sound/soc/sh/rcar/src.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Renesas R-Car SRC support
   4 //
   5 // Copyright (C) 2013 Renesas Solutions Corp.
   6 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7
   8 /*
   9  * You can use Synchronous Sampling Rate Convert (if no DVC)
  10  *
  11  *      amixer set "SRC Out Rate" on
  12  *      aplay xxx.wav &
  13  *      amixer set "SRC Out Rate" 96000 // convert rate to 96000Hz
  14  *      amixer set "SRC Out Rate" 22050 // convert rate to 22050Hz
  15  */
  16
  17 /*
  18  * you can enable below define if you don't need
  19  * SSI interrupt status debug message when debugging
  20  * see rsnd_print_irq_status()
  21  *
  22  * #define RSND_DEBUG_NO_IRQ_STATUS 1
  23  */
  24
  25 #include <linux/of_irq.h>
  26 #include "rsnd.h"
  27
  28 #define SRC_NAME "src"
  29
  30 /* SCU_SYSTEM_STATUS0/1 */
  31 #define OUF_SRC(id)     ((1 << (id + 16)) | (1 << id))
  32
  33 struct rsnd_src {
  34         struct rsnd_mod mod;
  35         struct rsnd_mod *dma;
  36         struct rsnd_kctrl_cfg_s sen;  /* sync convert enable */
  37         struct rsnd_kctrl_cfg_s sync; /* sync convert */
  38         int irq;
  39 };
  40
  41 #define RSND_SRC_NAME_SIZE 16
  42
  43 #define rsnd_src_get(priv, id) ((struct rsnd_src *)(priv->src) + id)
  44 #define rsnd_src_nr(priv) ((priv)->src_nr)
  45 #define rsnd_src_sync_is_enabled(mod) (rsnd_mod_to_src(mod)->sen.val)
  46
  47 #define rsnd_mod_to_src(_mod)                           \
  48         container_of((_mod), struct rsnd_src, mod)
  49
  50 #define for_each_rsnd_src(pos, priv, i)                         \
  51         for ((i) = 0;                                           \
  52              ((i) < rsnd_src_nr(priv)) &&                       \
  53              ((pos) = (struct rsnd_src *)(priv)->src + i);      \
  54              i++)
  55
  56
  57 /*
  58  *              image of SRC (Sampling Rate Converter)
  59  *
  60  * 96kHz   <-> +-----+  48kHz   +-----+  48kHz  +-------+
  61  * 48kHz   <-> | SRC | <------> | SSI | <-----> | codec |
  62  * 44.1kHz <-> +-----+          +-----+         +-------+
  63  * ...
  64  *
  65  */
  66
  67 static void rsnd_src_activation(struct rsnd_mod *mod)
  68 {
  69         rsnd_mod_write(mod, SRC_SWRSR, 0);
  70         rsnd_mod_write(mod, SRC_SWRSR, 1);
  71 }
  72
  73 static void rsnd_src_halt(struct rsnd_mod *mod)
  74 {
  75         rsnd_mod_write(mod, SRC_SRCIR, 1);
  76         rsnd_mod_write(mod, SRC_SWRSR, 0);
  77 }
  78
  79 static struct dma_chan *rsnd_src_dma_req(struct rsnd_dai_stream *io,
  80                                          struct rsnd_mod *mod)
  81 {
  82         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
  83         int is_play = rsnd_io_is_play(io);
  84
  85         return rsnd_dma_request_channel(rsnd_src_of_node(priv),
  86                                         SRC_NAME, mod,
  87                                         is_play ? "rx" : "tx");
  88 }
  89
  90 static u32 rsnd_src_convert_rate(struct rsnd_dai_stream *io,
  91                                  struct rsnd_mod *mod)
  92 {
  93         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
  94         struct rsnd_src *src = rsnd_mod_to_src(mod);
  95         u32 convert_rate;
  96
  97         if (!runtime)
  98                 return 0;
  99
 100         if (!rsnd_src_sync_is_enabled(mod))
 101                 return rsnd_io_converted_rate(io);
 102
 103         convert_rate = src->sync.val;
 104
 105         if (!convert_rate)
 106                 convert_rate = rsnd_io_converted_rate(io);
 107
 108         if (!convert_rate)
 109                 convert_rate = runtime->rate;
 110
 111         return convert_rate;
 112 }
 113
 114 unsigned int rsnd_src_get_rate(struct rsnd_priv *priv,
 115                                struct rsnd_dai_stream *io,
 116                                int is_in)
 117 {
 118         struct rsnd_mod *src_mod = rsnd_io_to_mod_src(io);
 119         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 120         unsigned int rate = 0;
 121         int is_play = rsnd_io_is_play(io);
 122
 123         /*
 124          * Playback
 125          * runtime_rate -> [SRC] -> convert_rate
 126          *
 127          * Capture
 128          * convert_rate -> [SRC] -> runtime_rate
 129          */
 130
 131         if (is_play == is_in)
