sound/soc/tegra/tegra210_dmic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // tegra210_dmic.c - Tegra210 DMIC driver
   4 //
   5 // Copyright (c) 2020 NVIDIA CORPORATION.  All rights reserved.
   6
   7 #include <linux/clk.h>
   8 #include <linux/device.h>
   9 #include <linux/math64.h>
  10 #include <linux/module.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/regmap.h>
  15 #include <sound/core.h>
  16 #include <sound/pcm_params.h>
  17 #include <sound/soc.h>
  18 #include "tegra210_dmic.h"
  19 #include "tegra_cif.h"
  20
  21 static const struct reg_default tegra210_dmic_reg_defaults[] = {
  22         { TEGRA210_DMIC_TX_INT_MASK, 0x00000001 },
  23         { TEGRA210_DMIC_TX_CIF_CTRL, 0x00007700 },
  24         { TEGRA210_DMIC_CG, 0x1 },
  25         { TEGRA210_DMIC_CTRL, 0x00000301 },
  26         /* Below enables all filters - DCR, LP and SC */
  27         { TEGRA210_DMIC_DBG_CTRL, 0xe },
  28         /* Below as per latest POR value */
  29         { TEGRA210_DMIC_DCR_BIQUAD_0_COEF_4, 0x0 },
  30         /* LP filter is configured for pass through and used to apply gain */
  31         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_0, 0x00800000 },
  32         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_1, 0x0 },
  33         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_2, 0x0 },
  34         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_3, 0x0 },
  35         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_4, 0x0 },
  36         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_0, 0x00800000 },
  37         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_1, 0x0 },
  38         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_2, 0x0 },
  39         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_3, 0x0 },
  40         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_4, 0x0 },
  41 };
  42
  43 static int __maybe_unused tegra210_dmic_runtime_suspend(struct device *dev)
  44 {
  45         struct tegra210_dmic *dmic = dev_get_drvdata(dev);
  46
  47         regcache_cache_only(dmic->regmap, true);
  48         regcache_mark_dirty(dmic->regmap);
  49
  50         clk_disable_unprepare(dmic->clk_dmic);
  51
  52         return 0;
  53 }
  54
  55 static int __maybe_unused tegra210_dmic_runtime_resume(struct device *dev)
  56 {
  57         struct tegra210_dmic *dmic = dev_get_drvdata(dev);
  58         int err;
  59
  60         err = clk_prepare_enable(dmic->clk_dmic);
  61         if (err) {
  62                 dev_err(dev, "failed to enable DMIC clock, err: %d\n", err);
  63                 return err;
  64         }
  65
  66         regcache_cache_only(dmic->regmap, false);
  67         regcache_sync(dmic->regmap);
  68
  69         return 0;
  70 }
  71
  72 static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
  73                                    struct snd_pcm_hw_params *params,
  74                                    struct snd_soc_dai *dai)
  75 {
  76         struct tegra210_dmic *dmic = snd_soc_dai_get_drvdata(dai);
  77         unsigned int srate, clk_rate, channels;
  78         struct tegra_cif_conf cif_conf;
  79         unsigned long long gain_q23 = DEFAULT_GAIN_Q23;
  80         int err;
  81
  82         memset(&cif_conf, 0, sizeof(struct tegra_cif_conf));
  83
  84         channels = params_channels(params);
  85
  86         cif_conf.audio_ch = channels;
  87
  88         switch (dmic->ch_select) {
  89         case DMIC_CH_SELECT_LEFT:
  90         case DMIC_CH_SELECT_RIGHT:
  91                 cif_conf.client_ch = 1;
  92                 break;
  93         case DMIC_CH_SELECT_STEREO:
  94                 cif_conf.client_ch = 2;
  95                 break;
  96         default:
  97                 dev_err(dai->dev, "invalid DMIC client channels\n");
  98                 return -EINVAL;
  99         }
 100
 101         srate = params_rate(params);
 102
 103         /*
 104          * DMIC clock rate is a multiple of 'Over Sampling Ratio' and
 105          * 'Sample Rate'. The supported OSR values are 64, 128 and 256.
