drivers/rtc/rtc-da9063.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Real time clock device driver for DA9063
  * Copyright (C) 2013-2015  Dialog Semiconductor Ltd.
  */

 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_wakeirq.h>
 #include <linux/regmap.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>

 #include <linux/mfd/da9062/registers.h>
 #include <linux/mfd/da9063/registers.h>
 #include <linux/mfd/da9063/core.h>

 #define YEARS_TO_DA9063(year)		((year) - 100)
 #define MONTHS_TO_DA9063(month)		((month) + 1)
 #define YEARS_FROM_DA9063(year)		((year) + 100)
 #define MONTHS_FROM_DA9063(month)	((month) - 1)

 enum {
 	RTC_SEC	= 0,
 	RTC_MIN	= 1,
 	RTC_HOUR = 2,
 	RTC_DAY	= 3,
 	RTC_MONTH = 4,
 	RTC_YEAR = 5,
 	RTC_DATA_LEN
 };

 struct da9063_compatible_rtc_regmap {
 	/* REGS */
 	int rtc_enable_reg;
 	int rtc_enable_32k_crystal_reg;
 	int rtc_alarm_secs_reg;
 	int rtc_alarm_year_reg;
 	int rtc_count_secs_reg;
 	int rtc_count_year_reg;
 	int rtc_event_reg;
 	/* MASKS */
 	int rtc_enable_mask;
 	int rtc_crystal_mask;
 	int rtc_event_alarm_mask;
 	int rtc_alarm_on_mask;
 	int rtc_alarm_status_mask;
 	int rtc_tick_on_mask;
 	int rtc_ready_to_read_mask;
 	int rtc_count_sec_mask;
 	int rtc_count_min_mask;
 	int rtc_count_hour_mask;
 	int rtc_count_day_mask;
 	int rtc_count_month_mask;
 	int rtc_count_year_mask;
 	/* ALARM CONFIG */
 	int rtc_data_start;
 	int rtc_alarm_len;
 };

 struct da9063_compatible_rtc {
 	struct rtc_device *rtc_dev;
 	struct rtc_time alarm_time;
 	struct regmap *regmap;
 	const struct da9063_compatible_rtc_regmap *config;
 	bool rtc_sync;
 };

 static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
 	/* REGS */
 	.rtc_enable_reg             = DA9063_REG_CONTROL_E,
 	.rtc_alarm_secs_reg         = DA9063_AD_REG_ALARM_MI,
 	.rtc_alarm_year_reg         = DA9063_AD_REG_ALARM_Y,
 	.rtc_count_secs_reg         = DA9063_REG_COUNT_S,
 	.rtc_count_year_reg         = DA9063_REG_COUNT_Y,
 	.rtc_event_reg              = DA9063_REG_EVENT_A,
 	/* MASKS */
 	.rtc_enable_mask            = DA9063_RTC_EN,
 	.rtc_crystal_mask           = DA9063_CRYSTAL,
 	.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
 	.rtc_event_alarm_mask       = DA9063_E_ALARM,
 	.rtc_alarm_on_mask          = DA9063_ALARM_ON,
 	.rtc_alarm_status_mask      = DA9063_ALARM_STATUS_ALARM |
 				      DA9063_ALARM_STATUS_TICK,
 	.rtc_tick_on_mask           = DA9063_TICK_ON,
 	.rtc_ready_to_read_mask     = DA9063_RTC_READ,
 	.rtc_count_sec_mask         = DA9063_COUNT_SEC_MASK,
 	.rtc_count_min_mask         = DA9063_COUNT_MIN_MASK,
 	.rtc_count_hour_mask        = DA9063_COUNT_HOUR_MASK,
 	.rtc_count_day_mask         = DA9063_COUNT_DAY_MASK,
 	.rtc_count_month_mask       = DA9063_COUNT_MONTH_MASK,
 	.rtc_count_year_mask        = DA9063_COUNT_YEAR_MASK,
 	/* ALARM CONFIG */
 	.rtc_data_start             = RTC_MIN,
 	.rtc_alarm_len              = RTC_DATA_LEN - 1,
 };

