drivers/iio/adc/rcar-gyroadc.c

   1 /*
   2  * Renesas R-Car GyroADC driver
   3  *
   4  * Copyright 2016 Marek Vasut <marek.vasut@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/delay.h>
  20 #include <linux/kernel.h>
  21 #include <linux/slab.h>
  22 #include <linux/io.h>
  23 #include <linux/clk.h>
  24 #include <linux/of.h>
  25 #include <linux/of_irq.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <linux/of_platform.h>
  28 #include <linux/err.h>
  29 #include <linux/pm_runtime.h>
  30
  31 #include <linux/iio/iio.h>
  32 #include <linux/iio/sysfs.h>
  33 #include <linux/iio/trigger.h>
  34
  35 #define DRIVER_NAME                             "rcar-gyroadc"
  36
  37 /* GyroADC registers. */
  38 #define RCAR_GYROADC_MODE_SELECT                0x00
  39 #define RCAR_GYROADC_MODE_SELECT_1_MB88101A     0x0
  40 #define RCAR_GYROADC_MODE_SELECT_2_ADCS7476     0x1
  41 #define RCAR_GYROADC_MODE_SELECT_3_MAX1162      0x3
  42
  43 #define RCAR_GYROADC_START_STOP                 0x04
  44 #define RCAR_GYROADC_START_STOP_START           BIT(0)
  45
  46 #define RCAR_GYROADC_CLOCK_LENGTH               0x08
  47 #define RCAR_GYROADC_1_25MS_LENGTH              0x0c
  48
  49 #define RCAR_GYROADC_REALTIME_DATA(ch)          (0x10 + ((ch) * 4))
  50 #define RCAR_GYROADC_100MS_ADDED_DATA(ch)       (0x30 + ((ch) * 4))
  51 #define RCAR_GYROADC_10MS_AVG_DATA(ch)          (0x50 + ((ch) * 4))
  52
  53 #define RCAR_GYROADC_FIFO_STATUS                0x70
  54 #define RCAR_GYROADC_FIFO_STATUS_EMPTY(ch)      BIT(0 + (4 * (ch)))
  55 #define RCAR_GYROADC_FIFO_STATUS_FULL(ch)       BIT(1 + (4 * (ch)))
  56 #define RCAR_GYROADC_FIFO_STATUS_ERROR(ch)      BIT(2 + (4 * (ch)))
  57
  58 #define RCAR_GYROADC_INTR                       0x74
  59 #define RCAR_GYROADC_INTR_INT                   BIT(0)
  60
  61 #define RCAR_GYROADC_INTENR                     0x78
  62 #define RCAR_GYROADC_INTENR_INTEN               BIT(0)
  63
  64 #define RCAR_GYROADC_SAMPLE_RATE                800     /* Hz */
  65
  66 #define RCAR_GYROADC_RUNTIME_PM_DELAY_MS        2000
  67
  68 enum rcar_gyroadc_model {
  69         RCAR_GYROADC_MODEL_DEFAULT,
  70         RCAR_GYROADC_MODEL_R8A7792,
  71 };
  72
  73 struct rcar_gyroadc {
  74         struct device                   *dev;
  75         void __iomem                    *regs;
  76         struct clk                      *clk;
  77         struct regulator                *vref[8];
  78         unsigned int                    num_channels;
  79         enum rcar_gyroadc_model         model;
  80         unsigned int                    mode;
  81         unsigned int                    sample_width;
  82 };
  83
  84 static void rcar_gyroadc_hw_init(struct rcar_gyroadc *priv)
  85 {
  86         const unsigned long clk_mhz = clk_get_rate(priv->clk) / 1000000;
  87         const unsigned long clk_mul =
  88                 (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5;
  89         unsigned long clk_len = clk_mhz * clk_mul;
  90
  91         /*
  92          * According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014,
  93          * page 77-7, clock length must be even number. If it's odd number,
  94          * add one.
  95          */
  96         if (clk_len & 1)
  97                 clk_len++;
  98
  99         /* Stop the GyroADC. */
 100         writel(0, priv->regs + RCAR_GYROADC_START_STOP);
 101
 102         /* Disable IRQ on V2H. */
 103         if (priv->model == RCAR_GYROADC_MODEL_R8A7792)
 104                 writel(0, priv->regs + RCAR_GYROADC_INTENR);
 105
 106         /* Set mode and timing. */
 107         writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT);
 108         writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH);
 109         writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH);
 110 }
 111
 112 static void rcar_gyroadc_hw_start(struct rcar_gyroadc *priv)
 113 {
 114         /* Start sampling. */
 115         writel(RCAR_GYROADC_START_STOP_START,
 116                priv->regs + RCAR_GYROADC_START_STOP);
 117
 118         /*
 119          * Wait for the first conversion to complete. This is longer than
 120          * the 1.25 mS in the datasheet because 1.25 mS is not enough for
 121          * the hardware to deliver the first sample and the hardware does
 122          * then return zeroes instead of valid data.
