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/of_device.h> 34 #include <linux/platform_device.h> 35 #include <linux/pm_runtime.h> 36 #include <linux/regmap.h> 37 #include <linux/slab.h> 38 #include <sound/core.h> 39 #include <sound/pcm.h> 40 #include <sound/pcm_params.h> 41 #include <sound/soc.h> 42 #include <sound/dmaengine_pcm.h> 43 44 #include "tegra30_ahub.h" 45 #include "tegra30_i2s.h" 46 47 #define DRV_NAME "tegra30-i2s" 48 49 static int tegra30_i2s_runtime_suspend(struct device *dev) 50 { 51 struct tegra30_i2s *i2s = dev_get_drvdata(dev); 52 53 regcache_cache_only(i2s->regmap, true); 54 55 clk_disable_unprepare(i2s->clk_i2s); 56 57 return 0; 58 } 59 60 static int tegra30_i2s_runtime_resume(struct device *dev) 61 { 62 struct tegra30_i2s *i2s = dev_get_drvdata(dev); 63 int ret; 64 65 ret = clk_prepare_enable(i2s->clk_i2s); 66 if (ret) { 67 dev_err(dev, "clk_enable failed: %d\n", ret); 68 return ret; 69 } 70 71 regcache_cache_only(i2s->regmap, false); 72 73 return 0; 74 } 75 76 static int tegra30_i2s_set_fmt(struct snd_soc_dai *dai, 77 unsigned int fmt) 78 { 79 struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai); 80 unsigned int mask = 0, val = 0; 81 82 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 83 case SND_SOC_DAIFMT_NB_NF: 84 break; 85 default: 86 return -EINVAL; 87 } 88 89 mask |= TEGRA30_I2S_CTRL_MASTER_ENABLE; 90 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 91 case SND_SOC_DAIFMT_CBS_CFS: 92 val |= TEGRA30_I2S_CTRL_MASTER_ENABLE; 93 break; 94 case SND_SOC_DAIFMT_CBM_CFM: 95 break; 96 default: 97 return -EINVAL; 98 } 99 100 mask |= TEGRA30_I2S_CTRL_FRAME_FORMAT_MASK | 101 TEGRA30_I2S_CTRL_LRCK_MASK; 102 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 103 case SND_SOC_DAIFMT_DSP_A: 104 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC; 105 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW; 106 break; 107 case SND_SOC_DAIFMT_DSP_B: 108 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_FSYNC; 109 val |= TEGRA30_I2S_CTRL_LRCK_R_LOW; 110 break; 111 case SND_SOC_DAIFMT_I2S: 112 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK; 113 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW; 114 break; 115 case SND_SOC_DAIFMT_RIGHT_J: 116 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK; 117 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW; 118 break; 119 case SND_SOC_DAIFMT_LEFT_J: 120 val |= TEGRA30_I2S_CTRL_FRAME_FORMAT_LRCK; 121 val |= TEGRA30_I2S_CTRL_LRCK_L_LOW; 122 break; 123 default: 124 return -EINVAL; 125 } 126 127 pm_runtime_get_sync(dai->dev); 128 regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val); 129 pm_runtime_put(dai->dev); 130 131 return 0; 132 } 133 134 static int tegra30_i2s_hw_params(struct snd_pcm_substream *substream, 135 struct snd_pcm_hw_params *params, 136 struct snd_soc_dai *dai) 137 { 138 struct device *dev = dai->dev; 139 struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai); 140 unsigned int mask, val, reg; 141 int ret, sample_size, srate, i2sclock, bitcnt; 142 struct tegra30_ahub_cif_conf cif_conf; 143 144 if (params_channels(params) != 2) 145 return -EINVAL; 146 147 mask = TEGRA30_I2S_CTRL_BIT_SIZE_MASK; 148 switch (params_format(params)) { 149 case SNDRV_PCM_FORMAT_S16_LE: 150 val = TEGRA30_I2S_CTRL_BIT_SIZE_16; 151 