1Renesas R-Car sound 2 3============================================= 4* Modules 5============================================= 6 7Renesas R-Car and RZ/G 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 19See detail of each module's channels, connection, limitation on datasheet 20 21============================================= 22* Multi channel 23============================================= 24 25Multi 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 34See datasheet to check SRC/CTU/MIX/DVC connect-limitation. 35DT controls enabling/disabling module. 36${LINUX}/arch/arm/boot/dts/r8a7790-lager.dts can be good example. 37This is example of 38 39Playback: [MEM] -> [SRC2] -> [DVC0] -> [SSIU0/SSI0] -> [codec] 40Capture: [MEM] <- [DVC1] <- [SRC3] <- [SSIU1/SSI1] <- [codec] 41 42 &rcar_sound { 43 ... 44 rcar_sound,dai { 45 dai0 { 46 playback = <&ssi0 &src2 &dvc0>; 47 capture = <&ssi1 &src3 &dvc1>; 48 }; 49 }; 50 }; 51 52You can use below. 53${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 73SRC 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 86You need to use "simple-scu-audio-card" sound card for it. 87example) 88 89 sound { 90 compatible = "simple-scu-audio-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 simple-audio-card,convert-rate = <48000>; 101 ... 102 simple-audio-card,cpu { 103 sound-dai = <&rcar_sound>; 104 }; 105 simple-audio-card,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 126CTU can convert [xx]ch to [yy]ch, or exchange outputed channel. 127CTU conversion needs matrix settings. 128For 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 144You need to use "simple-scu-audio-card" sound card for it. 145example) 146 147 sound { 148 compatible = "simple-scu-audio-card"; 149 ... 150 /* 151 * CTU setting 152 * All input data will be converted to 2ch 153 * as output data 154 */ 155 simple-audio-card,convert-channels = <2>; 156 ... 157 simple-audio-card,cpu { 158 sound-dai = <&rcar_sound>; 159 }; 160 simple-audio-card,codec { 161 ... 162 }; 163 }; 164 165Ex) 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 187MIX merges 2 sounds path. You can see 2 sound interface on system, 188and 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 193You need to use "simple-scu-audio-card" sound card for it. 194Ex) 195 [MEM] -> [SRC1] -> [CTU02] -+-> [MIX0] -> [DVC0] -> [SSI0] 196 | 197 [MEM] -> [SRC2] -> [CTU03] -+ 198 199 sound { 200 #address-cells = <1>; 201 #size-cells = <0>; 202 203 compatible = "simple-scu-audio-card"; 204 ... 205 simple-audio-card,cpu@0 { 206 reg = <0>; 207 sound-dai = <&rcar_sound 0>; 208 }; 209 simple-audio-card,cpu@1 { 210 reg = <1>; 211 sound-dai = <&rcar_sound 1>; 212 }; 213 simple-audio-card,codec { 214 ... 215 }; 216 }; 217 218 &rcar_sound { 219 ... 220 rcar_sound,dai { 221 dai0 { 222 playback = <&src1 &ctu02 &mix0 &dvc0 &ssi0>; 223 }; 224 dai1 { 225 playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>; 226 }; 227 }; 228 }; 229 230============================================= 231* DVC (Digital Volume and Mute Function) 232============================================= 233 234DVC controls Playback/Capture volume. 