 132                 return runtime->rate;
 133
 134         /*
 135          * return convert rate if SRC is used,
 136          * otherwise, return runtime->rate as usual
 137          */
 138         if (src_mod)
 139                 rate = rsnd_src_convert_rate(io, src_mod);
 140
 141         if (!rate)
 142                 rate = runtime->rate;
 143
 144         return rate;
 145 }
 146
 147 static const u32 bsdsr_table_pattern1[] = {
 148         0x01800000, /* 6 - 1/6 */
 149         0x01000000, /* 6 - 1/4 */
 150         0x00c00000, /* 6 - 1/3 */
 151         0x00800000, /* 6 - 1/2 */
 152         0x00600000, /* 6 - 2/3 */
 153         0x00400000, /* 6 - 1   */
 154 };
 155
 156 static const u32 bsdsr_table_pattern2[] = {
 157         0x02400000, /* 6 - 1/6 */
 158         0x01800000, /* 6 - 1/4 */
 159         0x01200000, /* 6 - 1/3 */
 160         0x00c00000, /* 6 - 1/2 */
 161         0x00900000, /* 6 - 2/3 */
 162         0x00600000, /* 6 - 1   */
 163 };
 164
 165 static const u32 bsisr_table[] = {
 166         0x00100060, /* 6 - 1/6 */
 167         0x00100040, /* 6 - 1/4 */
 168         0x00100030, /* 6 - 1/3 */
 169         0x00100020, /* 6 - 1/2 */
 170         0x00100020, /* 6 - 2/3 */
 171         0x00100020, /* 6 - 1   */
 172 };
 173
 174 static const u32 chan288888[] = {
 175         0x00000006, /* 1 to 2 */
 176         0x000001fe, /* 1 to 8 */
 177         0x000001fe, /* 1 to 8 */
 178         0x000001fe, /* 1 to 8 */
 179         0x000001fe, /* 1 to 8 */
 180         0x000001fe, /* 1 to 8 */
 181 };
 182
 183 static const u32 chan244888[] = {
 184         0x00000006, /* 1 to 2 */
 185         0x0000001e, /* 1 to 4 */
 186         0x0000001e, /* 1 to 4 */
 187         0x000001fe, /* 1 to 8 */
 188         0x000001fe, /* 1 to 8 */
 189         0x000001fe, /* 1 to 8 */
 190 };
 191
 192 static const u32 chan222222[] = {
 193         0x00000006, /* 1 to 2 */
 194         0x00000006, /* 1 to 2 */
 195         0x00000006, /* 1 to 2 */
 196         0x00000006, /* 1 to 2 */
 197         0x00000006, /* 1 to 2 */
 198         0x00000006, /* 1 to 2 */
 199 };
 200
 201 static void rsnd_src_set_convert_rate(struct rsnd_dai_stream *io,
 202                                       struct rsnd_mod *mod)
 203 {
 204         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 205         struct device *dev = rsnd_priv_to_dev(priv);
 206         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 207         int is_play = rsnd_io_is_play(io);
 208         int use_src = 0;
 209         u32 fin, fout;
 210         u32 ifscr, fsrate, adinr;
 211         u32 cr, route;
 212         u32 i_busif, o_busif, tmp;
 213         const u32 *bsdsr_table;
 214         const u32 *chptn;
 215         uint ratio;
 216         int chan;
 217         int idx;
 218
 219         if (!runtime)
 220                 return;
 221
 222         fin  = rsnd_src_get_in_rate(priv, io);
 223         fout = rsnd_src_get_out_rate(priv, io);
 224
 225         chan = rsnd_runtime_channel_original(io);
 226
 227         /* 6 - 1/6 are very enough ratio for SRC_BSDSR */
 228         if (fin == fout)
 229                 ratio = 0;
 230         else if (fin > fout)
 231                 ratio = 100 * fin / fout;
 232         else
 233                 ratio = 100 * fout / fin;
 234
 235         if (ratio > 600) {
 236                 dev_err(dev, "FSO/FSI ratio error\n");
 237                 return;
 238         }
 239
 240         use_src = (fin != fout) | rsnd_src_sync_is_enabled(mod);
 241
 242         /*
 243          * SRC_ADINR
 244          */
 245         adinr = rsnd_get_adinr_bit(mod, io) | chan;
 246
 247         /*
 248          * SRC_IFSCR / SRC_IFSVR
 249          */
 250         ifscr = 0;
 251         fsrate = 0;
 252         if (use_src) {
 253                 u64 n;
 254
 255                 ifscr = 1;
 256                 n = (u64)0x0400000 * fin;
 257                 do_div(n, fout);
 258                 fsrate = n;
 259         }
 260
 261         /*
 262          * SRC_SRCCR / SRC_ROUTE_MODE0
 263          */
 264         cr      = 0x00011110;
 265         route   = 0x0;
 266         if (use_src) {
 267                 route   = 0x1;
 268
 269                 if (rsnd_src_sync_is_enabled(mod)) {
 270                         cr |= 0x1;
 271                         route |= rsnd_io_is_play(io) ?
