:
no properties at this point

DAI subnode properties:
- playback			: list of playback modules
- capture			: list of capture  modules

Example:

rcar_sound: rcar_sound@ec500000 {
	#sound-dai-cells = <1>;
	compatible = "renesas,rcar_sound-r8a7791", "renesas,rcar_sound-gen2";
	reg =	<0 0xec500000 0 0x1000>, /* SCU */
		<0 0xec5a0000 0 0x100>,  /* ADG */
		<0 0xec540000 0 0x1000>, /* SSIU */
		<0 0xec541000 0 0x1280>; /* SSI */

	clocks = <&mstp10_clks R8A7790_CLK_SSI_ALL>,
		<&mstp10_clks R8A7790_CLK_SSI9>, <&mstp10_clks R8A7790_CLK_SSI8>,
		<&mstp10_clks R8A7790_CLK_SSI7>, <&mstp10_clks R8A7790_CLK_SSI6>,
		<&mstp10_clks R8A7790_CLK_SSI5>, <&mstp10_clks R8A7790_CLK_SSI4>,
		<&mstp10_clks R8A7790_CLK_SSI3>, <&mstp10_clks R8A7790_CLK_SSI2>,
		<&mstp10_clks R8A7790_CLK_SSI1>, <&mstp10_clks R8A7790_CLK_SSI0>,
		<&mstp10_clks R8A7790_CLK_SCU_SRC9>, <&mstp10_clks R8A7790_CLK_SCU_SRC8>,
		<&mstp10_clks R8A7790_CLK_SCU_SRC7>, <&mstp10_clks R8A7790_CLK_SCU_SRC6>,
		<&mstp10_clks R8A7790_CLK_SCU_SRC5>, <&mstp10_clks R8A7790_CLK_SCU_SRC4>,
		<&mstp10_clks R8A7790_CLK_SCU_SRC3>, <&mstp10_clks R8A7790_CLK_SCU_SRC2>,
		<&mstp10_clks R8A7790_CLK_SCU_SRC1>, <&mstp10_clks R8A7790_CLK_SCU_SRC0>,
		<&mstp10_clks R8A7790_CLK_SCU_DVC0>, <&mstp10_clks R8A7790_CLK_SCU_DVC1>,
		<&audio_clk_a>, <&audio_clk_b>, <&audio_clk_c>, <&m2_clk>;
	clock-names = "ssi-all",
			"ssi.9", "ssi.8", "ssi.7", "ssi.6", "ssi.5",
			"ssi.4", "ssi.3", "ssi.2", "ssi.1", "ssi.0",
			"src.9", "src.8", "src.7", "src.6", "src.5",
			"src.4", "src.3", "src.2", "src.1", "src.0",
			"dvc.0", "dvc.1",
			"clk_a", "clk_b", "clk_c", "clk_i";

	rcar_sound,dvc {
		dvc0: dvc@0 { };
		dvc1: dvc@1 { };
	};

	rcar_sound,src {
		src0: src@0 {
			interrupts = <0 352 IRQ_TYPE_LEVEL_HIGH>;
		};
		src1: src@1 {
			interrupts = <0 353 IRQ_TYPE_LEVEL_HIGH>;
		};
		src2: src@2 {
			interrupts = <0 354 IRQ_TYPE_LEVEL_HIGH>;
		};
		src3: src@3 {
			interrupts = <0 355 IRQ_TYPE_LEVEL_HIGH>;
		};
		src4: src@4 {
			interrupts = <0 356 IRQ_TYPE_LEVEL_HIGH>;
		};
		src5: src@5 {
			interrupts = <0 357 IRQ_TYPE_LEVEL_HIGH>;
		};
		src6: src@6 {
			interrupts = <0 358 IRQ_TYPE_LEVEL_HIGH>;
		};
		src7: src@7 {
			interrupts = <0 359 IRQ_TYPE_LEVEL_HIGH>;
		};
		src8: src@8 {
			interrupts = <0 360 IRQ_TYPE_LEVEL_HIGH>;
		};
		src9: src@9 {
			interrupts = <0 361 IRQ_TYPE_LEVEL_HIGH>;
		};
	};

	rcar_sound,ssi {
		ssi0: ssi@0 {
			interrupts = <0 370 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi1: ssi@1 {
			interrupts = <0 371 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi2: ssi@2 {
			interrupts = <0 372 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi3: ssi@3 {
			interrupts = <0 373 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi4: ssi@4 {
			interrupts = <0 374 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi5: ssi@5 {
			interrupts = <0 375 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi6: ssi@6 {
			interrupts = <0 376 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi7: ssi@7 {
			interrupts = <0 377 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi8: ssi@8 {
			interrupts = <0 378 IRQ_TYPE_LEVEL_HIGH>;
		};
		ssi9: ssi@9 {
			interrupts = <0 379 IRQ_TYPE_LEVEL_HIGH>;
		};
	};

	rcar_sound,dai {
		dai0 {
			playback = <&ssi5 &src5>;
			capture  = <&ssi6>;
		};
		dai1 {
			playback = <&ssi3>;
		};
		dai2 {
			capture  = <&ssi4>;
		};
		dai3 {
			playback = <&ssi7>;
		};
		dai4 {
			capture  = <&ssi8>;
		};
	};
};