 static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
 	/* REGS */
 	.rtc_enable_reg             = DA9063_REG_CONTROL_E,
 	.rtc_alarm_secs_reg         = DA9063_BB_REG_ALARM_S,
 	.rtc_alarm_year_reg         = DA9063_BB_REG_ALARM_Y,
 	.rtc_count_secs_reg         = DA9063_REG_COUNT_S,
 	.rtc_count_year_reg         = DA9063_REG_COUNT_Y,
 	.rtc_event_reg              = DA9063_REG_EVENT_A,
 	/* MASKS */
 	.rtc_enable_mask            = DA9063_RTC_EN,
 	.rtc_crystal_mask           = DA9063_CRYSTAL,
 	.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
 	.rtc_event_alarm_mask       = DA9063_E_ALARM,
 	.rtc_alarm_on_mask          = DA9063_ALARM_ON,
 	.rtc_alarm_status_mask      = DA9063_ALARM_STATUS_ALARM |
 				      DA9063_ALARM_STATUS_TICK,
 	.rtc_tick_on_mask           = DA9063_TICK_ON,
 	.rtc_ready_to_read_mask     = DA9063_RTC_READ,
 	.rtc_count_sec_mask         = DA9063_COUNT_SEC_MASK,
 	.rtc_count_min_mask         = DA9063_COUNT_MIN_MASK,
 	.rtc_count_hour_mask        = DA9063_COUNT_HOUR_MASK,
 	.rtc_count_day_mask         = DA9063_COUNT_DAY_MASK,
 	.rtc_count_month_mask       = DA9063_COUNT_MONTH_MASK,
 	.rtc_count_year_mask        = DA9063_COUNT_YEAR_MASK,
 	/* ALARM CONFIG */
 	.rtc_data_start             = RTC_SEC,
 	.rtc_alarm_len              = RTC_DATA_LEN,
 };

 static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
 	/* REGS */
 	.rtc_enable_reg             = DA9062AA_CONTROL_E,
 	.rtc_alarm_secs_reg         = DA9062AA_ALARM_S,
 	.rtc_alarm_year_reg         = DA9062AA_ALARM_Y,
 	.rtc_count_secs_reg         = DA9062AA_COUNT_S,
 	.rtc_count_year_reg         = DA9062AA_COUNT_Y,
 	.rtc_event_reg              = DA9062AA_EVENT_A,
 	/* MASKS */
 	.rtc_enable_mask            = DA9062AA_RTC_EN_MASK,
 	.rtc_crystal_mask           = DA9062AA_CRYSTAL_MASK,
 	.rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
 	.rtc_event_alarm_mask       = DA9062AA_M_ALARM_MASK,
 	.rtc_alarm_on_mask          = DA9062AA_ALARM_ON_MASK,
 	.rtc_alarm_status_mask      = (0x02 << 6),
 	.rtc_tick_on_mask           = DA9062AA_TICK_ON_MASK,
 	.rtc_ready_to_read_mask     = DA9062AA_RTC_READ_MASK,
 	.rtc_count_sec_mask         = DA9062AA_COUNT_SEC_MASK,
 	.rtc_count_min_mask         = DA9062AA_COUNT_MIN_MASK,
 	.rtc_count_hour_mask        = DA9062AA_COUNT_HOUR_MASK,
 	.rtc_count_day_mask         = DA9062AA_COUNT_DAY_MASK,
 	.rtc_count_month_mask       = DA9062AA_COUNT_MONTH_MASK,
 	.rtc_count_year_mask        = DA9062AA_COUNT_YEAR_MASK,
 	/* ALARM CONFIG */
 	.rtc_data_start             = RTC_SEC,
 	.rtc_alarm_len              = RTC_DATA_LEN,
 };

 static const struct of_device_id da9063_compatible_reg_id_table[] = {
 	{ .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
 	{ .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);

 static void da9063_data_to_tm(u8 *data, struct rtc_time *tm,
 			      struct da9063_compatible_rtc *rtc)
 {
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;

 	tm->tm_sec  = data[RTC_SEC]  & config->rtc_count_sec_mask;
 	tm->tm_min  = data[RTC_MIN]  & config->rtc_count_min_mask;
 	tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
 	tm->tm_mday = data[RTC_DAY]  & config->rtc_count_day_mask;
 	tm->tm_mon  = MONTHS_FROM_DA9063(data[RTC_MONTH] &
 					 config->rtc_count_month_mask);
 	tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
 					config->rtc_count_year_mask);
 }

