drivers/rtc/rtc-bd70528.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 //
   3 // Copyright (C) 2018 ROHM Semiconductors
   4 //
   5 // RTC driver for ROHM BD70528 PMIC
   6
   7 #include <linux/bcd.h>
   8 #include <linux/mfd/rohm-bd70528.h>
   9 #include <linux/mfd/rohm-bd71828.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14 #include <linux/rtc.h>
  15
  16 /*
  17  * We read regs RTC_SEC => RTC_YEAR
  18  * this struct is ordered according to chip registers.
  19  * Keep it u8 only (or packed) to avoid padding issues.
  20  */
  21 struct bd70528_rtc_day {
  22         u8 sec;
  23         u8 min;
  24         u8 hour;
  25 } __packed;
  26
  27 struct bd70528_rtc_data {
  28         struct bd70528_rtc_day time;
  29         u8 week;
  30         u8 day;
  31         u8 month;
  32         u8 year;
  33 } __packed;
  34
  35 struct bd70528_rtc_wake {
  36         struct bd70528_rtc_day time;
  37         u8 ctrl;
  38 } __packed;
  39
  40 struct bd71828_rtc_alm {
  41         struct bd70528_rtc_data alm0;
  42         struct bd70528_rtc_data alm1;
  43         u8 alm_mask;
  44         u8 alm1_mask;
  45 } __packed;
  46
  47 struct bd70528_rtc_alm {
  48         struct bd70528_rtc_data data;
  49         u8 alm_mask;
  50         u8 alm_repeat;
  51 } __packed;
  52
  53 struct bd70528_rtc {
  54         struct rohm_regmap_dev *parent;
  55         struct device *dev;
  56         u8 reg_time_start;
  57         bool has_rtc_timers;
  58 };
  59
  60 static int bd70528_set_wake(struct rohm_regmap_dev *bd70528,
  61                             int enable, int *old_state)
  62 {
  63         int ret;
  64         unsigned int ctrl_reg;
  65
  66         ret = regmap_read(bd70528->regmap, BD70528_REG_WAKE_EN, &ctrl_reg);
  67         if (ret)
  68                 return ret;
  69
  70         if (old_state) {
  71                 if (ctrl_reg & BD70528_MASK_WAKE_EN)
  72                         *old_state |= BD70528_WAKE_STATE_BIT;
  73                 else
  74                         *old_state &= ~BD70528_WAKE_STATE_BIT;
  75
  76                 if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT))
  77                         return 0;
  78         }
  79
  80         if (enable)
  81                 ctrl_reg |= BD70528_MASK_WAKE_EN;
  82         else
  83                 ctrl_reg &= ~BD70528_MASK_WAKE_EN;
  84
  85         return regmap_write(bd70528->regmap, BD70528_REG_WAKE_EN,
  86                             ctrl_reg);
  87 }
  88
  89 static int bd70528_set_elapsed_tmr(struct rohm_regmap_dev *bd70528,
  90                                    int enable, int *old_state)
  91 {
  92         int ret;
  93         unsigned int ctrl_reg;
  94
  95         /*
  96          * TBD
  97          * What is the purpose of elapsed timer ?
  98          * Is the timeout registers counting down, or is the disable - re-enable
  99          * going to restart the elapsed-time counting? If counting is restarted
 100          * the timeout should be decreased by the amount of time that has
 101          * elapsed since starting the timer. Maybe we should store the monotonic
 102          * clock value when timer is started so that if RTC is set while timer
 103          * is armed we could do the compensation. This is a hack if RTC/system
 104          * clk are drifting. OTOH, RTC controlled via I2C is in any case
 105          * inaccurate...
