sound/soc/tegra/tegra30_i2s.c

   1 /*
   2  * tegra30_i2s.c - Tegra30 I2S driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (c) 2010-2012, NVIDIA CORPORATION.  All rights reserved.
   6  *
   7  * Based on code copyright/by:
   8  *
   9  * Copyright (c) 2009-2010, NVIDIA Corporation.
  10  * Scott Peterson <speterson@nvidia.com>
  11  *
  12  * Copyright (C) 2010 Google, Inc.
  13  * Iliyan Malchev <malchev@google.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms and conditions of the GNU General Public License,
  17  * version 2, as published by the Free Software Foundation.
  18  *
  19  * This program is distributed in the hope it will be useful, but WITHOUT
  20  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  21  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  22  * more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 #include <linux/clk.h>
  29 #include <linux/device.h>
  30 #include <linux/io.h>
  31 #include <linux/module.h>
  32 #include <linux/of.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/pm_runtime.h>
  35 #include <linux/regmap.h>
  36 #include <linux/slab.h>
  37 #include <sound/core.h>
  38 #include <sound/pcm.h>
  39 #include <sound/pcm_params.h>
  40 #include <sound/soc.h>
  41 #include <sound/dmaengine_pcm.h>
  42
  43 #include "tegra30_ahub.h"
  44 #include "tegra30_i2s.h"
  45
  46 #define DRV_NAME "tegra30-i2s"
  47
  48 static int tegra30_i2s_runtime_suspend(struct device *dev)
  49 {
  50         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  51
  52         regcache_cache_only(i2s->regmap, true);
  53
  54         clk_disable_unprepare(i2s->clk_i2s);
  55
  56         return 0;
  57 }
  58
  59 static int tegra30_i2s_runtime_resume(struct device *dev)
  60 {
  61         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
  62         int ret;
  63
  64         ret = clk_prepare_enable(i2s->clk_i2s);
  65         if (ret) {
  66                 dev_err(dev, "clk_enable failed: %d\n", ret);
  67                 return ret;
  68         }
  69
  70         regcache_cache_only(i2s->regmap, false);
  71
  72         return 0;
  73 }
  74
  75 static int tegra30_i2s_startup(struct snd_pcm_substream *substream,
  76                         struct snd_soc_dai *dai)
  77 {
  78         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
  79         int ret;
  80
  81         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  82                 ret = tegra30_ahub_allocate_tx_fifo(&i2s->playback_fifo_cif,
  83                                         &i2s->playback_dma_data.addr,
  84                                         &i2s->playback_dma_data.slave_id);
  85                 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  86                 i2s->playback_dma_data.maxburst = 4;
  87                 tegra30_ahub_set_rx_cif_source(i2s->playback_i2s_cif,
  88                                                i2s->playback_fifo_cif);
  89         } else {
  90                 ret = tegra30_ahub_allocate_rx_fifo(&i2s->capture_fifo_cif,
  91                                         &i2s->capture_dma_data.addr,
  92                                         &i2s->capture_dma_data.slave_id);
  93                 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
  94                 i2s->capture_dma_data.maxburst = 4;
  95                 tegra30_ahub_set_rx_cif_source(i2s->capture_fifo_cif,
  96                                                i2s->capture_i2s_cif);
  97         }
  98
  99         return ret;
 100 }
 101
 102 static void tegra30_i2s_shutdown(struct snd_pcm_substream *substream,
 103                         struct snd_soc_dai *dai)
 104 {
 105         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 106
 107         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 108                 tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif);
 109                 tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif);
 110         } else {
 111                 tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif);
 112                 tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif);
 113         }
 114 }
 115
 116 static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai,