 static void da9063_tm_to_data(struct rtc_time *tm, u8 *data,
 			      struct da9063_compatible_rtc *rtc)
 {
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;

 	data[RTC_SEC]   = tm->tm_sec & config->rtc_count_sec_mask;
 	data[RTC_MIN]   = tm->tm_min & config->rtc_count_min_mask;
 	data[RTC_HOUR]  = tm->tm_hour & config->rtc_count_hour_mask;
 	data[RTC_DAY]   = tm->tm_mday & config->rtc_count_day_mask;
 	data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) &
 				config->rtc_count_month_mask;
 	data[RTC_YEAR]  = YEARS_TO_DA9063(tm->tm_year) &
 				config->rtc_count_year_mask;
 }

 static int da9063_rtc_stop_alarm(struct device *dev)
 {
 	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;

 	return regmap_update_bits(rtc->regmap,
 				  config->rtc_alarm_year_reg,
 				  config->rtc_alarm_on_mask,
 				  0);
 }

 static int da9063_rtc_start_alarm(struct device *dev)
 {
 	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;

 	return regmap_update_bits(rtc->regmap,
 				  config->rtc_alarm_year_reg,
 				  config->rtc_alarm_on_mask,
 				  config->rtc_alarm_on_mask);
 }

 static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;
 	unsigned long tm_secs;
 	unsigned long al_secs;
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	ret = regmap_bulk_read(rtc->regmap,
 			       config->rtc_count_secs_reg,
 			       data, RTC_DATA_LEN);
 	if (ret < 0) {
 		dev_err(dev, "Failed to read RTC time data: %d\n", ret);
 		return ret;
 	}

 	if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
 		dev_dbg(dev, "RTC not yet ready to be read by the host\n");
 		return -EINVAL;
 	}

 	da9063_data_to_tm(data, tm, rtc);

 	tm_secs = rtc_tm_to_time64(tm);
 	al_secs = rtc_tm_to_time64(&rtc->alarm_time);

 	/* handle the rtc synchronisation delay */
 	if (rtc->rtc_sync && al_secs - tm_secs == 1)
 		memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
 	else
 		rtc->rtc_sync = false;

 	return 0;
 }

 static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	da9063_tm_to_data(tm, data, rtc);
 	ret = regmap_bulk_write(rtc->regmap,
 				config->rtc_count_secs_reg,
 				data, RTC_DATA_LEN);
 	if (ret < 0)
 		dev_err(dev, "Failed to set RTC time data: %d\n", ret);

 	return ret;
 }

 static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;
 	u8 data[RTC_DATA_LEN];
 	int ret;
 	unsigned int val;

 	data[RTC_SEC] = 0;
 	ret = regmap_bulk_read(rtc->regmap,
 			       config->rtc_alarm_secs_reg,
 			       &data[config->rtc_data_start],
 			       config->rtc_alarm_len);
 	if (ret < 0)
 		return ret;

 	da9063_data_to_tm(data, &alrm->time, rtc);

 	alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);

 	ret = regmap_read(rtc->regmap,
 			  config->rtc_event_reg,
 			  &val);
 	if (ret < 0)
 		return ret;

 	if (val & config->rtc_event_alarm_mask)
 		alrm->pending = 1;
 	else
 		alrm->pending = 0;

 	return 0;
 }

 static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	da9063_tm_to_data(&alrm->time, data, rtc);

 	ret = da9063_rtc_stop_alarm(dev);
 	if (ret < 0) {
 		dev_err(dev, "Failed to stop alarm: %d\n", ret);
 		return ret;
 	}

 	ret = regmap_bulk_write(rtc->regmap,
 				config->rtc_alarm_secs_reg,
 				&data[config->rtc_data_start],
 				config->rtc_alarm_len);
 	if (ret < 0) {
 		dev_err(dev, "Failed to write alarm: %d\n", ret);
 		return ret;
 	}

 	da9063_data_to_tm(data, &rtc->alarm_time, rtc);

 	if (alrm->enabled) {
 		ret = da9063_rtc_start_alarm(dev);
 		if (ret < 0) {
 			dev_err(dev, "Failed to start alarm: %d\n", ret);
 			return ret;
 		}
 	}

