[deliverable/linux.git] / Documentation / devicetree / bindings / sound / renesas,rsnd.txt

Renesas R-Car sound

=============================================
* Modules
=============================================

Renesas R-Car sound is constructed from below modules
(for Gen2 or later)

 SCU		: Sampling Rate Converter Unit
  - SRC		: Sampling Rate Converter
  - CMD
   - CTU	: Channel Transfer Unit
   - MIX	: Mixer
   - DVC	: Digital Volume and Mute Function
 SSIU		: Serial Sound Interface Unit
 SSI		: Serial Sound Interface

See detail of each module's channels, connection, limitation on datasheet

=============================================
* Multi channel
=============================================

Multi channel is supported by Multi-SSI, or TDM-SSI.

 Multi-SSI	: 6ch case, you can use stereo x 3 SSI
 TDM-SSI	: 6ch case, you can use TDM

=============================================
* Enable/Disable each modules
=============================================

See datasheet to check SRC/CTU/MIX/DVC connect-limitation.
DT controls enabling/disabling module.
${LINUX}/arch/arm/boot/dts/r8a7790-lager.dts can be good example.
This is example of

Playback: [MEM] -> [SRC2] -> [DVC0] -> [SSIU0/SSI0] -> [codec]
Capture:  [MEM] <- [DVC1] <- [SRC3] <- [SSIU1/SSI1] <- [codec]

	&rcar_sound {
		...
		rcar_sound,dai {
			dai0 {
				playback = <&ssi0 &src2 &dvc0>;
				capture  = <&ssi1 &src3 &dvc1>;
			};
		};
	};

You can use below.
${LINUX}/arch/arm/boot/dts/r8a7790.dts can be good example.

	&src0	&ctu00	&mix0	&dvc0	&ssi0
	&src1	&ctu01	&mix1	&dvc1	&ssi1
	&src2	&ctu02			&ssi2
	&src3	&ctu03			&ssi3
	&src4				&ssi4
	&src5	&ctu10			&ssi5
	&src6	&ctu11			&ssi6
	&src7	&ctu12			&ssi7
	&src8	&ctu13			&ssi8
	&src9				&ssi9

=============================================
* SRC (Sampling Rate Converter)
=============================================

 [xx]Hz        [yy]Hz
 ------> [SRC] ------>

SRC can convert [xx]Hz to [yy]Hz. Then, it has below 2 modes

 Asynchronous mode:	input data / output data are based on different clocks.
			you can use this mode on Playback / Capture
 Synchronous mode:	input data / output data are based on same clocks.
			This mode will be used if system doesn't have its input clock,
			for example digital TV case.
			you can use this mode on Playback

------------------
**     Asynchronous mode
------------------

You need to use "renesas,rsrc-card" sound card for it.
example)

	sound {
		compatible = "renesas,rsrc-card";
		...
		/*
		 * SRC Asynchronous mode setting
		 * Playback:
		 * All input data will be converted to 48kHz
		 * Capture:
		 * Inputed 48kHz data will be converted to
		 * system specified Hz
		 */
		convert-rate = <48000>;
		...
		cpu {
			sound-dai = <&rcar_sound>;
		};
		codec {
			...
		};
	};

------------------
**     Synchronous mode
------------------

	> amixer set "SRC Out Rate" on
	> aplay xxxx.wav
	> amixer set "SRC Out Rate" 48000
	> amixer set "SRC Out Rate" 44100

=============================================
* CTU (Channel Transfer Unit)
=============================================

 [xx]ch        [yy]ch
 ------> [CTU] -------->

CTU can convert [xx]ch to [yy]ch, or exchange outputed channel.
CTU conversion needs matrix settings.
For more detail information, see below

	Renesas R-Car datasheet
	 - Sampling Rate Converter Unit (SCU)
	  - SCU Operation
	   - CMD Block
	    - Functional Blocks in CMD

	Renesas R-Car datasheet
	 - Sampling Rate Converter Unit (SCU)
	  - Register Description
	   - CTUn Scale Value exx Register (CTUn_SVxxR)

	${LINUX}/sound/soc/sh/rcar/ctu.c
	 - comment of header

You need to use "renesas,rsrc-card" sound card for it.
example)

	sound {
		compatible = "renesas,rsrc-card";
		...
		/*
		 * CTU setting
		 * All input data will be converted to 2ch
		 * as output data
		 */
		convert-channels = <2>;
		...
		cpu {
			sound-dai = <&rcar_sound>;
		};
		codec {
			...
		};
	};

Ex) Exchange output channel
 Input -> Output
  1ch  ->  0ch
  0ch  ->  1ch

  example of using matrix
	output 0ch = (input 0ch x 0) + (input 1ch x 1)
	output 1ch = (input 0ch x 1) + (input 1ch x 0)

	amixer set "CTU Reset" on
	amixer set "CTU Pass" 9,10
	amixer set "CTU SV0" 0,4194304
	amixer set "CTU SV1" 4194304,0

 example of changing connection
	amixer set "CTU Reset" on
	amixer set "CTU Pass" 2,1

=============================================
* MIX (Mixer)
=============================================

MIX merges 2 sounds path. You can see 2 sound interface on system,
and these sounds will be merged by MIX.