 106          */
 107         ret = regmap_read(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
 108                           &ctrl_reg);
 109         if (ret)
 110                 return ret;
 111
 112         if (old_state) {
 113                 if (ctrl_reg & BD70528_MASK_ELAPSED_TIMER_EN)
 114                         *old_state |= BD70528_ELAPSED_STATE_BIT;
 115                 else
 116                         *old_state &= ~BD70528_ELAPSED_STATE_BIT;
 117
 118                 if ((!enable) == (!(*old_state & BD70528_ELAPSED_STATE_BIT)))
 119                         return 0;
 120         }
 121
 122         if (enable)
 123                 ctrl_reg |= BD70528_MASK_ELAPSED_TIMER_EN;
 124         else
 125                 ctrl_reg &= ~BD70528_MASK_ELAPSED_TIMER_EN;
 126
 127         return regmap_write(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
 128                             ctrl_reg);
 129 }
 130
 131 static int bd70528_set_rtc_based_timers(struct bd70528_rtc *r, int new_state,
 132                                         int *old_state)
 133 {
 134         int ret;
 135
 136         ret = bd70528_wdt_set(r->parent, new_state & BD70528_WDT_STATE_BIT,
 137                               old_state);
 138         if (ret) {
 139                 dev_err(r->dev,
 140                         "Failed to disable WDG for RTC setting (%d)\n", ret);
 141                 return ret;
 142         }
 143         ret = bd70528_set_elapsed_tmr(r->parent,
 144                                       new_state & BD70528_ELAPSED_STATE_BIT,
 145                                       old_state);
 146         if (ret) {
 147                 dev_err(r->dev,
 148                         "Failed to disable 'elapsed timer' for RTC setting\n");
 149                 return ret;
 150         }
 151         ret = bd70528_set_wake(r->parent, new_state & BD70528_WAKE_STATE_BIT,
 152                                old_state);
 153         if (ret) {
 154                 dev_err(r->dev,
 155                         "Failed to disable 'wake timer' for RTC setting\n");
 156                 return ret;
 157         }
 158
 159         return ret;
 160 }
 161
 162 static int bd70528_re_enable_rtc_based_timers(struct bd70528_rtc *r,
 163                                               int old_state)
 164 {
 165         if (!r->has_rtc_timers)
 166                 return 0;
 167
 168         return bd70528_set_rtc_based_timers(r, old_state, NULL);
 169 }
 170
 171 static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r,
 172                                             int *old_state)
 173 {
 174         if (!r->has_rtc_timers)
 175                 return 0;
 176
 177         return bd70528_set_rtc_based_timers(r, 0, old_state);
 178 }
 179
 180 static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d)
 181 {
 182         d->sec &= ~BD70528_MASK_RTC_SEC;
 183         d->min &= ~BD70528_MASK_RTC_MINUTE;
 184         d->hour &= ~BD70528_MASK_RTC_HOUR;
 185         d->sec |= bin2bcd(t->tm_sec);
 186         d->min |= bin2bcd(t->tm_min);
 187         d->hour |= bin2bcd(t->tm_hour);
 188 }
 189
 190 static inline void tm2rtc(struct rtc_time *t, struct bd70528_rtc_data *r)
 191 {
 192         r->day &= ~BD70528_MASK_RTC_DAY;
 193         r->week &= ~BD70528_MASK_RTC_WEEK;
 194         r->month &= ~BD70528_MASK_RTC_MONTH;
 195         /*
 196          * PM and 24H bits are not used by Wake - thus we clear them
 197          * here and not in tmday2rtc() which is also used by wake.
 198          */
 199         r->time.hour &= ~(BD70528_MASK_RTC_HOUR_PM | BD70528_MASK_RTC_HOUR_24H);
 200
 201         tmday2rtc(t, &r->time);
 202         /*
 203          * We do always set time in 24H mode.