 	return ret;
 }

 static int da9063_rtc_alarm_irq_enable(struct device *dev,
 				       unsigned int enabled)
 {
 	if (enabled)
 		return da9063_rtc_start_alarm(dev);
 	else
 		return da9063_rtc_stop_alarm(dev);
 }

 static irqreturn_t da9063_alarm_event(int irq, void *data)
 {
 	struct da9063_compatible_rtc *rtc = data;
 	const struct da9063_compatible_rtc_regmap *config = rtc->config;

 	regmap_update_bits(rtc->regmap,
 			   config->rtc_alarm_year_reg,
 			   config->rtc_alarm_on_mask,
 			   0);

 	rtc->rtc_sync = true;
 	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);

 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops da9063_rtc_ops = {
 	.read_time = da9063_rtc_read_time,
 	.set_time = da9063_rtc_set_time,
 	.read_alarm = da9063_rtc_read_alarm,
 	.set_alarm = da9063_rtc_set_alarm,
 	.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
 };

 static int da9063_rtc_probe(struct platform_device *pdev)
 {
 	struct da9063_compatible_rtc *rtc;
 	const struct da9063_compatible_rtc_regmap *config;
 	const struct of_device_id *match;
 	int irq_alarm;
 	u8 data[RTC_DATA_LEN];
 	int ret;

 	if (!pdev->dev.of_node)
 		return -ENXIO;

 	match = of_match_node(da9063_compatible_reg_id_table,
 			      pdev->dev.of_node);

 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 	if (!rtc)
 		return -ENOMEM;

 	rtc->config = match->data;
 	if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
 		struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);

 		if (chip->variant_code == PMIC_DA9063_AD)
 			rtc->config = &da9063_ad_regs;
 	}

 	rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!rtc->regmap) {
 		dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
 		return -ENXIO;
 	}

 	config = rtc->config;
 	ret = regmap_update_bits(rtc->regmap,
 				 config->rtc_enable_reg,
 				 config->rtc_enable_mask,
 				 config->rtc_enable_mask);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to enable RTC\n");
 		return ret;
 	}

 	ret = regmap_update_bits(rtc->regmap,
 				 config->rtc_enable_32k_crystal_reg,
 				 config->rtc_crystal_mask,
 				 config->rtc_crystal_mask);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
 		return ret;
 	}

 	ret = regmap_update_bits(rtc->regmap,
 				 config->rtc_alarm_secs_reg,
 				 config->rtc_alarm_status_mask,
 				 0);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
 		return ret;
 	}

 	ret = regmap_update_bits(rtc->regmap,
 				 config->rtc_alarm_secs_reg,
 				 DA9063_ALARM_STATUS_ALARM,
 				 DA9063_ALARM_STATUS_ALARM);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
 		return ret;
 	}

 	ret = regmap_update_bits(rtc->regmap,
 				 config->rtc_alarm_year_reg,
 				 config->rtc_tick_on_mask,
 				 0);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to disable TICKs\n");
 		return ret;
 	}

 	data[RTC_SEC] = 0;
 	ret = regmap_bulk_read(rtc->regmap,
 			       config->rtc_alarm_secs_reg,
 			       &data[config->rtc_data_start],
 			       config->rtc_alarm_len);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
 			ret);
 		return ret;
 	}

 	platform_set_drvdata(pdev, rtc);

 	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(rtc->rtc_dev))
 		return PTR_ERR(rtc->rtc_dev);

 	rtc->rtc_dev->ops = &da9063_rtc_ops;
 	rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_2063;

 	da9063_data_to_tm(data, &rtc->alarm_time, rtc);
 	rtc->rtc_sync = false;

 	if (config->rtc_data_start != RTC_SEC) {
 		set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtc_dev->features);
 		/*
 		 * TODO: some models have alarms on a minute boundary but still
 		 * support real hardware interrupts.
 		 */
 		clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtc_dev->features);
 	}

 	irq_alarm = platform_get_irq_byname(pdev, "ALARM");
 	if (irq_alarm < 0)
 		return irq_alarm;