	aplay -D plughw:0,0 xxxx.wav &
	aplay -D plughw:0,1 yyyy.wav

You need to use "renesas,rsrc-card" sound card for it.
Ex)
	[MEM] -> [SRC1] -> [CTU02] -+-> [MIX0] -> [DVC0] -> [SSI0]
	                            |
	[MEM] -> [SRC2] -> [CTU03] -+

	sound {
		compatible = "renesas,rsrc-card";
		...
		cpu@0 {
			sound-dai = <&rcar_sound 0>;
		};
		cpu@1 {
			sound-dai = <&rcar_sound 1>;
		};
		codec {
			...
		};
	};

	&rcar_sound {
		...
		rcar_sound,dai {
			dai0 {
				playback = <&src1 &ctu02 &mix0 &dvc0 &ssi0>;
			};
			dai1 {
				playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;
			};
		};
	};

=============================================
* DVC (Digital Volume and Mute Function)
=============================================

DVC controls Playback/Capture volume.

Playback Volume
	amixer set "DVC Out" 100%

Capture Volume
	amixer set "DVC In" 100%

Playback Mute
	amixer set "DVC Out Mute" on

Capture Mute
	amixer set "DVC In Mute" on

Volume Ramp
	amixer set "DVC Out Ramp Up Rate"   "0.125 dB/64 steps"
	amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
	amixer set "DVC Out Ramp" on
	aplay xxx.wav &
	amixer set "DVC Out"  80%  // Volume Down
	amixer set "DVC Out" 100%  // Volume Up

=============================================
* SSIU (Serial Sound Interface Unit)
=============================================

There is no DT settings for SSIU, because SSIU will be automatically
selected via SSI.
SSIU can avoid some under/over run error, because it has some buffer.
But you can't use it if SSI was PIO mode.
In DMA mode, you can select not to use SSIU by using "no-busif" on DT.

	&ssi0 {
		no-busif;
	};

=============================================
* SSI (Serial Sound Interface)
=============================================

**  PIO mode

You can use PIO mode which is for connection check by using.
Note: The system will drop non-SSI modules in PIO mode
even though if DT is selecting other modules.

	&ssi0 {
		pio-transfer
	};

** DMA mode without SSIU

You can use DMA without SSIU.
Note: under/over run, or noise are likely to occur

	&ssi0 {
		no-busif;
	};

** PIN sharing

Each SSI can share WS pin. It is based on platform.
This is example if SSI1 want to share WS pin with SSI0

	&ssi1 {
		shared-pin;
	};

** Multi-SSI

You can use Multi-SSI.
This is example of SSI0/SSI1/SSI2 (= for 6ch)

	&rcar_sound {
		...
		rcar_sound,dai {
			dai0 {
				playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>;
			};
		};
	};

** TDM-SSI

You can use TDM with SSI.
This is example of TDM 6ch.
Driver can automatically switches TDM <-> stereo mode in this case.

	rsnd_tdm: sound {
		compatible = "simple-audio-card";
		...
		simple-audio-card,cpu {
			/* system can use TDM 6ch */
			dai-tdm-slot-num = <6>;
			sound-dai = <&rcar_sound>;
		};
		simple-audio-card,codec {
			...
		};
	};


=============================================
Required properties:
=============================================

- compatible			: "renesas,rcar_sound-<soctype>", fallbacks
				  "renesas,rcar_sound-gen1" if generation1, and
				  "renesas,rcar_sound-gen2" if generation2
				  "renesas,rcar_sound-gen3" if generation3
				  Examples with soctypes are:
				    - "renesas,rcar_sound-r8a7778" (R-Car M1A)
				    - "renesas,rcar_sound-r8a7779" (R-Car H1)
				    - "renesas,rcar_sound-r8a7790" (R-Car H2)
				    - "renesas,rcar_sound-r8a7791" (R-Car M2-W)
				    - "renesas,rcar_sound-r8a7793" (R-Car M2-N)
				    - "renesas,rcar_sound-r8a7794" (R-Car E2)
				    - "renesas,rcar_sound-r8a7795" (R-Car H3)
- 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,ctu		: Should contain CTU feature.
				  The number of CTU subnode should be same as HW.
				  see below for detail.
- rcar_sound,mix		: Should contain MIX feature.
				  The number of MIX 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.
- #sound-dai-cells		: it must be 0 if your system is using single DAI
				  it must be 1 if your system is using multi  DAI

Optional properties:
- #clock-cells			: it must be 0 if your system has audio_clkout
				  it must be 1 if your system has audio_clkout0/1/2/3
- clock-frequency		: for all audio_clkout0/1/2/3
- clkout-lr-asynchronous	: boolean property. it indicates that audio_clkoutn
				  is asynchronizes with lr-clock.

