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1// SPDX-License-Identifier: GPL-2.02/*3 * RTC driver for the Micro Crystal RV88034 *5 * Copyright (C) 2015 Micro Crystal SA6 * Alexandre Belloni <alexandre.belloni@bootlin.com>7 *8 */9 10#include <linux/bcd.h>11#include <linux/bitops.h>12#include <linux/bitfield.h>13#include <linux/log2.h>14#include <linux/i2c.h>15#include <linux/interrupt.h>16#include <linux/kernel.h>17#include <linux/module.h>18#include <linux/of.h>19#include <linux/rtc.h>20#include <linux/pm_wakeirq.h>21 22#define RV8803_I2C_TRY_COUNT 423 24#define RV8803_SEC 0x0025#define RV8803_MIN 0x0126#define RV8803_HOUR 0x0227#define RV8803_WEEK 0x0328#define RV8803_DAY 0x0429#define RV8803_MONTH 0x0530#define RV8803_YEAR 0x0631#define RV8803_RAM 0x0732#define RV8803_ALARM_MIN 0x0833#define RV8803_ALARM_HOUR 0x0934#define RV8803_ALARM_WEEK_OR_DAY 0x0A35#define RV8803_EXT 0x0D36#define RV8803_FLAG 0x0E37#define RV8803_CTRL 0x0F38#define RV8803_OSC_OFFSET 0x2C39 40#define RV8803_EXT_WADA BIT(6)41 42#define RV8803_FLAG_V1F BIT(0)43#define RV8803_FLAG_V2F BIT(1)44#define RV8803_FLAG_AF BIT(3)45#define RV8803_FLAG_TF BIT(4)46#define RV8803_FLAG_UF BIT(5)47 48#define RV8803_CTRL_RESET BIT(0)49 50#define RV8803_CTRL_EIE BIT(2)51#define RV8803_CTRL_AIE BIT(3)52#define RV8803_CTRL_TIE BIT(4)53#define RV8803_CTRL_UIE BIT(5)54 55#define RX8803_CTRL_CSEL GENMASK(7, 6)56 57#define RX8900_BACKUP_CTRL 0x1858#define RX8900_FLAG_SWOFF BIT(2)59#define RX8900_FLAG_VDETOFF BIT(3)60 61enum rv8803_type {62 rv_8803,63 rx_8803,64 rx_8804,65 rx_890066};67 68struct rv8803_data {69 struct i2c_client *client;70 struct rtc_device *rtc;71 struct mutex flags_lock;72 u8 ctrl;73 u8 backup;74 u8 alarm_invalid:1;75 enum rv8803_type type;76};77 78static int rv8803_read_reg(const struct i2c_client *client, u8 reg)79{80 int try = RV8803_I2C_TRY_COUNT;81 s32 ret;82 83 /*84 * There is a 61µs window during which the RTC does not acknowledge I2C85 * transfers. In that case, ensure that there are multiple attempts.86 */87 do88 ret = i2c_smbus_read_byte_data(client, reg);89 while ((ret == -ENXIO || ret == -EIO) && --try);90 if (ret < 0)91 dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);92 93 return ret;94}95 96static int rv8803_read_regs(const struct i2c_client *client,97 u8 reg, u8 count, u8 *values)98{99 int try = RV8803_I2C_TRY_COUNT;100 s32 ret;101 102 do103 ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);104 while ((ret == -ENXIO || ret == -EIO) && --try);105 if (ret != count) {106 dev_err(&client->dev,107 "Unable to read registers 0x%02x..0x%02x\n",108 reg, reg + count - 1);109 return ret < 0 ? ret : -EIO;110 }111 112 return 0;113}114 115static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)116{117 int try = RV8803_I2C_TRY_COUNT;118 s32 ret;119 120 do121 ret = i2c_smbus_write_byte_data(client, reg, value);122 while ((ret == -ENXIO || ret == -EIO) && --try);123 if (ret)124 dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);125 126 return ret;127}128 129static int rv8803_write_regs(const struct i2c_client *client,130 u8 reg, u8 count, const u8 *values)131{132 int try = RV8803_I2C_TRY_COUNT;133 s32 ret;134 135 do136 ret = i2c_smbus_write_i2c_block_data(client, reg, count,137 values);138 while ((ret == -ENXIO || ret == -EIO) && --try);139 if (ret)140 dev_err(&client->dev,141 "Unable to write registers 0x%02x..0x%02x\n",142 reg, reg + count - 1);143 144 return ret;145}146 147static int rv8803_regs_init(struct rv8803_data *rv8803)148{149 int ret;150 151 ret = rv8803_write_reg(rv8803->client, RV8803_OSC_OFFSET, 0x00);152 if (ret)153 return ret;154 155 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,156 FIELD_PREP(RX8803_CTRL_CSEL, 1)); /* 2s */157 if (ret)158 return ret;159 160 ret = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3,161 (u8[]){ 0, 0, 0 });162 if (ret)163 return ret;164 165 return rv8803_write_reg(rv8803->client, RV8803_RAM, 0x00);166}167 168static int rv8803_regs_configure(struct