sample_size = 16; 152 break; 153 default: 154 return -EINVAL; 155 } 156 157 regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, mask, val); 158 159 srate = params_rate(params); 160 161 /* Final "* 2" required by Tegra hardware */ 162 i2sclock = srate * params_channels(params) * sample_size * 2; 163 164 bitcnt = (i2sclock / (2 * srate)) - 1; 165 if (bitcnt < 0 || bitcnt > TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US) 166 return -EINVAL; 167 168 ret = clk_set_rate(i2s->clk_i2s, i2sclock); 169 if (ret) { 170 dev_err(dev, "Can't set I2S clock rate: %d\n", ret); 171 return ret; 172 } 173 174 val = bitcnt << TEGRA30_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT; 175 176 if (i2sclock % (2 * srate)) 177 val |= TEGRA30_I2S_TIMING_NON_SYM_ENABLE; 178 179 regmap_write(i2s->regmap, TEGRA30_I2S_TIMING, val); 180 181 cif_conf.threshold = 0; 182 cif_conf.audio_channels = 2; 183 cif_conf.client_channels = 2; 184 cif_conf.audio_bits = TEGRA30_AUDIOCIF_BITS_16; 185 cif_conf.client_bits = TEGRA30_AUDIOCIF_BITS_16; 186 cif_conf.expand = 0; 187 cif_conf.stereo_conv = 0; 188 cif_conf.replicate = 0; 189 cif_conf.truncate = 0; 190 cif_conf.mono_conv = 0; 191 192 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 193 cif_conf.direction = TEGRA30_AUDIOCIF_DIRECTION_RX; 194 reg = TEGRA30_I2S_CIF_RX_CTRL; 195 } else { 196 cif_conf.direction = TEGRA30_AUDIOCIF_DIRECTION_TX; 197 reg = TEGRA30_I2S_CIF_TX_CTRL; 198 } 199 200 i2s->soc_data->set_audio_cif(i2s->regmap, reg, &cif_conf); 201 202 val = (1 << TEGRA30_I2S_OFFSET_RX_DATA_OFFSET_SHIFT) | 203 (1 << TEGRA30_I2S_OFFSET_TX_DATA_OFFSET_SHIFT); 204 regmap_write(i2s->regmap, TEGRA30_I2S_OFFSET, val); 205 206 return 0; 207 } 208 209 static void tegra30_i2s_start_playback(struct tegra30_i2s *i2s) 210 { 211 tegra30_ahub_enable_tx_fifo(i2s->playback_fifo_cif); 212 regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, 213 TEGRA30_I2S_CTRL_XFER_EN_TX, 214 TEGRA30_I2S_CTRL_XFER_EN_TX); 215 } 216 217 static void tegra30_i2s_stop_playback(struct tegra30_i2s *i2s) 218 { 219 tegra30_ahub_disable_tx_fifo(i2s->playback_fifo_cif); 220 regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, 221 TEGRA30_I2S_CTRL_XFER_EN_TX, 0); 222 } 223 224 static void tegra30_i2s_start_capture(struct tegra30_i2s *i2s) 225 { 226 tegra30_ahub_enable_rx_fifo(i2s->capture_fifo_cif); 227 regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, 228 TEGRA30_I2S_CTRL_XFER_EN_RX, 229 TEGRA30_I2S_CTRL_XFER_EN_RX); 230 } 231 232 static void tegra30_i2s_stop_capture(struct tegra30_i2s *i2s) 233 { 234 tegra30_ahub_disable_rx_fifo(i2s->capture_fifo_cif); 235 regmap_update_bits(i2s->regmap, TEGRA30_I2S_CTRL, 236 TEGRA30_I2S_CTRL_XFER_EN_RX, 0); 237 } 238 239 static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd, 240 struct snd_soc_dai *dai) 241 { 242 struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai); 243 244 switch (cmd) { 245 case SNDRV_PCM_TRIGGER_START: 246 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 247 case SNDRV_PCM_TRIGGER_RESUME: 248 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 249 tegra30_i2s_start_playback(i2s); 250 else 251 tegra30_i2s_start_capture(i2s); 252 break; 253 case SNDRV_PCM_TRIGGER_STOP: 254 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 255 case SNDRV_PCM_TRIGGER_SUSPEND: 