235 236Playback Volume 237 amixer set "DVC Out" 100% 238 239Capture Volume 240 amixer set "DVC In" 100% 241 242Playback Mute 243 amixer set "DVC Out Mute" on 244 245Capture Mute 246 amixer set "DVC In Mute" on 247 248Volume Ramp 249 amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps" 250 amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps" 251 amixer set "DVC Out Ramp" on 252 aplay xxx.wav & 253 amixer set "DVC Out" 80% // Volume Down 254 amixer set "DVC Out" 100% // Volume Up 255 256============================================= 257* SSIU (Serial Sound Interface Unit) 258============================================= 259 260There is no DT settings for SSIU, because SSIU will be automatically 261selected via SSI. 262SSIU can avoid some under/over run error, because it has some buffer. 263But you can't use it if SSI was PIO mode. 264In DMA mode, you can select not to use SSIU by using "no-busif" on DT. 265 266 &ssi0 { 267 no-busif; 268 }; 269 270============================================= 271* SSI (Serial Sound Interface) 272============================================= 273 274** PIO mode 275 276You can use PIO mode which is for connection check by using. 277Note: The system will drop non-SSI modules in PIO mode 278even though if DT is selecting other modules. 279 280 &ssi0 { 281 pio-transfer 282 }; 283 284** DMA mode without SSIU 285 286You can use DMA without SSIU. 287Note: under/over run, or noise are likely to occur 288 289 &ssi0 { 290 no-busif; 291 }; 292 293** PIN sharing 294 295Each SSI can share WS pin. It is based on platform. 296This is example if SSI1 want to share WS pin with SSI0 297 298 &ssi1 { 299 shared-pin; 300 }; 301 302** Multi-SSI 303 304You can use Multi-SSI. 305This is example of SSI0/SSI1/SSI2 (= for 6ch) 306 307 &rcar_sound { 308 ... 309 rcar_sound,dai { 310 dai0 { 311 playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>; 312 }; 313 }; 314 }; 315 316** TDM-SSI 317 318You can use TDM with SSI. 319This is example of TDM 6ch. 320Driver can automatically switches TDM <-> stereo mode in this case. 321 322 rsnd_tdm: sound { 323 compatible = "simple-audio-card"; 324 ... 325 simple-audio-card,cpu { 326 /* system can use TDM 6ch */ 327 dai-tdm-slot-num = <6>; 328 sound-dai = <&rcar_sound>; 329 }; 330 simple-audio-card,codec { 331 ... 332 }; 333 }; 334 335 336============================================= 337Required properties: 338============================================= 339 340- compatible : "renesas,rcar_sound-<soctype>", fallbacks 341 "renesas,rcar_sound-gen1" if generation1, and 342 "renesas,rcar_sound-gen2" if generation2 (or RZ/G1) 343 "renesas,rcar_sound-gen3" if generation3 (or RZ/G2) 344 Examples with soctypes are: 345 - "renesas,rcar_sound-r8a7743" (RZ/G1M) 346 - "renesas,rcar_sound-r8a7744" (RZ/G1N) 347 - "renesas,rcar_sound-r8a7745" (RZ/G1E) 348 - "renesas,rcar_sound-r8a774a1" (RZ/G2M) 349 - "renesas,rcar_sound-r8a7778" (R-Car M1A) 350 - "renesas,rcar_sound-r8a7779" (R-Car H1) 351 - "renesas,rcar_sound-r8a7790" (R-Car H2) 352 - "renesas,rcar_sound-r8a7791" (R-Car M2-W) 353 - "renesas,rcar_sound-r8a7793" (R-Car M2-N) 354 - "renesas,rcar_sound-r8a7794" (R-Car E2) 355 - "renesas,rcar_sound-r8a7795" (R-Car H3) 356 - "renesas,rcar_sound-r8a7796" (R-Car M3-W) 357 - "renesas,rcar_sound-r8a77965" (R-Car M3-N) 358 - "renesas,rcar_sound-r8a77990" (R-Car E3) 359- reg : Should contain the register physical address. 360 required register is 361 SRU/ADG/SSI if generation1 362 SRU/ADG/SSIU/SSI if generation2 363- rcar_sound,ssi : Should contain SSI feature. 