 204          */
 205         r->time.hour |= BD70528_MASK_RTC_HOUR_24H;
 206         r->day |= bin2bcd(t->tm_mday);
 207         r->week |= bin2bcd(t->tm_wday);
 208         r->month |= bin2bcd(t->tm_mon + 1);
 209         r->year = bin2bcd(t->tm_year - 100);
 210 }
 211
 212 static inline void rtc2tm(struct bd70528_rtc_data *r, struct rtc_time *t)
 213 {
 214         t->tm_sec = bcd2bin(r->time.sec & BD70528_MASK_RTC_SEC);
 215         t->tm_min = bcd2bin(r->time.min & BD70528_MASK_RTC_MINUTE);
 216         t->tm_hour = bcd2bin(r->time.hour & BD70528_MASK_RTC_HOUR);
 217         /*
 218          * If RTC is in 12H mode, then bit BD70528_MASK_RTC_HOUR_PM
 219          * is not BCD value but tells whether it is AM or PM
 220          */
 221         if (!(r->time.hour & BD70528_MASK_RTC_HOUR_24H)) {
 222                 t->tm_hour %= 12;
 223                 if (r->time.hour & BD70528_MASK_RTC_HOUR_PM)
 224                         t->tm_hour += 12;
 225         }
 226         t->tm_mday = bcd2bin(r->day & BD70528_MASK_RTC_DAY);
 227         t->tm_mon = bcd2bin(r->month & BD70528_MASK_RTC_MONTH) - 1;
 228         t->tm_year = 100 + bcd2bin(r->year & BD70528_MASK_RTC_YEAR);
 229         t->tm_wday = bcd2bin(r->week & BD70528_MASK_RTC_WEEK);
 230 }
 231
 232 static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
 233 {
 234         int ret;
 235         struct bd71828_rtc_alm alm;
 236         struct bd70528_rtc *r = dev_get_drvdata(dev);
 237         struct rohm_regmap_dev *parent = r->parent;
 238
 239         ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START,
 240                                &alm, sizeof(alm));
 241         if (ret) {
 242                 dev_err(dev, "Failed to read alarm regs\n");
 243                 return ret;
 244         }
 245
 246         tm2rtc(&a->time, &alm.alm0);
 247
 248         if (!a->enabled)
 249                 alm.alm_mask &= ~BD70528_MASK_ALM_EN;
 250         else
 251                 alm.alm_mask |= BD70528_MASK_ALM_EN;
 252
 253         ret = regmap_bulk_write(parent->regmap, BD71828_REG_RTC_ALM_START,
 254                                 &alm, sizeof(alm));
 255         if (ret)
 256                 dev_err(dev, "Failed to set alarm time\n");
 257
 258         return ret;
 259
 260 }
 261
 262 static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
 263 {
 264         struct bd70528_rtc_wake wake;
 265         struct bd70528_rtc_alm alm;
 266         int ret;
 267         struct bd70528_rtc *r = dev_get_drvdata(dev);
 268         struct rohm_regmap_dev *parent = r->parent;
 269
 270         ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_WAKE_START,
 271                                &wake, sizeof(wake));
 272         if (ret) {
 273                 dev_err(dev, "Failed to read wake regs\n");
 274                 return ret;
 275         }
 276
 277         ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START,
 278                                &alm, sizeof(alm));
 279         if (ret) {
 280                 dev_err(dev, "Failed to read alarm regs\n");
 281                 return ret;
 282         }
 283
 284         tm2rtc(&a->time, &alm.data);
 285         tmday2rtc(&a->time, &wake.time);
 286
 287         if (a->enabled) {
 288                 alm.alm_mask &= ~BD70528_MASK_ALM_EN;
 289                 wake.ctrl |= BD70528_MASK_WAKE_EN;
 290         } else {
 291                 alm.alm_mask |= BD70528_MASK_ALM_EN;
 292                 wake.ctrl &= ~BD70528_MASK_WAKE_EN;
 293         }
 294
 295         ret = regmap_bulk_write(parent->regmap,
 296                                 BD70528_REG_RTC_WAKE_START, &wake,
 297                                 sizeof(wake));
 298         if (ret) {
 299                 dev_err(dev, "Failed to set wake time\n");
 300                 return ret;
 301         }
 302         ret = regmap_bulk_write(parent->regmap, BD70528_REG_RTC_ALM_START,