 123          */
 124         mdelay(3);
 125 }
 126
 127 static void rcar_gyroadc_hw_stop(struct rcar_gyroadc *priv)
 128 {
 129         /* Stop the GyroADC. */
 130         writel(0, priv->regs + RCAR_GYROADC_START_STOP);
 131 }
 132
 133 #define RCAR_GYROADC_CHAN(_idx) {                               \
 134         .type                   = IIO_VOLTAGE,                  \
 135         .indexed                = 1,                            \
 136         .channel                = (_idx),                       \
 137         .info_mask_separate     = BIT(IIO_CHAN_INFO_RAW) |      \
 138                                   BIT(IIO_CHAN_INFO_SCALE),     \
 139         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
 140 }
 141
 142 static const struct iio_chan_spec rcar_gyroadc_iio_channels_1[] = {
 143         RCAR_GYROADC_CHAN(0),
 144         RCAR_GYROADC_CHAN(1),
 145         RCAR_GYROADC_CHAN(2),
 146         RCAR_GYROADC_CHAN(3),
 147 };
 148
 149 static const struct iio_chan_spec rcar_gyroadc_iio_channels_2[] = {
 150         RCAR_GYROADC_CHAN(0),
 151         RCAR_GYROADC_CHAN(1),
 152         RCAR_GYROADC_CHAN(2),
 153         RCAR_GYROADC_CHAN(3),
 154         RCAR_GYROADC_CHAN(4),
 155         RCAR_GYROADC_CHAN(5),
 156         RCAR_GYROADC_CHAN(6),
 157         RCAR_GYROADC_CHAN(7),
 158 };
 159
 160 static const struct iio_chan_spec rcar_gyroadc_iio_channels_3[] = {
 161         RCAR_GYROADC_CHAN(0),
 162         RCAR_GYROADC_CHAN(1),
 163         RCAR_GYROADC_CHAN(2),
 164         RCAR_GYROADC_CHAN(3),
 165         RCAR_GYROADC_CHAN(4),
 166         RCAR_GYROADC_CHAN(5),
 167         RCAR_GYROADC_CHAN(6),
 168         RCAR_GYROADC_CHAN(7),
 169 };
 170
 171 static int rcar_gyroadc_set_power(struct rcar_gyroadc *priv, bool on)
 172 {
 173         struct device *dev = priv->dev;
 174         int ret;
 175
 176         if (on) {
 177                 ret = pm_runtime_get_sync(dev);
 178                 if (ret < 0)
 179                         pm_runtime_put_noidle(dev);
 180         } else {
 181                 pm_runtime_mark_last_busy(dev);
 182                 ret = pm_runtime_put_autosuspend(dev);
 183         }
 184
 185         return ret;
 186 }
 187
 188 static int rcar_gyroadc_read_raw(struct iio_dev *indio_dev,
 189                                  struct iio_chan_spec const *chan,
 190                                  int *val, int *val2, long mask)
 191 {
 192         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 193         struct regulator *consumer;
 194         unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel);
 195         unsigned int vref;
 196         int ret;
 197
 198         /*
 199          * MB88101 is special in that it has only single regulator for
 200          * all four channels.