 	ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
 					da9063_alarm_event,
 					IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 					"ALARM", rtc);
 	if (ret)
 		dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
 			irq_alarm, ret);

 	ret = dev_pm_set_wake_irq(&pdev->dev, irq_alarm);
 	if (ret)
 		dev_warn(&pdev->dev,
 			 "Failed to set IRQ %d as a wake IRQ: %d\n",
 			 irq_alarm, ret);

 	device_init_wakeup(&pdev->dev, true);

 	return devm_rtc_register_device(rtc->rtc_dev);
 }

 static struct platform_driver da9063_rtc_driver = {
 	.probe		= da9063_rtc_probe,
 	.driver		= {
 		.name	= DA9063_DRVNAME_RTC,
 		.of_match_table = da9063_compatible_reg_id_table,
 	},
 };

 module_platform_driver(da9063_rtc_driver);

 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Real time clock device driver for DA9063
	* Copyright (C) 2013-2015 Dialog Semiconductor Ltd.
	*/

	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/pm_wakeirq.h>
	#include <linux/regmap.h>
	#include <linux/rtc.h>
	#include <linux/slab.h>

	#include <linux/mfd/da9062/registers.h>
	#include <linux/mfd/da9063/registers.h>
	#include <linux/mfd/da9063/core.h>

	#define YEARS_TO_DA9063(year) ((year) - 100)
	#define MONTHS_TO_DA9063(month) ((month) + 1)
	#define YEARS_FROM_DA9063(year) ((year) + 100)
	#define MONTHS_FROM_DA9063(month) ((month) - 1)

	enum {
	RTC_SEC = 0,
	RTC_MIN = 1,
	RTC_HOUR = 2,
	RTC_DAY = 3,
	RTC_MONTH = 4,
	RTC_YEAR = 5,
	RTC_DATA_LEN
	};

	struct da9063_compatible_rtc_regmap {
	/* REGS */
	int rtc_enable_reg;
	int rtc_enable_32k_crystal_reg;
	int rtc_alarm_secs_reg;
	int rtc_alarm_year_reg;
	int rtc_count_secs_reg;
	int rtc_count_year_reg;
	int rtc_event_reg;
	/* MASKS */
	int rtc_enable_mask;
	int rtc_crystal_mask;
	int rtc_event_alarm_mask;
	int rtc_alarm_on_mask;
	int rtc_alarm_status_mask;
	int rtc_tick_on_mask;
	int rtc_ready_to_read_mask;
	int rtc_count_sec_mask;
	int rtc_count_min_mask;
	int rtc_count_hour_mask;
	int rtc_count_day_mask;
	int rtc_count_month_mask;
	int rtc_count_year_mask;
	/* ALARM CONFIG */
	int rtc_data_start;
	int rtc_alarm_len;
	};

	struct da9063_compatible_rtc {
	struct rtc_device *rtc_dev;
	struct rtc_time alarm_time;
	struct regmap *regmap;
	const struct da9063_compatible_rtc_regmap *config;
	bool rtc_sync;
	};

	static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
	/* REGS */
	.rtc_enable_reg = DA9063_REG_CONTROL_E,
	.rtc_alarm_secs_reg = DA9063_AD_REG_ALARM_MI,
	.rtc_alarm_year_reg = DA9063_AD_REG_ALARM_Y,
	.rtc_count_secs_reg = DA9063_REG_COUNT_S,
	.rtc_count_year_reg = DA9063_REG_COUNT_Y,
	.rtc_event_reg = DA9063_REG_EVENT_A,
	/* MASKS */
	.rtc_enable_mask = DA9063_RTC_EN,
	.rtc_crystal_mask = DA9063_CRYSTAL,
	.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
	.rtc_event_alarm_mask = DA9063_E_ALARM,
	.rtc_alarm_on_mask = DA9063_ALARM_ON,
	.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM \|
	DA9063_ALARM_STATUS_TICK,
	.rtc_tick_on_mask = DA9063_TICK_ON,
	.rtc_ready_to_read_mask = DA9063_RTC_READ,
	.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
	.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
	.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
	.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
	.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
	.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
	/* ALARM CONFIG */
	.rtc_data_start = RTC_MIN,
	.rtc_alarm_len = RTC_DATA_LEN - 1,
	};

