[PATCH 2/3] rtc: pcf85263: Basic driver

[Martin Fuzzey <mfuzzey-mB3Nsq4MPf1BDgjK7y7TUQ@public.gmane.org>]

Add basic support for NXP PCF85263 I2C RTC chip.

Only RTC and Alarm functions are supported.

Signed-off-by: Martin Fuzzey <mfuzzey-mB3Nsq4MPf1BDgjK7y7TUQ@public.gmane.org>
---
 drivers/rtc/Kconfig        |    8 +
 drivers/rtc/Makefile       |    1 
 drivers/rtc/rtc-pcf85263.c |  655 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 664 insertions(+)
 create mode 100644 drivers/rtc/rtc-pcf85263.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 18639e0..63ec0fc 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -396,6 +396,14 @@ config RTC_DRV_PCF85063
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-pcf85063.
 
+config RTC_DRV_PCF85263
+	tristate "NXP PCF85263"
+	help
+	  If you say yes here you get support for the PCF85263 RTC chip
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-pcf85263.
+
 config RTC_DRV_PCF8563
 	tristate "Philips PCF8563/Epson RTC8564"
 	help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index ea28337..04f48fd 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_RTC_DRV_PCF2123)	+= rtc-pcf2123.o
 obj-$(CONFIG_RTC_DRV_PCF2127)	+= rtc-pcf2127.o
 obj-$(CONFIG_RTC_DRV_PCF50633)	+= rtc-pcf50633.o
 obj-$(CONFIG_RTC_DRV_PCF85063)	+= rtc-pcf85063.o
+obj-$(CONFIG_RTC_DRV_PCF85263)	+= rtc-pcf85263.o
 obj-$(CONFIG_RTC_DRV_PCF8523)	+= rtc-pcf8523.o
 obj-$(CONFIG_RTC_DRV_PCF8563)	+= rtc-pcf8563.o
 obj-$(CONFIG_RTC_DRV_PCF8583)	+= rtc-pcf8583.o
diff --git a/drivers/rtc/rtc-pcf85263.c b/drivers/rtc/rtc-pcf85263.c
new file mode 100644
index 0000000..997742d
--- /dev/null
+++ b/drivers/rtc/rtc-pcf85263.c
@@ -0,0 +1,655 @@
+/*
+ * rtc-pcf85263 Driver for the NXP PCF85263 RTC
+ *
+ * Copyright 2016 Parkeon
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rtc.h>
+#include <linux/i2c.h>
+#include <linux/bcd.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/rtc/nxp,pcf85263.h>
+
+#define DRV_NAME "rtc-pcf85263"
+
+#define PCF85263_REG_RTC_SC	0x01	/* Seconds */
+#define PCF85263_REG_RTC_SC_OS		BIT(7)	/* Oscilator stopped flag */
+
+#define PCF85263_REG_RTC_MN	0x02	/* Minutes */
+#define PCF85263_REG_RTC_HR	0x03	/* Hours */
+#define PCF85263_REG_RTC_DT	0x04	/* Day of month 1-31 */
+#define PCF85263_REG_RTC_DW	0x05	/* Day of week 0-6 */
+#define PCF85263_REG_RTC_MO	0x06	/* Month 1-12 */
+#define PCF85263_REG_RTC_YR	0x07	/* Year 0-99 */
+
+#define PCF85263_REG_ALM1_SC	0x08	/* Seconds */
+#define PCF85263_REG_ALM1_MN	0x09	/* Minutes */
+#define PCF85263_REG_ALM1_HR	0x0a	/* Hours */
+#define PCF85263_REG_ALM1_DT	0x0b	/* Day of month 1-31 */
+#define PCF85263_REG_ALM1_MO	0x0c	/* Month 1-12 */
+
+#define PCF85263_REG_ALM_CTL	0x10
+#define PCF85263_REG_ALM_CTL_ALL_A1E	0x1f /* sec,min,hr,day,mon alarm 1 */
+
+#define PCF85263_REG_OSC	0x25
+#define PCF85263_REG_OSC_CL_MASK	(BIT(0) | BIT(1))
+#define PCF85263_REG_OSC_CL_SHIFT	0
+#define PCF85263_REG_OSC_OSCD_MASK	(BIT(2) | BIT(3))
+#define PCF85263_REG_OSC_OSCD_SHIFT	2
