drivers/rtc/rtc-pcf85363.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * drivers/rtc/rtc-pcf85363.c
  *
  * Driver for NXP PCF85363 real-time clock.
  *
  * Copyright (C) 2017 Eric Nelson
  */
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/rtc.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/bcd.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>

 /*
  * Date/Time registers
  */
 #define DT_100THS	0x00
 #define DT_SECS		0x01
 #define DT_MINUTES	0x02
 #define DT_HOURS	0x03
 #define DT_DAYS		0x04
 #define DT_WEEKDAYS	0x05
 #define DT_MONTHS	0x06
 #define DT_YEARS	0x07

 /*
  * Alarm registers
  */
 #define DT_SECOND_ALM1	0x08
 #define DT_MINUTE_ALM1	0x09
 #define DT_HOUR_ALM1	0x0a
 #define DT_DAY_ALM1	0x0b
 #define DT_MONTH_ALM1	0x0c
 #define DT_MINUTE_ALM2	0x0d
 #define DT_HOUR_ALM2	0x0e
 #define DT_WEEKDAY_ALM2	0x0f
 #define DT_ALARM_EN	0x10

 /*
  * Time stamp registers
  */
 #define DT_TIMESTAMP1	0x11
 #define DT_TIMESTAMP2	0x17
 #define DT_TIMESTAMP3	0x1d
 #define DT_TS_MODE	0x23

 /*
  * control registers
  */
 #define CTRL_OFFSET	0x24
 #define CTRL_OSCILLATOR	0x25
 #define CTRL_BATTERY	0x26
 #define CTRL_PIN_IO	0x27
 #define CTRL_FUNCTION	0x28
 #define CTRL_INTA_EN	0x29
 #define CTRL_INTB_EN	0x2a
 #define CTRL_FLAGS	0x2b
 #define CTRL_RAMBYTE	0x2c
 #define CTRL_WDOG	0x2d
 #define CTRL_STOP_EN	0x2e
 #define CTRL_RESETS	0x2f
 #define CTRL_RAM	0x40

 #define ALRM_SEC_A1E	BIT(0)
 #define ALRM_MIN_A1E	BIT(1)
 #define ALRM_HR_A1E	BIT(2)
 #define ALRM_DAY_A1E	BIT(3)
 #define ALRM_MON_A1E	BIT(4)
 #define ALRM_MIN_A2E	BIT(5)
 #define ALRM_HR_A2E	BIT(6)
 #define ALRM_DAY_A2E	BIT(7)

 #define INT_WDIE	BIT(0)
 #define INT_BSIE	BIT(1)
 #define INT_TSRIE	BIT(2)
 #define INT_A2IE	BIT(3)
 #define INT_A1IE	BIT(4)
 #define INT_OIE		BIT(5)
 #define INT_PIE		BIT(6)
 #define INT_ILP		BIT(7)

 #define FLAGS_TSR1F	BIT(0)
 #define FLAGS_TSR2F	BIT(1)
 #define FLAGS_TSR3F	BIT(2)
 #define FLAGS_BSF	BIT(3)
 #define FLAGS_WDF	BIT(4)
 #define FLAGS_A1F	BIT(5)
 #define FLAGS_A2F	BIT(6)
 #define FLAGS_PIF	BIT(7)

 #define PIN_IO_INTAPM	GENMASK(1, 0)
 #define PIN_IO_INTA_CLK	0
 #define PIN_IO_INTA_BAT	1
 #define PIN_IO_INTA_OUT	2
 #define PIN_IO_INTA_HIZ	3

 #define OSC_CAP_SEL	GENMASK(1, 0)
 #define OSC_CAP_6000	0x01
 #define OSC_CAP_12500	0x02

 #define STOP_EN_STOP	BIT(0)