	static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
	/* REGS */
	.rtc_enable_reg = DA9063_REG_CONTROL_E,
	.rtc_alarm_secs_reg = DA9063_BB_REG_ALARM_S,
	.rtc_alarm_year_reg = DA9063_BB_REG_ALARM_Y,
	.rtc_count_secs_reg = DA9063_REG_COUNT_S,
	.rtc_count_year_reg = DA9063_REG_COUNT_Y,
	.rtc_event_reg = DA9063_REG_EVENT_A,
	/* MASKS */
	.rtc_enable_mask = DA9063_RTC_EN,
	.rtc_crystal_mask = DA9063_CRYSTAL,
	.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
	.rtc_event_alarm_mask = DA9063_E_ALARM,
	.rtc_alarm_on_mask = DA9063_ALARM_ON,
	.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM \|
	DA9063_ALARM_STATUS_TICK,
	.rtc_tick_on_mask = DA9063_TICK_ON,
	.rtc_ready_to_read_mask = DA9063_RTC_READ,
	.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
	.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
	.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
	.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
	.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
	.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
	/* ALARM CONFIG */
	.rtc_data_start = RTC_SEC,
	.rtc_alarm_len = RTC_DATA_LEN,
	};

	static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
	/* REGS */
	.rtc_enable_reg = DA9062AA_CONTROL_E,
	.rtc_alarm_secs_reg = DA9062AA_ALARM_S,
	.rtc_alarm_year_reg = DA9062AA_ALARM_Y,
	.rtc_count_secs_reg = DA9062AA_COUNT_S,
	.rtc_count_year_reg = DA9062AA_COUNT_Y,
	.rtc_event_reg = DA9062AA_EVENT_A,
	/* MASKS */
	.rtc_enable_mask = DA9062AA_RTC_EN_MASK,
	.rtc_crystal_mask = DA9062AA_CRYSTAL_MASK,
	.rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
	.rtc_event_alarm_mask = DA9062AA_M_ALARM_MASK,
	.rtc_alarm_on_mask = DA9062AA_ALARM_ON_MASK,
	.rtc_alarm_status_mask = (0x02 << 6),
	.rtc_tick_on_mask = DA9062AA_TICK_ON_MASK,
	.rtc_ready_to_read_mask = DA9062AA_RTC_READ_MASK,
	.rtc_count_sec_mask = DA9062AA_COUNT_SEC_MASK,
	.rtc_count_min_mask = DA9062AA_COUNT_MIN_MASK,
	.rtc_count_hour_mask = DA9062AA_COUNT_HOUR_MASK,
	.rtc_count_day_mask = DA9062AA_COUNT_DAY_MASK,
	.rtc_count_month_mask = DA9062AA_COUNT_MONTH_MASK,
	.rtc_count_year_mask = DA9062AA_COUNT_YEAR_MASK,
	/* ALARM CONFIG */
	.rtc_data_start = RTC_SEC,
	.rtc_alarm_len = RTC_DATA_LEN,
	};

	static const struct of_device_id da9063_compatible_reg_id_table[] = {
	{ .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
	{ .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
	{ },
	};
	MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);

	static void da9063_data_to_tm(u8 data, struct rtc_time tm,
	struct da9063_compatible_rtc *rtc)
	{
	const struct da9063_compatible_rtc_regmap *config = rtc->config;

	tm->tm_sec = data[RTC_SEC] & config->rtc_count_sec_mask;
	tm->tm_min = data[RTC_MIN] & config->rtc_count_min_mask;
	tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
	tm->tm_mday = data[RTC_DAY] & config->rtc_count_day_mask;
	tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
	config->rtc_count_month_mask);
	tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
	config->rtc_count_year_mask);
	}

	static void da9063_tm_to_data(struct rtc_time tm, u8 data,
	struct da9063_compatible_rtc *rtc)
	{
	const struct da9063_compatible_rtc_regmap *config = rtc->config;

	data[RTC_SEC] = tm->tm_sec & config->rtc_count_sec_mask;
	data[RTC_MIN] = tm->tm_min & config->rtc_count_min_mask;
	data[RTC_HOUR] = tm->tm_hour & config->rtc_count_hour_mask;
	data[RTC_DAY] = tm->tm_mday & config->rtc_count_day_mask;
	data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) &
	config->rtc_count_month_mask;
	data[RTC_YEAR] = YEARS_TO_DA9063(tm->tm_year) &
	config->rtc_count_year_mask;
	}