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
- dma				: Should contain Audio DMAC entry
- dma-names			: SSI  case "rx"  (=playback), "tx"  (=capture)
				  SSIU case "rxu" (=playback), "txu" (=capture)

SRC subnode properties:
- dma				: Should contain Audio DMAC entry
- dma-names			: "rx" (=playback), "tx" (=capture)

DVC subnode properties:
- dma				: Should contain Audio DMAC entry
- dma-names			: "tx" (=playback/capture)

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


=============================================
Example:
=============================================

rcar_sound: 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 */
		<0 0xec740000 0 0x200>;  /* Audio DMAC peri peri*/
	reg-names = "scu", "adg", "ssiu", "ssi", "audmapp";

	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 {
			dmas = <&audma0 0xbc>;
			dma-names = "tx";
		};
		dvc1: dvc@1 {
			dmas = <&audma0 0xbe>;
			dma-names = "tx";
		};
	};

	rcar_sound,mix {
		mix0: mix@0 { };
		mix1: mix@1 { };
	};

	rcar_sound,ctu {
		ctu00: ctu@0 { };
		ctu01: ctu@1 { };
		ctu02: ctu@2 { };
		ctu03: ctu@3 { };
		ctu10: ctu@4 { };
		ctu11: ctu@5 { };
		ctu12: ctu@6 { };
		ctu13: ctu@7 { };
	};

	rcar_sound,src {
		src0: src@0 {
			interrupts = <0 352 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x85>, <&audma1 0x9a>;
			dma-names = "rx", "tx";
		};
		src1: src@1 {
			interrupts = <0 353 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x87>, <&audma1 0x9c>;
			dma-names = "rx", "tx";
		};
		src2: src@2 {
			interrupts = <0 354 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x89>, <&audma1 0x9e>;
			dma-names = "rx", "tx";
		};
		src3: src@3 {
			interrupts = <0 355 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x8b>, <&audma1 0xa0>;
			dma-names = "rx", "tx";
		};
		src4: src@4 {
			interrupts = <0 356 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x8d>, <&audma1 0xb0>;
			dma-names = "rx", "tx";
		};
		src5: src@5 {
			interrupts = <0 357 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x8f>, <&audma1 0xb2>;
			dma-names = "rx", "tx";
		};
		src6: src@6 {
			interrupts = <0 358 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x91>, <&audma1 0xb4>;
			dma-names = "rx", "tx";
		};
		src7: src@7 {
			interrupts = <0 359 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x93>, <&audma1 0xb6>;
			dma-names = "rx", "tx";
		};
		src8: src@8 {
			interrupts = <0 360 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x95>, <&audma1 0xb8>;
			dma-names = "rx", "tx";
		};
		src9: src@9 {
			interrupts = <0 361 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x97>, <&audma1 0xba>;
			dma-names = "rx", "tx";
		};
	};

	rcar_sound,ssi {
		ssi0: ssi@0 {
			interrupts = <0 370 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x01>, <&audma1 0x02>, <&audma0 0x15>, <&audma1 0x16>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi1: ssi@1 {
			interrupts = <0 371 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x03>, <&audma1 0x04>, <&audma0 0x49>, <&audma1 0x4a>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi2: ssi@2 {
			interrupts = <0 372 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x05>, <&audma1 0x06>, <&audma0 0x63>, <&audma1 0x64>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi3: ssi@3 {
			interrupts = <0 373 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x07>, <&audma1 0x08>, <&audma0 0x6f>, <&audma1 0x70>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi4: ssi@4 {
			interrupts = <0 374 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x09>, <&audma1 0x0a>, <&audma0 0x71>, <&audma1 0x72>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi5: ssi@5 {
			interrupts = <0 375 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x0b>, <&audma1 0x0c>, <&audma0 0x73>, <&audma1 0x74>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi6: ssi@6 {
			interrupts = <0 376 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x0d>, <&audma1 0x0e>, <&audma0 0x75>, <&audma1 0x76>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi7: ssi@7 {
			interrupts = <0 377 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x0f>, <&audma1 0x10>, <&audma0 0x79>, <&audma1 0x7a>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi8: ssi@8 {
			interrupts = <0 378 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x11>, <&audma1 0x12>, <&audma0 0x7b>, <&audma1 0x7c>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
		ssi9: ssi@9 {
			interrupts = <0 379 IRQ_TYPE_LEVEL_HIGH>;
			dmas = <&audma0 0x13>, <&audma1 0x14>, <&audma0 0x7d>, <&audma1 0x7e>;
			dma-names = "rx", "tx", "rxu", "txu";
		};
	};

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

=============================================
Example: simple sound card
=============================================

	rsnd_ak4643: sound {
		compatible = "simple-audio-card";

		simple-audio-card,format = "left_j";
		simple-audio-card,bitclock-master = <&sndcodec>;
		simple-audio-card,frame-master = <&sndcodec>;

		sndcpu: simple-audio-card,cpu {
			sound-dai = <&rcar_sound>;
		};

		sndcodec: simple-audio-card,codec {
			sound-dai = <&ak4643>;
			clocks = <&audio_clock>;
		};
	};

&rcar_sound {
	pinctrl-0 = <&sound_pins &sound_clk_pins>;
	pinctrl-names = "default";

	/* Single DAI */
	#sound-dai-cells = <0>;

	status = "okay";

	rcar_sound,dai {
		dai0 {
			playback = <&ssi0 &src2 &dvc0>;
			capture  = <&ssi1 &src3 &dvc1>;
		};
	};
};

&ssi1 {
	shared-pin;
};

=============================================
Example: simple sound card for TDM
=============================================

	rsnd_tdm: sound {
		compatible = "simple-audio-card";

		simple-audio-card,format = "left_j";
		simple-audio-card,bitclock-master = <&sndcodec>;
		simple-audio-card,frame-master = <&sndcodec>;

		sndcpu: simple-audio-card,cpu {
			sound-dai = <&rcar_sound>;
			dai-tdm-slot-num = <6>;
		};

		sndcodec: simple-audio-card,codec {
			sound-dai = <&xxx>;
		};
	};