rv8803_data *rv8803);169 170static int rv8803_regs_reset(struct rv8803_data *rv8803, bool full)171{172 /*173 * The RV-8803 resets all registers to POR defaults after voltage-loss,174 * the Epson RTCs don't, so we manually reset the remainder here.175 */176 if (full || rv8803->type == rx_8803 || rv8803->type == rx_8900) {177 int ret = rv8803_regs_init(rv8803);178 if (ret)179 return ret;180 }181 182 return rv8803_regs_configure(rv8803);183}184 185static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)186{187 struct i2c_client *client = dev_id;188 struct rv8803_data *rv8803 = i2c_get_clientdata(client);189 unsigned long events = 0;190 int flags;191 192 mutex_lock(&rv8803->flags_lock);193 194 flags = rv8803_read_reg(client, RV8803_FLAG);195 if (flags <= 0) {196 mutex_unlock(&rv8803->flags_lock);197 return IRQ_NONE;198 }199 200 if (flags & RV8803_FLAG_V1F)201 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");202 203 if (flags & RV8803_FLAG_V2F)204 dev_warn(&client->dev, "Voltage low, data loss detected.\n");205 206 if (flags & RV8803_FLAG_TF) {207 flags &= ~RV8803_FLAG_TF;208 rv8803->ctrl &= ~RV8803_CTRL_TIE;209 events |= RTC_PF;210 }211 212 if (flags & RV8803_FLAG_AF) {213 flags &= ~RV8803_FLAG_AF;214 rv8803->ctrl &= ~RV8803_CTRL_AIE;215 events |= RTC_AF;216 }217 218 if (flags & RV8803_FLAG_UF) {219 flags &= ~RV8803_FLAG_UF;220 rv8803->ctrl &= ~RV8803_CTRL_UIE;221 events |= RTC_UF;222 }223 224 if (events) {225 rtc_update_irq(rv8803->rtc, 1, events);226 rv8803_write_reg(client, RV8803_FLAG, flags);227 rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);228 }229 230 mutex_unlock(&rv8803->flags_lock);231 232 return IRQ_HANDLED;233}234 235static int rv8803_get_time(struct device *dev, struct rtc_time *tm)236{237 struct rv8803_data *rv8803 = dev_get_drvdata(dev);238 u8 date1[7];239 u8 date2[7];240 u8 *date = date1;241 int ret, flags;242 243 if (rv8803->alarm_invalid) {244 dev_warn(dev, "Corruption detected, data may be invalid.\n");245 return -EINVAL;246 }247 248 flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);249 if (flags < 0)250 return flags;251 252 if (flags & RV8803_FLAG_V2F) {253 dev_warn(dev, "Voltage low, data is invalid.\n");254 return -EINVAL;255 }256 257 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);258 if (ret)259 return ret;260 261 if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {262 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);263 if (ret)264 return ret;265 266 if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))267 date = date2;268 }269 270 tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f);271 tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f);272 tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);273 tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);274 tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);275 tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;276 tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;277 278 return 0;279}280 281static int rv8803_set_time(struct device *dev, struct rtc_time *tm)282{283 struct rv8803_data *rv8803 = dev_get_drvdata(dev);284 u8 date[7];285 int ctrl, flags, ret;286 287 ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);288 if (ctrl < 0)289 return ctrl;290 291 /* Stop the clock */292 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,293 ctrl | RV8803_CTRL_RESET);294 if (ret)295 return ret;296 297 date[RV8803_SEC] = bin2bcd(tm->tm_sec);298 date[RV8803_MIN] = bin2bcd(tm->tm_min);299 date[RV8803_HOUR] = bin2bcd(tm->tm_hour);300 date[RV8803_WEEK] = 1 << (tm->tm_wday);301 date[RV8803_DAY] = bin2bcd(tm->tm_mday);302 date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);303 date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100);304 305 ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);306 if (ret)307 return ret;308 309 /* Restart the clock */310 ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,311 ctrl & ~RV8803_CTRL_RESET);312 if (ret)313 return ret;314 315 mutex_lock(&rv8803->flags_lock);316 317 flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);318 if (flags < 0) {319 mutex_unlock(&rv8803->flags_lock);320 return flags;321 }322 323 if ((flags & RV8803_FLAG_V2F) || rv8803->alarm_invalid) {324 /*325 * If we sense corruption in the alarm registers, but see no326 * voltage loss flag, we can't rely on other registers having327 * sensible values. Reset them fully.328 */329 ret = rv8803_regs_reset(rv8803, rv8803->alarm_invalid);330 if (ret) {331 mutex_unlock(&rv8803->flags_lock);332 return ret;333 }334 335 rv8803->alarm_invalid = false;336 }337 338 ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,339 flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));340 341 mutex_unlock(&rv8803->flags_lock);342 343 return ret;344}345 346static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)347{348 struct rv8803_data *rv8803 = dev_get_drvdata(dev);349 struct i2c_client *client = rv8803->client;350 u8 alarmvals[3];351 int flags, ret;352 353 ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);354 if (ret)355 return ret;356 357 flags = rv8803_read_reg(client, RV8803_FLAG);358 if (flags < 0)359 return flags;360 361 alarmvals[0] &= 0x7f;362 alarmvals[1] &= 0x3f;363 alarmvals[2] &= 0x3f;364 365 if (!bcd_is_valid(alarmvals[0]) ||366 !bcd_is_valid(alarmvals[1]) ||367 !bcd_is_valid(alarmvals[2]))368 goto err_invalid;369 370 alrm->time.tm_sec = 0;371 alrm->time.tm_min = bcd2bin(alarmvals[0]);372 alrm->time.tm_hour = bcd2bin(alarmvals[1]);373 alrm->time.tm_mday = bcd2bin(alarmvals[2]);374 375 alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);376 alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;377 378 if ((unsigned int)alrm->time.tm_mday > 31 ||379 (unsigned int)alrm->time.tm_hour >= 24 ||380 (unsigned int)alrm->time.tm_min >= 60)381 goto err_invalid;382 383 return 0;384 385err_invalid:386 rv8803->alarm_invalid = true;387 return -EINVAL;388}389 390static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)391{392 struct i2c_client *client = to_i2c_client(dev);393 struct rv8803_data *rv8803 = dev_get_drvdata(dev);394 u8 alarmvals[3];395 u8 ctrl[2];396 int ret, err;397 398 /* The alarm has no seconds, round up to nearest minute */399 if (alrm->time.tm_sec) {400 time64_t alarm_time = rtc_tm_to_time64(&alrm->time);401 402 alarm_time += 60 - alrm->time.tm_sec;403 rtc_time64_to_tm(alarm_time, &alrm->time);404 }405 406 mutex_lock(&rv8803->flags_lock);407 408 ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);409 if (ret) {410 mutex_unlock(&rv8803->flags_lock);411 return ret;412 }413 414 alarmvals[0] = bin2bcd(alrm->time.tm_min);415 alarmvals[1] = bin2bcd(alrm->time.tm_hour);416 alarmvals[2] = bin2bcd(alrm->time.tm_mday);417 418 if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {419 rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);420 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,421 rv8803->ctrl);422 if (err) {423 mutex_unlock(&rv8803->flags_lock);424 return err;425 }426 }427 428 ctrl[0] &= ~RV8803_FLAG_AF;429 err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[0]);430 mutex_unlock(&rv8803->flags_lock);431 if (err)432 return err;433 434 err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);435 if (err)436 return err;437 438 if (alrm->enabled) {439 if (rv8803->rtc->uie_rtctimer.enabled)440 rv8803->ctrl |= RV8803_CTRL_UIE;441 if (rv8803->rtc->aie_timer.enabled)442 rv8803->ctrl |= RV8803_CTRL_AIE;443 444 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,445 rv8803->ctrl);446 if (err)447 return err;448 }449 450 return 0;451}452 453static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)454{455 struct i2c_client *client = to_i2c_client(dev);456 struct rv8803_data *rv8803 = dev_get_drvdata(dev);457 int ctrl, flags, err;458 459 ctrl = rv8803->ctrl;460 461 if (enabled) {462 if (rv8803->rtc->uie_rtctimer.enabled)463 ctrl |= RV8803_CTRL_UIE;464 if (rv8803->rtc->aie_timer.enabled)465 ctrl |= RV8803_CTRL_AIE;466 } else {467 if (!rv8803->rtc->uie_rtctimer.enabled)468 ctrl &= ~RV8803_CTRL_UIE;469 if (!rv8803->rtc->aie_timer.enabled)470 ctrl &= ~RV8803_CTRL_AIE;471 }472 473 mutex_lock(&rv8803->flags_lock);474 flags = rv8803_read_reg(client, RV8803_FLAG);475 if (flags < 0) {476 mutex_unlock(&rv8803->flags_lock);477 return flags;478 }479 flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);480 err = rv8803_write_reg(client, RV8803_FLAG, flags);481 mutex_unlock(&rv8803->flags_lock);482 if (err)483 return err;484 485 if (ctrl != rv8803->ctrl) {486 rv8803->ctrl = ctrl;487 err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);488 if (err)489 return err;490 }491 492 return 0;493}494 495static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)496{497 struct i2c_client *client = to_i2c_client(dev);498 struct rv8803_data *rv8803 = dev_get_drvdata(dev);499 unsigned int vl = 0;500 int flags, ret = 0;501 502 switch (cmd) {503 case RTC_VL_READ:504 flags = rv8803_read_reg(client, RV8803_FLAG);505 if (flags < 0)506 return flags;507 508 if (flags & RV8803_FLAG_V1F) {509 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");510 vl = RTC_VL_ACCURACY_LOW;511 }512 513 if (flags & RV8803_FLAG_V2F)514 vl |= RTC_VL_DATA_INVALID;515 516 return put_user(vl, (unsigned int __user *)arg);517 518 case RTC_VL_CLR:519 mutex_lock(&rv8803->flags_lock);520 flags = rv8803_read_reg(client, RV8803_FLAG);521 if (flags < 0) {522 mutex_unlock(&rv8803->flags_lock);523 return flags;524 }525 526 flags &= ~RV8803_FLAG_V1F;527 ret = rv8803_write_reg(client, RV8803_FLAG, flags);528 mutex_unlock(&rv8803->flags_lock);529 if (ret)530 return ret;531 532 return 0;533 534 default:535 return -ENOIOCTLCMD;536 }537}538 539static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,540 size_t bytes)541{542 return rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);543}544 545static int rv8803_nvram_read(void *priv, unsigned int offset,546 void *val, size_t bytes)547{548 int ret;549 550 ret = rv8803_read_reg(priv, RV8803_RAM);551 if (ret < 0)552 return ret;553 554 *(u8 *)val = ret;555 556 return 0;557}558 559static const struct rtc_class_ops rv8803_rtc_ops = {560 .read_time = rv8803_get_time,561 .set_time = rv8803_set_time,562 .ioctl = rv8803_ioctl,563 .read_alarm = rv8803_get_alarm,564 .set_alarm = rv8803_set_alarm,565 .alarm_irq_enable = rv8803_alarm_irq_enable,566};567 568static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)569{570 struct i2c_client *client = rv8803->client;571 struct device_node *node = client->dev.of_node;572 int err;573 u8 flags;574 575 if (!node)576 return 0;577 578 if (rv8803->type != rx_8900)579 return 0;580 581 err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);582 if (err < 0)583 return err;584 585 flags = (u8)err;586 flags &= ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF);587 flags |= rv8803->backup;588 589 return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,590 flags);591}592 593/* configure registers with values different than the Power-On reset defaults */594static int rv8803_regs_configure(struct rv8803_data *rv8803)595{596 int err;597 598 err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);599 if (err)600 return err;601 602 err = rx8900_trickle_charger_init(rv8803);603 if (err) {604 dev_err(&rv8803->client->dev, "failed to init charger\n");605 return err;606 }607 608 return 0;609}610 611static int rv8803_resume(struct device *dev)612{613 struct rv8803_data *rv8803 = dev_get_drvdata(dev);614 615 if (rv8803->client->irq > 0 && device_may_wakeup(dev))616 disable_irq_wake(rv8803->client->irq);617 618 return 0;619}620 621static int rv8803_suspend(struct device *dev)622{623 struct rv8803_data *rv8803 = dev_get_drvdata(dev);624 625 if (rv8803->client->irq > 0 && device_may_wakeup(dev))626 enable_irq_wake(rv8803->client->irq);627 628 return 0;629}630 631static DEFINE_SIMPLE_DEV_PM_OPS(rv8803_pm_ops, rv8803_suspend, rv8803_resume);632 