364 The number of SSI subnode should be same as HW. 365 see below for detail. 366- rcar_sound,src : Should contain SRC feature. 367 The number of SRC subnode should be same as HW. 368 see below for detail. 369- rcar_sound,ctu : Should contain CTU feature. 370 The number of CTU subnode should be same as HW. 371 see below for detail. 372- rcar_sound,mix : Should contain MIX feature. 373 The number of MIX subnode should be same as HW. 374 see below for detail. 375- rcar_sound,dvc : Should contain DVC feature. 376 The number of DVC subnode should be same as HW. 377 see below for detail. 378- rcar_sound,dai : DAI contents. 379 The number of DAI subnode should be same as HW. 380 see below for detail. 381- #sound-dai-cells : it must be 0 if your system is using single DAI 382 it must be 1 if your system is using multi DAI 383- clocks : References to SSI/SRC/MIX/CTU/DVC/AUDIO_CLK clocks. 384- clock-names : List of necessary clock names. 385 "ssi-all", "ssi.X", "src.X", "mix.X", "ctu.X", 386 "dvc.X", "clk_a", "clk_b", "clk_c", "clk_i" 387 388Optional properties: 389- #clock-cells : it must be 0 if your system has audio_clkout 390 it must be 1 if your system has audio_clkout0/1/2/3 391- clock-frequency : for all audio_clkout0/1/2/3 392- clkout-lr-asynchronous : boolean property. it indicates that audio_clkoutn 393 is asynchronizes with lr-clock. 394- resets : References to SSI resets. 395- reset-names : List of valid reset names. 396 "ssi-all", "ssi.X" 397 398SSI subnode properties: 399- interrupts : Should contain SSI interrupt for PIO transfer 400- shared-pin : if shared clock pin 401- pio-transfer : use PIO transfer mode 402- no-busif : BUSIF is not ussed when [mem -> SSI] via DMA case 403- dma : Should contain Audio DMAC entry 404- dma-names : SSI case "rx" (=playback), "tx" (=capture) 405 SSIU case "rxu" (=playback), "txu" (=capture) 406 407SRC subnode properties: 408- dma : Should contain Audio DMAC entry 409- dma-names : "rx" (=playback), "tx" (=capture) 410 411DVC subnode properties: 412- dma : Should contain Audio DMAC entry 413- dma-names : "tx" (=playback/capture) 414 415DAI subnode properties: 416- playback : list of playback modules 417- capture : list of capture modules 418 419 420============================================= 421Example: 422============================================= 423 424rcar_sound: sound@ec500000 { 425 #sound-dai-cells = <1>; 426 compatible = "renesas,rcar_sound-r8a7791", "renesas,rcar_sound-gen2"; 427 reg = <0 0xec500000 0 0x1000>, /* SCU */ 428 <0 0xec5a0000 0 0x100>, /* ADG */ 429 <0 0xec540000 0 0x1000>, /* SSIU */ 430 <0 0xec541000 0 0x1280>, /* SSI */ 431 <0 0xec740000 0 0x200>; /* Audio DMAC peri peri*/ 432 reg-names = "scu", "adg", "ssiu", "ssi", "audmapp"; 433 434 clocks = <&mstp10_clks R8A7790_CLK_SSI_ALL>, 435 <&mstp10_clks R8A7790_CLK_SSI9>, <&mstp10_clks R8A7790_CLK_SSI8>, 436 <&mstp10_clks R8A7790_CLK_SSI7>, <&mstp10_clks R8A7790_CLK_SSI6>, 437 <&mstp10_clks R8A7790_CLK_SSI5>, <&mstp10_clks R8A7790_CLK_SSI4>, 438 <&mstp10_clks R8A7790_CLK_SSI3>, <&mstp10_clks R8A7790_CLK_SSI2>, 439 <&mstp10_clks R8A7790_CLK_SSI1>, <&mstp10_clks R8A7790_CLK_SSI0>, 440 <&mstp10_clks R8A7790_CLK_SCU_SRC9>, <&mstp10_clks R8A7790_CLK_SCU_SRC8>, 441 <&mstp10_clks