=============================================
Example: simple sound card for Multi channel
=============================================

&rcar_sound {
	pinctrl-0 = <&sound_pins &sound_clk_pins>;
	pinctrl-names = "default";

	/* Single DAI */
	#sound-dai-cells = <0>;

	status = "okay";

	rcar_sound,dai {
		dai0 {
			playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>;
		};
	};
};
Commit	Line	Data
90e8e50f KM	1	Renesas R-Car sound
90e8e50f KM	2
f1511a14 KM	3	=============================================
	4	* Modules
	5	=============================================
	6
	7	Renesas R-Car sound is constructed from below modules
	8	(for Gen2 or later)
	9
	10	SCU : Sampling Rate Converter Unit
	11	- SRC : Sampling Rate Converter
	12	- CMD
	13	- CTU : Channel Transfer Unit
	14	- MIX : Mixer
	15	- DVC : Digital Volume and Mute Function
	16	SSIU : Serial Sound Interface Unit
	17	SSI : Serial Sound Interface
	18
	19	See detail of each module's channels, connection, limitation on datasheet
	20
	21	=============================================
	22	* Multi channel
	23	=============================================
	24
	25	Multi channel is supported by Multi-SSI, or TDM-SSI.
	26
	27	Multi-SSI : 6ch case, you can use stereo x 3 SSI
	28	TDM-SSI : 6ch case, you can use TDM
	29
	30	=============================================
	31	* Enable/Disable each modules
	32	=============================================
	33
	34	See datasheet to check SRC/CTU/MIX/DVC connect-limitation.
	35	DT controls enabling/disabling module.
	36	${LINUX}/arch/arm/boot/dts/r8a7790-lager.dts can be good example.
	37	This is example of
	38
	39	Playback: [MEM] -> [SRC2] -> [DVC0] -> [SSIU0/SSI0] -> [codec]
	40	Capture: [MEM] <- [DVC1] <- [SRC3] <- [SSIU1/SSI1] <- [codec]
	41
	42	&rcar_sound {
	43	...
	44	rcar_sound,dai {
	45	dai0 {
	46	playback = <&ssi0 &src2 &dvc0>;
	47	capture = <&ssi1 &src3 &dvc1>;
	48	};
	49	};
	50	};
	51
	52	You can use below.
	53	${LINUX}/arch/arm/boot/dts/r8a7790.dts can be good example.
	54
	55	&src0 &ctu00 &mix0 &dvc0 &ssi0
	56	&src1 &ctu01 &mix1 &dvc1 &ssi1
	57	&src2 &ctu02 &ssi2
	58	&src3 &ctu03 &ssi3
	59	&src4 &ssi4
	60	&src5 &ctu10 &ssi5
	61	&src6 &ctu11 &ssi6
	62	&src7 &ctu12 &ssi7
	63	&src8 &ctu13 &ssi8
	64	&src9 &ssi9
	65
	66	=============================================
67	* SRC (Sampling Rate Converter)
68	=============================================
69
70	[xx]Hz [yy]Hz
71	------> [SRC] ------>
72
73	SRC can convert [xx]Hz to [yy]Hz. Then, it has below 2 modes
74
75	Asynchronous mode: input data / output data are based on different clocks.
76	you can use this mode on Playback / Capture
77	Synchronous mode: input data / output data are based on same clocks.
78	This mode will be used if system doesn't have its input clock,
79	for example digital TV case.
80	you can use this mode on Playback
81
82	------------------
83	** Asynchronous mode
84	------------------
85
86	You need to use "renesas,rsrc-card" sound card for it.
87	example)
88
89	sound {
90	compatible = "renesas,rsrc-card";
91	...
92	/*
93	* SRC Asynchronous mode setting
94	* Playback:
95	* All input data will be converted to 48kHz
96	* Capture:
97	* Inputed 48kHz data will be converted to
98	* system specified Hz
99	*/
100	convert-rate = <48000>;
101	...
102	cpu {
103	sound-dai = <&rcar_sound>;
104	};
105	codec {
106	...
107	};
108	};
109
110	------------------
111	** Synchronous mode
112	------------------
113
114	> amixer set "SRC Out Rate" on
115	> aplay xxxx.wav
116	> amixer set "SRC Out Rate" 48000
117	> amixer set "SRC Out Rate" 44100
118
119	=============================================
120	* CTU (Channel Transfer Unit)
121	=============================================
122
123	[xx]ch [yy]ch
124	------> [CTU] -------->
125
126	CTU can convert [xx]ch to [yy]ch, or exchange outputed channel.
127	CTU conversion needs matrix settings.
128	For more detail information, see below
129
130	Renesas R-Car datasheet
131	- Sampling Rate Converter Unit (SCU)
132	- SCU Operation
133	- CMD Block
134	- Functional Blocks in CMD
135
136	Renesas R-Car datasheet
137	- Sampling Rate Converter Unit (SCU)
138	- Register Description
139	- CTUn Scale Value exx Register (CTUn_SVxxR)
140
141	${LINUX}/sound/soc/sh/rcar/ctu.c
