kernel/sound/soc/jz4740/jz4740-i2s.c

   1 /*
   2  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
   3  *
   4  *  This program is free software; you can redistribute it and/or modify it
   5  *  under  the terms of the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the License, or (at your
   7  *  option) any later version.
   8  *
   9  *  You should have received a copy of the GNU General Public License along
  10  *  with this program; if not, write to the Free Software Foundation, Inc.,
  11  *  675 Mass Ave, Cambridge, MA 02139, USA.
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/io.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23
  24 #include <linux/clk.h>
  25 #include <linux/delay.h>
  26
  27 #include <linux/dma-mapping.h>
  28
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/soc.h>
  33 #include <sound/initval.h>
  34 #include <sound/dmaengine_pcm.h>
  35
  36 #include "jz4740-i2s.h"
  37
  38 #define JZ4740_DMA_TYPE_AIC_TRANSMIT 24
  39 #define JZ4740_DMA_TYPE_AIC_RECEIVE 25
  40
  41 #define JZ_REG_AIC_CONF         0x00
  42 #define JZ_REG_AIC_CTRL         0x04
  43 #define JZ_REG_AIC_I2S_FMT      0x10
  44 #define JZ_REG_AIC_FIFO_STATUS  0x14
  45 #define JZ_REG_AIC_I2S_STATUS   0x1c
  46 #define JZ_REG_AIC_CLK_DIV      0x30
  47 #define JZ_REG_AIC_FIFO         0x34
  48
  49 #define JZ_AIC_CONF_FIFO_RX_THRESHOLD_MASK (0xf << 12)
  50 #define JZ_AIC_CONF_FIFO_TX_THRESHOLD_MASK (0xf <<  8)
  51 #define JZ_AIC_CONF_OVERFLOW_PLAY_LAST BIT(6)
  52 #define JZ_AIC_CONF_INTERNAL_CODEC BIT(5)
  53 #define JZ_AIC_CONF_I2S BIT(4)
  54 #define JZ_AIC_CONF_RESET BIT(3)
  55 #define JZ_AIC_CONF_BIT_CLK_MASTER BIT(2)
  56 #define JZ_AIC_CONF_SYNC_CLK_MASTER BIT(1)
  57 #define JZ_AIC_CONF_ENABLE BIT(0)
  58
  59 #define JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET 12
  60 #define JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET 8
  61 #define JZ4780_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET 24
  62 #define JZ4780_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET 16
  63 #define JZ4780_AIC_CONF_FIFO_RX_THRESHOLD_MASK \
  64                         (0xf << JZ4780_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET)
  65 #define JZ4780_AIC_CONF_FIFO_TX_THRESHOLD_MASK \
  66                         (0x1f <<  JZ4780_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET)
  67
  68 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK (0x7 << 19)
  69 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK (0x7 << 16)
  70 #define JZ_AIC_CTRL_ENABLE_RX_DMA BIT(15)
  71 #define JZ_AIC_CTRL_ENABLE_TX_DMA BIT(14)
  72 #define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11)
  73 #define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10)
  74 #define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9)
  75 #define JZ_AIC_CTRL_FLUSH               BIT(8)
  76 #define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6)
  77 #define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5)
  78 #define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4)
  79 #define JZ_AIC_CTRL_ENABLE_TFS_INT BIT(3)
  80 #define JZ_AIC_CTRL_ENABLE_LOOPBACK BIT(2)
  81 #define JZ_AIC_CTRL_ENABLE_PLAYBACK BIT(1)
  82 #define JZ_AIC_CTRL_ENABLE_CAPTURE BIT(0)
  83
  84 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET 19
  85 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET  16
  86
  87 #define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK BIT(12)
  88 #define JZ_AIC_I2S_FMT_DISABLE_BIT_ICLK BIT(13)
  89 #define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK BIT(4)
  90 #define JZ_AIC_I2S_FMT_MSB BIT(0)
  91
  92 #define JZ_AIC_I2S_STATUS_BUSY BIT(2)
  93
  94 #define JZ_AIC_CLK_DIV_MASK 0xf
  95 #define I2SDIV_DV_SHIFT 8
  96 #define I2SDIV_DV_MASK (0xf << I2SDIV_DV_SHIFT)
  97 #define I2SDIV_IDV_SHIFT 8
  98 #define I2SDIV_IDV_MASK (0xf << I2SDIV_IDV_SHIFT)
  99
 100 enum jz47xx_i2s_version {
 101         JZ_I2S_JZ4740,
 102         JZ_I2S_JZ4780,
 103 };
 104