 #define RESET_CPR	0xa4

 #define NVRAM_SIZE	0x40

 struct pcf85363 {
 	struct rtc_device	*rtc;
 	struct regmap		*regmap;
 };

 struct pcf85x63_config {
 	struct regmap_config regmap;
 	unsigned int num_nvram;
 };

 static int pcf85363_load_capacitance(struct pcf85363 *pcf85363, struct device_node *node)
 {
 	u32 load = 7000;
 	u8 value = 0;

 	of_property_read_u32(node, "quartz-load-femtofarads", &load);

 	switch (load) {
 	default:
 		dev_warn(&pcf85363->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
 			 load);
 		fallthrough;
 	case 7000:
 		break;
 	case 6000:
 		value = OSC_CAP_6000;
 		break;
 	case 12500:
 		value = OSC_CAP_12500;
 		break;
 	}

 	return regmap_update_bits(pcf85363->regmap, CTRL_OSCILLATOR,
 				  OSC_CAP_SEL, value);
 }

 static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
 	unsigned char buf[DT_YEARS + 1];
 	int ret, len = sizeof(buf);

 	/* read the RTC date and time registers all at once */
 	ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len);
 	if (ret) {
 		dev_err(dev, "%s: error %d\n", __func__, ret);
 		return ret;
 	}

 	tm->tm_year = bcd2bin(buf[DT_YEARS]);
 	/* adjust for 1900 base of rtc_time */
 	tm->tm_year += 100;

 	tm->tm_wday = buf[DT_WEEKDAYS] & 7;
 	buf[DT_SECS] &= 0x7F;
 	tm->tm_sec = bcd2bin(buf[DT_SECS]);
 	buf[DT_MINUTES] &= 0x7F;
 	tm->tm_min = bcd2bin(buf[DT_MINUTES]);
 	tm->tm_hour = bcd2bin(buf[DT_HOURS]);
 	tm->tm_mday = bcd2bin(buf[DT_DAYS]);
 	tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1;

 	return 0;
 }

 static int pcf85363_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
 	unsigned char tmp[11];
 	unsigned char *buf = &tmp[2];
 	int ret;

 	tmp[0] = STOP_EN_STOP;
 	tmp[1] = RESET_CPR;

 	buf[DT_100THS] = 0;
 	buf[DT_SECS] = bin2bcd(tm->tm_sec);
 	buf[DT_MINUTES] = bin2bcd(tm->tm_min);
 	buf[DT_HOURS] = bin2bcd(tm->tm_hour);
 	buf[DT_DAYS] = bin2bcd(tm->tm_mday);
 	buf[DT_WEEKDAYS] = tm->tm_wday;
 	buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1);
 	buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);

 	ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
 				tmp, 2);
 	if (ret)
 		return ret;

 	ret = regmap_bulk_write(pcf85363->regmap, DT_100THS,
 				buf, sizeof(tmp) - 2);
 	if (ret)
 		return ret;

 	return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0);
 }

 static int pcf85363_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
 	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
 	unsigned int val;
 	int ret;

 	ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
 			       sizeof(buf));
 	if (ret)
 		return ret;

 	alrm->time.tm_sec = bcd2bin(buf[0]);
 	alrm->time.tm_min = bcd2bin(buf[1]);
 	alrm->time.tm_hour = bcd2bin(buf[2]);
 	alrm->time.tm_mday = bcd2bin(buf[3]);
 	alrm->time.tm_mon = bcd2bin(buf[4]) - 1;

 	ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
 	if (ret)
 		return ret;

 	alrm->enabled =  !!(val & INT_A1IE);

 	return 0;
 }

 static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
 					  int enabled)
 {
 	unsigned int alarm_flags = ALRM_SEC_A1E | ALRM_MIN_A1E | ALRM_HR_A1E |
 				   ALRM_DAY_A1E | ALRM_MON_A1E;
 	int ret;

 	ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
 				 enabled ? alarm_flags : 0);
 	if (ret)
 		return ret;

 	ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
 				 INT_A1IE, enabled ? INT_A1IE : 0);

 	if (ret || enabled)
 		return ret;

 	/* clear current flags */
 	return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
 }

 static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
 					 unsigned int enabled)
 {
 	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);

 	return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
 }

 static int pcf85363_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
 	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
 	int ret;

 	buf[0] = bin2bcd(alrm->time.tm_sec);
 	buf[1] = bin2bcd(alrm->time.tm_min);
 	buf[2] = bin2bcd(alrm->time.tm_hour);
 	buf[3] = bin2bcd(alrm->time.tm_mday);
 	buf[4] = bin2bcd(alrm->time.tm_mon + 1);