 272                                 (0x1 << 24) : (0x1 << 25);
 273                 }
 274         }
 275
 276         /*
 277          * SRC_BSDSR / SRC_BSISR
 278          *
 279          * see
 280          *      Combination of Register Setting Related to
 281          *      FSO/FSI Ratio and Channel, Latency
 282          */
 283         switch (rsnd_mod_id(mod)) {
 284         case 0:
 285                 chptn           = chan288888;
 286                 bsdsr_table     = bsdsr_table_pattern1;
 287                 break;
 288         case 1:
 289         case 3:
 290         case 4:
 291                 chptn           = chan244888;
 292                 bsdsr_table     = bsdsr_table_pattern1;
 293                 break;
 294         case 2:
 295         case 9:
 296                 chptn           = chan222222;
 297                 bsdsr_table     = bsdsr_table_pattern1;
 298                 break;
 299         case 5:
 300         case 6:
 301         case 7:
 302         case 8:
 303                 chptn           = chan222222;
 304                 bsdsr_table     = bsdsr_table_pattern2;
 305                 break;
 306         default:
 307                 goto convert_rate_err;
 308         }
 309
 310         /*
 311          * E3 need to overwrite
 312          */
 313         if (rsnd_is_e3(priv))
 314                 switch (rsnd_mod_id(mod)) {
 315                 case 0:
 316                 case 4:
 317                         chptn   = chan222222;
 318                 }
 319
 320         for (idx = 0; idx < ARRAY_SIZE(chan222222); idx++)
 321                 if (chptn[idx] & (1 << chan))
 322                         break;
 323
 324         if (chan > 8 ||
 325             idx >= ARRAY_SIZE(chan222222))
 326                 goto convert_rate_err;
 327
 328         /* BUSIF_MODE */
 329         tmp = rsnd_get_busif_shift(io, mod);
 330         i_busif = ( is_play ? tmp : 0) | 1;
 331         o_busif = (!is_play ? tmp : 0) | 1;
 332
 333         rsnd_mod_write(mod, SRC_ROUTE_MODE0, route);
 334
 335         rsnd_mod_write(mod, SRC_SRCIR, 1);      /* initialize */
 336         rsnd_mod_write(mod, SRC_ADINR, adinr);
 337         rsnd_mod_write(mod, SRC_IFSCR, ifscr);
 338         rsnd_mod_write(mod, SRC_IFSVR, fsrate);
 339         rsnd_mod_write(mod, SRC_SRCCR, cr);
 340         rsnd_mod_write(mod, SRC_BSDSR, bsdsr_table[idx]);
 341         rsnd_mod_write(mod, SRC_BSISR, bsisr_table[idx]);
 342         rsnd_mod_write(mod, SRC_SRCIR, 0);      /* cancel initialize */
 343
 344         rsnd_mod_write(mod, SRC_I_BUSIF_MODE, i_busif);
 345         rsnd_mod_write(mod, SRC_O_BUSIF_MODE, o_busif);
 346
 347         rsnd_mod_write(mod, SRC_BUSIF_DALIGN, rsnd_get_dalign(mod, io));
 348
 349         rsnd_adg_set_src_timesel_gen2(mod, io, fin, fout);
 350
 351         return;
 352
 353 convert_rate_err:
 354         dev_err(dev, "unknown BSDSR/BSDIR settings\n");
 355 }
 356
 357 static int rsnd_src_irq(struct rsnd_mod *mod,