 105 struct jz4740_i2s {
 106         struct resource *mem;
 107         void __iomem *base;
 108         dma_addr_t phys_base;
 109
 110         struct clk *clk_aic;
 111         struct clk *clk_i2s;
 112
 113         struct snd_dmaengine_dai_dma_data playback_dma_data;
 114         struct snd_dmaengine_dai_dma_data capture_dma_data;
 115
 116         enum jz47xx_i2s_version version;
 117 };
 118
 119 static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s,
 120         unsigned int reg)
 121 {
 122         return readl(i2s->base + reg);
 123 }
 124
 125 static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s,
 126         unsigned int reg, uint32_t value)
 127 {
 128         writel(value, i2s->base + reg);
 129 }
 130
 131 static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
 132         struct snd_soc_dai *dai)
 133 {
 134         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 135         uint32_t conf, ctrl;
 136
 137         if (dai->active)
 138                 return 0;
 139
 140         ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 141         ctrl |= JZ_AIC_CTRL_FLUSH;
 142         jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
 143
 144         clk_prepare_enable(i2s->clk_i2s);
 145
 146         conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 147         conf |= JZ_AIC_CONF_ENABLE;
 148         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 149
 150         return 0;
 151 }
 152
 153 static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
 154         struct snd_soc_dai *dai)
 155 {
 156         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 157         uint32_t conf;
 158
 159         if (dai->active)
 160                 return;
 161
 162         conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 163         conf &= ~JZ_AIC_CONF_ENABLE;
 164         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 165
 166         clk_disable_unprepare(i2s->clk_i2s);
 167 }
 168
 169 static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 170         struct snd_soc_dai *dai)
 171 {
 172         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 173
 174         uint32_t ctrl;
 175         uint32_t mask;
 176
 177         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 178                 mask = JZ_AIC_CTRL_ENABLE_PLAYBACK | JZ_AIC_CTRL_ENABLE_TX_DMA;
 179         else
 180                 mask = JZ_AIC_CTRL_ENABLE_CAPTURE | JZ_AIC_CTRL_ENABLE_RX_DMA;
 181
 182         ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 183
 184         switch (cmd) {
 185         case SNDRV_PCM_TRIGGER_START:
 186         case SNDRV_PCM_TRIGGER_RESUME:
 187         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 188                 ctrl |= mask;
 189                 break;
 190         case SNDRV_PCM_TRIGGER_STOP:
 191         case SNDRV_PCM_TRIGGER_SUSPEND:
 192         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 193                 ctrl &= ~mask;
 194                 break;
 195         default:
 196                 return -EINVAL;
 197         }
 198
 199         jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
 200
 201         return 0;
 202 }
 203
 204 static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 205 {
 206         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 207
 208         uint32_t format = 0;
 209         uint32_t conf;
 210
 211         conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 212
 213         conf &= ~(JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER);
 214
 215         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 216         case SND_SOC_DAIFMT_CBS_CFS:
 217                 conf |= JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER;
 218                 format |= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
 219                 break;
 220         case SND_SOC_DAIFMT_CBM_CFS:
 221                 conf |= JZ_AIC_CONF_SYNC_CLK_MASTER;
 222                 break;
 223         case SND_SOC_DAIFMT_CBS_CFM:
 224                 conf |= JZ_AIC_CONF_BIT_CLK_MASTER;
 225                 break;
 226         case SND_SOC_DAIFMT_CBM_CFM:
 227                 break;
 228         default:
 229                 return -EINVAL;
 230         }
 231
 232         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 233         case SND_SOC_DAIFMT_MSB:
 234                 format |= JZ_AIC_I2S_FMT_MSB;
 235                 break;
 236         case SND_SOC_DAIFMT_I2S:
 237                 break;
 238         default:
 239                 return -EINVAL;
 240         }
 241
 242         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 243         case SND_SOC_DAIFMT_NB_NF:
 244                 break;
 245         default:
 246                 return -EINVAL;
 247         }
 248
 249         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 250         jz4740_i2s_write(i2s, JZ_REG_AIC_I2S_FMT, format);
 251
 252         return 0;
 253 }
 254
 255 static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
 256         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 257 {
 258         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 259         unsigned int sample_size;
 260         uint32_t ctrl, div_reg;
 261         int div;
 262
 263         ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 264
 265         div_reg = jz4740_i2s_read(i2s, JZ_REG_AIC_CLK_DIV);
 266         div = clk_get_rate(i2s->clk_i2s) / (64 * params_rate(params));
 267
 268         switch (params_format(params)) {
 269         case SNDRV_PCM_FORMAT_S8:
 270                 sample_size = 0;
 271                 break;
 272         case SNDRV_PCM_FORMAT_S16:
 273                 sample_size = 1;
 274                 break;
 275         default:
 276                 return -EINVAL;
 277         }
 278
 279         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 280                 ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK;
 281                 ctrl |= sample_size << JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET;
 282                 if (params_channels(params) == 1)
 283                         ctrl |= JZ_AIC_CTRL_MONO_TO_STEREO;
 284                 else
 285                         ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;
 286
 287                 div_reg &= ~I2SDIV_DV_MASK;
 288                 div_reg |= (div - 1) << I2SDIV_DV_SHIFT;
 289         } else {
 290                 ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK;
 291                 ctrl |= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET;
 292
 293                 if (i2s->version >= JZ_I2S_JZ4780) {
 294                         div_reg &= ~I2SDIV_IDV_MASK;
 295                         div_reg |= (div - 1) << I2SDIV_IDV_SHIFT;
 296                 } else {
 297                         div_reg &= ~I2SDIV_DV_MASK;
 298                         div_reg |= (div - 1) << I2SDIV_DV_SHIFT;
 299                 }
 300         }
 301
 302         jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);
 303         jz4740_i2s_write(i2s, JZ_REG_AIC_CLK_DIV, div_reg);
 304
 305         return 0;
 306 }
 307
 308 static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 309         unsigned int freq, int dir)
 310 {
 311         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 312         struct clk *parent;
 313         int ret = 0;
 314
 315         switch (clk_id) {
 316         case JZ4740_I2S_CLKSRC_EXT:
 317                 parent = clk_get(NULL, "ext");
 318                 clk_set_parent(i2s->clk_i2s, parent);
 319                 break;
 320         case JZ4740_I2S_CLKSRC_PLL:
 321                 parent = clk_get(NULL, "pll half");
 322                 clk_set_parent(i2s->clk_i2s, parent);
 323                 ret = clk_set_rate(i2s->clk_i2s, freq);
 324                 break;
 325         default:
 326                 return -EINVAL;
 327         }
 328         clk_put(parent);
 329
 330         return ret;
 331 }
 332