 	/*
 	 * Disable the alarm interrupt before changing the value to avoid
 	 * spurious interrupts
 	 */
 	ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
 	if (ret)
 		return ret;

 	ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
 				sizeof(buf));
 	if (ret)
 		return ret;

 	return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
 }

 static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
 {
 	struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
 	unsigned int flags;
 	int err;

 	err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
 	if (err)
 		return IRQ_NONE;

 	if (flags & FLAGS_A1F) {
 		rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF | RTC_AF);
 		regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
 		return IRQ_HANDLED;
 	}

 	return IRQ_NONE;
 }

 static const struct rtc_class_ops rtc_ops = {
 	.read_time	= pcf85363_rtc_read_time,
 	.set_time	= pcf85363_rtc_set_time,
 	.read_alarm	= pcf85363_rtc_read_alarm,
 	.set_alarm	= pcf85363_rtc_set_alarm,
 	.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
 };

 static int pcf85363_nvram_read(void *priv, unsigned int offset, void *val,
 			       size_t bytes)
 {
 	struct pcf85363 *pcf85363 = priv;

 	return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset,
 				val, bytes);
 }

 static int pcf85363_nvram_write(void *priv, unsigned int offset, void *val,
 				size_t bytes)
 {
 	struct pcf85363 *pcf85363 = priv;

 	return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset,
 				 val, bytes);
 }

 static int pcf85x63_nvram_read(void *priv, unsigned int offset, void *val,
 			       size_t bytes)
 {
 	struct pcf85363 *pcf85363 = priv;
 	unsigned int tmp_val;
 	int ret;

 	ret = regmap_read(pcf85363->regmap, CTRL_RAMBYTE, &tmp_val);
 	(*(unsigned char *) val) = (unsigned char) tmp_val;

 	return ret;
 }

 static int pcf85x63_nvram_write(void *priv, unsigned int offset, void *val,
 				size_t bytes)
 {
 	struct pcf85363 *pcf85363 = priv;
 	unsigned char tmp_val;

 	tmp_val = *((unsigned char *)val);
 	return regmap_write(pcf85363->regmap, CTRL_RAMBYTE,
 				(unsigned int)tmp_val);
 }

 static const struct pcf85x63_config pcf_85263_config = {
 	.regmap = {
 		.reg_bits = 8,
 		.val_bits = 8,
 		.max_register = 0x2f,
 	},
 	.num_nvram = 1
 };

 static const struct pcf85x63_config pcf_85363_config = {
 	.regmap = {
 		.reg_bits = 8,
 		.val_bits = 8,
 		.max_register = 0x7f,
 	},
 	.num_nvram = 2
 };

 static int pcf85363_probe(struct i2c_client *client)
 {
 	struct pcf85363 *pcf85363;
 	const struct pcf85x63_config *config = &pcf_85363_config;
 	const void *data = of_device_get_match_data(&client->dev);
 	static struct nvmem_config nvmem_cfg[] = {
 		{
 			.name = "pcf85x63-",
 			.word_size = 1,
 			.stride = 1,
 			.size = 1,
 			.reg_read = pcf85x63_nvram_read,
 			.reg_write = pcf85x63_nvram_write,
 		}, {
 			.name = "pcf85363-",
 			.word_size = 1,
 			.stride = 1,
 			.size = NVRAM_SIZE,
 			.reg_read = pcf85363_nvram_read,
 			.reg_write = pcf85363_nvram_write,
 		},
 	};
 	int ret, i, err;

 	if (data)
 		config = data;

 	pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363),
 				GFP_KERNEL);
 	if (!pcf85363)
 		return -ENOMEM;

 	pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap);
 	if (IS_ERR(pcf85363->regmap)) {
 		dev_err(&client->dev, "regmap allocation failed\n");
 		return PTR_ERR(pcf85363->regmap);
 	}

 	i2c_set_clientdata(client, pcf85363);

 	pcf85363->rtc = devm_rtc_allocate_device(&client->dev);
 	if (IS_ERR(pcf85363->rtc))
 		return PTR_ERR(pcf85363->rtc);

 	err = pcf85363_load_capacitance(pcf85363, client->dev.of_node);
 	if (err < 0)
 		dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
 			 err);

 	pcf85363->rtc->ops = &rtc_ops;
 	pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;
 	clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);

 	if (client->irq > 0) {
 		unsigned long irqflags = IRQF_TRIGGER_LOW;

 		if (dev_fwnode(&client->dev))
 			irqflags = 0;