 303                                 &alm, sizeof(alm));
 304         if (ret)
 305                 dev_err(dev, "Failed to set alarm time\n");
 306
 307         return ret;
 308 }
 309
 310 static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
 311 {
 312         int ret;
 313         struct bd71828_rtc_alm alm;
 314         struct bd70528_rtc *r = dev_get_drvdata(dev);
 315         struct rohm_regmap_dev *parent = r->parent;
 316
 317         ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START,
 318                                &alm, sizeof(alm));
 319         if (ret) {
 320                 dev_err(dev, "Failed to read alarm regs\n");
 321                 return ret;
 322         }
 323
 324         rtc2tm(&alm.alm0, &a->time);
 325         a->time.tm_mday = -1;
 326         a->time.tm_mon = -1;
 327         a->time.tm_year = -1;
 328         a->enabled = !!(alm.alm_mask & BD70528_MASK_ALM_EN);
 329         a->pending = 0;
 330
 331         return 0;
 332 }
 333
 334 static int bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a)
 335 {
 336         struct bd70528_rtc_alm alm;
 337         int ret;
 338         struct bd70528_rtc *r = dev_get_drvdata(dev);
 339         struct rohm_regmap_dev *parent = r->parent;
 340
 341         ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START,
 342                                &alm, sizeof(alm));
 343         if (ret) {
 344                 dev_err(dev, "Failed to read alarm regs\n");
 345                 return ret;
 346         }
 347
 348         rtc2tm(&alm.data, &a->time);
 349         a->time.tm_mday = -1;
 350         a->time.tm_mon = -1;
 351         a->time.tm_year = -1;
 352         a->enabled = !(alm.alm_mask & BD70528_MASK_ALM_EN);
 353         a->pending = 0;
 354
 355         return 0;
 356 }
 357
 358 static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
 359 {
 360         int ret, tmpret, old_states;
 361         struct bd70528_rtc_data rtc_data;
 362         struct bd70528_rtc *r = dev_get_drvdata(dev);
 363         struct rohm_regmap_dev *parent = r->parent;
 364
 365         ret = bd70528_disable_rtc_based_timers(r, &old_states);
 366         if (ret)
 367                 return ret;
 368
 369         tmpret = regmap_bulk_read(parent->regmap,
 370                                   r->reg_time_start, &rtc_data,
 371                                   sizeof(rtc_data));
 372         if (tmpret) {
 373                 dev_err(dev, "Failed to read RTC time registers\n");
 374                 goto renable_out;
 375         }
 376         tm2rtc(t, &rtc_data);
 377
 378         tmpret = regmap_bulk_write(parent->regmap,
 379                                    r->reg_time_start, &rtc_data,
 380                                    sizeof(rtc_data));
 381         if (tmpret) {
 382                 dev_err(dev, "Failed to set RTC time\n");
 383                 goto renable_out;
 384         }
 385
 386 renable_out:
 387         ret = bd70528_re_enable_rtc_based_timers(r, old_states);
 388         if (tmpret)
 389                 ret = tmpret;
 390
 391         return ret;
 392 }
 393
 394 static int bd71828_set_time(struct device *dev, struct rtc_time *t)
 395 {
 396         return bd70528_set_time_locked(dev, t);
 397 }
 398
 399 static int bd70528_set_time(struct device *dev, struct rtc_time *t)
 400 {
 401         int ret;
 402         struct bd70528_rtc *r = dev_get_drvdata(dev);
 403
 404         bd70528_wdt_lock(r->parent);
 405         ret = bd70528_set_time_locked(dev, t);
 406         bd70528_wdt_unlock(r->parent);
 407         return ret;
 408 }
 409
 410 static int bd70528_get_time(struct device *dev, struct rtc_time *t)
 411 {
 412         struct bd70528_rtc *r = dev_get_drvdata(dev);
 413         struct rohm_regmap_dev *parent = r->parent;
 414         struct bd70528_rtc_data rtc_data;
 415         int ret;
 416
 417         /* read the RTC date and time registers all at once */