 117                                 unsigned int fmt)
 118 {
 119         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 120         unsigned int mask, val;
 121
 122         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 123         case SND_SOC_DAIFMT_NB_NF:
 124                 break;
 125         default:
 126                 return -EINVAL;
 127         }
 128
 129         mask = TEGRA30_I2S_CTRL_MASTER_ENABLE;
 130         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 131         case SND_SOC_DAIFMT_CBS_CFS:
 132                 val = TEGRA30_I2S_CTRL_MASTER_ENABLE;
 133                 break;
 134         case SND_SOC_DAIFMT_CBM_CFM:
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         mask |= TEGRA30_I2S_CTRL_FRAME_FORMAT_MASK |
 141                 TEGRA30_I2S_CTRL_LRCK_MASK;
 142         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 143         case SND_SOC_DAIFMT_DSP_A:
 144                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
 145                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 146                 break;
 147         case SND_SOC_DAIFMT_DSP_B:
 148                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC;
 149                 val |= TEGRA30_I2S_CTRL_LRCK_R_LOW;
 150                 break;
 151         case SND_SOC_DAIFMT_I2S:
 152                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 153                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 154                 break;
 155         case SND_SOC_DAIFMT_RIGHT_J:
 156                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 157                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 158                 break;
 159         case SND_SOC_DAIFMT_LEFT_J:
 160                 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK;
 161                 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW;
 162                 break;
 163         default:
 164                 return -EINVAL;
 165         }
 166
 167         pm_runtime_get_sync(dai->dev);
 168         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 169         pm_runtime_put(dai->dev);
 170
 171         return 0;
 172 }
 173
 174 static int tegra30_i2s_hw_params(struct snd_pcm_substream *substream,
 175                                  struct snd_pcm_hw_params *params,
 176                                  struct snd_soc_dai *dai)
 177 {
 178         struct device *dev = dai->dev;
 179         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 180         unsigned int mask, val, reg;
 181         int ret, sample_size, srate, i2sclock, bitcnt;
 182
 183         if (params_channels(params) != 2)
 184                 return -EINVAL;
 185
 186         mask = TEGRA30_I2S_CTRL_BIT_SIZE_MASK;
 187         switch (params_format(params)) {
 188         case SNDRV_PCM_FORMAT_S16_LE:
 189                 val = TEGRA30_I2S_CTRL_BIT_SIZE_16;
 190                 sample_size = 16;
 191                 break;
 192         default:
 193                 return -EINVAL;
 194         }
 195
 196         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val);
 197
 198         srate = params_rate(params);
 199
 200         /* Final "* 2" required by Tegra hardware */
 201         i2sclock = srate * params_channels(params) * sample_size * 2;
 202
 203         bitcnt = (i2sclock / (2 * srate)) - 1;
 204         if (bitcnt < 0 || bitcnt > TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
 205                 return -EINVAL;
 206
 207         ret = clk_set_rate(i2s->clk_i2s, i2sclock);
 208         if (ret) {
 209                 dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
 210                 return ret;
 211         }
 212
 213         val = bitcnt << TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
 214
 215         if (i2sclock % (2 * srate))
 216                 val |= TEGRA30_I2S_TIMING_NON_SYM_ENABLE;
 217
 218         regmap_write(i2s->regmap, TEGRA30_I2S_TIMING, val);
 219
 220         val = (0 << TEGRA30_AUDIOCIF_CTRL_FIFO_THRESHOLD_SHIFT) |
 221               (1 << TEGRA30_AUDIOCIF_CTRL_AUDIO_CHANNELS_SHIFT) |
 222               (1 << TEGRA30_AUDIOCIF_CTRL_CLIENT_CHANNELS_SHIFT) |