 106          */
 107         clk_rate = (DMIC_OSR_FACTOR << dmic->osr_val) * srate;
 108
 109         err = clk_set_rate(dmic->clk_dmic, clk_rate);
 110         if (err) {
 111                 dev_err(dai->dev, "can't set DMIC clock rate %u, err: %d\n",
 112                         clk_rate, err);
 113                 return err;
 114         }
 115
 116         regmap_update_bits(dmic->regmap,
 117                            /* Reg */
 118                            TEGRA210_DMIC_CTRL,
 119                            /* Mask */
 120                            TEGRA210_DMIC_CTRL_LRSEL_POLARITY_MASK |
 121                            TEGRA210_DMIC_CTRL_OSR_MASK |
 122                            TEGRA210_DMIC_CTRL_CHANNEL_SELECT_MASK,
 123                            /* Value */
 124                            (dmic->lrsel << LRSEL_POL_SHIFT) |
 125                            (dmic->osr_val << OSR_SHIFT) |
 126                            ((dmic->ch_select + 1) << CH_SEL_SHIFT));
 127
 128         /*
 129          * Use LP filter gain register to apply boost.
 130          * Boost Gain Volume control has 100x factor.
 131          */
 132         if (dmic->boost_gain)
 133                 gain_q23 = div_u64(gain_q23 * dmic->boost_gain, 100);
 134
 135         regmap_write(dmic->regmap, TEGRA210_DMIC_LP_FILTER_GAIN,
 136                      (unsigned int)gain_q23);
 137
 138         switch (params_format(params)) {
 139         case SNDRV_PCM_FORMAT_S16_LE:
 140                 cif_conf.audio_bits = TEGRA_ACIF_BITS_16;
 141                 break;
 142         case SNDRV_PCM_FORMAT_S32_LE:
 143                 cif_conf.audio_bits = TEGRA_ACIF_BITS_32;
 144                 break;
 145         default:
 146                 dev_err(dai->dev, "unsupported format!\n");
 147                 return -EOPNOTSUPP;
 148         }
 149
 150         cif_conf.client_bits = TEGRA_ACIF_BITS_24;
 151         cif_conf.mono_conv = dmic->mono_to_stereo;
 152         cif_conf.stereo_conv = dmic->stereo_to_mono;
 153
 154         tegra_set_cif(dmic->regmap, TEGRA210_DMIC_TX_CIF_CTRL, &cif_conf);
 155
 156         return 0;
 157 }
 158
 159 static int tegra210_dmic_get_boost_gain(struct snd_kcontrol *kcontrol,
 160                                         struct snd_ctl_elem_value *ucontrol)
 161 {
 162         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 163         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 164
 165         ucontrol->value.integer.value[0] = dmic->boost_gain;
 166
 167         return 0;
 168 }
 169
 170 static int tegra210_dmic_put_boost_gain(struct snd_kcontrol *kcontrol,
 171                                         struct snd_ctl_elem_value *ucontrol)
 172 {
 173         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 174         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 175         int value = ucontrol->value.integer.value[0];
 176
 177         if (value == dmic->boost_gain)
 178                 return 0;
 179
 180         dmic->boost_gain = value;
 181
 182         return 1;
 183 }
 184
 185 static int tegra210_dmic_get_ch_select(struct snd_kcontrol *kcontrol,
 186                                        struct snd_ctl_elem_value *ucontrol)
 187 {
 188         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 189         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 190
 191         ucontrol->value.enumerated.item[0] = dmic->ch_select;
 192
 193         return 0;
 194 }
 195
 196 static int tegra210_dmic_put_ch_select(struct snd_kcontrol *kcontrol,
 197                                        struct snd_ctl_elem_value *ucontrol)
 198 {
 199         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 200         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 201         unsigned int value = ucontrol->value.enumerated.item[0];
 202
 203         if (value == dmic->ch_select)
 204                 return 0;
 205
 206         dmic->ch_select = value;
 207
 208         return 1;
 209 }
 210
 211 static int tegra210_dmic_get_mono_to_stereo(struct snd_kcontrol *kcontrol,
 212                                             struct snd_ctl_elem_value *ucontrol)
 213 {
 214         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 215         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 216
 217         ucontrol->value.enumerated.item[0] = dmic->mono_to_stereo;
 218
 219         return 0;
 220 }
 221
 222 static int tegra210_dmic_put_mono_to_stereo(struct snd_kcontrol *kcontrol,