 		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
 		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
 				   PIN_IO_INTA_OUT, PIN_IO_INTAPM);
 		ret = devm_request_threaded_irq(&client->dev, client->irq,
 						NULL, pcf85363_rtc_handle_irq,
 						irqflags | IRQF_ONESHOT,
 						"pcf85363", client);
 		if (ret)
 			dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 		else
 			set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
 	}

 	ret = devm_rtc_register_device(pcf85363->rtc);

 	for (i = 0; i < config->num_nvram; i++) {
 		nvmem_cfg[i].priv = pcf85363;
 		devm_rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg[i]);
 	}

 	return ret;
 }

 static const __maybe_unused struct of_device_id dev_ids[] = {
 	{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
 	{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dev_ids);

 static struct i2c_driver pcf85363_driver = {
 	.driver	= {
 		.name	= "pcf85363",
 		.of_match_table = of_match_ptr(dev_ids),
 	},
 	.probe_new = pcf85363_probe,
 };

 module_i2c_driver(pcf85363_driver);

 MODULE_AUTHOR("Eric Nelson");
 MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* drivers/rtc/rtc-pcf85363.c
	*
	* Driver for NXP PCF85363 real-time clock.
	*
	* Copyright (C) 2017 Eric Nelson
	*/
	#include <linux/module.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>
	#include <linux/rtc.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/bcd.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>

	/*
	* Date/Time registers
	*/
	#define DT_100THS 0x00
	#define DT_SECS 0x01
	#define DT_MINUTES 0x02
	#define DT_HOURS 0x03
	#define DT_DAYS 0x04
	#define DT_WEEKDAYS 0x05
	#define DT_MONTHS 0x06
	#define DT_YEARS 0x07

	/*
	* Alarm registers
	*/
	#define DT_SECOND_ALM1 0x08
	#define DT_MINUTE_ALM1 0x09
	#define DT_HOUR_ALM1 0x0a
	#define DT_DAY_ALM1 0x0b
	#define DT_MONTH_ALM1 0x0c
	#define DT_MINUTE_ALM2 0x0d
	#define DT_HOUR_ALM2 0x0e
	#define DT_WEEKDAY_ALM2 0x0f
	#define DT_ALARM_EN 0x10

	/*
	* Time stamp registers
	*/
	#define DT_TIMESTAMP1 0x11
	#define DT_TIMESTAMP2 0x17
	#define DT_TIMESTAMP3 0x1d
	#define DT_TS_MODE 0x23

	/*
	* control registers
	*/
	#define CTRL_OFFSET 0x24
	#define CTRL_OSCILLATOR 0x25
	#define CTRL_BATTERY 0x26
	#define CTRL_PIN_IO 0x27
	#define CTRL_FUNCTION 0x28
	#define CTRL_INTA_EN 0x29
	#define CTRL_INTB_EN 0x2a
	#define CTRL_FLAGS 0x2b
	#define CTRL_RAMBYTE 0x2c
	#define CTRL_WDOG 0x2d
	#define CTRL_STOP_EN 0x2e
	#define CTRL_RESETS 0x2f
	#define CTRL_RAM 0x40

	#define ALRM_SEC_A1E BIT(0)
	#define ALRM_MIN_A1E BIT(1)
	#define ALRM_HR_A1E BIT(2)
	#define ALRM_DAY_A1E BIT(3)
	#define ALRM_MON_A1E BIT(4)
	#define ALRM_MIN_A2E BIT(5)
	#define ALRM_HR_A2E BIT(6)
	#define ALRM_DAY_A2E BIT(7)

	#define INT_WDIE BIT(0)
	#define INT_BSIE BIT(1)
	#define INT_TSRIE BIT(2)
	#define INT_A2IE BIT(3)
	#define INT_A1IE BIT(4)
	#define INT_OIE BIT(5)
	#define INT_PIE BIT(6)
	#define INT_ILP BIT(7)