R8A7790_CLK_SCU_SRC7>, <&mstp10_clks R8A7790_CLK_SCU_SRC6>, 442 <&mstp10_clks R8A7790_CLK_SCU_SRC5>, <&mstp10_clks R8A7790_CLK_SCU_SRC4>, 443 <&mstp10_clks R8A7790_CLK_SCU_SRC3>, <&mstp10_clks R8A7790_CLK_SCU_SRC2>, 444 <&mstp10_clks R8A7790_CLK_SCU_SRC1>, <&mstp10_clks R8A7790_CLK_SCU_SRC0>, 445 <&mstp10_clks R8A7790_CLK_SCU_DVC0>, <&mstp10_clks R8A7790_CLK_SCU_DVC1>, 446 <&audio_clk_a>, <&audio_clk_b>, <&audio_clk_c>, <&m2_clk>; 447 clock-names = "ssi-all", 448 "ssi.9", "ssi.8", "ssi.7", "ssi.6", "ssi.5", 449 "ssi.4", "ssi.3", "ssi.2", "ssi.1", "ssi.0", 450 "src.9", "src.8", "src.7", "src.6", "src.5", 451 "src.4", "src.3", "src.2", "src.1", "src.0", 452 "dvc.0", "dvc.1", 453 "clk_a", "clk_b", "clk_c", "clk_i"; 454 455 rcar_sound,dvc { 456 dvc0: dvc-0 { 457 dmas = <&audma0 0xbc>; 458 dma-names = "tx"; 459 }; 460 dvc1: dvc-1 { 461 dmas = <&audma0 0xbe>; 462 dma-names = "tx"; 463 }; 464 }; 465 466 rcar_sound,mix { 467 mix0: mix-0 { }; 468 mix1: mix-1 { }; 469 }; 470 471 rcar_sound,ctu { 472 ctu00: ctu-0 { }; 473 ctu01: ctu-1 { }; 474 ctu02: ctu-2 { }; 475 ctu03: ctu-3 { }; 476 ctu10: ctu-4 { }; 477 ctu11: ctu-5 { }; 478 ctu12: ctu-6 { }; 479 ctu13: ctu-7 { }; 480 }; 481 482 rcar_sound,src { 483 src0: src-0 { 484 interrupts = <0 352 IRQ_TYPE_LEVEL_HIGH>; 485 dmas = <&audma0 0x85>, <&audma1 0x9a>; 486 dma-names = "rx", "tx"; 487 }; 488 src1: src-1 { 489 interrupts = <0 353 IRQ_TYPE_LEVEL_HIGH>; 490 dmas = <&audma0 0x87>, <&audma1 0x9c>; 491 dma-names = "rx", "tx"; 492 }; 493 src2: src-2 { 494 interrupts = <0 354 IRQ_TYPE_LEVEL_HIGH>; 495 dmas = <&audma0 0x89>, <&audma1 0x9e>; 496 dma-names = "rx", "tx"; 497 }; 498 src3: src-3 { 499 interrupts = <0 355 IRQ_TYPE_LEVEL_HIGH>; 500 dmas = <&audma0 0x8b>, <&audma1 0xa0>; 501 dma-names = "rx", "tx"; 502 }; 503 src4: src-4 { 504 interrupts = <0 356 IRQ_TYPE_LEVEL_HIGH>; 505 dmas = <&audma0 0x8d>, <&audma1 0xb0>; 506 dma-names = "rx", "tx"; 507 }; 508 src5: src-5 { 509 interrupts = <0 357 IRQ_TYPE_LEVEL_HIGH>; 510 dmas = <&audma0 0x8f>, <&audma1 0xb2>; 511 dma-names = "rx", "tx"; 512 }; 513 src6: src-6 { 514 interrupts = <0 358 IRQ_TYPE_LEVEL_HIGH>; 515 dmas = <&audma0 0x91>, <&audma1 0xb4>; 516 dma-names = "rx", "tx"; 517 }; 518 src7: src-7 { 519 interrupts = <0 359 IRQ_TYPE_LEVEL_HIGH>; 520 dmas = <&audma0 0x93>, <&audma1 0xb6>; 521 dma-names = "rx", "tx"; 522 }; 523 src8: src-8 { 524 interrupts = <0 360 IRQ_TYPE_LEVEL_HIGH>; 525 dmas = <&audma0 0x95>, <&audma1 0xb8>; 526 dma-names = "rx", "tx"; 527 }; 528 src9: src-9 { 529 interrupts = <0 361 IRQ_TYPE_LEVEL_HIGH>; 530 dmas = <&audma0 0x97>, <&audma1 0xba>; 531 dma-names = "rx", "tx"; 532 }; 533 }; 534 535 rcar_sound,ssi { 536 ssi0: ssi-0 { 537 interrupts = <0 370 IRQ_TYPE_LEVEL_HIGH>; 538 dmas = <&audma0 0x01>, <&audma1 0x02>, <&audma0 0x15>, <&audma1 0x16>; 539 dma-names = "rx", "tx", "rxu", "txu"; 540 }; 541 ssi1: ssi-1 { 542 interrupts = <0 371 IRQ_TYPE_LEVEL_HIGH>; 543 dmas = <&audma0 0x03>, <&audma1 0x04>, <&audma0 0x49>, <&audma1 0x4a>; 544 dma-names = "rx", "tx", "rxu", "txu"; 545 }; 546 ssi2: ssi-2 { 547 interrupts = <0 372 IRQ_TYPE_LEVEL_HIGH>; 548 dmas = <&audma0 0x05>, <&audma1 0x06>, <&audma0 0x63>, <&audma1 0x64>; 549 dma-names = "rx", "tx", "rxu", "txu"; 550 }; 551 ssi3: ssi-3 { 552 interrupts = <0 373 IRQ_TYPE_LEVEL_HIGH>; 553 dmas = <&audma0 0x07>, <&audma1 