142	- comment of header
143
144	You need to use "renesas,rsrc-card" sound card for it.
145	example)
146
147	sound {
148	compatible = "renesas,rsrc-card";
149	...
150	/*
151	* CTU setting
152	* All input data will be converted to 2ch
153	* as output data
154	*/
155	convert-channels = <2>;
156	...
157	cpu {
158	sound-dai = <&rcar_sound>;
159	};
160	codec {
161	...
162	};
163	};
164
165	Ex) Exchange output channel
166	Input -> Output
167	1ch -> 0ch
168	0ch -> 1ch
169
170	example of using matrix
171	output 0ch = (input 0ch x 0) + (input 1ch x 1)
172	output 1ch = (input 0ch x 1) + (input 1ch x 0)
173
174	amixer set "CTU Reset" on
175	amixer set "CTU Pass" 9,10
176	amixer set "CTU SV0" 0,4194304
177	amixer set "CTU SV1" 4194304,0
178
179	example of changing connection
180	amixer set "CTU Reset" on
181	amixer set "CTU Pass" 2,1
182
183	=============================================
184	* MIX (Mixer)
185	=============================================
186
187	MIX merges 2 sounds path. You can see 2 sound interface on system,
188	and these sounds will be merged by MIX.
189
190	aplay -D plughw:0,0 xxxx.wav &
191	aplay -D plughw:0,1 yyyy.wav
192
193	You need to use "renesas,rsrc-card" sound card for it.
194	Ex)
195	[MEM] -> [SRC1] -> [CTU02] -+-> [MIX0] -> [DVC0] -> [SSI0]
196	\|
197	[MEM] -> [SRC2] -> [CTU03] -+
198
199	sound {
200	compatible = "renesas,rsrc-card";
201	...
202	cpu@0 {
203	sound-dai = <&rcar_sound 0>;
204	};
205	cpu@1 {
206	sound-dai = <&rcar_sound 1>;
207	};
208	codec {
209	...
210	};
211	};
212
213	&rcar_sound {
214	...
215	rcar_sound,dai {
216	dai0 {
217	playback = <&src1 &ctu02 &mix0 &dvc0 &ssi0>;
218	};
219	dai1 {
220	playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;
221	};
222	};
223	};
224
225	=============================================
226	* DVC (Digital Volume and Mute Function)
227	=============================================
228
229	DVC controls Playback/Capture volume.
230
231	Playback Volume
232	amixer set "DVC Out" 100%
233
234	Capture Volume
235	amixer set "DVC In" 100%
236
237	Playback Mute
238	amixer set "DVC Out Mute" on
239
240	Capture Mute
241	amixer set "DVC In Mute" on
242
243	Volume Ramp
244	amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
245	amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
246	amixer set "DVC Out Ramp" on
247	aplay xxx.wav &
248	amixer set "DVC Out" 80% // Volume Down
249	amixer set "DVC Out" 100% // Volume Up
250
251	=============================================
252	* SSIU (Serial Sound Interface Unit)
253	=============================================
254
255	There is no DT settings for SSIU, because SSIU will be automatically
256	selected via SSI.
257	SSIU can avoid some under/over run error, because it has some buffer.
258	But you can't use it if SSI was PIO mode.
259	In DMA mode, you can select not to use SSIU by using "no-busif" on DT.
260
261	&ssi0 {
262	no-busif;
263	};
264
265	=============================================
266	* SSI (Serial Sound Interface)
267	=============================================
268
269	** PIO mode
270
271	You can use PIO mode which is for connection check by using.
272	Note: The system will drop non-SSI modules in PIO mode
273	even though if DT is selecting other modules.
274
275	&ssi0 {
276	pio-transfer
277	};
278
279	** DMA mode without SSIU
280
281	You can use DMA without SSIU.
282	Note: under/over run, or noise are likely to occur
283
284	&ssi0 {
285	no-busif;
286	};
287
288	** PIN sharing
289
290	Each SSI can share WS pin. It is based on platform.
291	This is example if SSI1 want to share WS pin with SSI0
292
293	&ssi1 {
294	shared-pin;
295	};
296
297	** Multi-SSI
298
299	You can use Multi-SSI.
300	This is example of SSI0/SSI1/SSI2 (= for 6ch)
301
302	&rcar_sound {
303	...
304	rcar_sound,dai {
305	dai0 {
306	playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>;
307	};
308	};
309	};
310
311	** TDM-SSI
312
313	You can use TDM with SSI.
314	This is example of TDM 6ch.
315	Driver can automatically switches TDM <-> stereo mode in this case.
316
317	rsnd_tdm: sound {
318	compatible = "simple-audio-card";
319	...
320	simple-audio-card,cpu {
321	/* system can use TDM 6ch */
322	dai-tdm-slot-num = <6>;
323	sound-dai = <&rcar_sound>;
324	};
325	simple-audio-card,codec {