256 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 257 tegra30_i2s_stop_playback(i2s); 258 else 259 tegra30_i2s_stop_capture(i2s); 260 break; 261 default: 262 return -EINVAL; 263 } 264 265 return 0; 266 } 267 268 static int tegra30_i2s_probe(struct snd_soc_dai *dai) 269 { 270 struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai); 271 272 dai->capture_dma_data = &i2s->capture_dma_data; 273 dai->playback_dma_data = &i2s->playback_dma_data; 274 275 return 0; 276 } 277 278 static struct snd_soc_dai_ops tegra30_i2s_dai_ops = { 279 .set_fmt = tegra30_i2s_set_fmt, 280 .hw_params = tegra30_i2s_hw_params, 281 .trigger = tegra30_i2s_trigger, 282 }; 283 284 static const struct snd_soc_dai_driver tegra30_i2s_dai_template = { 285 .probe = tegra30_i2s_probe, 286 .playback = { 287 .stream_name = "Playback", 288 .channels_min = 2, 289 .channels_max = 2, 290 .rates = SNDRV_PCM_RATE_8000_96000, 291 .formats = SNDRV_PCM_FMTBIT_S16_LE, 292 }, 293 .capture = { 294 .stream_name = "Capture", 295 .channels_min = 2, 296 .channels_max = 2, 297 .rates = SNDRV_PCM_RATE_8000_96000, 298 .formats = SNDRV_PCM_FMTBIT_S16_LE, 299 }, 300 .ops = &tegra30_i2s_dai_ops, 301 .symmetric_rates = 1, 302 }; 303 304 static const struct snd_soc_component_driver tegra30_i2s_component = { 305 .name = DRV_NAME, 306 }; 307 308 static bool tegra30_i2s_wr_rd_reg(struct device *dev, unsigned int reg) 309 { 310 switch (reg) { 311 case TEGRA30_I2S_CTRL: 312 case TEGRA30_I2S_TIMING: 313 case TEGRA30_I2S_OFFSET: 314 case TEGRA30_I2S_CH_CTRL: 315 case TEGRA30_I2S_SLOT_CTRL: 316 case TEGRA30_I2S_CIF_RX_CTRL: 317 case TEGRA30_I2S_CIF_TX_CTRL: 318 case TEGRA30_I2S_FLOWCTL: 319 case TEGRA30_I2S_TX_STEP: 320 case TEGRA30_I2S_FLOW_STATUS: 321 case TEGRA30_I2S_FLOW_TOTAL: 322 case TEGRA30_I2S_FLOW_OVER: 323 case TEGRA30_I2S_FLOW_UNDER: 324 case TEGRA30_I2S_LCOEF_1_4_0: 325 case TEGRA30_I2S_LCOEF_1_4_1: 326 case TEGRA30_I2S_LCOEF_1_4_2: 327 case TEGRA30_I2S_LCOEF_1_4_3: 328 case TEGRA30_I2S_LCOEF_1_4_4: 329 case TEGRA30_I2S_LCOEF_1_4_5: 330 case TEGRA30_I2S_LCOEF_2_4_0: 331 case TEGRA30_I2S_LCOEF_2_4_1: 332 case TEGRA30_I2S_LCOEF_2_4_2: 333 return true; 334 default: 335 return false; 336 } 337 } 338 339 static bool tegra30_i2s_volatile_reg(struct device *dev, unsigned int reg) 340 { 341 switch (reg) { 342 case TEGRA30_I2S_FLOW_STATUS: 343 case TEGRA30_I2S_FLOW_TOTAL: 344 case TEGRA30_I2S_FLOW_OVER: 345 case TEGRA30_I2S_FLOW_UNDER: 346 return true; 347 default: 348 return false; 349 } 350 } 351 352 static const struct regmap_config tegra30_i2s_regmap_config = { 353 .reg_bits = 32, 354 .reg_stride = 4, 355 .val_bits = 32, 356 .max_register = TEGRA30_I2S_LCOEF_2_4_2, 357 .writeable_reg = tegra30_i2s_wr_rd_reg, 358 .readable_reg = tegra30_i2s_wr_rd_reg, 359 .volatile_reg = tegra30_i2s_volatile_reg, 360 .cache_type = REGCACHE_FLAT, 361 }; 362 363 static const struct tegra30_i2s_soc_data tegra30_i2s_config = { 364 .set_audio_cif = tegra30_ahub_set_cif, 365 }; 366 367 static const struct tegra30_i2s_soc_data tegra124_i2s_config = { 368 .set_audio_cif = tegra124_ahub_set_cif, 369 }; 370 371 static const struct of_device_id tegra30_i2s_of_match[] = { 372 { .compatible = "nvidia,tegra124-i2s", .data = &tegra124_i2s_config }, 373 { .compatible = "nvidia,tegra30-i2s", .data = &tegra30_i2s_config }, 374 {}, 375 }; 376 377 static int tegra30_i2s_platform_probe(struct platform_device *pdev) 378 { 379 struct tegra30_i2s *i2s; 380 const struct of_device_id *match; 381 u32 cif_ids[2]; 382 struct resource *mem, *memregion; 383 void __iomem *regs; 384 int ret; 385 386 i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra30_i2s), GFP_KERNEL); 387 if (!i2s) { 388 dev_err(&pdev->dev, "Can't allocate tegra30_i2s\n"); 389 ret = -ENOMEM; 390 goto err; 391 } 392 dev_set_drvdata(&pdev->dev, i2s); 393 394 match = of_match_device(tegra30_i2s_of_match, &pdev->dev); 395 if (!match) { 396 dev_err(&pdev->dev, "Error: No device match found\n"); 397 ret = -ENODEV; 398 goto err; 399 } 400 i2s->soc_data = (struct tegra30_i2s_soc_data *)match->data; 401 402 i2s->dai = tegra30_i2s_dai_template; 403 i2s->dai.name = dev_name(&pdev->dev); 404 405 ret = of_property_read_u32_array(pdev->dev.of_node, 406 "nvidia,ahub-cif-ids", cif_ids, 407 ARRAY_SIZE(cif_ids)); 408 if (ret < 0) 409 goto err; 410 411 i2s->playback_i2s_cif = cif_ids[0]; 412 i2s->capture_i2s_cif = cif_ids[1]; 413 414 i2s->clk_i2s = clk_get(&pdev->dev, NULL); 415 if (IS_ERR(i2s->clk_i2s)) { 416 dev_err(&pdev->dev, "Can't retrieve i2s clock\n"); 417 ret = PTR_ERR(i2s->clk_i2s); 418 goto err; 419 } 420 421 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 422 if (!mem) { 423 dev_err(&pdev->dev, "No memory resource\n"); 424 ret = -ENODEV; 425 goto err_clk_put; 426 } 427 428 memregion = devm_request_mem_region(&pdev->dev, mem->start, 429 resource_size(mem), DRV_NAME); 430 if (!memregion) { 431 dev_err(&pdev->dev, "Memory region already claimed\n"); 432 ret = -EBUSY; 433 goto err_clk_put; 434 } 435 436 regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem)); 437 if (!regs) { 438 dev_err(&pdev->dev, "ioremap failed\n"); 439 ret = -ENOMEM; 440 goto err_clk_put; 441 } 442 443 i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs, 444 &tegra30_i2s_regmap_config); 445 if (IS_ERR(i2s->regmap)) { 446 dev_err(&pdev->dev, "regmap init failed\n"); 447 ret = PTR_ERR(i2s->regmap); 448 goto err_clk_put; 449 } 450 regcache_cache_only(i2s->regmap, true); 451 452 pm_runtime_enable(&pdev->dev); 453 if (!pm_runtime_enabled(&pdev->dev)) { 454 ret = tegra30_i2s_runtime_resume(&pdev->dev); 455 if (ret) 456 goto err_pm_disable; 457 } 458 459 i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 460 i2s->playback_dma_data.maxburst = 4; 461 ret = tegra30_ahub_allocate_tx_fifo(&i2s->playback_fifo_cif, 462 i2s->playback_dma_chan, 463 sizeof(i2s->playback_dma_chan), 464 &i2s->playback_dma_data.addr); 465 if (ret) { 466 dev_err(&pdev->dev, "Could not alloc TX FIFO: %d\n", ret); 467 goto err_suspend; 468 } 469 ret = tegra30_ahub_set_rx_cif_source(i2s->playback_i2s_cif, 470 i2s->playback_fifo_cif); 471 if (ret) { 472 dev_err(&pdev->dev, "Could not route TX FIFO: %d\n", ret); 473 goto err_free_tx_fifo; 474 } 475 476 i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 477 i2s->capture_dma_data.maxburst = 4; 478 ret = tegra30_ahub_allocate_rx_fifo(&i2s->capture_fifo_cif, 479 i2s->capture_dma_chan, 480 sizeof(i2s->capture_dma_chan), 481 &i2s->capture_dma_data.addr); 482 if (ret) { 483 dev_err(&pdev->dev, "Could not alloc RX FIFO: %d\n", ret); 484 goto err_unroute_tx_fifo; 485 } 486 ret = tegra30_ahub_set_rx_cif_source(i2s->capture_fifo_cif, 