 418         ret = regmap_bulk_read(parent->regmap,
 419                                r->reg_time_start, &rtc_data,
 420                                sizeof(rtc_data));
 421         if (ret) {
 422                 dev_err(dev, "Failed to read RTC time (err %d)\n", ret);
 423                 return ret;
 424         }
 425
 426         rtc2tm(&rtc_data, t);
 427
 428         return 0;
 429 }
 430
 431 static int bd70528_alm_enable(struct device *dev, unsigned int enabled)
 432 {
 433         int ret;
 434         unsigned int enableval = BD70528_MASK_ALM_EN;
 435         struct bd70528_rtc *r = dev_get_drvdata(dev);
 436
 437         if (enabled)
 438                 enableval = 0;
 439
 440         bd70528_wdt_lock(r->parent);
 441         ret = bd70528_set_wake(r->parent, enabled, NULL);
 442         if (ret) {
 443                 dev_err(dev, "Failed to change wake state\n");
 444                 goto out_unlock;
 445         }
 446         ret = regmap_update_bits(r->parent->regmap, BD70528_REG_RTC_ALM_MASK,
 447                                  BD70528_MASK_ALM_EN, enableval);
 448         if (ret)
 449                 dev_err(dev, "Failed to change alarm state\n");
 450
 451 out_unlock:
 452         bd70528_wdt_unlock(r->parent);
 453         return ret;
 454 }
 455
 456 static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
 457 {
 458         int ret;
 459         struct bd70528_rtc *r = dev_get_drvdata(dev);
 460         unsigned int enableval = BD70528_MASK_ALM_EN;
 461
 462         if (!enabled)
 463                 enableval = 0;
 464
 465         ret = regmap_update_bits(r->parent->regmap, BD71828_REG_RTC_ALM0_MASK,
 466                                  BD70528_MASK_ALM_EN, enableval);
 467         if (ret)
 468                 dev_err(dev, "Failed to change alarm state\n");
 469
 470         return ret;
 471 }
 472
 473 static const struct rtc_class_ops bd70528_rtc_ops = {
 474         .read_time              = bd70528_get_time,
 475         .set_time               = bd70528_set_time,
 476         .read_alarm             = bd70528_read_alarm,
 477         .set_alarm              = bd70528_set_alarm,
 478         .alarm_irq_enable       = bd70528_alm_enable,
 479 };
 480
 481 static const struct rtc_class_ops bd71828_rtc_ops = {
 482         .read_time              = bd70528_get_time,
 483         .set_time               = bd71828_set_time,
 484         .read_alarm             = bd71828_read_alarm,
 485         .set_alarm              = bd71828_set_alarm,
 486         .alarm_irq_enable       = bd71828_alm_enable,
 487 };
 488
 489 static irqreturn_t alm_hndlr(int irq, void *data)
 490 {
 491         struct rtc_device *rtc = data;
 492
 493         rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF | RTC_PF);
 494         return IRQ_HANDLED;
 495 }
 496
 497 static int bd70528_probe(struct platform_device *pdev)
 498 {
 499         struct bd70528_rtc *bd_rtc;
 500         const struct rtc_class_ops *rtc_ops;
 501         struct rohm_regmap_dev *parent;
 502         const char *irq_name;
 503         int ret;
 504         struct rtc_device *rtc;
 505         int irq;
 506         unsigned int hr;
 507         bool enable_main_irq = false;
 508         u8 hour_reg;
 509         enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
 510
 511         parent = dev_get_drvdata(pdev->dev.parent);
 512         if (!parent) {
 513                 dev_err(&pdev->dev, "No MFD driver data\n");
 514                 return -EINVAL;
 515         }
 516         bd_rtc = devm_kzalloc(&pdev->dev, sizeof(*bd_rtc), GFP_KERNEL);
 517         if (!bd_rtc)
 518                 return -ENOMEM;
 519
 520         bd_rtc->parent = parent;
 521         bd_rtc->dev = &pdev->dev;
 522
 523         switch (chip) {
 524         case ROHM_CHIP_TYPE_BD70528:
 525                 irq_name = "bd70528-rtc-alm";
 526                 bd_rtc->has_rtc_timers = true;
