1 // SPDX-License-Identifier: GPL-2.0
3 * RTC driver for the Micro Crystal RV3028
5 * Copyright (C) 2019 Micro Crystal SA
7 * Alexandre Belloni <alexandre.belloni@bootlin.com>
11 #include <linux/clk-provider.h>
12 #include <linux/bcd.h>
13 #include <linux/bitops.h>
14 #include <linux/i2c.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel.h>
17 #include <linux/log2.h>
18 #include <linux/module.h>
19 #include <linux/of_device.h>
20 #include <linux/regmap.h>
21 #include <linux/rtc.h>
23 #define RV3028_SEC 0x00
24 #define RV3028_MIN 0x01
25 #define RV3028_HOUR 0x02
26 #define RV3028_WDAY 0x03
27 #define RV3028_DAY 0x04
28 #define RV3028_MONTH 0x05
29 #define RV3028_YEAR 0x06
30 #define RV3028_ALARM_MIN 0x07
31 #define RV3028_ALARM_HOUR 0x08
32 #define RV3028_ALARM_DAY 0x09
33 #define RV3028_STATUS 0x0E
34 #define RV3028_CTRL1 0x0F
35 #define RV3028_CTRL2 0x10
36 #define RV3028_EVT_CTRL 0x13
37 #define RV3028_TS_COUNT 0x14
38 #define RV3028_TS_SEC 0x15
39 #define RV3028_RAM1 0x1F
40 #define RV3028_EEPROM_ADDR 0x25
41 #define RV3028_EEPROM_DATA 0x26
42 #define RV3028_EEPROM_CMD 0x27
43 #define RV3028_CLKOUT 0x35
44 #define RV3028_OFFSET 0x36
45 #define RV3028_BACKUP 0x37
47 #define RV3028_STATUS_PORF BIT(0)
48 #define RV3028_STATUS_EVF BIT(1)
49 #define RV3028_STATUS_AF BIT(2)
50 #define RV3028_STATUS_TF BIT(3)
51 #define RV3028_STATUS_UF BIT(4)
52 #define RV3028_STATUS_BSF BIT(5)
53 #define RV3028_STATUS_CLKF BIT(6)
54 #define RV3028_STATUS_EEBUSY BIT(7)
56 #define RV3028_CLKOUT_FD_MASK GENMASK(2, 0)
57 #define RV3028_CLKOUT_PORIE BIT(3)
58 #define RV3028_CLKOUT_CLKSY BIT(6)
59 #define RV3028_CLKOUT_CLKOE BIT(7)
61 #define RV3028_CTRL1_EERD BIT(3)
62 #define RV3028_CTRL1_WADA BIT(5)
64 #define RV3028_CTRL2_RESET BIT(0)
65 #define RV3028_CTRL2_12_24 BIT(1)
66 #define RV3028_CTRL2_EIE BIT(2)
67 #define RV3028_CTRL2_AIE BIT(3)
68 #define RV3028_CTRL2_TIE BIT(4)
69 #define RV3028_CTRL2_UIE BIT(5)
70 #define RV3028_CTRL2_TSE BIT(7)
72 #define RV3028_EVT_CTRL_TSR BIT(2)
74 #define RV3028_EEPROM_CMD_UPDATE 0x11
75 #define RV3028_EEPROM_CMD_WRITE 0x21
76 #define RV3028_EEPROM_CMD_READ 0x22
78 #define RV3028_EEBUSY_POLL 10000
79 #define RV3028_EEBUSY_TIMEOUT 100000
81 #define RV3028_BACKUP_TCE BIT(5)
82 #define RV3028_BACKUP_TCR_MASK GENMASK(1,0)
84 #define OFFSET_STEP_PPT 953674
91 struct regmap *regmap;
92 struct rtc_device *rtc;
93 enum rv3028_type type;
94 #ifdef CONFIG_COMMON_CLK
95 struct clk_hw clkout_hw;
99 static u16 rv3028_trickle_resistors[] = {3000, 5000, 9000, 15000};
101 static ssize_t timestamp0_store(struct device *dev,
102 struct device_attribute *attr,
103 const char *buf, size_t count)
105 struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
107 regmap_update_bits(rv3028->regmap, RV3028_EVT_CTRL, RV3028_EVT_CTRL_TSR,
108 RV3028_EVT_CTRL_TSR);
113 static ssize_t timestamp0_show(struct device *dev,
114 struct device_attribute *attr, char *buf)
116 struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
121 ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
128 ret = regmap_bulk_read(rv3028->regmap, RV3028_TS_SEC, date,
133 tm.tm_sec = bcd2bin(date[0]);
134 tm.tm_min = bcd2bin(date[1]);
135 tm.tm_hour = bcd2bin(date[2]);