 201          */
 202         if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A)
 203                 consumer = priv->vref[0];
 204         else
 205                 consumer = priv->vref[chan->channel];
 206
 207         switch (mask) {
 208         case IIO_CHAN_INFO_RAW:
 209                 if (chan->type != IIO_VOLTAGE)
 210                         return -EINVAL;
 211
 212                 /* Channel not connected. */
 213                 if (!consumer)
 214                         return -EINVAL;
 215
 216                 ret = iio_device_claim_direct_mode(indio_dev);
 217                 if (ret)
 218                         return ret;
 219
 220                 ret = rcar_gyroadc_set_power(priv, true);
 221                 if (ret < 0) {
 222                         iio_device_release_direct_mode(indio_dev);
 223                         return ret;
 224                 }
 225
 226                 *val = readl(priv->regs + datareg);
 227                 *val &= BIT(priv->sample_width) - 1;
 228
 229                 ret = rcar_gyroadc_set_power(priv, false);
 230                 iio_device_release_direct_mode(indio_dev);
 231                 if (ret < 0)
 232                         return ret;
 233
 234                 return IIO_VAL_INT;
 235         case IIO_CHAN_INFO_SCALE:
 236                 /* Channel not connected. */
 237                 if (!consumer)
 238                         return -EINVAL;
 239
 240                 vref = regulator_get_voltage(consumer);
 241                 *val = vref / 1000;
 242                 *val2 = 1 << priv->sample_width;
 243
 244                 return IIO_VAL_FRACTIONAL;
 245         case IIO_CHAN_INFO_SAMP_FREQ:
 246                 *val = RCAR_GYROADC_SAMPLE_RATE;
 247
 248                 return IIO_VAL_INT;
 249         default:
 250                 return -EINVAL;
 251         }
 252 }
 253
 254 static int rcar_gyroadc_reg_access(struct iio_dev *indio_dev,
 255                                    unsigned int reg, unsigned int writeval,
 256                                    unsigned int *readval)
 257 {
 258         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 259         unsigned int maxreg = RCAR_GYROADC_FIFO_STATUS;
 260
 261         if (readval == NULL)
 262                 return -EINVAL;
 263
 264         if (reg % 4)
 265                 return -EINVAL;
 266
 267         /* Handle the V2H case with extra interrupt block. */
 268         if (priv->model == RCAR_GYROADC_MODEL_R8A7792)
 269                 maxreg = RCAR_GYROADC_INTENR;
 270
 271         if (reg > maxreg)
 272                 return -EINVAL;
 273
 274         *readval = readl(priv->regs + reg);
 275
 276         return 0;
 277 }
 278
 279 static const struct iio_info rcar_gyroadc_iio_info = {
 280         .read_raw               = rcar_gyroadc_read_raw,
 281         .debugfs_reg_access     = rcar_gyroadc_reg_access,
 282 };
 283
 284 static const struct of_device_id rcar_gyroadc_match[] = {
 285         {
 286                 /* R-Car compatible GyroADC */
 287                 .compatible     = "renesas,rcar-gyroadc",
 288                 .data           = (void *)RCAR_GYROADC_MODEL_DEFAULT,
 289         }, {
 290                 /* R-Car V2H specialty with interrupt registers. */
 291                 .compatible     = "renesas,r8a7792-gyroadc",
 292                 .data           = (void *)RCAR_GYROADC_MODEL_R8A7792,
 293         }, {
 294                 /* sentinel */
 295         }
 296 };
 297
 298 MODULE_DEVICE_TABLE(of, rcar_gyroadc_match);
 299
 300 static const struct of_device_id rcar_gyroadc_child_match[] = {
 301         /* Mode 1 ADCs */
 302         {
 303                 .compatible     = "fujitsu,mb88101a",
 304                 .data           = (void *)RCAR_GYROADC_MODE_SELECT_1_MB88101A,
 305         },
 306         /* Mode 2 ADCs */
 307         {
 308                 .compatible     = "ti,adcs7476",
 309                 .data           = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476,
 310         }, {
 311                 .compatible     = "ti,adc121",
 312                 .data           = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476,
 313         }, {
 314                 .compatible     = "adi,ad7476",
 315                 .data           = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476,
 316         },
 317         /* Mode 3 ADCs */
 318         {
 319                 .compatible     = "maxim,max1162",
 320                 .data           = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162,
 321         }, {
 322                 .compatible     = "maxim,max11100",
 323                 .data           = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162,
 324         },
 325         { /* sentinel */ }
 326 };
 327
 328 static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
 329 {
 330         const struct of_device_id *of_id;
 331         const struct iio_chan_spec *channels;
 332         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 333         struct device *dev = priv->dev;
 334         struct device_node *np = dev->of_node;
 335         struct device_node *child;
 336         struct regulator *vref;
 337         unsigned int reg;
 338         unsigned int adcmode = -1, childmode;
 339         unsigned int sample_width;
 340         unsigned int num_channels;
 341         int ret, first = 1;
 342
 343         for_each_child_of_node(np, child) {
 344                 of_id = of_match_node(rcar_gyroadc_child_match, child);
 345                 if (!of_id) {
 346                         dev_err(dev, "Ignoring unsupported ADC \"%s\".",
 347                                 child->name);
 348                         continue;
 349                 }
 350
 351                 childmode = (uintptr_t)of_id->data;
 352                 switch (childmode) {
 353                 case RCAR_GYROADC_MODE_SELECT_1_MB88101A:
 354                         sample_width = 12;
 355                         channels = rcar_gyroadc_iio_channels_1;
 356                         num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_1);
 357                         break;
 358                 case RCAR_GYROADC_MODE_SELECT_2_ADCS7476:
 359                         sample_width = 15;
 360                         channels = rcar_gyroadc_iio_channels_2;
 361                         num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_2);
 362                         break;
 363                 case RCAR_GYROADC_MODE_SELECT_3_MAX1162:
 364                         sample_width = 16;
 365                         channels = rcar_gyroadc_iio_channels_3;
 366                         num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3);
 367                         break;
 368                 default:
 369                         return -EINVAL;
 370                 }
 371
 372                 /*
 373                  * MB88101 is special in that it's only a single chip taking
 374                  * up all the CHS lines. Thus, the DT binding is also special
 375                  * and has no reg property. If we run into such ADC, handle
 376                  * it here.