 223                                             struct snd_ctl_elem_value *ucontrol)
 224 {
 225         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 226         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 227         unsigned int value = ucontrol->value.enumerated.item[0];
 228
 229         if (value == dmic->mono_to_stereo)
 230                 return 0;
 231
 232         dmic->mono_to_stereo = value;
 233
 234         return 1;
 235 }
 236
 237 static int tegra210_dmic_get_stereo_to_mono(struct snd_kcontrol *kcontrol,
 238                                             struct snd_ctl_elem_value *ucontrol)
 239 {
 240         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 241         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 242
 243         ucontrol->value.enumerated.item[0] = dmic->stereo_to_mono;
 244
 245         return 0;
 246 }
 247
 248 static int tegra210_dmic_put_stereo_to_mono(struct snd_kcontrol *kcontrol,
 249                                             struct snd_ctl_elem_value *ucontrol)
 250 {
 251         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 252         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 253         unsigned int value = ucontrol->value.enumerated.item[0];
 254
 255         if (value == dmic->stereo_to_mono)
 256                 return 0;
 257
 258         dmic->stereo_to_mono = value;
 259
 260         return 1;
 261 }
 262
 263 static int tegra210_dmic_get_osr_val(struct snd_kcontrol *kcontrol,
 264                                      struct snd_ctl_elem_value *ucontrol)
 265 {
 266         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 267         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 268
 269         ucontrol->value.enumerated.item[0] = dmic->osr_val;
 270
 271         return 0;
 272 }
 273
 274 static int tegra210_dmic_put_osr_val(struct snd_kcontrol *kcontrol,
 275                                      struct snd_ctl_elem_value *ucontrol)
 276 {
 277         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 278         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 279         unsigned int value = ucontrol->value.enumerated.item[0];
 280
 281         if (value == dmic->osr_val)
 282                 return 0;
 283
 284         dmic->osr_val = value;
 285
 286         return 1;
 287 }
 288
 289 static int tegra210_dmic_get_pol_sel(struct snd_kcontrol *kcontrol,
 290                                      struct snd_ctl_elem_value *ucontrol)
 291 {
 292         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 293         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 294
 295         ucontrol->value.enumerated.item[0] = dmic->lrsel;
 296
 297         return 0;
 298 }
 299
 300 static int tegra210_dmic_put_pol_sel(struct snd_kcontrol *kcontrol,
 301                                      struct snd_ctl_elem_value *ucontrol)
 302 {
 303         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 304         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 305         unsigned int value = ucontrol->value.enumerated.item[0];
 306
 307         if (value == dmic->lrsel)
 308                 return 0;
 309
 310         dmic->lrsel = value;
 311
 312         return 1;
 313 }
 314
 315 static const struct snd_soc_dai_ops tegra210_dmic_dai_ops = {
 316         .hw_params      = tegra210_dmic_hw_params,
 317 };
 318
 319 static struct snd_soc_dai_driver tegra210_dmic_dais[] = {
 320         {
 321                 .name = "DMIC-CIF",
 322                 .capture = {
 323                         .stream_name = "CIF-Capture",
 324                         .channels_min = 1,
 325                         .channels_max = 2,
 326                         .rates = SNDRV_PCM_RATE_8000_48000,
 327                         .formats = SNDRV_PCM_FMTBIT_S16_LE |
 328                                    SNDRV_PCM_FMTBIT_S32_LE,
 329                 },
 330         },
 331         {
 332                 .name = "DMIC-DAP",
 333                 .capture = {
 334                         .stream_name = "DAP-Capture",
 335                         .channels_min = 1,
 336                         .channels_max = 2,
 337                         .rates = SNDRV_PCM_RATE_8000_48000,
 338                         .formats = SNDRV_PCM_FMTBIT_S16_LE |
 339                                    SNDRV_PCM_FMTBIT_S32_LE,
 340                 },
 341                 .ops = &tegra210_dmic_dai_ops,
 342                 .symmetric_rate = 1,
 343         },
 344 };