136 tm.tm_mday = bcd2bin(date[3]);
137 tm.tm_mon = bcd2bin(date[4]) - 1;
138 tm.tm_year = bcd2bin(date[5]) + 100;
140 ret = rtc_valid_tm(&tm);
144 return sprintf(buf, "%llu\n",
145 (unsigned long long)rtc_tm_to_time64(&tm));
148 static DEVICE_ATTR_RW(timestamp0);
150 static ssize_t timestamp0_count_show(struct device *dev,
151 struct device_attribute *attr, char *buf)
153 struct rv3028_data *rv3028 = dev_get_drvdata(dev->parent);
156 ret = regmap_read(rv3028->regmap, RV3028_TS_COUNT, &count);
160 return sprintf(buf, "%u\n", count);
163 static DEVICE_ATTR_RO(timestamp0_count);
165 static struct attribute *rv3028_attrs[] = {
166 &dev_attr_timestamp0.attr,
167 &dev_attr_timestamp0_count.attr,
171 static const struct attribute_group rv3028_attr_group = {
172 .attrs = rv3028_attrs,
175 static int rv3028_exit_eerd(struct rv3028_data *rv3028, u32 eerd)
180 return regmap_update_bits(rv3028->regmap, RV3028_CTRL1, RV3028_CTRL1_EERD, 0);
183 static int rv3028_enter_eerd(struct rv3028_data *rv3028, u32 *eerd)
188 ret = regmap_read(rv3028->regmap, RV3028_CTRL1, &ctrl1);
192 *eerd = ctrl1 & RV3028_CTRL1_EERD;
196 ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
197 RV3028_CTRL1_EERD, RV3028_CTRL1_EERD);
201 ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
202 !(status & RV3028_STATUS_EEBUSY),
203 RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
205 rv3028_exit_eerd(rv3028, *eerd);
213 static int rv3028_update_eeprom(struct rv3028_data *rv3028, u32 eerd)
218 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
222 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, RV3028_EEPROM_CMD_UPDATE);
226 usleep_range(63000, RV3028_EEBUSY_TIMEOUT);
228 ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
229 !(status & RV3028_STATUS_EEBUSY),
230 RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
233 rv3028_exit_eerd(rv3028, eerd);
238 static int rv3028_update_cfg(struct rv3028_data *rv3028, unsigned int reg,
239 unsigned int mask, unsigned int val)
244 ret = rv3028_enter_eerd(rv3028, &eerd);
248 ret = regmap_update_bits(rv3028->regmap, reg, mask, val);
250 rv3028_exit_eerd(rv3028, eerd);
254 return rv3028_update_eeprom(rv3028, eerd);
257 static irqreturn_t rv3028_handle_irq(int irq, void *dev_id)
259 struct rv3028_data *rv3028 = dev_id;
260 unsigned long events = 0;
261 u32 status = 0, ctrl = 0;
263 if (regmap_read(rv3028->regmap, RV3028_STATUS, &status) < 0 ||
268 if (status & RV3028_STATUS_PORF)
269 dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n");
271 if (status & RV3028_STATUS_TF) {
272 status |= RV3028_STATUS_TF;
273 ctrl |= RV3028_CTRL2_TIE;
277 if (status & RV3028_STATUS_AF) {
278 status |= RV3028_STATUS_AF;
279 ctrl |= RV3028_CTRL2_AIE;
283 if (status & RV3028_STATUS_UF) {
284 status |= RV3028_STATUS_UF;
285 ctrl |= RV3028_CTRL2_UIE;
290 rtc_update_irq(rv3028->rtc, 1, events);
291 regmap_update_bits(rv3028->regmap, RV3028_STATUS, status, 0);
292 regmap_update_bits(rv3028->regmap, RV3028_CTRL2, ctrl, 0);
295 if (status & RV3028_STATUS_EVF) {
296 sysfs_notify(&rv3028->rtc->dev.kobj, NULL,
297 dev_attr_timestamp0.attr.name);
298 dev_warn(&rv3028->rtc->dev, "event detected");
304 static int rv3028_get_time(struct device *dev, struct rtc_time *tm)