	static int da9063_rtc_stop_alarm(struct device *dev)
	{
	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
	const struct da9063_compatible_rtc_regmap *config = rtc->config;

	return regmap_update_bits(rtc->regmap,
	config->rtc_alarm_year_reg,
	config->rtc_alarm_on_mask,
	0);
	}

	static int da9063_rtc_start_alarm(struct device *dev)
	{
	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
	const struct da9063_compatible_rtc_regmap *config = rtc->config;

	return regmap_update_bits(rtc->regmap,
	config->rtc_alarm_year_reg,
	config->rtc_alarm_on_mask,
	config->rtc_alarm_on_mask);
	}

	static int da9063_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
	const struct da9063_compatible_rtc_regmap *config = rtc->config;
	unsigned long tm_secs;
	unsigned long al_secs;
	u8 data[RTC_DATA_LEN];
	int ret;

	ret = regmap_bulk_read(rtc->regmap,
	config->rtc_count_secs_reg,
	data, RTC_DATA_LEN);
	if (ret < 0) {
	dev_err(dev, "Failed to read RTC time data: %d\n", ret);
	return ret;
	}

	if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
	dev_dbg(dev, "RTC not yet ready to be read by the host\n");
	return -EINVAL;
	}

	da9063_data_to_tm(data, tm, rtc);

	tm_secs = rtc_tm_to_time64(tm);
	al_secs = rtc_tm_to_time64(&rtc->alarm_time);

	/* handle the rtc synchronisation delay */
	if (rtc->rtc_sync && al_secs - tm_secs == 1)
	memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
	else
	rtc->rtc_sync = false;

	return 0;
	}

	static int da9063_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
	const struct da9063_compatible_rtc_regmap *config = rtc->config;
	u8 data[RTC_DATA_LEN];
	int ret;

	da9063_tm_to_data(tm, data, rtc);
	ret = regmap_bulk_write(rtc->regmap,
	config->rtc_count_secs_reg,
	data, RTC_DATA_LEN);
	if (ret < 0)
	dev_err(dev, "Failed to set RTC time data: %d\n", ret);

	return ret;
	}

	static int da9063_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
	const struct da9063_compatible_rtc_regmap *config = rtc->config;
	u8 data[RTC_DATA_LEN];
	int ret;
	unsigned int val;

	data[RTC_SEC] = 0;
	ret = regmap_bulk_read(rtc->regmap,
	config->rtc_alarm_secs_reg,
	&data[config->rtc_data_start],
	config->rtc_alarm_len);
	if (ret < 0)
	return ret;

	da9063_data_to_tm(data, &alrm->time, rtc);

	alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);

	ret = regmap_read(rtc->regmap,
	config->rtc_event_reg,
	&val);
	if (ret < 0)
	return ret;

	if (val & config->rtc_event_alarm_mask)
	alrm->pending = 1;
	else
	alrm->pending = 0;

	return 0;
	}

	static int da9063_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	{
	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
	const struct da9063_compatible_rtc_regmap *config = rtc->config;
	u8 data[RTC_DATA_LEN];
	int ret;

	da9063_tm_to_data(&alrm->time, data, rtc);

	ret = da9063_rtc_stop_alarm(dev);
	if (ret < 0) {
	dev_err(dev, "Failed to stop alarm: %d\n", ret);
	return ret;
	}

	ret = regmap_bulk_write(rtc->regmap,
	config->rtc_alarm_secs_reg,
	&data[config->rtc_data_start],
	config->rtc_alarm_len);
	if (ret < 0) {
	dev_err(dev, "Failed to write alarm: %d\n", ret);
	return ret;
	}

	da9063_data_to_tm(data, &rtc->alarm_time, rtc);

	if (alrm->enabled) {
	ret = da9063_rtc_start_alarm(dev);
	if (ret < 0) {
	dev_err(dev, "Failed to start alarm: %d\n", ret);
	return ret;
	}
	}

	return ret;
	}

	static int da9063_rtc_alarm_irq_enable(struct device *dev,
	unsigned int enabled)
	{
	if (enabled)
	return da9063_rtc_start_alarm(dev);
	else
	return da9063_rtc_stop_alarm(dev);
	}

	static irqreturn_t da9063_alarm_event(int irq, void *data)
	{
	struct da9063_compatible_rtc *rtc = data;
	const struct da9063_compatible_rtc_regmap *config = rtc->config;

	regmap_update_bits(rtc->regmap,
	config->rtc_alarm_year_reg,
	config->rtc_alarm_on_mask,
	0);

	rtc->rtc_sync = true;
	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF \| RTC_AF);