 377                  */
 378                 if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) {
 379                         reg = 0;
 380                 } else {
 381                         ret = of_property_read_u32(child, "reg", &reg);
 382                         if (ret) {
 383                                 dev_err(dev,
 384                                         "Failed to get child reg property of ADC \"%s\".\n",
 385                                         child->name);
 386                                 return ret;
 387                         }
 388
 389                         /* Channel number is too high. */
 390                         if (reg >= num_channels) {
 391                                 dev_err(dev,
 392                                         "Only %i channels supported with %s, but reg = <%i>.\n",
 393                                         num_channels, child->name, reg);
 394                                 return ret;
 395                         }
 396                 }
 397
 398                 /* Child node selected different mode than the rest. */
 399                 if (!first && (adcmode != childmode)) {
 400                         dev_err(dev,
 401                                 "Channel %i uses different ADC mode than the rest.\n",
 402                                 reg);
 403                         return ret;
 404                 }
 405
 406                 /* Channel is valid, grab the regulator. */
 407                 dev->of_node = child;
 408                 vref = devm_regulator_get(dev, "vref");
 409                 dev->of_node = np;
 410                 if (IS_ERR(vref)) {
 411                         dev_dbg(dev, "Channel %i 'vref' supply not connected.\n",
 412                                 reg);
 413                         return PTR_ERR(vref);
 414                 }
 415
 416                 priv->vref[reg] = vref;
 417
 418                 if (!first)
 419                         continue;
 420
 421                 /* First child node which passed sanity tests. */
 422                 adcmode = childmode;
 423                 first = 0;
 424
 425                 priv->num_channels = num_channels;
 426                 priv->mode = childmode;
 427                 priv->sample_width = sample_width;
 428
 429                 indio_dev->channels = channels;
 430                 indio_dev->num_channels = num_channels;
 431
 432                 /*
 433                  * MB88101 is special and we only have one such device
 434                  * attached to the GyroADC at a time, so if we found it,
 435                  * we can stop parsing here.
 436                  */
 437                 if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A)
 438                         break;
 439         }
 440
 441         if (first) {
 442                 dev_err(dev, "No valid ADC channels found, aborting.\n");
 443                 return -EINVAL;
 444         }
 445
 446         return 0;
 447 }
 448
 449 static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev)
 450 {
 451         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 452         unsigned int i;
 453
 454         for (i = 0; i < priv->num_channels; i++) {
 455                 if (!priv->vref[i])
 456                         continue;
 457
 458                 regulator_disable(priv->vref[i]);
 459         }
 460 }
 461
 462 static int rcar_gyroadc_init_supplies(struct iio_dev *indio_dev)
 463 {
 464         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 465         struct device *dev = priv->dev;
 466         unsigned int i;
 467         int ret;
 468
 469         for (i = 0; i < priv->num_channels; i++) {
 470                 if (!priv->vref[i])
 471                         continue;
 472
 473                 ret = regulator_enable(priv->vref[i]);
 474                 if (ret) {
 475                         dev_err(dev, "Failed to enable regulator %i (ret=%i)\n",
 476                                 i, ret);
 477                         goto err;
 478                 }
 479         }
 480
 481         return 0;
 482
 483 err:
 484         rcar_gyroadc_deinit_supplies(indio_dev);
 485         return ret;
 486 }
 487
 488 static int rcar_gyroadc_probe(struct platform_device *pdev)
 489 {
 490         struct device *dev = &pdev->dev;
 491         struct rcar_gyroadc *priv;
 492         struct iio_dev *indio_dev;
 493         struct resource *mem;
 494         int ret;
 495
 496         indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