487 i2s->capture_i2s_cif); 488 if (ret) { 489 dev_err(&pdev->dev, "Could not route TX FIFO: %d\n", ret); 490 goto err_free_rx_fifo; 491 } 492 493 ret = snd_soc_register_component(&pdev->dev, &tegra30_i2s_component, 494 &i2s->dai, 1); 495 if (ret) { 496 dev_err(&pdev->dev, "Could not register DAI: %d\n", ret); 497 ret = -ENOMEM; 498 goto err_unroute_rx_fifo; 499 } 500 501 ret = tegra_pcm_platform_register_with_chan_names(&pdev->dev, 502 &i2s->dma_config, i2s->playback_dma_chan, 503 i2s->capture_dma_chan); 504 if (ret) { 505 dev_err(&pdev->dev, "Could not register PCM: %d\n", ret); 506 goto err_unregister_component; 507 } 508 509 return 0; 510 511 err_unregister_component: 512 snd_soc_unregister_component(&pdev->dev); 513 err_unroute_rx_fifo: 514 tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif); 515 err_free_rx_fifo: 516 tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif); 517 err_unroute_tx_fifo: 518 tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif); 519 err_free_tx_fifo: 520 tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif); 521 err_suspend: 522 if (!pm_runtime_status_suspended(&pdev->dev)) 523 tegra30_i2s_runtime_suspend(&pdev->dev); 524 err_pm_disable: 525 pm_runtime_disable(&pdev->dev); 526 err_clk_put: 527 clk_put(i2s->clk_i2s); 528 err: 529 return ret; 530 } 531 532 static int tegra30_i2s_platform_remove(struct platform_device *pdev) 533 { 534 struct tegra30_i2s *i2s = dev_get_drvdata(&pdev->dev); 535 536 pm_runtime_disable(&pdev->dev); 537 if (!pm_runtime_status_suspended(&pdev->dev)) 538 tegra30_i2s_runtime_suspend(&pdev->dev); 539 540 tegra_pcm_platform_unregister(&pdev->dev); 541 snd_soc_unregister_component(&pdev->dev); 542 543 tegra30_ahub_unset_rx_cif_source(i2s->capture_fifo_cif); 544 tegra30_ahub_free_rx_fifo(i2s->capture_fifo_cif); 545 546 tegra30_ahub_unset_rx_cif_source(i2s->playback_i2s_cif); 547 tegra30_ahub_free_tx_fifo(i2s->playback_fifo_cif); 548 549 clk_put(i2s->clk_i2s); 550 551 return 0; 552 } 553 554 #ifdef CONFIG_PM_SLEEP 555 static int tegra30_i2s_suspend(struct device *dev) 556 { 557 struct tegra30_i2s *i2s = dev_get_drvdata(dev); 558 559 regcache_mark_dirty(i2s->regmap); 560 561 return 0; 562 } 563 564 static int tegra30_i2s_resume(struct device *dev) 565 { 566 struct tegra30_i2s *i2s = dev_get_drvdata(dev); 567 int ret; 568 569 ret = pm_runtime_get_sync(dev); 570 if (ret < 0) 571 return ret; 572 ret = regcache_sync(i2s->regmap); 573 pm_runtime_put(dev); 574 575 return ret; 576 } 577 #endif 578 579 static const struct dev_pm_ops tegra30_i2s_pm_ops = { 580 SET_RUNTIME_PM_OPS(tegra30_i2s_runtime_suspend, 581 tegra30_i2s_runtime_resume, NULL) 582 SET_SYSTEM_SLEEP_PM_OPS(tegra30_i2s_suspend, tegra30_i2s_resume) 583 }; 584 585 static struct platform_driver tegra30_i2s_driver = { 586 .driver = { 587 .name = DRV_NAME, 588 .of_match_table = tegra30_i2s_of_match, 589 .pm = &tegra30_i2s_pm_ops, 590 }, 591 .probe = tegra30_i2s_platform_probe, 592 .remove = tegra30_i2s_platform_remove, 593 }; 594 module_platform_driver(tegra30_i2s_driver); 595 596 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 597 MODULE_DESCRIPTION("Tegra30 I2S ASoC driver"); 598 MODULE_LICENSE("GPL"); 599 MODULE_ALIAS("platform:" DRV_NAME); 600 MODULE_DEVICE_TABLE(of, tegra30_i2s_of_match); 601