	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops da9063_rtc_ops = {
	.read_time = da9063_rtc_read_time,
	.set_time = da9063_rtc_set_time,
	.read_alarm = da9063_rtc_read_alarm,
	.set_alarm = da9063_rtc_set_alarm,
	.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
	};

	static int da9063_rtc_probe(struct platform_device *pdev)
	{
	struct da9063_compatible_rtc *rtc;
	const struct da9063_compatible_rtc_regmap *config;
	const struct of_device_id *match;
	int irq_alarm;
	u8 data[RTC_DATA_LEN];
	int ret;

	if (!pdev->dev.of_node)
	return -ENXIO;

	match = of_match_node(da9063_compatible_reg_id_table,
	pdev->dev.of_node);

	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
	if (!rtc)
	return -ENOMEM;

	rtc->config = match->data;
	if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
	struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);

	if (chip->variant_code == PMIC_DA9063_AD)
	rtc->config = &da9063_ad_regs;
	}

	rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!rtc->regmap) {
	dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
	return -ENXIO;
	}

	config = rtc->config;
	ret = regmap_update_bits(rtc->regmap,
	config->rtc_enable_reg,
	config->rtc_enable_mask,
	config->rtc_enable_mask);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to enable RTC\n");
	return ret;
	}

	ret = regmap_update_bits(rtc->regmap,
	config->rtc_enable_32k_crystal_reg,
	config->rtc_crystal_mask,
	config->rtc_crystal_mask);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
	return ret;
	}

	ret = regmap_update_bits(rtc->regmap,
	config->rtc_alarm_secs_reg,
	config->rtc_alarm_status_mask,
	0);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
	return ret;
	}

	ret = regmap_update_bits(rtc->regmap,
	config->rtc_alarm_secs_reg,
	DA9063_ALARM_STATUS_ALARM,
	DA9063_ALARM_STATUS_ALARM);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
	return ret;
	}

	ret = regmap_update_bits(rtc->regmap,
	config->rtc_alarm_year_reg,
	config->rtc_tick_on_mask,
	0);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to disable TICKs\n");
	return ret;
	}

	data[RTC_SEC] = 0;
	ret = regmap_bulk_read(rtc->regmap,
	config->rtc_alarm_secs_reg,
	&data[config->rtc_data_start],
	config->rtc_alarm_len);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
	ret);
	return ret;
	}

	platform_set_drvdata(pdev, rtc);

	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(rtc->rtc_dev))
	return PTR_ERR(rtc->rtc_dev);

	rtc->rtc_dev->ops = &da9063_rtc_ops;
	rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
	rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_2063;

	da9063_data_to_tm(data, &rtc->alarm_time, rtc);
	rtc->rtc_sync = false;

	if (config->rtc_data_start != RTC_SEC) {
	set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtc_dev->features);
	/*
	* TODO: some models have alarms on a minute boundary but still
	* support real hardware interrupts.
	*/
	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtc_dev->features);
	}

	irq_alarm = platform_get_irq_byname(pdev, "ALARM");
	if (irq_alarm < 0)
	return irq_alarm;

	ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
	da9063_alarm_event,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"ALARM", rtc);
	if (ret)
	dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
	irq_alarm, ret);

	ret = dev_pm_set_wake_irq(&pdev->dev, irq_alarm);
	if (ret)
	dev_warn(&pdev->dev,
	"Failed to set IRQ %d as a wake IRQ: %d\n",
	irq_alarm, ret);

	device_init_wakeup(&pdev->dev, true);

	return devm_rtc_register_device(rtc->rtc_dev);
	}

	static struct platform_driver da9063_rtc_driver = {
	.probe = da9063_rtc_probe,
	.driver = {
	.name = DA9063_DRVNAME_RTC,
	.of_match_table = da9063_compatible_reg_id_table,
	},
	};

	module_platform_driver(da9063_rtc_driver);

	MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
	MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);