306 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
310 ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
314 if (status & RV3028_STATUS_PORF) {
315 dev_warn(dev, "Voltage low, data is invalid.\n");
319 ret = regmap_bulk_read(rv3028->regmap, RV3028_SEC, date, sizeof(date));
323 tm->tm_sec = bcd2bin(date[RV3028_SEC] & 0x7f);
324 tm->tm_min = bcd2bin(date[RV3028_MIN] & 0x7f);
325 tm->tm_hour = bcd2bin(date[RV3028_HOUR] & 0x3f);
326 tm->tm_wday = ilog2(date[RV3028_WDAY] & 0x7f);
327 tm->tm_mday = bcd2bin(date[RV3028_DAY] & 0x3f);
328 tm->tm_mon = bcd2bin(date[RV3028_MONTH] & 0x1f) - 1;
329 tm->tm_year = bcd2bin(date[RV3028_YEAR]) + 100;
334 static int rv3028_set_time(struct device *dev, struct rtc_time *tm)
336 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
340 date[RV3028_SEC] = bin2bcd(tm->tm_sec);
341 date[RV3028_MIN] = bin2bcd(tm->tm_min);
342 date[RV3028_HOUR] = bin2bcd(tm->tm_hour);
343 date[RV3028_WDAY] = 1 << (tm->tm_wday);
344 date[RV3028_DAY] = bin2bcd(tm->tm_mday);
345 date[RV3028_MONTH] = bin2bcd(tm->tm_mon + 1);
346 date[RV3028_YEAR] = bin2bcd(tm->tm_year - 100);
349 * Writing to the Seconds register has the same effect as setting RESET
352 ret = regmap_bulk_write(rv3028->regmap, RV3028_SEC, date,
357 ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
358 RV3028_STATUS_PORF, 0);
363 static int rv3028_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
365 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
367 int status, ctrl, ret;
369 ret = regmap_bulk_read(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
374 ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
378 ret = regmap_read(rv3028->regmap, RV3028_CTRL2, &ctrl);
382 alrm->time.tm_sec = 0;
383 alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
384 alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
385 alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
387 alrm->enabled = !!(ctrl & RV3028_CTRL2_AIE);
388 alrm->pending = (status & RV3028_STATUS_AF) && alrm->enabled;
393 static int rv3028_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
395 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
400 /* The alarm has no seconds, round up to nearest minute */
401 if (alrm->time.tm_sec) {
402 time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
404 alarm_time += 60 - alrm->time.tm_sec;
405 rtc_time64_to_tm(alarm_time, &alrm->time);
408 ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
409 RV3028_CTRL2_AIE | RV3028_CTRL2_UIE, 0);
413 alarmvals[0] = bin2bcd(alrm->time.tm_min);
414 alarmvals[1] = bin2bcd(alrm->time.tm_hour);
415 alarmvals[2] = bin2bcd(alrm->time.tm_mday);
417 ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
418 RV3028_STATUS_AF, 0);
422 ret = regmap_bulk_write(rv3028->regmap, RV3028_ALARM_MIN, alarmvals,
428 if (rv3028->rtc->uie_rtctimer.enabled)
429 ctrl |= RV3028_CTRL2_UIE;
430 if (rv3028->rtc->aie_timer.enabled)
431 ctrl |= RV3028_CTRL2_AIE;
434 ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
435 RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
440 static int rv3028_alarm_irq_enable(struct device *dev, unsigned int enabled)
442 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