 223               TEGRA30_AUDIOCIF_CTRL_AUDIO_BITS_16 |
 224               TEGRA30_AUDIOCIF_CTRL_CLIENT_BITS_16;
 225
 226         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 227                 val |= TEGRA30_AUDIOCIF_CTRL_DIRECTION_RX;
 228                 reg = TEGRA30_I2S_CIF_RX_CTRL;
 229         } else {
 230                 val |= TEGRA30_AUDIOCIF_CTRL_DIRECTION_TX;
 231                 reg = TEGRA30_I2S_CIF_TX_CTRL;
 232         }
 233
 234         regmap_write(i2s->regmap, reg, val);
 235
 236         val = (1 << TEGRA30_I2S_OFFSET_RX_DATA_OFFSET_SHIFT) |
 237               (1 << TEGRA30_I2S_OFFSET_TX_DATA_OFFSET_SHIFT);
 238         regmap_write(i2s->regmap, TEGRA30_I2S_OFFSET, val);
 239
 240         return 0;
 241 }
 242
 243 static void tegra30_i2s_start_playback(struct tegra30_i2s *i2s)
 244 {
 245         tegra30_ahub_enable_tx_fifo(i2s->playback_fifo_cif);
 246         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 247                            TEGRA30_I2S_CTRL_XFER_EN_TX,
 248                            TEGRA30_I2S_CTRL_XFER_EN_TX);
 249 }
 250
 251 static void tegra30_i2s_stop_playback(struct tegra30_i2s *i2s)
 252 {
 253         tegra30_ahub_disable_tx_fifo(i2s->playback_fifo_cif);
 254         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 255                            TEGRA30_I2S_CTRL_XFER_EN_TX, 0);
 256 }
 257
 258 static void tegra30_i2s_start_capture(struct tegra30_i2s *i2s)
 259 {
 260         tegra30_ahub_enable_rx_fifo(i2s->capture_fifo_cif);
 261         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 262                            TEGRA30_I2S_CTRL_XFER_EN_RX,
 263                            TEGRA30_I2S_CTRL_XFER_EN_RX);
 264 }
 265
 266 static void tegra30_i2s_stop_capture(struct tegra30_i2s *i2s)
 267 {
 268         tegra30_ahub_disable_rx_fifo(i2s->capture_fifo_cif);
 269         regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL,
 270                            TEGRA30_I2S_CTRL_XFER_EN_RX, 0);
 271 }
 272
 273 static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 274                                 struct snd_soc_dai *dai)
 275 {
 276         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 277
 278         switch (cmd) {
 279         case SNDRV_PCM_TRIGGER_START:
 280         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 281         case SNDRV_PCM_TRIGGER_RESUME:
 282                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 283                         tegra30_i2s_start_playback(i2s);
 284                 else
 285                         tegra30_i2s_start_capture(i2s);
 286                 break;
 287         case SNDRV_PCM_TRIGGER_STOP:
 288         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 289         case SNDRV_PCM_TRIGGER_SUSPEND:
 290                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 291                         tegra30_i2s_stop_playback(i2s);
 292                 else
 293                         tegra30_i2s_stop_capture(i2s);
 294                 break;
 295         default:
 296                 return -EINVAL;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static int tegra30_i2s_probe(struct snd_soc_dai *dai)
 303 {
 304         struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 305
 306         dai->capture_dma_data = &i2s->capture_dma_data;
 307         dai->playback_dma_data = &i2s->playback_dma_data;
 308
 309         return 0;
 310 }
 311
 312 static struct snd_soc_dai_ops tegra30_i2s_dai_ops = {
 313         .startup        = tegra30_i2s_startup,
 314         .shutdown       = tegra30_i2s_shutdown,
 315         .set_fmt        = tegra30_i2s_set_fmt,
 316         .hw_params      = tegra30_i2s_hw_params,
 317         .trigger        = tegra30_i2s_trigger,
 318 };
 319
 320 static const struct snd_soc_dai_driver tegra30_i2s_dai_template = {
 321         .probe = tegra30_i2s_probe,
 322         .playback = {
 323                 .stream_name = "Playback",
 324                 .channels_min = 2,
 325                 .channels_max = 2,
 326                 .rates = SNDRV_PCM_RATE_8000_96000,
 327                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 328         },
 329         .capture = {
 330                 .stream_name = "Capture",