633static const struct i2c_device_id rv8803_id[] = {634 { "rv8803", rv_8803 },635 { "rv8804", rx_8804 },636 { "rx8803", rx_8803 },637 { "rx8900", rx_8900 },638 { }639};640MODULE_DEVICE_TABLE(i2c, rv8803_id);641 642static int rv8803_probe(struct i2c_client *client)643{644 struct i2c_adapter *adapter = client->adapter;645 struct rv8803_data *rv8803;646 int err, flags;647 struct nvmem_config nvmem_cfg = {648 .name = "rv8803_nvram",649 .word_size = 1,650 .stride = 1,651 .size = 1,652 .reg_read = rv8803_nvram_read,653 .reg_write = rv8803_nvram_write,654 .priv = client,655 };656 657 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |658 I2C_FUNC_SMBUS_I2C_BLOCK)) {659 dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");660 return -EIO;661 }662 663 rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),664 GFP_KERNEL);665 if (!rv8803)666 return -ENOMEM;667 668 mutex_init(&rv8803->flags_lock);669 rv8803->client = client;670 if (client->dev.of_node) {671 rv8803->type = (uintptr_t)of_device_get_match_data(&client->dev);672 } else {673 const struct i2c_device_id *id = i2c_match_id(rv8803_id, client);674 675 rv8803->type = id->driver_data;676 }677 i2c_set_clientdata(client, rv8803);678 679 flags = rv8803_read_reg(client, RV8803_FLAG);680 if (flags < 0)681 return flags;682 683 if (flags & RV8803_FLAG_V1F)684 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");685 686 if (flags & RV8803_FLAG_V2F)687 dev_warn(&client->dev, "Voltage low, data loss detected.\n");688 689 if (flags & RV8803_FLAG_AF)690 dev_warn(&client->dev, "An alarm maybe have been missed.\n");691 692 rv8803->rtc = devm_rtc_allocate_device(&client->dev);693 if (IS_ERR(rv8803->rtc))694 return PTR_ERR(rv8803->rtc);695 696 if (client->irq > 0) {697 unsigned long irqflags = IRQF_TRIGGER_LOW;698 699 if (dev_fwnode(&client->dev))700 irqflags = 0;701 702 err = devm_request_threaded_irq(&client->dev, client->irq,703 NULL, rv8803_handle_irq,704 irqflags | IRQF_ONESHOT,705 "rv8803", client);706 if (err) {707 dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");708 client->irq = 0;709 } else {710 device_init_wakeup(&client->dev, true);711 err = dev_pm_set_wake_irq(&client->dev, client->irq);712 if (err)713 dev_err(&client->dev, "failed to set wake IRQ\n");714 }715 } else {716 if (device_property_read_bool(&client->dev, "wakeup-source"))717 device_init_wakeup(&client->dev, true);718 else719 clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features);720 }721 722 if (of_property_read_bool(client->dev.of_node, "epson,vdet-disable"))723 rv8803->backup |= RX8900_FLAG_VDETOFF;724 725 if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable"))726 rv8803->backup |= RX8900_FLAG_SWOFF;727 728 err = rv8803_regs_configure(rv8803);729 if (err)730 return err;731 732 rv8803->rtc->ops = &rv8803_rtc_ops;733 rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;734 rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;735 err = devm_rtc_register_device(rv8803->rtc);736 if (err)737 return err;738 739 devm_rtc_nvmem_register(rv8803->rtc, &nvmem_cfg);740 741 rv8803->rtc->max_user_freq = 1;742 743 return 0;744}745 746static const __maybe_unused struct of_device_id rv8803_of_match[] = {747 {748 .compatible = "microcrystal,rv8803",749 .data = (void *)rv_8803750 },751 {752 .compatible = "epson,rx8803",753 .data = (void *)rx_8803754 },755 {756 .compatible = "epson,rx8804",757 .data = (void *)rx_8804758 },759 {760 .compatible = "epson,rx8900",761 .data = (void *)rx_8900762 },763 { }764};765MODULE_DEVICE_TABLE(of, rv8803_of_match);766 767static struct i2c_driver rv8803_driver = {768 .driver = {769 .name = "rtc-rv8803",770 .of_match_table = of_match_ptr(rv8803_of_match),771 .pm = &rv8803_pm_ops,772 },773 .probe = rv8803_probe,774 .id_table = rv8803_id,775};776module_i2c_driver(rv8803_driver);777 778MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");779MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");780MODULE_LICENSE("GPL v2");781