446 if (rv3028->rtc->uie_rtctimer.enabled)
447 ctrl |= RV3028_CTRL2_UIE;
448 if (rv3028->rtc->aie_timer.enabled)
449 ctrl |= RV3028_CTRL2_AIE;
452 ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
453 RV3028_STATUS_AF | RV3028_STATUS_UF, 0);
457 ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
458 RV3028_CTRL2_UIE | RV3028_CTRL2_AIE, ctrl);
465 static int rv3028_read_offset(struct device *dev, long *offset)
467 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
468 int ret, value, steps;
470 ret = regmap_read(rv3028->regmap, RV3028_OFFSET, &value);
474 steps = sign_extend32(value << 1, 8);
476 ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);
482 *offset = DIV_ROUND_CLOSEST(steps * OFFSET_STEP_PPT, 1000);
487 static int rv3028_set_offset(struct device *dev, long offset)
489 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
493 offset = clamp(offset, -244141L, 243187L) * 1000;
494 offset = DIV_ROUND_CLOSEST(offset, OFFSET_STEP_PPT);
496 ret = rv3028_enter_eerd(rv3028, &eerd);
500 ret = regmap_write(rv3028->regmap, RV3028_OFFSET, offset >> 1);
504 ret = regmap_update_bits(rv3028->regmap, RV3028_BACKUP, BIT(7),
509 return rv3028_update_eeprom(rv3028, eerd);
512 rv3028_exit_eerd(rv3028, eerd);
518 static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
520 struct rv3028_data *rv3028 = dev_get_drvdata(dev);
525 ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
529 status = status & RV3028_STATUS_PORF ? RTC_VL_DATA_INVALID : 0;
530 return put_user(status, (unsigned int __user *)arg);
537 static int rv3028_nvram_write(void *priv, unsigned int offset, void *val,
540 return regmap_bulk_write(priv, RV3028_RAM1 + offset, val, bytes);
543 static int rv3028_nvram_read(void *priv, unsigned int offset, void *val,
546 return regmap_bulk_read(priv, RV3028_RAM1 + offset, val, bytes);
549 static int rv3028_eeprom_write(void *priv, unsigned int offset, void *val,
552 struct rv3028_data *rv3028 = priv;
557 ret = rv3028_enter_eerd(rv3028, &eerd);
561 for (i = 0; i < bytes; i++) {
562 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_ADDR, offset + i);
566 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_DATA, buf[i]);
570 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
574 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD,
575 RV3028_EEPROM_CMD_WRITE);
579 usleep_range(RV3028_EEBUSY_POLL, RV3028_EEBUSY_TIMEOUT);
581 ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
582 !(status & RV3028_STATUS_EEBUSY),
584 RV3028_EEBUSY_TIMEOUT);
590 rv3028_exit_eerd(rv3028, eerd);
595 static int rv3028_eeprom_read(void *priv, unsigned int offset, void *val,
598 struct rv3028_data *rv3028 = priv;
599 u32 status, eerd, data;
603 ret = rv3028_enter_eerd(rv3028, &eerd);
607 for (i = 0; i < bytes; i++) {
608 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_ADDR, offset + i);
612 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD, 0x0);
616 ret = regmap_write(rv3028->regmap, RV3028_EEPROM_CMD,
617 RV3028_EEPROM_CMD_READ);
621 ret = regmap_read_poll_timeout(rv3028->regmap, RV3028_STATUS, status,
622 !(status & RV3028_STATUS_EEBUSY),
624 RV3028_EEBUSY_TIMEOUT);
628 ret = regmap_read(rv3028->regmap, RV3028_EEPROM_DATA, &data);
635 rv3028_exit_eerd(rv3028, eerd);