 345
 346 static const struct snd_soc_dapm_widget tegra210_dmic_widgets[] = {
 347         SND_SOC_DAPM_AIF_OUT("TX", NULL, 0, TEGRA210_DMIC_ENABLE, 0, 0),
 348         SND_SOC_DAPM_MIC("MIC", NULL),
 349 };
 350
 351 static const struct snd_soc_dapm_route tegra210_dmic_routes[] = {
 352         { "XBAR-RX",            NULL,   "XBAR-Capture" },
 353         { "XBAR-Capture",       NULL,   "CIF-Capture" },
 354         { "CIF-Capture",        NULL,   "TX" },
 355         { "TX",                 NULL,   "DAP-Capture" },
 356         { "DAP-Capture",        NULL,   "MIC" },
 357 };
 358
 359 static const char * const tegra210_dmic_ch_select[] = {
 360         "Left", "Right", "Stereo",
 361 };
 362
 363 static const struct soc_enum tegra210_dmic_ch_enum =
 364         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_ch_select),
 365                         tegra210_dmic_ch_select);
 366
 367 static const char * const tegra210_dmic_mono_conv_text[] = {
 368         "Zero", "Copy",
 369 };
 370
 371 static const char * const tegra210_dmic_stereo_conv_text[] = {
 372         "CH0", "CH1", "AVG",
 373 };
 374
 375 static const struct soc_enum tegra210_dmic_mono_conv_enum =
 376         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_mono_conv_text),
 377                         tegra210_dmic_mono_conv_text);
 378
 379 static const struct soc_enum tegra210_dmic_stereo_conv_enum =
 380         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_stereo_conv_text),
 381                         tegra210_dmic_stereo_conv_text);
 382
 383 static const char * const tegra210_dmic_osr_text[] = {
 384         "OSR_64", "OSR_128", "OSR_256",
 385 };
 386
 387 static const struct soc_enum tegra210_dmic_osr_enum =
 388         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_osr_text),
 389                         tegra210_dmic_osr_text);
 390
 391 static const char * const tegra210_dmic_lrsel_text[] = {
 392         "Left", "Right",
 393 };
 394
 395 static const struct soc_enum tegra210_dmic_lrsel_enum =
 396         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_lrsel_text),
 397                         tegra210_dmic_lrsel_text);
 398
 399 static const struct snd_kcontrol_new tegra210_dmic_controls[] = {
 400         SOC_SINGLE_EXT("Boost Gain Volume", 0, 0, MAX_BOOST_GAIN, 0,
 401                        tegra210_dmic_get_boost_gain,
 402                        tegra210_dmic_put_boost_gain),
 403         SOC_ENUM_EXT("Channel Select", tegra210_dmic_ch_enum,
 404                      tegra210_dmic_get_ch_select, tegra210_dmic_put_ch_select),
 405         SOC_ENUM_EXT("Mono To Stereo",
 406                      tegra210_dmic_mono_conv_enum,
 407                      tegra210_dmic_get_mono_to_stereo,
 408                      tegra210_dmic_put_mono_to_stereo),
 409         SOC_ENUM_EXT("Stereo To Mono",
 410                      tegra210_dmic_stereo_conv_enum,
 411                      tegra210_dmic_get_stereo_to_mono,
 412                      tegra210_dmic_put_stereo_to_mono),
 413         SOC_ENUM_EXT("OSR Value", tegra210_dmic_osr_enum,
 414                      tegra210_dmic_get_osr_val, tegra210_dmic_put_osr_val),
 415         SOC_ENUM_EXT("LR Polarity Select", tegra210_dmic_lrsel_enum,
 416                      tegra210_dmic_get_pol_sel, tegra210_dmic_put_pol_sel),
 417 };
 418
 419 static const struct snd_soc_component_driver tegra210_dmic_compnt = {
 420         .dapm_widgets           = tegra210_dmic_widgets,
 421         .num_dapm_widgets       = ARRAY_SIZE(tegra210_dmic_widgets),
 422         .dapm_routes            = tegra210_dmic_routes,
 423         .num_dapm_routes        = ARRAY_SIZE(tegra210_dmic_routes),
 424         .controls               = tegra210_dmic_controls,
 425         .num_controls           = ARRAY_SIZE(tegra210_dmic_controls),
 426 };
 427
 428 static bool tegra210_dmic_wr_reg(struct device *dev, unsigned int reg)
 429 {
 430         switch (reg) {
 431         case TEGRA210_DMIC_TX_INT_MASK ... TEGRA210_DMIC_TX_CIF_CTRL:
 432         case TEGRA210_DMIC_ENABLE ... TEGRA210_DMIC_CG:
 433         case TEGRA210_DMIC_CTRL:
 434         case TEGRA210_DMIC_DBG_CTRL:
 435         case TEGRA210_DMIC_DCR_BIQUAD_0_COEF_4 ... TEGRA210_DMIC_LP_BIQUAD_1_COEF_4:
 436                 return true;
 437         default:
 438                 return false;
 439         }
 440 }
 441
 442 static bool tegra210_dmic_rd_reg(struct device *dev, unsigned int reg)
 443 {
 444         if (tegra210_dmic_wr_reg(dev, reg))