 331                 .channels_min = 2,
 332                 .channels_max = 2,
 333                 .rates = SNDRV_PCM_RATE_8000_96000,
 334                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 335         },
 336         .ops = &tegra30_i2s_dai_ops,
 337         .symmetric_rates = 1,
 338 };
 339
 340 static const struct snd_soc_component_driver tegra30_i2s_component = {
 341         .name           = DRV_NAME,
 342 };
 343
 344 static bool tegra30_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
 345 {
 346         switch (reg) {
 347         case TEGRA30_I2S_CTRL:
 348         case TEGRA30_I2S_TIMING:
 349         case TEGRA30_I2S_OFFSET:
 350         case TEGRA30_I2S_CH_CTRL:
 351         case TEGRA30_I2S_SLOT_CTRL:
 352         case TEGRA30_I2S_CIF_RX_CTRL:
 353         case TEGRA30_I2S_CIF_TX_CTRL:
 354         case TEGRA30_I2S_FLOWCTL:
 355         case TEGRA30_I2S_TX_STEP:
 356         case TEGRA30_I2S_FLOW_STATUS:
 357         case TEGRA30_I2S_FLOW_TOTAL:
 358         case TEGRA30_I2S_FLOW_OVER:
 359         case TEGRA30_I2S_FLOW_UNDER:
 360         case TEGRA30_I2S_LCOEF_1_4_0:
 361         case TEGRA30_I2S_LCOEF_1_4_1:
 362         case TEGRA30_I2S_LCOEF_1_4_2:
 363         case TEGRA30_I2S_LCOEF_1_4_3:
 364         case TEGRA30_I2S_LCOEF_1_4_4:
 365         case TEGRA30_I2S_LCOEF_1_4_5:
 366         case TEGRA30_I2S_LCOEF_2_4_0:
 367         case TEGRA30_I2S_LCOEF_2_4_1:
 368         case TEGRA30_I2S_LCOEF_2_4_2:
 369                 return true;
 370         default:
 371                 return false;
 372         };
 373 }
 374
 375 static bool tegra30_i2s_volatile_reg(struct device *dev, unsigned int reg)
 376 {
 377         switch (reg) {
 378         case TEGRA30_I2S_FLOW_STATUS:
 379         case TEGRA30_I2S_FLOW_TOTAL:
 380         case TEGRA30_I2S_FLOW_OVER:
 381         case TEGRA30_I2S_FLOW_UNDER:
 382                 return true;
 383         default:
 384                 return false;
 385         };
 386 }
 387
 388 static const struct regmap_config tegra30_i2s_regmap_config = {
 389         .reg_bits = 32,
 390         .reg_stride = 4,
 391         .val_bits = 32,
 392         .max_register = TEGRA30_I2S_LCOEF_2_4_2,
 393         .writeable_reg = tegra30_i2s_wr_rd_reg,
 394         .readable_reg = tegra30_i2s_wr_rd_reg,
 395         .volatile_reg = tegra30_i2s_volatile_reg,
 396         .cache_type = REGCACHE_RBTREE,
 397 };
 398
 399 static int tegra30_i2s_platform_probe(struct platform_device *pdev)
 400 {
 401         struct tegra30_i2s *i2s;
 402         u32 cif_ids[2];
 403         struct resource *mem, *memregion;
 404         void __iomem *regs;
 405         int ret;
 406
 407         i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_i2s), GFP_KERNEL);
 408         if (!i2s) {
 409                 dev_err(&pdev->dev, "Can't allocate tegra30_i2s\n");
 410                 ret = -ENOMEM;
 411                 goto err;
 412         }
 413         dev_set_drvdata(&pdev->dev, i2s);
 414
 415         i2s->dai = tegra30_i2s_dai_template;
 416         i2s->dai.name = dev_name(&pdev->dev);
 417
 418         ret = of_property_read_u32_array(pdev->dev.of_node,
 419                                          "nvidia,ahub-cif-ids", cif_ids,
 420                                          ARRAY_SIZE(cif_ids));
 421         if (ret < 0)
 422                 goto err;
 423
 424         i2s->playback_i2s_cif = cif_ids[0];
 425         i2s->capture_i2s_cif = cif_ids[1];
 426
 427         i2s->clk_i2s = clk_get(&pdev->dev, NULL);
 428         if (IS_ERR(i2s->clk_i2s)) {
 429                 dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
 430                 ret = PTR_ERR(i2s->clk_i2s);
 431                 goto err;
 432         }
 433
 434         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 435         if (!mem) {
 436                 dev_err(&pdev->dev, "No memory resource\n");
 437                 ret = -ENODEV;
 438                 goto err_clk_put;
 439         }
 440
 441         memregion = devm_request_mem_region(&pdev->dev, mem->start,
 442                                             resource_size(mem), DRV_NAME);
 443         if (!memregion) {
 444                 dev_err(&pdev->dev, "Memory region already claimed\n");
