Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 497 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-da9063.c b/drivers/rtc/rtc-da9063.c
new file mode 100644
index 000000000..557c9b29d
--- /dev/null
+++ b/drivers/rtc/rtc-da9063.c
@@ -0,0 +1,497 @@
+// 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_alarm_irq_enable(struct device *dev,
+				       unsigned int enabled)
+{
+	struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
+	const struct da9063_compatible_rtc_regmap *config = rtc->config;
+	u8 set_bit = enabled ? config->rtc_alarm_on_mask : 0;
+
+	return regmap_update_bits(rtc->regmap,
+				  config->rtc_alarm_year_reg,
+				  config->rtc_alarm_on_mask,
+				  set_bit);
+}
+
+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_alarm_irq_enable(dev, 0);
+	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_alarm_irq_enable(dev, 1);
+		if (ret < 0) {
+			dev_err(dev, "Failed to start alarm: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+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;
+	int irq_alarm;
+	u8 data[RTC_DATA_LEN];
+	int ret;
+
+	if (!pdev->dev.of_node)
+		return -ENXIO;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+
+	rtc->config = device_get_match_data(&pdev->dev);
+	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)
+		return dev_err_probe(&pdev->dev, ret, "Failed to enable RTC\n");
+
+	ret = regmap_update_bits(rtc->regmap,
+				 config->rtc_enable_32k_crystal_reg,
+				 config->rtc_crystal_mask,
+				 config->rtc_crystal_mask);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to run 32kHz oscillator\n");
+
+	ret = regmap_update_bits(rtc->regmap,
+				 config->rtc_alarm_secs_reg,
+				 config->rtc_alarm_status_mask,
+				 0);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to access RTC alarm register\n");
+
+	ret = regmap_update_bits(rtc->regmap,
+				 config->rtc_alarm_secs_reg,
+				 DA9063_ALARM_STATUS_ALARM,
+				 DA9063_ALARM_STATUS_ALARM);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to access RTC alarm register\n");
+
+	ret = regmap_update_bits(rtc->regmap,
+				 config->rtc_alarm_year_reg,
+				 config->rtc_tick_on_mask,
+				 0);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to disable TICKs\n");
+
+	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 dev_err_probe(&pdev->dev, ret,
+				     "Failed to read initial alarm data\n");
+
+	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_optional(pdev, "ALARM");
+	if (irq_alarm >= 0) {
+		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);
+	}  else if (irq_alarm != -ENXIO) {
+		return irq_alarm;
+	} else {
+		clear_bit(RTC_FEATURE_ALARM, rtc->rtc_dev->features);
+	}
+
+	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");