	#define FLAGS_TSR1F BIT(0)
	#define FLAGS_TSR2F BIT(1)
	#define FLAGS_TSR3F BIT(2)
	#define FLAGS_BSF BIT(3)
	#define FLAGS_WDF BIT(4)
	#define FLAGS_A1F BIT(5)
	#define FLAGS_A2F BIT(6)
	#define FLAGS_PIF BIT(7)

	#define PIN_IO_INTAPM GENMASK(1, 0)
	#define PIN_IO_INTA_CLK 0
	#define PIN_IO_INTA_BAT 1
	#define PIN_IO_INTA_OUT 2
	#define PIN_IO_INTA_HIZ 3

	#define OSC_CAP_SEL GENMASK(1, 0)
	#define OSC_CAP_6000 0x01
	#define OSC_CAP_12500 0x02

	#define STOP_EN_STOP BIT(0)

	#define RESET_CPR 0xa4

	#define NVRAM_SIZE 0x40

	struct pcf85363 {
	struct rtc_device *rtc;
	struct regmap *regmap;
	};

	struct pcf85x63_config {
	struct regmap_config regmap;
	unsigned int num_nvram;
	};

	static int pcf85363_load_capacitance(struct pcf85363 pcf85363, struct device_node node)
	{
	u32 load = 7000;
	u8 value = 0;

	of_property_read_u32(node, "quartz-load-femtofarads", &load);

	switch (load) {
	default:
	dev_warn(&pcf85363->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
	load);
	fallthrough;
	case 7000:
	break;
	case 6000:
	value = OSC_CAP_6000;
	break;
	case 12500:
	value = OSC_CAP_12500;
	break;
	}

	return regmap_update_bits(pcf85363->regmap, CTRL_OSCILLATOR,
	OSC_CAP_SEL, value);
	}

	static int pcf85363_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char buf[DT_YEARS + 1];
	int ret, len = sizeof(buf);

	/* read the RTC date and time registers all at once */
	ret = regmap_bulk_read(pcf85363->regmap, DT_100THS, buf, len);
	if (ret) {
	dev_err(dev, "%s: error %d\n", __func__, ret);
	return ret;
	}

	tm->tm_year = bcd2bin(buf[DT_YEARS]);
	/* adjust for 1900 base of rtc_time */
	tm->tm_year += 100;

	tm->tm_wday = buf[DT_WEEKDAYS] & 7;
	buf[DT_SECS] &= 0x7F;
	tm->tm_sec = bcd2bin(buf[DT_SECS]);
	buf[DT_MINUTES] &= 0x7F;
	tm->tm_min = bcd2bin(buf[DT_MINUTES]);
	tm->tm_hour = bcd2bin(buf[DT_HOURS]);
	tm->tm_mday = bcd2bin(buf[DT_DAYS]);
	tm->tm_mon = bcd2bin(buf[DT_MONTHS]) - 1;

	return 0;
	}

	static int pcf85363_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char tmp[11];
	unsigned char *buf = &tmp[2];
	int ret;

	tmp[0] = STOP_EN_STOP;
	tmp[1] = RESET_CPR;

	buf[DT_100THS] = 0;
	buf[DT_SECS] = bin2bcd(tm->tm_sec);
	buf[DT_MINUTES] = bin2bcd(tm->tm_min);
	buf[DT_HOURS] = bin2bcd(tm->tm_hour);
	buf[DT_DAYS] = bin2bcd(tm->tm_mday);
	buf[DT_WEEKDAYS] = tm->tm_wday;
	buf[DT_MONTHS] = bin2bcd(tm->tm_mon + 1);
	buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);

	ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
	tmp, 2);
	if (ret)
	return ret;

	ret = regmap_bulk_write(pcf85363->regmap, DT_100THS,
	buf, sizeof(tmp) - 2);
	if (ret)
	return ret;

	return regmap_write(pcf85363->regmap, CTRL_STOP_EN, 0);
	}

	static int pcf85363_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
	unsigned int val;
	int ret;

	ret = regmap_bulk_read(pcf85363->regmap, DT_SECOND_ALM1, buf,
	sizeof(buf));
	if (ret)
	return ret;

	alrm->time.tm_sec = bcd2bin(buf[0]);
	alrm->time.tm_min = bcd2bin(buf[1]);
	alrm->time.tm_hour = bcd2bin(buf[2]);
	alrm->time.tm_mday = bcd2bin(buf[3]);
	alrm->time.tm_mon = bcd2bin(buf[4]) - 1;

	ret = regmap_read(pcf85363->regmap, CTRL_INTA_EN, &val);
	if (ret)
	return ret;

	alrm->enabled = !!(val & INT_A1IE);

	return 0;
	}

	static int _pcf85363_rtc_alarm_irq_enable(struct pcf85363 *pcf85363, unsigned
	int enabled)
	{
	unsigned int alarm_flags = ALRM_SEC_A1E \| ALRM_MIN_A1E \| ALRM_HR_A1E \|
	ALRM_DAY_A1E \| ALRM_MON_A1E;
	int ret;

	ret = regmap_update_bits(pcf85363->regmap, DT_ALARM_EN, alarm_flags,
	enabled ? alarm_flags : 0);
	if (ret)
	return ret;

	ret = regmap_update_bits(pcf85363->regmap, CTRL_INTA_EN,
	INT_A1IE, enabled ? INT_A1IE : 0);

	if (ret \|\| enabled)
	return ret;

	/* clear current flags */
	return regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
	}

	static int pcf85363_rtc_alarm_irq_enable(struct device *dev,
	unsigned int enabled)
	{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);

	return _pcf85363_rtc_alarm_irq_enable(pcf85363, enabled);
	}

	static int pcf85363_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
	unsigned char buf[DT_MONTH_ALM1 - DT_SECOND_ALM1 + 1];
	int ret;

	buf[0] = bin2bcd(alrm->time.tm_sec);
	buf[1] = bin2bcd(alrm->time.tm_min);
	buf[2] = bin2bcd(alrm->time.tm_hour);
	buf[3] = bin2bcd(alrm->time.tm_mday);
	buf[4] = bin2bcd(alrm->time.tm_mon + 1);

	/*
	* Disable the alarm interrupt before changing the value to avoid
	* spurious interrupts
	*/
	ret = _pcf85363_rtc_alarm_irq_enable(pcf85363, 0);
	if (ret)
	return ret;

	ret = regmap_bulk_write(pcf85363->regmap, DT_SECOND_ALM1, buf,
	sizeof(buf));
	if (ret)
	return ret;

	return _pcf85363_rtc_alarm_irq_enable(pcf85363, alrm->enabled);
	}

	static irqreturn_t pcf85363_rtc_handle_irq(int irq, void *dev_id)
	{
	struct pcf85363 *pcf85363 = i2c_get_clientdata(dev_id);
	unsigned int flags;
	int err;

	err = regmap_read(pcf85363->regmap, CTRL_FLAGS, &flags);
	if (err)
	return IRQ_NONE;

	if (flags & FLAGS_A1F) {
	rtc_update_irq(pcf85363->rtc, 1, RTC_IRQF \| RTC_AF);
	regmap_update_bits(pcf85363->regmap, CTRL_FLAGS, FLAGS_A1F, 0);
	return IRQ_HANDLED;
	}

	return IRQ_NONE;
	}

	static const struct rtc_class_ops rtc_ops = {
	.read_time = pcf85363_rtc_read_time,
	.set_time = pcf85363_rtc_set_time,
	.read_alarm = pcf85363_rtc_read_alarm,
	.set_alarm = pcf85363_rtc_set_alarm,
	.alarm_irq_enable = pcf85363_rtc_alarm_irq_enable,
	};

	static int pcf85363_nvram_read(void priv, unsigned int offset, void val,
	size_t bytes)
	{
	struct pcf85363 *pcf85363 = priv;

	return regmap_bulk_read(pcf85363->regmap, CTRL_RAM + offset,
	val, bytes);
	}

	static int pcf85363_nvram_write(void priv, unsigned int offset, void val,
	size_t bytes)
	{
	struct pcf85363 *pcf85363 = priv;

	return regmap_bulk_write(pcf85363->regmap, CTRL_RAM + offset,
	val, bytes);
	}

	static int pcf85x63_nvram_read(void priv, unsigned int offset, void val,
	size_t bytes)
	{
	struct pcf85363 *pcf85363 = priv;
	unsigned int tmp_val;
	int ret;