 333 static int jz4740_i2s_suspend(struct snd_soc_dai *dai)
 334 {
 335         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 336         uint32_t conf;
 337
 338         if (dai->active) {
 339                 conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 340                 conf &= ~JZ_AIC_CONF_ENABLE;
 341                 jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 342
 343                 clk_disable_unprepare(i2s->clk_i2s);
 344         }
 345
 346         clk_disable_unprepare(i2s->clk_aic);
 347
 348         return 0;
 349 }
 350
 351 static int jz4740_i2s_resume(struct snd_soc_dai *dai)
 352 {
 353         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 354         uint32_t conf;
 355
 356         clk_prepare_enable(i2s->clk_aic);
 357
 358         if (dai->active) {
 359                 clk_prepare_enable(i2s->clk_i2s);
 360
 361                 conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 362                 conf |= JZ_AIC_CONF_ENABLE;
 363                 jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 364         }
 365
 366         return 0;
 367 }
 368
 369 static void jz4740_i2c_init_pcm_config(struct jz4740_i2s *i2s)
 370 {
 371         struct snd_dmaengine_dai_dma_data *dma_data;
 372
 373         /* Playback */
 374         dma_data = &i2s->playback_dma_data;
 375         dma_data->maxburst = 16;
 376         dma_data->slave_id = JZ4740_DMA_TYPE_AIC_TRANSMIT;
 377         dma_data->addr = i2s->phys_base + JZ_REG_AIC_FIFO;
 378
 379         /* Capture */
 380         dma_data = &i2s->capture_dma_data;
 381         dma_data->maxburst = 16;
 382         dma_data->slave_id = JZ4740_DMA_TYPE_AIC_RECEIVE;
 383         dma_data->addr = i2s->phys_base + JZ_REG_AIC_FIFO;
 384 }
 385
 386 static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
 387 {
 388         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 389         uint32_t conf;
 390
 391         clk_prepare_enable(i2s->clk_aic);
 392
 393         jz4740_i2c_init_pcm_config(i2s);
 394         snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
 395                 &i2s->capture_dma_data);
 396
 397         if (i2s->version >= JZ_I2S_JZ4780) {
 398                 conf = (7 << JZ4780_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
 399                         (8 << JZ4780_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
 400                         JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
 401                         JZ_AIC_CONF_I2S |
 402                         JZ_AIC_CONF_INTERNAL_CODEC;
 403         } else {
 404                 conf = (7 << JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
 405                         (8 << JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
 406                         JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
 407                         JZ_AIC_CONF_I2S |
 408                         JZ_AIC_CONF_INTERNAL_CODEC;
 409         }
 410
 411         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
 412         jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 413
 414         return 0;
 415 }
 416
 417 static int jz4740_i2s_dai_remove(struct snd_soc_dai *dai)
 418 {
 419         struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 420
 421         clk_disable_unprepare(i2s->clk_aic);
 422         return 0;
 423 }
 424
 425 static const struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
 426         .startup = jz4740_i2s_startup,
 427         .shutdown = jz4740_i2s_shutdown,
 428         .trigger = jz4740_i2s_trigger,
 429         .hw_params = jz4740_i2s_hw_params,
 430         .set_fmt = jz4740_i2s_set_fmt,
 431         .set_sysclk = jz4740_i2s_set_sysclk,
 432 };
 433
 434 #define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
 435                 SNDRV_PCM_FMTBIT_S16_LE)
 436
 437 static struct snd_soc_dai_driver jz4740_i2s_dai = {
 438         .probe = jz4740_i2s_dai_probe,
 439         .remove = jz4740_i2s_dai_remove,