 445                 return true;
 446
 447         switch (reg) {
 448         case TEGRA210_DMIC_TX_STATUS:
 449         case TEGRA210_DMIC_TX_INT_STATUS:
 450         case TEGRA210_DMIC_STATUS:
 451         case TEGRA210_DMIC_INT_STATUS:
 452                 return true;
 453         default:
 454                 return false;
 455         }
 456 }
 457
 458 static bool tegra210_dmic_volatile_reg(struct device *dev, unsigned int reg)
 459 {
 460         switch (reg) {
 461         case TEGRA210_DMIC_TX_STATUS:
 462         case TEGRA210_DMIC_TX_INT_STATUS:
 463         case TEGRA210_DMIC_TX_INT_SET:
 464         case TEGRA210_DMIC_SOFT_RESET:
 465         case TEGRA210_DMIC_STATUS:
 466         case TEGRA210_DMIC_INT_STATUS:
 467                 return true;
 468         default:
 469                 return false;
 470         }
 471 }
 472
 473 static const struct regmap_config tegra210_dmic_regmap_config = {
 474         .reg_bits = 32,
 475         .reg_stride = 4,
 476         .val_bits = 32,
 477         .max_register = TEGRA210_DMIC_LP_BIQUAD_1_COEF_4,
 478         .writeable_reg = tegra210_dmic_wr_reg,
 479         .readable_reg = tegra210_dmic_rd_reg,
 480         .volatile_reg = tegra210_dmic_volatile_reg,
 481         .reg_defaults = tegra210_dmic_reg_defaults,
 482         .num_reg_defaults = ARRAY_SIZE(tegra210_dmic_reg_defaults),
 483         .cache_type = REGCACHE_FLAT,
 484 };
 485
 486 static int tegra210_dmic_probe(struct platform_device *pdev)
 487 {
 488         struct device *dev = &pdev->dev;
 489         struct tegra210_dmic *dmic;
 490         void __iomem *regs;
 491         int err;
 492
 493         dmic = devm_kzalloc(dev, sizeof(*dmic), GFP_KERNEL);
 494         if (!dmic)
 495                 return -ENOMEM;
 496
 497         dmic->osr_val = DMIC_OSR_64;
 498         dmic->ch_select = DMIC_CH_SELECT_STEREO;
 499         dmic->lrsel = DMIC_LRSEL_LEFT;
 500         dmic->boost_gain = 0;
 501         dmic->stereo_to_mono = 0; /* "CH0" */
 502
 503         dev_set_drvdata(dev, dmic);
 504
 505         dmic->clk_dmic = devm_clk_get(dev, "dmic");
 506         if (IS_ERR(dmic->clk_dmic)) {
 507                 dev_err(dev, "can't retrieve DMIC clock\n");
 508                 return PTR_ERR(dmic->clk_dmic);
 509         }
 510
 511         regs = devm_platform_ioremap_resource(pdev, 0);
 512         if (IS_ERR(regs))
 513                 return PTR_ERR(regs);
 514
 515         dmic->regmap = devm_regmap_init_mmio(dev, regs,
 516                                              &tegra210_dmic_regmap_config);
 517         if (IS_ERR(dmic->regmap)) {
 518                 dev_err(dev, "regmap init failed\n");
 519                 return PTR_ERR(dmic->regmap);
 520         }
 521
 522         regcache_cache_only(dmic->regmap, true);
 523
 524         err = devm_snd_soc_register_component(dev, &tegra210_dmic_compnt,
 525                                               tegra210_dmic_dais,
 526                                               ARRAY_SIZE(tegra210_dmic_dais));
 527         if (err) {
 528                 dev_err(dev, "can't register DMIC component, err: %d\n", err);
 529                 return err;
 530         }
 531
 532         pm_runtime_enable(dev);
 533
 534         return 0;
 535 }
 536
 537 static int tegra210_dmic_remove(struct platform_device *pdev)
 538 {
 539         pm_runtime_disable(&pdev->dev);
 540
 541         return 0;
 542 }
 543
 544 static const struct dev_pm_ops tegra210_dmic_pm_ops = {
 545         SET_RUNTIME_PM_OPS(tegra210_dmic_runtime_suspend,
 546                            tegra210_dmic_runtime_resume, NULL)
 547         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 548                                 pm_runtime_force_resume)
 549 };
 550
 551 static const struct of_device_id tegra210_dmic_of_match[] = {
 552         { .compatible = "nvidia,tegra210-dmic" },
 553         {},
 554 };
 555 MODULE_DEVICE_TABLE(of, tegra210_dmic_of_match);
 556
 557 static struct platform_driver tegra210_dmic_driver = {
 558         .driver = {
 559                 .name = "tegra210-dmic",
 560                 .of_match_table = tegra210_dmic_of_match,
 561                 .pm = &tegra210_dmic_pm_ops,
 562         },
 563         .probe = tegra210_dmic_probe,
 564         .remove = tegra210_dmic_remove,
 565 };
 566 module_platform_driver(tegra210_dmic_driver)
 567
 568 MODULE_AUTHOR("Rahul Mittal <rmittal@nvidia.com>");
 569 MODULE_DESCRIPTION("Tegra210 ASoC DMIC driver");
 570 MODULE_LICENSE("GPL v2");