326	...
327	};
328	};
329
330
331	=============================================
90e8e50f	332	Required properties:
f1511a14 KM	333	=============================================
f1511a14 KM	334
56ba98ac GU	335	- compatible : "renesas,rcar_sound-<soctype>", fallbacks
56ba98ac GU	336	"renesas,rcar_sound-gen1" if generation1, and
90e8e50f	337	"renesas,rcar_sound-gen2" if generation2
ac37a45b	338	"renesas,rcar_sound-gen3" if generation3
56ba98ac	339	Examples with soctypes are:
7667f716	340	- "renesas,rcar_sound-r8a7778" (R-Car M1A)
4eb404d0	341	- "renesas,rcar_sound-r8a7779" (R-Car H1)
56ba98ac GU	342	- "renesas,rcar_sound-r8a7790" (R-Car H2)
56ba98ac GU	343	- "renesas,rcar_sound-r8a7791" (R-Car M2-W)
4eb404d0 SH	344	- "renesas,rcar_sound-r8a7793" (R-Car M2-N)
4eb404d0 SH	345	- "renesas,rcar_sound-r8a7794" (R-Car E2)
ac37a45b	346	- "renesas,rcar_sound-r8a7795" (R-Car H3)
90e8e50f KM	347	- reg : Should contain the register physical address.
	348	required register is
	349	SRU/ADG/SSI if generation1
	350	SRU/ADG/SSIU/SSI if generation2
8bab0dd5 KM	351	- rcar_sound,ssi : Should contain SSI feature.
	352	The number of SSI subnode should be same as HW.
	353	see below for detail.
	354	- rcar_sound,src : Should contain SRC feature.
	355	The number of SRC subnode should be same as HW.
	356	see below for detail.
9269e3c3 KM	357	- rcar_sound,ctu : Should contain CTU feature.
	358	The number of CTU subnode should be same as HW.
	359	see below for detail.
70fb1052 KM	360	- rcar_sound,mix : Should contain MIX feature.
	361	The number of MIX subnode should be same as HW.
	362	see below for detail.
34cb6123 KM	363	- rcar_sound,dvc : Should contain DVC feature.
	364	The number of DVC subnode should be same as HW.
	365	see below for detail.
8bab0dd5 KM	366	- rcar_sound,dai : DAI contents.
	367	The number of DAI subnode should be same as HW.
	368	see below for detail.
e3d2cec8 KM	369	- #sound-dai-cells : it must be 0 if your system is using single DAI
e3d2cec8 KM	370	it must be 1 if your system is using multi DAI
209c0907 KM	371
209c0907 KM	372	Optional properties:
2a46db4a KM	373	- #clock-cells : it must be 0 if your system has audio_clkout
	374	it must be 1 if your system has audio_clkout0/1/2/3
	375	- clock-frequency : for all audio_clkout0/1/2/3
7dc20319 KM	376	- clkout-lr-asynchronous : boolean property. it indicates that audio_clkoutn
7dc20319 KM	377	is asynchronizes with lr-clock.
90e8e50f KM	378
	379	SSI subnode properties:
	380	- interrupts : Should contain SSI interrupt for PIO transfer
	381	- shared-pin : if shared clock pin
199e7688	382	- pio-transfer : use PIO transfer mode
d9288d0b	383	- no-busif : BUSIF is not ussed when [mem -> SSI] via DMA case
e80a2fb1 KM	384	- dma : Should contain Audio DMAC entry
	385	- dma-names : SSI case "rx" (=playback), "tx" (=capture)
	386	SSIU case "rxu" (=playback), "txu" (=capture)
90e8e50f	387
8bab0dd5	388	SRC subnode properties:
e80a2fb1 KM	389	- dma : Should contain Audio DMAC entry
	390	- dma-names : "rx" (=playback), "tx" (=capture)
	391
	392	DVC subnode properties:
	393	- dma : Should contain Audio DMAC entry
	394	- dma-names : "tx" (=playback/capture)
8bab0dd5	395
90e8e50f KM	396	DAI subnode properties:
	397	- playback : list of playback modules
	398	- capture : list of capture modules
	399
f1511a14 KM	400
f1511a14 KM	401	=============================================
90e8e50f	402	Example:
f1511a14	403	=============================================
90e8e50f	404
596f74ec	405	rcar_sound: sound@ec500000 {
90e8e50f	406	#sound-dai-cells = <1>;
56ba98ac	407	compatible = "renesas,rcar_sound-r8a7791", "renesas,rcar_sound-gen2";
90e8e50f KM	408	reg = <0 0xec500000 0 0x1000>, /* SCU */
	409	<0 0xec5a0000 0 0x100>, /* ADG */
	410	<0 0xec540000 0 0x1000>, /* SSIU */
d3b1c0ba KM	411	<0 0xec541000 0 0x1280>, /* SSI */
	412	<0 0xec740000 0 0x200>; /* Audio DMAC peri peri*/
	413	reg-names = "scu", "adg", "ssiu", "ssi", "audmapp";
90e8e50f	414
bb02714f KM	415	clocks = <&mstp10_clks R8A7790_CLK_SSI_ALL>,
	416	<&mstp10_clks R8A7790_CLK_SSI9>, <&mstp10_clks R8A7790_CLK_SSI8>,
	417	<&mstp10_clks R8A7790_CLK_SSI7>, <&mstp10_clks R8A7790_CLK_SSI6>,
	418	<&mstp10_clks R8A7790_CLK_SSI5>, <&mstp10_clks R8A7790_CLK_SSI4>,