 358                         struct rsnd_dai_stream *io,
 359                         struct rsnd_priv *priv,
 360                         int enable)
 361 {
 362         struct rsnd_src *src = rsnd_mod_to_src(mod);
 363         u32 sys_int_val, int_val, sys_int_mask;
 364         int irq = src->irq;
 365         int id = rsnd_mod_id(mod);
 366
 367         sys_int_val =
 368         sys_int_mask = OUF_SRC(id);
 369         int_val = 0x3300;
 370
 371         /*
 372          * IRQ is not supported on non-DT
 373          * see
 374          *      rsnd_src_probe_()
 375          */
 376         if ((irq <= 0) || !enable) {
 377                 sys_int_val = 0;
 378                 int_val = 0;
 379         }
 380
 381         /*
 382          * WORKAROUND
 383          *
 384          * ignore over flow error when rsnd_src_sync_is_enabled()
 385          */
 386         if (rsnd_src_sync_is_enabled(mod))
 387                 sys_int_val = sys_int_val & 0xffff;
 388
 389         rsnd_mod_write(mod, SRC_INT_ENABLE0, int_val);
 390         rsnd_mod_bset(mod, SCU_SYS_INT_EN0, sys_int_mask, sys_int_val);
 391         rsnd_mod_bset(mod, SCU_SYS_INT_EN1, sys_int_mask, sys_int_val);
 392
 393         return 0;
 394 }
 395
 396 static void rsnd_src_status_clear(struct rsnd_mod *mod)
 397 {
 398         u32 val = OUF_SRC(rsnd_mod_id(mod));
 399
 400         rsnd_mod_write(mod, SCU_SYS_STATUS0, val);
 401         rsnd_mod_write(mod, SCU_SYS_STATUS1, val);
 402 }
 403
 404 static bool rsnd_src_error_occurred(struct rsnd_mod *mod)
 405 {
 406         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 407         struct device *dev = rsnd_priv_to_dev(priv);
 408         u32 val0, val1;
 409         u32 status0, status1;
 410         bool ret = false;
 411
 412         val0 = val1 = OUF_SRC(rsnd_mod_id(mod));
 413
 414         /*
 415          * WORKAROUND
 416          *
 417          * ignore over flow error when rsnd_src_sync_is_enabled()
 418          */
 419         if (rsnd_src_sync_is_enabled(mod))
 420                 val0 = val0 & 0xffff;
 421
 422         status0 = rsnd_mod_read(mod, SCU_SYS_STATUS0);
 423         status1 = rsnd_mod_read(mod, SCU_SYS_STATUS1);
 424         if ((status0 & val0) || (status1 & val1)) {
 425                 rsnd_print_irq_status(dev, "%s err status : 0x%08x, 0x%08x\n",
 426                                       rsnd_mod_name(mod), status0, status1);
 427
 428                 ret = true;
 429         }
 430
 431         return ret;
 432 }
 433
 434 static int rsnd_src_start(struct rsnd_mod *mod,
 435                           struct rsnd_dai_stream *io,
 436                           struct rsnd_priv *priv)
 437 {
 438         u32 val;
 439
 440         /*
 441          * WORKAROUND
 442          *
 443          * Enable SRC output if you want to use sync convert together with DVC
 444          */
 445         val = (rsnd_io_to_mod_dvc(io) && !rsnd_src_sync_is_enabled(mod)) ?