 527                 bd_rtc->reg_time_start = BD70528_REG_RTC_START;
 528                 hour_reg = BD70528_REG_RTC_HOUR;
 529                 enable_main_irq = true;
 530                 rtc_ops = &bd70528_rtc_ops;
 531                 break;
 532         case ROHM_CHIP_TYPE_BD71828:
 533                 irq_name = "bd71828-rtc-alm-0";
 534                 bd_rtc->reg_time_start = BD71828_REG_RTC_START;
 535                 hour_reg = BD71828_REG_RTC_HOUR;
 536                 rtc_ops = &bd71828_rtc_ops;
 537                 break;
 538         default:
 539                 dev_err(&pdev->dev, "Unknown chip\n");
 540                 return -ENOENT;
 541         }
 542
 543         irq = platform_get_irq_byname(pdev, irq_name);
 544
 545         if (irq < 0)
 546                 return irq;
 547
 548         platform_set_drvdata(pdev, bd_rtc);
 549
 550         ret = regmap_read(parent->regmap, hour_reg, &hr);
 551
 552         if (ret) {
 553                 dev_err(&pdev->dev, "Failed to reag RTC clock\n");
 554                 return ret;
 555         }
 556
 557         if (!(hr & BD70528_MASK_RTC_HOUR_24H)) {
 558                 struct rtc_time t;
 559
 560                 ret = rtc_ops->read_time(&pdev->dev, &t);
 561
 562                 if (!ret)
 563                         ret = rtc_ops->set_time(&pdev->dev, &t);
 564
 565                 if (ret) {
 566                         dev_err(&pdev->dev,
 567                                 "Setting 24H clock for RTC failed\n");
 568                         return ret;
 569                 }
 570         }
 571
 572         device_set_wakeup_capable(&pdev->dev, true);
 573         device_wakeup_enable(&pdev->dev);
 574
 575         rtc = devm_rtc_allocate_device(&pdev->dev);
 576         if (IS_ERR(rtc)) {
 577                 dev_err(&pdev->dev, "RTC device creation failed\n");
 578                 return PTR_ERR(rtc);
 579         }
 580
 581         rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 582         rtc->range_max = RTC_TIMESTAMP_END_2099;
 583         rtc->ops = rtc_ops;
 584
 585         /* Request alarm IRQ prior to registerig the RTC */
 586         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, &alm_hndlr,
 587                                         IRQF_ONESHOT, "bd70528-rtc", rtc);
 588         if (ret)
 589                 return ret;
 590
 591         /*
 592          *  BD70528 irq controller is not touching the main mask register.
 593          *  So enable the RTC block interrupts at main level. We can just
 594          *  leave them enabled as irq-controller should disable irqs
 595          *  from sub-registers when IRQ is disabled or freed.
 596          */
 597         if (enable_main_irq) {
 598                 ret = regmap_update_bits(parent->regmap,
 599                                  BD70528_REG_INT_MAIN_MASK,
 600                                  BD70528_INT_RTC_MASK, 0);
 601                 if (ret) {
 602                         dev_err(&pdev->dev, "Failed to enable RTC interrupts\n");
 603                         return ret;
 604                 }
 605         }
 606
 607         return rtc_register_device(rtc);
 608 }
 609
 610 static const struct platform_device_id bd718x7_rtc_id[] = {
 611         { "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 },
 612         { "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
 613         { },
 614 };
 615 MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);
 616
 617 static struct platform_driver bd70528_rtc = {
 618         .driver = {
 619                 .name = "bd70528-rtc"
 620         },
 621         .probe = bd70528_probe,
 622         .id_table = bd718x7_rtc_id,
 623 };
 624
 625 module_platform_driver(bd70528_rtc);
 626
 627 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
 628 MODULE_DESCRIPTION("ROHM BD70528 and BD71828 PMIC RTC driver");
 629 MODULE_LICENSE("GPL");
 630 MODULE_ALIAS("platform:bd70528-rtc");