	419	<&mstp10_clks R8A7790_CLK_SSI3>, <&mstp10_clks R8A7790_CLK_SSI2>,
	420	<&mstp10_clks R8A7790_CLK_SSI1>, <&mstp10_clks R8A7790_CLK_SSI0>,
	421	<&mstp10_clks R8A7790_CLK_SCU_SRC9>, <&mstp10_clks R8A7790_CLK_SCU_SRC8>,
	422	<&mstp10_clks R8A7790_CLK_SCU_SRC7>, <&mstp10_clks R8A7790_CLK_SCU_SRC6>,
	423	<&mstp10_clks R8A7790_CLK_SCU_SRC5>, <&mstp10_clks R8A7790_CLK_SCU_SRC4>,
	424	<&mstp10_clks R8A7790_CLK_SCU_SRC3>, <&mstp10_clks R8A7790_CLK_SCU_SRC2>,
	425	<&mstp10_clks R8A7790_CLK_SCU_SRC1>, <&mstp10_clks R8A7790_CLK_SCU_SRC0>,
	426	<&mstp10_clks R8A7790_CLK_SCU_DVC0>, <&mstp10_clks R8A7790_CLK_SCU_DVC1>,
	427	<&audio_clk_a>, <&audio_clk_b>, <&audio_clk_c>, <&m2_clk>;
	428	clock-names = "ssi-all",
	429	"ssi.9", "ssi.8", "ssi.7", "ssi.6", "ssi.5",
	430	"ssi.4", "ssi.3", "ssi.2", "ssi.1", "ssi.0",
	431	"src.9", "src.8", "src.7", "src.6", "src.5",
	432	"src.4", "src.3", "src.2", "src.1", "src.0",
	433	"dvc.0", "dvc.1",
	434	"clk_a", "clk_b", "clk_c", "clk_i";
	435
34cb6123	436	rcar_sound,dvc {
e80a2fb1 KM	437	dvc0: dvc@0 {
	438	dmas = <&audma0 0xbc>;
	439	dma-names = "tx";
	440	};
	441	dvc1: dvc@1 {
	442	dmas = <&audma0 0xbe>;
	443	dma-names = "tx";
	444	};
34cb6123 KM	445	};
34cb6123 KM	446
70fb1052 KM	447	rcar_sound,mix {
	448	mix0: mix@0 { };
	449	mix1: mix@1 { };
	450	};
	451
9269e3c3 KM	452	rcar_sound,ctu {
	453	ctu00: ctu@0 { };
	454	ctu01: ctu@1 { };
	455	ctu02: ctu@2 { };
	456	ctu03: ctu@3 { };
	457	ctu10: ctu@4 { };
	458	ctu11: ctu@5 { };
	459	ctu12: ctu@6 { };
	460	ctu13: ctu@7 { };
	461	};
	462
90e8e50f	463	rcar_sound,src {
5cf4f686 KM	464	src0: src@0 {
5cf4f686 KM	465	interrupts = <0 352 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	466	dmas = <&audma0 0x85>, <&audma1 0x9a>;
e80a2fb1 KM	467	dma-names = "rx", "tx";
5cf4f686 KM	468	};
	469	src1: src@1 {
	470	interrupts = <0 353 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	471	dmas = <&audma0 0x87>, <&audma1 0x9c>;
e80a2fb1 KM	472	dma-names = "rx", "tx";
5cf4f686 KM	473	};
	474	src2: src@2 {
	475	interrupts = <0 354 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	476	dmas = <&audma0 0x89>, <&audma1 0x9e>;
e80a2fb1 KM	477	dma-names = "rx", "tx";
5cf4f686 KM	478	};
	479	src3: src@3 {
	480	interrupts = <0 355 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	481	dmas = <&audma0 0x8b>, <&audma1 0xa0>;
e80a2fb1 KM	482	dma-names = "rx", "tx";
5cf4f686 KM	483	};
	484	src4: src@4 {
	485	interrupts = <0 356 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	486	dmas = <&audma0 0x8d>, <&audma1 0xb0>;
e80a2fb1 KM	487	dma-names = "rx", "tx";
5cf4f686 KM	488	};
	489	src5: src@5 {
	490	interrupts = <0 357 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	491	dmas = <&audma0 0x8f>, <&audma1 0xb2>;
e80a2fb1 KM	492	dma-names = "rx", "tx";
5cf4f686 KM	493	};
	494	src6: src@6 {
	495	interrupts = <0 358 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	496	dmas = <&audma0 0x91>, <&audma1 0xb4>;
e80a2fb1 KM	497	dma-names = "rx", "tx";
5cf4f686 KM	498	};
	499	src7: src@7 {
	500	interrupts = <0 359 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	501	dmas = <&audma0 0x93>, <&audma1 0xb6>;
e80a2fb1 KM	502	dma-names = "rx", "tx";
5cf4f686 KM	503	};
	504	src8: src@8 {
	505	interrupts = <0 360 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	506	dmas = <&audma0 0x95>, <&audma1 0xb8>;
e80a2fb1 KM	507	dma-names = "rx", "tx";
5cf4f686 KM	508	};
	509	src9: src@9 {
	510	interrupts = <0 361 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	511	dmas = <&audma0 0x97>, <&audma1 0xba>;
e80a2fb1 KM	512	dma-names = "rx", "tx";
5cf4f686	513	};
90e8e50f KM	514	};
	515
	516	rcar_sound,ssi {
	517	ssi0: ssi@0 {
	518	interrupts = <0 370 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	519	dmas = <&audma0 0x01>, <&audma1 0x02>, <&audma0 0x15>, <&audma1 0x16>;
e80a2fb1 KM	520	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	521	};
	522	ssi1: ssi@1 {
	523	interrupts = <0 371 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	524	dmas = <&audma0 0x03>, <&audma1 0x04>, <&audma0 0x49>, <&audma1 0x4a>;
e80a2fb1 KM	525	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	526	};
	527	ssi2: ssi@2 {
	528	interrupts = <0 372 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	529	dmas = <&audma0 0x05>, <&audma1 0x06>, <&audma0 0x63>, <&audma1 0x64>;