	ret = regmap_read(pcf85363->regmap, CTRL_RAMBYTE, &tmp_val);
	((unsigned char ) val) = (unsigned char) tmp_val;

	return ret;
	}

	static int pcf85x63_nvram_write(void priv, unsigned int offset, void val,
	size_t bytes)
	{
	struct pcf85363 *pcf85363 = priv;
	unsigned char tmp_val;

	tmp_val = ((unsigned char )val);
	return regmap_write(pcf85363->regmap, CTRL_RAMBYTE,
	(unsigned int)tmp_val);
	}

	static const struct pcf85x63_config pcf_85263_config = {
	.regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x2f,
	},
	.num_nvram = 1
	};

	static const struct pcf85x63_config pcf_85363_config = {
	.regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 0x7f,
	},
	.num_nvram = 2
	};

	static int pcf85363_probe(struct i2c_client *client)
	{
	struct pcf85363 *pcf85363;
	const struct pcf85x63_config *config = &pcf_85363_config;
	const void *data = of_device_get_match_data(&client->dev);
	static struct nvmem_config nvmem_cfg[] = {
	{
	.name = "pcf85x63-",
	.word_size = 1,
	.stride = 1,
	.size = 1,
	.reg_read = pcf85x63_nvram_read,
	.reg_write = pcf85x63_nvram_write,
	}, {
	.name = "pcf85363-",
	.word_size = 1,
	.stride = 1,
	.size = NVRAM_SIZE,
	.reg_read = pcf85363_nvram_read,
	.reg_write = pcf85363_nvram_write,
	},
	};
	int ret, i, err;

	if (data)
	config = data;

	pcf85363 = devm_kzalloc(&client->dev, sizeof(struct pcf85363),
	GFP_KERNEL);
	if (!pcf85363)
	return -ENOMEM;

	pcf85363->regmap = devm_regmap_init_i2c(client, &config->regmap);
	if (IS_ERR(pcf85363->regmap)) {
	dev_err(&client->dev, "regmap allocation failed\n");
	return PTR_ERR(pcf85363->regmap);
	}

	i2c_set_clientdata(client, pcf85363);

	pcf85363->rtc = devm_rtc_allocate_device(&client->dev);
	if (IS_ERR(pcf85363->rtc))
	return PTR_ERR(pcf85363->rtc);

	err = pcf85363_load_capacitance(pcf85363, client->dev.of_node);
	if (err < 0)
	dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
	err);

	pcf85363->rtc->ops = &rtc_ops;
	pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;
	clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);

	if (client->irq > 0) {
	unsigned long irqflags = IRQF_TRIGGER_LOW;

	if (dev_fwnode(&client->dev))
	irqflags = 0;

	regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
	regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
	PIN_IO_INTA_OUT, PIN_IO_INTAPM);
	ret = devm_request_threaded_irq(&client->dev, client->irq,
	NULL, pcf85363_rtc_handle_irq,
	irqflags \| IRQF_ONESHOT,
	"pcf85363", client);
	if (ret)
	dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
	else
	set_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features);
	}

	ret = devm_rtc_register_device(pcf85363->rtc);

	for (i = 0; i < config->num_nvram; i++) {
	nvmem_cfg[i].priv = pcf85363;
	devm_rtc_nvmem_register(pcf85363->rtc, &nvmem_cfg[i]);
	}

	return ret;
	}

	static const __maybe_unused struct of_device_id dev_ids[] = {
	{ .compatible = "nxp,pcf85263", .data = &pcf_85263_config },
	{ .compatible = "nxp,pcf85363", .data = &pcf_85363_config },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, dev_ids);

	static struct i2c_driver pcf85363_driver = {
	.driver = {
	.name = "pcf85363",
	.of_match_table = of_match_ptr(dev_ids),
	},
	.probe_new = pcf85363_probe,
	};

	module_i2c_driver(pcf85363_driver);

	MODULE_AUTHOR("Eric Nelson");
	MODULE_DESCRIPTION("pcf85263/pcf85363 I2C RTC driver");
	MODULE_LICENSE("GPL");