 446                 0x01 : 0x11;
 447
 448         rsnd_mod_write(mod, SRC_CTRL, val);
 449
 450         return 0;
 451 }
 452
 453 static int rsnd_src_stop(struct rsnd_mod *mod,
 454                          struct rsnd_dai_stream *io,
 455                          struct rsnd_priv *priv)
 456 {
 457         rsnd_mod_write(mod, SRC_CTRL, 0);
 458
 459         return 0;
 460 }
 461
 462 static int rsnd_src_init(struct rsnd_mod *mod,
 463                          struct rsnd_dai_stream *io,
 464                          struct rsnd_priv *priv)
 465 {
 466         struct rsnd_src *src = rsnd_mod_to_src(mod);
 467         int ret;
 468
 469         /* reset sync convert_rate */
 470         src->sync.val = 0;
 471
 472         ret = rsnd_mod_power_on(mod);
 473         if (ret < 0)
 474                 return ret;
 475
 476         rsnd_src_activation(mod);
 477
 478         rsnd_src_set_convert_rate(io, mod);
 479
 480         rsnd_src_status_clear(mod);
 481
 482         return 0;
 483 }
 484
 485 static int rsnd_src_quit(struct rsnd_mod *mod,
 486                          struct rsnd_dai_stream *io,
 487                          struct rsnd_priv *priv)
 488 {
 489         struct rsnd_src *src = rsnd_mod_to_src(mod);
 490
 491         rsnd_src_halt(mod);
 492
 493         rsnd_mod_power_off(mod);
 494
 495         /* reset sync convert_rate */
 496         src->sync.val = 0;
 497
 498         return 0;
 499 }
 500
 501 static void __rsnd_src_interrupt(struct rsnd_mod *mod,
 502                                  struct rsnd_dai_stream *io)
 503 {
 504         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 505         bool stop = false;
 506
 507         spin_lock(&priv->lock);
 508
 509         /* ignore all cases if not working */
 510         if (!rsnd_io_is_working(io))
 511                 goto rsnd_src_interrupt_out;
 512
 513         if (rsnd_src_error_occurred(mod))
 514                 stop = true;
 515
 516         rsnd_src_status_clear(mod);
 517 rsnd_src_interrupt_out:
 518
 519         spin_unlock(&priv->lock);
 520
 521         if (stop)
 522                 snd_pcm_stop_xrun(io->substream);
 523 }
 524
 525 static irqreturn_t rsnd_src_interrupt(int irq, void *data)
 526 {
 527         struct rsnd_mod *mod = data;
 528
 529         rsnd_mod_interrupt(mod, __rsnd_src_interrupt);
 530
 531         return IRQ_HANDLED;
 532 }
 533
 534 static int rsnd_src_probe_(struct rsnd_mod *mod,
 535                            struct rsnd_dai_stream *io,
 536                            struct rsnd_priv *priv)
 537 {
 538         struct rsnd_src *src = rsnd_mod_to_src(mod);
 539         struct device *dev = rsnd_priv_to_dev(priv);
 540         int irq = src->irq;
 541         int ret;
 542
 543         if (irq > 0) {
 544                 /*
 545                  * IRQ is not supported on non-DT
 546                  * see
 547                  *      rsnd_src_irq()
 548                  */
 549                 ret = devm_request_irq(dev, irq,
 550                                        rsnd_src_interrupt,
 551                                        IRQF_SHARED,
 552                                        dev_name(dev), mod);
 553                 if (ret)
 554                         return ret;
 555         }
 556
 557         ret = rsnd_dma_attach(io, mod, &src->dma);
 558
 559         return ret;
 560 }
 561
 562 static int rsnd_src_pcm_new(struct rsnd_mod *mod,
 563                             struct rsnd_dai_stream *io,
 564                             struct snd_soc_pcm_runtime *rtd)
 565 {
 566         struct rsnd_src *src = rsnd_mod_to_src(mod);
 567         int ret;
 568
 569         /*
 570          * enable SRC sync convert if possible
 571          */
 572
 573         /*
 574          * It can't use SRC Synchronous convert
 575          * when Capture if it uses CMD
 576          */
 577         if (rsnd_io_to_mod_cmd(io) && !rsnd_io_is_play(io))
 578                 return 0;
 579
 580         /*
 581          * enable sync convert
 582          */
 583         ret = rsnd_kctrl_new_s(mod, io, rtd,
 584                                rsnd_io_is_play(io) ?
 585                                "SRC Out Rate Switch" :
 586                                "SRC In Rate Switch",
 587                                rsnd_kctrl_accept_anytime,
 588                                rsnd_src_set_convert_rate,
 589                                &src->sen, 1);
 590         if (ret < 0)
 591                 return ret;
 592
 593         ret = rsnd_kctrl_new_s(mod, io, rtd,
 594                                rsnd_io_is_play(io) ?