e80a2fb1 KM	530	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	531	};
	532	ssi3: ssi@3 {
	533	interrupts = <0 373 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	534	dmas = <&audma0 0x07>, <&audma1 0x08>, <&audma0 0x6f>, <&audma1 0x70>;
e80a2fb1 KM	535	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	536	};
	537	ssi4: ssi@4 {
	538	interrupts = <0 374 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	539	dmas = <&audma0 0x09>, <&audma1 0x0a>, <&audma0 0x71>, <&audma1 0x72>;
e80a2fb1 KM	540	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	541	};
	542	ssi5: ssi@5 {
	543	interrupts = <0 375 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	544	dmas = <&audma0 0x0b>, <&audma1 0x0c>, <&audma0 0x73>, <&audma1 0x74>;
e80a2fb1 KM	545	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	546	};
	547	ssi6: ssi@6 {
	548	interrupts = <0 376 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	549	dmas = <&audma0 0x0d>, <&audma1 0x0e>, <&audma0 0x75>, <&audma1 0x76>;
e80a2fb1 KM	550	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	551	};
	552	ssi7: ssi@7 {
	553	interrupts = <0 377 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	554	dmas = <&audma0 0x0f>, <&audma1 0x10>, <&audma0 0x79>, <&audma1 0x7a>;
e80a2fb1 KM	555	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	556	};
	557	ssi8: ssi@8 {
	558	interrupts = <0 378 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	559	dmas = <&audma0 0x11>, <&audma1 0x12>, <&audma0 0x7b>, <&audma1 0x7c>;
e80a2fb1 KM	560	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	561	};
	562	ssi9: ssi@9 {
	563	interrupts = <0 379 IRQ_TYPE_LEVEL_HIGH>;
e80a2fb1 KM	564	dmas = <&audma0 0x13>, <&audma1 0x14>, <&audma0 0x7d>, <&audma1 0x7e>;
e80a2fb1 KM	565	dma-names = "rx", "tx", "rxu", "txu";
90e8e50f KM	566	};
	567	};
	568
	569	rcar_sound,dai {
	570	dai0 {
	571	playback = <&ssi5 &src5>;
	572	capture = <&ssi6>;
	573	};
	574	dai1 {
	575	playback = <&ssi3>;
	576	};
	577	dai2 {
	578	capture = <&ssi4>;
	579	};
	580	dai3 {
	581	playback = <&ssi7>;
	582	};
	583	dai4 {
	584	capture = <&ssi8>;
	585	};
	586	};
	587	};
f3f17d32	588
f1511a14	589	=============================================
f3f17d32	590	Example: simple sound card
f1511a14	591	=============================================
f3f17d32 KM	592
	593	rsnd_ak4643: sound {
	594	compatible = "simple-audio-card";
	595
	596	simple-audio-card,format = "left_j";
	597	simple-audio-card,bitclock-master = <&sndcodec>;
	598	simple-audio-card,frame-master = <&sndcodec>;
	599
	600	sndcpu: simple-audio-card,cpu {
	601	sound-dai = <&rcar_sound>;
	602	};
	603
	604	sndcodec: simple-audio-card,codec {
	605	sound-dai = <&ak4643>;
	606	clocks = <&audio_clock>;
	607	};
	608	};
	609
	610	&rcar_sound {
	611	pinctrl-0 = <&sound_pins &sound_clk_pins>;
	612	pinctrl-names = "default";
	613
	614	/* Single DAI */
	615	#sound-dai-cells = <0>;
	616
	617	status = "okay";
	618
	619	rcar_sound,dai {
	620	dai0 {
	621	playback = <&ssi0 &src2 &dvc0>;
	622	capture = <&ssi1 &src3 &dvc1>;
	623	};
	624	};
	625	};
	626
	627	&ssi1 {
	628	shared-pin;
	629	};
44bf5361	630
f1511a14	631	=============================================
44bf5361	632	Example: simple sound card for TDM
f1511a14	633	=============================================
44bf5361 KM	634
	635	rsnd_tdm: sound {
	636	compatible = "simple-audio-card";
	637
	638	simple-audio-card,format = "left_j";
	639	simple-audio-card,bitclock-master = <&sndcodec>;
	640	simple-audio-card,frame-master = <&sndcodec>;
	641
	642	sndcpu: simple-audio-card,cpu {
	643	sound-dai = <&rcar_sound>;
	644	dai-tdm-slot-num = <6>;
	645	};
	646
	647	sndcodec: simple-audio-card,codec {
	648	sound-dai = <&xxx>;
	649	};
	650	};
b4c83b17	651
f1511a14	652	=============================================
b4c83b17	653	Example: simple sound card for Multi channel
f1511a14	654	=============================================
b4c83b17 KM	655
	656	&rcar_sound {
	657	pinctrl-0 = <&sound_pins &sound_clk_pins>;
	658	pinctrl-names = "default";
	659
	660	/* Single DAI */
	661	#sound-dai-cells = <0>;
	662
	663	status = "okay";
	664
	665	rcar_sound,dai {
	666	dai0 {
	667	playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>;
	668	};
	669	};
	670	};