 445                 ret = -EBUSY;
 446                 goto err_clk_put;
 447         }
 448
 449         regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
 450         if (!regs) {
 451                 dev_err(&pdev->dev, "ioremap failed\n");
 452                 ret = -ENOMEM;
 453                 goto err_clk_put;
 454         }
 455
 456         i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 457                                             &tegra30_i2s_regmap_config);
 458         if (IS_ERR(i2s->regmap)) {
 459                 dev_err(&pdev->dev, "regmap init failed\n");
 460                 ret = PTR_ERR(i2s->regmap);
 461                 goto err_clk_put;
 462         }
 463         regcache_cache_only(i2s->regmap, true);
 464
 465         pm_runtime_enable(&pdev->dev);
 466         if (!pm_runtime_enabled(&pdev->dev)) {
 467                 ret = tegra30_i2s_runtime_resume(&pdev->dev);
 468                 if (ret)
 469                         goto err_pm_disable;
 470         }
 471
 472         ret = snd_soc_register_component(&pdev->dev, &tegra30_i2s_component,
 473                                    &i2s->dai, 1);
 474         if (ret) {
 475                 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
 476                 ret = -ENOMEM;
 477                 goto err_suspend;
 478         }
 479
 480         ret = tegra_pcm_platform_register(&pdev->dev);
 481         if (ret) {
 482                 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
 483                 goto err_unregister_component;
 484         }
 485
 486         return 0;
 487
 488 err_unregister_component:
 489         snd_soc_unregister_component(&pdev->dev);
 490 err_suspend:
 491         if (!pm_runtime_status_suspended(&pdev->dev))
 492                 tegra30_i2s_runtime_suspend(&pdev->dev);
 493 err_pm_disable:
 494         pm_runtime_disable(&pdev->dev);
 495 err_clk_put:
 496         clk_put(i2s->clk_i2s);
 497 err:
 498         return ret;
 499 }
 500
 501 static int tegra30_i2s_platform_remove(struct platform_device *pdev)
 502 {
 503         struct tegra30_i2s *i2s = dev_get_drvdata(&pdev->dev);
 504
 505         pm_runtime_disable(&pdev->dev);
 506         if (!pm_runtime_status_suspended(&pdev->dev))
 507                 tegra30_i2s_runtime_suspend(&pdev->dev);
 508
 509         tegra_pcm_platform_unregister(&pdev->dev);
 510         snd_soc_unregister_component(&pdev->dev);
 511
 512         clk_put(i2s->clk_i2s);
 513
 514         return 0;
 515 }
 516
 517 #ifdef CONFIG_PM_SLEEP
 518 static int tegra30_i2s_suspend(struct device *dev)
 519 {
 520         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
 521
 522         regcache_mark_dirty(i2s->regmap);
 523
 524         return 0;
 525 }
 526
 527 static int tegra30_i2s_resume(struct device *dev)
 528 {
 529         struct tegra30_i2s *i2s = dev_get_drvdata(dev);
 530         int ret;
 531
 532         ret = pm_runtime_get_sync(dev);
 533         if (ret < 0)
 534                 return ret;
 535         ret = regcache_sync(i2s->regmap);
 536         pm_runtime_put(dev);
 537
 538         return ret;
 539 }
 540 #endif
 541
 542 static const struct of_device_id tegra30_i2s_of_match[] = {
 543         { .compatible = "nvidia,tegra30-i2s", },
 544         {},
 545 };
 546
 547 static const struct dev_pm_ops tegra30_i2s_pm_ops = {
 548         SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend,
 549                            tegra30_i2s_runtime_resume, NULL)
 550         SET_SYSTEM_SLEEP_PM_OPS(tegra30_i2s_suspend, tegra30_i2s_resume)
 551 };
 552
 553 static struct platform_driver tegra30_i2s_driver = {
 554         .driver = {
 555                 .name = DRV_NAME,
 556                 .owner = THIS_MODULE,
 557                 .of_match_table = tegra30_i2s_of_match,
 558                 .pm = &tegra30_i2s_pm_ops,
 559         },
 560         .probe = tegra30_i2s_platform_probe,
 561         .remove = tegra30_i2s_platform_remove,
 562 };
 563 module_platform_driver(tegra30_i2s_driver);
 564
 565 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
 566 MODULE_DESCRIPTION("Tegra30 I2S ASoC driver");
 567 MODULE_LICENSE("GPL");
 568 MODULE_ALIAS("platform:" DRV_NAME);
 569 MODULE_DEVICE_TABLE(of, tegra30_i2s_of_match);