 595                                "SRC Out Rate" :
 596                                "SRC In Rate",
 597                                rsnd_kctrl_accept_runtime,
 598                                rsnd_src_set_convert_rate,
 599                                &src->sync, 192000);
 600
 601         return ret;
 602 }
 603
 604 #ifdef CONFIG_DEBUG_FS
 605 static void rsnd_src_debug_info(struct seq_file *m,
 606                                 struct rsnd_dai_stream *io,
 607                                 struct rsnd_mod *mod)
 608 {
 609         rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SCU,
 610                                   rsnd_mod_id(mod) * 0x20, 0x20);
 611         seq_puts(m, "\n");
 612         rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SCU,
 613                                   0x1c0, 0x20);
 614         seq_puts(m, "\n");
 615         rsnd_debugfs_mod_reg_show(m, mod, RSND_GEN2_SCU,
 616                                   0x200 + rsnd_mod_id(mod) * 0x40, 0x40);
 617 }
 618 #define DEBUG_INFO .debug_info = rsnd_src_debug_info
 619 #else
 620 #define DEBUG_INFO
 621 #endif
 622
 623 static struct rsnd_mod_ops rsnd_src_ops = {
 624         .name           = SRC_NAME,
 625         .dma_req        = rsnd_src_dma_req,
 626         .probe          = rsnd_src_probe_,
 627         .init           = rsnd_src_init,
 628         .quit           = rsnd_src_quit,
 629         .start          = rsnd_src_start,
 630         .stop           = rsnd_src_stop,
 631         .irq            = rsnd_src_irq,
 632         .pcm_new        = rsnd_src_pcm_new,
 633         .get_status     = rsnd_mod_get_status,
 634         DEBUG_INFO
 635 };
 636
 637 struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id)
 638 {
 639         if (WARN_ON(id < 0 || id >= rsnd_src_nr(priv)))
 640                 id = 0;
 641
 642         return rsnd_mod_get(rsnd_src_get(priv, id));
 643 }
 644
 645 int rsnd_src_probe(struct rsnd_priv *priv)
 646 {
 647         struct device_node *node;
 648         struct device_node *np;
 649         struct device *dev = rsnd_priv_to_dev(priv);
 650         struct rsnd_src *src;
 651         struct clk *clk;
 652         char name[RSND_SRC_NAME_SIZE];
 653         int i, nr, ret;
 654
 655         /* This driver doesn't support Gen1 at this point */
 656         if (rsnd_is_gen1(priv))
 657                 return 0;
 658
 659         node = rsnd_src_of_node(priv);
 660         if (!node)
 661                 return 0; /* not used is not error */
 662
 663         nr = rsnd_node_count(priv, node, SRC_NAME);
 664         if (!nr) {
 665                 ret = -EINVAL;
 666                 goto rsnd_src_probe_done;
 667         }
 668
 669         src     = devm_kcalloc(dev, nr, sizeof(*src), GFP_KERNEL);
 670         if (!src) {
 671                 ret = -ENOMEM;
 672                 goto rsnd_src_probe_done;
 673         }
 674
 675         priv->src_nr    = nr;
 676         priv->src       = src;
 677
 678         i = 0;
 679         for_each_child_of_node(node, np) {
 680                 if (!of_device_is_available(np))
 681                         goto skip;
 682
 683                 i = rsnd_node_fixed_index(dev, np, SRC_NAME, i);
 684                 if (i < 0) {
 685                         ret = -EINVAL;
 686                         of_node_put(np);
 687                         goto rsnd_src_probe_done;
 688                 }
 689
 690                 src = rsnd_src_get(priv, i);
 691
 692                 snprintf(name, RSND_SRC_NAME_SIZE, "%s.%d",
 693                          SRC_NAME, i);
 694
 695                 src->irq = irq_of_parse_and_map(np, 0);
 696                 if (!src->irq) {
 697                         ret = -EINVAL;
 698                         of_node_put(np);
 699                         goto rsnd_src_probe_done;
 700                 }
 701
 702                 clk = devm_clk_get(dev, name);
 703                 if (IS_ERR(clk)) {
 704                         ret = PTR_ERR(clk);
 705                         of_node_put(np);
 706                         goto rsnd_src_probe_done;
 707                 }
 708
 709                 ret = rsnd_mod_init(priv, rsnd_mod_get(src),
 710                                     &rsnd_src_ops, clk, RSND_MOD_SRC, i);
 711                 if (ret) {
 712                         of_node_put(np);
 713                         goto rsnd_src_probe_done;
 714                 }
 715
 716 skip:
 717                 i++;
 718         }
 719
 720         ret = 0;
 721
 722 rsnd_src_probe_done:
 723         of_node_put(node);
 724
 725         return ret;
 726 }
 727
 728 void rsnd_src_remove(struct rsnd_priv *priv)
 729 {
 730         struct rsnd_src *src;
 731         int i;
 732
 733         for_each_rsnd_src(src, priv, i) {
 734                 rsnd_mod_quit(rsnd_mod_get(src));
 735         }
 736 }