0x08>, <&audma0 0x6f>, <&audma1 0x70>; 554 dma-names = "rx", "tx", "rxu", "txu"; 555 }; 556 ssi4: ssi-4 { 557 interrupts = <0 374 IRQ_TYPE_LEVEL_HIGH>; 558 dmas = <&audma0 0x09>, <&audma1 0x0a>, <&audma0 0x71>, <&audma1 0x72>; 559 dma-names = "rx", "tx", "rxu", "txu"; 560 }; 561 ssi5: ssi-5 { 562 interrupts = <0 375 IRQ_TYPE_LEVEL_HIGH>; 563 dmas = <&audma0 0x0b>, <&audma1 0x0c>, <&audma0 0x73>, <&audma1 0x74>; 564 dma-names = "rx", "tx", "rxu", "txu"; 565 }; 566 ssi6: ssi-6 { 567 interrupts = <0 376 IRQ_TYPE_LEVEL_HIGH>; 568 dmas = <&audma0 0x0d>, <&audma1 0x0e>, <&audma0 0x75>, <&audma1 0x76>; 569 dma-names = "rx", "tx", "rxu", "txu"; 570 }; 571 ssi7: ssi-7 { 572 interrupts = <0 377 IRQ_TYPE_LEVEL_HIGH>; 573 dmas = <&audma0 0x0f>, <&audma1 0x10>, <&audma0 0x79>, <&audma1 0x7a>; 574 dma-names = "rx", "tx", "rxu", "txu"; 575 }; 576 ssi8: ssi-8 { 577 interrupts = <0 378 IRQ_TYPE_LEVEL_HIGH>; 578 dmas = <&audma0 0x11>, <&audma1 0x12>, <&audma0 0x7b>, <&audma1 0x7c>; 579 dma-names = "rx", "tx", "rxu", "txu"; 580 }; 581 ssi9: ssi-9 { 582 interrupts = <0 379 IRQ_TYPE_LEVEL_HIGH>; 583 dmas = <&audma0 0x13>, <&audma1 0x14>, <&audma0 0x7d>, <&audma1 0x7e>; 584 dma-names = "rx", "tx", "rxu", "txu"; 585 }; 586 }; 587 588 rcar_sound,dai { 589 dai0 { 590 playback = <&ssi5 &src5>; 591 capture = <&ssi6>; 592 }; 593 dai1 { 594 playback = <&ssi3>; 595 }; 596 dai2 { 597 capture = <&ssi4>; 598 }; 599 dai3 { 600 playback = <&ssi7>; 601 }; 602 dai4 { 603 capture = <&ssi8>; 604 }; 605 }; 606}; 607 608============================================= 609Example: simple sound card 610============================================= 611 612 rsnd_ak4643: sound { 613 compatible = "simple-audio-card"; 614 615 simple-audio-card,format = "left_j"; 616 simple-audio-card,bitclock-master = <&sndcodec>; 617 simple-audio-card,frame-master = <&sndcodec>; 618 619 sndcpu: simple-audio-card,cpu { 620 sound-dai = <&rcar_sound>; 621 }; 622 623 sndcodec: simple-audio-card,codec { 624 sound-dai = <&ak4643>; 625 clocks = <&audio_clock>; 626 }; 627 }; 628 629&rcar_sound { 630 pinctrl-0 = <&sound_pins &sound_clk_pins>; 631 pinctrl-names = "default"; 632 633 /* Single DAI */ 634 #sound-dai-cells = <0>; 635 636 637 rcar_sound,dai { 638 dai0 { 639 playback = <&ssi0 &src2 &dvc0>; 640 capture = <&ssi1 &src3 &dvc1>; 641 }; 642 }; 643}; 644 645&ssi1 { 646 shared-pin; 647}; 648 649============================================= 650Example: simple sound card for TDM 651============================================= 652 653 rsnd_tdm: sound { 654 compatible = "simple-audio-card"; 655 656 simple-audio-card,format = "left_j"; 657 simple-audio-card,bitclock-master = <&sndcodec>; 658 simple-audio-card,frame-master = <&sndcodec>; 659 660 sndcpu: simple-audio-card,cpu { 661 sound-dai = <&rcar_sound>; 662 dai-tdm-slot-num = <6>; 663 }; 664 665 sndcodec: simple-audio-card,codec { 666 sound-dai = <&xxx>; 667 }; 668 }; 669 670============================================= 671Example: simple sound card for Multi channel 672============================================= 673 674&rcar_sound { 675 pinctrl-0 = <&sound_pins &sound_clk_pins>; 676 pinctrl-names = "default"; 677 678 /* Single DAI */ 679 #sound-dai-cells = <0>; 680 681 682 rcar_sound,dai { 683 dai0 { 684 playback = <&ssi0 &ssi1 &ssi2 &src0 &dvc0>; 685 }; 686 }; 687}; 688