640 #ifdef CONFIG_COMMON_CLK
641 #define clkout_hw_to_rv3028(hw) container_of(hw, struct rv3028_data, clkout_hw)
643 static int clkout_rates[] = {
652 static unsigned long rv3028_clkout_recalc_rate(struct clk_hw *hw,
653 unsigned long parent_rate)
656 struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
658 ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &clkout);
662 clkout &= RV3028_CLKOUT_FD_MASK;
663 return clkout_rates[clkout];
666 static long rv3028_clkout_round_rate(struct clk_hw *hw, unsigned long rate,
667 unsigned long *prate)
671 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
672 if (clkout_rates[i] <= rate)
673 return clkout_rates[i];
678 static int rv3028_clkout_set_rate(struct clk_hw *hw, unsigned long rate,
679 unsigned long parent_rate)
683 struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
685 ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &enabled);
689 ret = regmap_write(rv3028->regmap, RV3028_CLKOUT, 0x0);
693 enabled &= RV3028_CLKOUT_CLKOE;
695 for (i = 0; i < ARRAY_SIZE(clkout_rates); i++)
696 if (clkout_rates[i] == rate)
697 return rv3028_update_cfg(rv3028, RV3028_CLKOUT, 0xff,
698 RV3028_CLKOUT_CLKSY | enabled | i);
703 static int rv3028_clkout_prepare(struct clk_hw *hw)
705 struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
707 return regmap_write(rv3028->regmap, RV3028_CLKOUT,
708 RV3028_CLKOUT_CLKSY | RV3028_CLKOUT_CLKOE);
711 static void rv3028_clkout_unprepare(struct clk_hw *hw)
713 struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
715 regmap_write(rv3028->regmap, RV3028_CLKOUT, 0x0);
716 regmap_update_bits(rv3028->regmap, RV3028_STATUS,
717 RV3028_STATUS_CLKF, 0);
720 static int rv3028_clkout_is_prepared(struct clk_hw *hw)
723 struct rv3028_data *rv3028 = clkout_hw_to_rv3028(hw);
725 ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &clkout);
729 return !!(clkout & RV3028_CLKOUT_CLKOE);
732 static const struct clk_ops rv3028_clkout_ops = {
733 .prepare = rv3028_clkout_prepare,
734 .unprepare = rv3028_clkout_unprepare,
735 .is_prepared = rv3028_clkout_is_prepared,
736 .recalc_rate = rv3028_clkout_recalc_rate,
737 .round_rate = rv3028_clkout_round_rate,
738 .set_rate = rv3028_clkout_set_rate,
741 static int rv3028_clkout_register_clk(struct rv3028_data *rv3028,
742 struct i2c_client *client)
746 struct clk_init_data init;
747 struct device_node *node = client->dev.of_node;
749 ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
750 RV3028_STATUS_CLKF, 0);
754 init.name = "rv3028-clkout";
755 init.ops = &rv3028_clkout_ops;
757 init.parent_names = NULL;
758 init.num_parents = 0;
759 rv3028->clkout_hw.init = &init;
761 /* optional override of the clockname */
762 of_property_read_string(node, "clock-output-names", &init.name);
764 /* register the clock */
765 clk = devm_clk_register(&client->dev, &rv3028->clkout_hw);
767 of_clk_add_provider(node, of_clk_src_simple_get, clk);
773 static struct rtc_class_ops rv3028_rtc_ops = {
774 .read_time = rv3028_get_time,
775 .set_time = rv3028_set_time,
776 .read_offset = rv3028_read_offset,
777 .set_offset = rv3028_set_offset,
778 .ioctl = rv3028_ioctl,
781 static const struct regmap_config regmap_config = {
784 .max_register = 0x37,