 440         .playback = {
 441                 .channels_min = 1,
 442                 .channels_max = 2,
 443                 .rates = SNDRV_PCM_RATE_8000_48000,
 444                 .formats = JZ4740_I2S_FMTS,
 445         },
 446         .capture = {
 447                 .channels_min = 2,
 448                 .channels_max = 2,
 449                 .rates = SNDRV_PCM_RATE_8000_48000,
 450                 .formats = JZ4740_I2S_FMTS,
 451         },
 452         .symmetric_rates = 1,
 453         .ops = &jz4740_i2s_dai_ops,
 454         .suspend = jz4740_i2s_suspend,
 455         .resume = jz4740_i2s_resume,
 456 };
 457
 458 static struct snd_soc_dai_driver jz4780_i2s_dai = {
 459         .probe = jz4740_i2s_dai_probe,
 460         .remove = jz4740_i2s_dai_remove,
 461         .playback = {
 462                 .channels_min = 1,
 463                 .channels_max = 2,
 464                 .rates = SNDRV_PCM_RATE_8000_48000,
 465                 .formats = JZ4740_I2S_FMTS,
 466         },
 467         .capture = {
 468                 .channels_min = 2,
 469                 .channels_max = 2,
 470                 .rates = SNDRV_PCM_RATE_8000_48000,
 471                 .formats = JZ4740_I2S_FMTS,
 472         },
 473         .ops = &jz4740_i2s_dai_ops,
 474         .suspend = jz4740_i2s_suspend,
 475         .resume = jz4740_i2s_resume,
 476 };
 477
 478 static const struct snd_soc_component_driver jz4740_i2s_component = {
 479         .name           = "jz4740-i2s",
 480 };
 481
 482 #ifdef CONFIG_OF
 483 static const struct of_device_id jz4740_of_matches[] = {
 484         { .compatible = "ingenic,jz4740-i2s", .data = (void *)JZ_I2S_JZ4740 },
 485         { .compatible = "ingenic,jz4780-i2s", .data = (void *)JZ_I2S_JZ4780 },
 486         { /* sentinel */ }
 487 };
 488 #endif
 489
 490 static int jz4740_i2s_dev_probe(struct platform_device *pdev)
 491 {
 492         struct jz4740_i2s *i2s;
 493         struct resource *mem;
 494         int ret;
 495         const struct of_device_id *match;
 496
 497         i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
 498         if (!i2s)
 499                 return -ENOMEM;
 500
 501         match = of_match_device(jz4740_of_matches, &pdev->dev);
 502         if (match)
 503                 i2s->version = (enum jz47xx_i2s_version)match->data;
 504
 505         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 506         i2s->base = devm_ioremap_resource(&pdev->dev, mem);
 507         if (IS_ERR(i2s->base))
 508                 return PTR_ERR(i2s->base);
 509
 510         i2s->phys_base = mem->start;
 511
 512         i2s->clk_aic = devm_clk_get(&pdev->dev, "aic");
 513         if (IS_ERR(i2s->clk_aic))
 514                 return PTR_ERR(i2s->clk_aic);
 515
 516         i2s->clk_i2s = devm_clk_get(&pdev->dev, "i2s");
 517         if (IS_ERR(i2s->clk_i2s))
 518                 return PTR_ERR(i2s->clk_i2s);
 519
 520         platform_set_drvdata(pdev, i2s);
 521
 522         if (i2s->version == JZ_I2S_JZ4780)
 523                 ret = devm_snd_soc_register_component(&pdev->dev,
 524                         &jz4740_i2s_component, &jz4780_i2s_dai, 1);
 525         else
 526                 ret = devm_snd_soc_register_component(&pdev->dev,
 527                         &jz4740_i2s_component, &jz4740_i2s_dai, 1);
 528
 529         if (ret)
 530                 return ret;
 531
 532         return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
 533                 SND_DMAENGINE_PCM_FLAG_COMPAT);
 534 }
 535
 536 static struct platform_driver jz4740_i2s_driver = {
 537         .probe = jz4740_i2s_dev_probe,
 538         .driver = {
 539                 .name = "jz4740-i2s",
 540                 .of_match_table = of_match_ptr(jz4740_of_matches)
 541         },
 542 };
 543
 544 module_platform_driver(jz4740_i2s_driver);
 545
 546 MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
 547 MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
 548 MODULE_LICENSE("GPL");
 549 MODULE_ALIAS("platform:jz4740-i2s");