 497         if (!indio_dev) {
 498                 dev_err(dev, "Failed to allocate IIO device.\n");
 499                 return -ENOMEM;
 500         }
 501
 502         priv = iio_priv(indio_dev);
 503         priv->dev = dev;
 504
 505         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 506         priv->regs = devm_ioremap_resource(dev, mem);
 507         if (IS_ERR(priv->regs))
 508                 return PTR_ERR(priv->regs);
 509
 510         priv->clk = devm_clk_get(dev, "fck");
 511         if (IS_ERR(priv->clk)) {
 512                 ret = PTR_ERR(priv->clk);
 513                 if (ret != -EPROBE_DEFER)
 514                         dev_err(dev, "Failed to get IF clock (ret=%i)\n", ret);
 515                 return ret;
 516         }
 517
 518         ret = rcar_gyroadc_parse_subdevs(indio_dev);
 519         if (ret)
 520                 return ret;
 521
 522         ret = rcar_gyroadc_init_supplies(indio_dev);
 523         if (ret)
 524                 return ret;
 525
 526         priv->model = (enum rcar_gyroadc_model)
 527                 of_device_get_match_data(&pdev->dev);
 528
 529         platform_set_drvdata(pdev, indio_dev);
 530
 531         indio_dev->name = DRIVER_NAME;
 532         indio_dev->dev.parent = dev;
 533         indio_dev->dev.of_node = pdev->dev.of_node;
 534         indio_dev->info = &rcar_gyroadc_iio_info;
 535         indio_dev->modes = INDIO_DIRECT_MODE;
 536
 537         ret = clk_prepare_enable(priv->clk);
 538         if (ret) {
 539                 dev_err(dev, "Could not prepare or enable the IF clock.\n");
 540                 goto err_clk_if_enable;
 541         }
 542
 543         pm_runtime_set_autosuspend_delay(dev, RCAR_GYROADC_RUNTIME_PM_DELAY_MS);
 544         pm_runtime_use_autosuspend(dev);
 545         pm_runtime_enable(dev);
 546
 547         pm_runtime_get_sync(dev);
 548         rcar_gyroadc_hw_init(priv);
 549         rcar_gyroadc_hw_start(priv);
 550
 551         ret = iio_device_register(indio_dev);
 552         if (ret) {
 553                 dev_err(dev, "Couldn't register IIO device.\n");
 554                 goto err_iio_device_register;
 555         }
 556
 557         pm_runtime_put_sync(dev);
 558
 559         return 0;
 560
 561 err_iio_device_register:
 562         rcar_gyroadc_hw_stop(priv);
 563         pm_runtime_put_sync(dev);
 564         pm_runtime_disable(dev);
 565         pm_runtime_set_suspended(dev);
 566         clk_disable_unprepare(priv->clk);
 567 err_clk_if_enable:
 568         rcar_gyroadc_deinit_supplies(indio_dev);
 569
 570         return ret;
 571 }
 572
 573 static int rcar_gyroadc_remove(struct platform_device *pdev)
 574 {
 575         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 576         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 577         struct device *dev = priv->dev;
 578
 579         iio_device_unregister(indio_dev);
 580         pm_runtime_get_sync(dev);
 581         rcar_gyroadc_hw_stop(priv);
 582         pm_runtime_put_sync(dev);
 583         pm_runtime_disable(dev);
 584         pm_runtime_set_suspended(dev);
 585         clk_disable_unprepare(priv->clk);
 586         rcar_gyroadc_deinit_supplies(indio_dev);
 587
 588         return 0;
 589 }
 590
 591 #if defined(CONFIG_PM)
 592 static int rcar_gyroadc_suspend(struct device *dev)
 593 {
 594         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 595         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 596
 597         rcar_gyroadc_hw_stop(priv);
 598
 599         return 0;
 600 }
 601
 602 static int rcar_gyroadc_resume(struct device *dev)
 603 {
 604         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 605         struct rcar_gyroadc *priv = iio_priv(indio_dev);
 606
 607         rcar_gyroadc_hw_start(priv);
 608
 609         return 0;
 610 }
 611 #endif
 612
 613 static const struct dev_pm_ops rcar_gyroadc_pm_ops = {
 614         SET_RUNTIME_PM_OPS(rcar_gyroadc_suspend, rcar_gyroadc_resume, NULL)
 615 };
 616
 617 static struct platform_driver rcar_gyroadc_driver = {
 618         .probe          = rcar_gyroadc_probe,
 619         .remove         = rcar_gyroadc_remove,
 620         .driver         = {
 621                 .name           = DRIVER_NAME,
 622                 .of_match_table = rcar_gyroadc_match,
 623                 .pm             = &rcar_gyroadc_pm_ops,
 624         },
 625 };
 626
 627 module_platform_driver(rcar_gyroadc_driver);
 628
 629 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 630 MODULE_DESCRIPTION("Renesas R-Car GyroADC driver");
 631 MODULE_LICENSE("GPL");