787 static int rv3028_probe(struct i2c_client *client)
789 struct rv3028_data *rv3028;
792 struct nvmem_config nvmem_cfg = {
793 .name = "rv3028_nvram",
797 .type = NVMEM_TYPE_BATTERY_BACKED,
798 .reg_read = rv3028_nvram_read,
799 .reg_write = rv3028_nvram_write,
801 struct nvmem_config eeprom_cfg = {
802 .name = "rv3028_eeprom",
806 .type = NVMEM_TYPE_EEPROM,
807 .reg_read = rv3028_eeprom_read,
808 .reg_write = rv3028_eeprom_write,
811 rv3028 = devm_kzalloc(&client->dev, sizeof(struct rv3028_data),
816 rv3028->regmap = devm_regmap_init_i2c(client, ®map_config);
817 if (IS_ERR(rv3028->regmap))
818 return PTR_ERR(rv3028->regmap);
820 i2c_set_clientdata(client, rv3028);
822 ret = regmap_read(rv3028->regmap, RV3028_STATUS, &status);
826 if (status & RV3028_STATUS_PORF)
827 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
829 if (status & RV3028_STATUS_AF)
830 dev_warn(&client->dev, "An alarm may have been missed.\n");
832 rv3028->rtc = devm_rtc_allocate_device(&client->dev);
833 if (IS_ERR(rv3028->rtc))
834 return PTR_ERR(rv3028->rtc);
836 if (client->irq > 0) {
837 ret = devm_request_threaded_irq(&client->dev, client->irq,
838 NULL, rv3028_handle_irq,
839 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
842 dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
845 rv3028_rtc_ops.read_alarm = rv3028_get_alarm;
846 rv3028_rtc_ops.set_alarm = rv3028_set_alarm;
847 rv3028_rtc_ops.alarm_irq_enable = rv3028_alarm_irq_enable;
851 ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL1,
852 RV3028_CTRL1_WADA, RV3028_CTRL1_WADA);
856 /* setup timestamping */
857 ret = regmap_update_bits(rv3028->regmap, RV3028_CTRL2,
858 RV3028_CTRL2_EIE | RV3028_CTRL2_TSE,
859 RV3028_CTRL2_EIE | RV3028_CTRL2_TSE);
863 /* setup trickle charger */
864 if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
868 for (i = 0; i < ARRAY_SIZE(rv3028_trickle_resistors); i++)
869 if (ohms == rv3028_trickle_resistors[i])
872 if (i < ARRAY_SIZE(rv3028_trickle_resistors)) {
873 ret = rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_TCE |
874 RV3028_BACKUP_TCR_MASK, RV3028_BACKUP_TCE | i);
878 dev_warn(&client->dev, "invalid trickle resistor value\n");
882 ret = rtc_add_group(rv3028->rtc, &rv3028_attr_group);
886 rv3028->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
887 rv3028->rtc->range_max = RTC_TIMESTAMP_END_2099;
888 rv3028->rtc->ops = &rv3028_rtc_ops;
889 ret = rtc_register_device(rv3028->rtc);
893 nvmem_cfg.priv = rv3028->regmap;
894 rtc_nvmem_register(rv3028->rtc, &nvmem_cfg);
895 eeprom_cfg.priv = rv3028;
896 rtc_nvmem_register(rv3028->rtc, &eeprom_cfg);
898 rv3028->rtc->max_user_freq = 1;
900 #ifdef CONFIG_COMMON_CLK
901 rv3028_clkout_register_clk(rv3028, client);
906 static const struct of_device_id rv3028_of_match[] = {
907 { .compatible = "microcrystal,rv3028", },
910 MODULE_DEVICE_TABLE(of, rv3028_of_match);
912 static struct i2c_driver rv3028_driver = {
914 .name = "rtc-rv3028",
915 .of_match_table = of_match_ptr(rv3028_of_match),
917 .probe_new = rv3028_probe,
919 module_i2c_driver(rv3028_driver);
921 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
922 MODULE_DESCRIPTION("Micro Crystal RV3028 RTC driver");
923 MODULE_LICENSE("GPL v2");