+#define PCF85263_REG_OSC_LOWJ		BIT(4)
+#define PCF85263_REG_OSC_12H		BIT(5)
+
+#define PCF85263_REG_PINIO	0x27
+#define PCF85263_REG_PINIO_INTAPM_MASK	(BIT(0) | BIT(1))
+#define PCF85263_REG_PINIO_INTAPM_SHIFT	0
+#define PCF85263_INTAPM_INTA	(0x2 << PCF85263_REG_PINIO_INTAPM_SHIFT)
+#define PCF85263_INTAPM_HIGHZ	(0x3 << PCF85263_REG_PINIO_INTAPM_SHIFT)
+#define PCF85263_REG_PINIO_TSPM_MASK	(BIT(2) | BIT(3))
+#define PCF85263_REG_PINIO_TSPM_SHIFT	2
+#define PCF85263_TSPM_DISABLED		(0x0 << PCF85263_REG_PINIO_TSPM_SHIFT)
+#define PCF85263_TSPM_INTB		(0x1 << PCF85263_REG_PINIO_TSPM_SHIFT)
+#define PCF85263_REG_PINIO_CLKDISABLE	BIT(7)
+
+#define PCF85263_REG_FUNCTION	0x28
+#define PCF85263_REG_FUNCTION_COF_MASK	0x7
+#define PCF85263_REG_FUNCTION_COF_OFF	0x7	/* No clock output */
+
+#define PCF85263_REG_INTA_CTL	0x29
+#define PCF85263_REG_INTB_CTL	0x2A
+#define PCF85263_REG_INTx_CTL_A1E	BIT(4)	/* Alarm 1 */
+#define PCF85263_REG_INTx_CTL_ILP	BIT(7)	/* 0=pulse, 1=level */
+
+#define PCF85263_REG_FLAGS	0x2B
+#define PCF85263_REG_FLAGS_A1F		BIT(5)
+
+#define PCF85263_REG_RAM_BYTE	0x2c
+
+#define PCF85263_REG_STOPENABLE 0x2e
+#define PCF85263_REG_STOPENABLE_STOP	BIT(0)
+
+#define PCF85263_REG_RESET	0x2f	/* Reset command */
+#define PCF85263_REG_RESET_CMD_CPR	0xa4	/* Clear prescaler */
+
+#define PCF85263_MAX_REG 0x2f
+
+#define PCF85263_HR_PM		BIT(5)
+
+enum pcf85263_irqpin {
+	PCF85263_IRQPIN_NONE,
+	PCF85263_IRQPIN_INTA,
+	PCF85263_IRQPIN_INTB
+};
+
+static const char *const pcf85263_irqpin_names[] = {
+	[PCF85263_IRQPIN_NONE] = "None",
+	[PCF85263_IRQPIN_INTA] = "INTA",
+	[PCF85263_IRQPIN_INTB] = "INTB"
+};
+
+struct pcf85263 {
+	struct device *dev;
+	struct rtc_device *rtc;
+	struct regmap *regmap;
+	enum pcf85263_irqpin irq_pin;
+	int irq;
+	bool mode_12h;
+};
+
+/*
+ * Helpers to convert 12h to 24h and vice versa.
+ * Values in register are stored in BCD with a PM flag in bit 5
+ *
+ * 23:00 <=> 11PM <=> 0x31
+ * 00:00 <=> 12AM <=> 0x12
+ * 01:00 <=> 1AM <=> 0x01
+ * 12:00 <=> 12PM <=> 0x32
+ * 13:00 <=> 1PM <=> 0x21
+ */
+static int pcf85263_bcd12h_to_bin24h(int regval)
+{
+	int hr = bcd2bin(regval & 0x1f);
+	bool pm = regval & PCF85263_HR_PM;
+
+	if (hr == 12)
+		return pm ? 12 : 0;
+
+	return pm ? hr + 12 : hr;
+}
+
+static int pcf85263_bin24h_to_bcd12h(int hr24)
+{
+	bool pm = hr24 >= 12;
+	int hr12 = hr24 % 12;
+
+	if (!hr12)
+		hr12++;
+
+	return bin2bcd(hr12) | pm ? 0 : PCF85263_HR_PM;
+}
+
+static int pcf85263_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+	const int first = PCF85263_REG_RTC_SC;
+	const int last = PCF85263_REG_RTC_YR;
+	const int len = last - first + 1;
+	u8 regs[len];
+	u8 hr_reg;
+	int ret;
+
+	ret = regmap_bulk_read(pcf85263->regmap, first, regs, len);
+	if (ret)
+		return ret;
+
+	if (regs[PCF85263_REG_RTC_SC - first] & PCF85263_REG_RTC_SC_OS) {
+		dev_warn(dev, "Oscillator stop detected, date/time is not reliable.\n");
+		return -EINVAL;
+	}
+
+	tm->tm_sec = bcd2bin(regs[PCF85263_REG_RTC_SC - first] & 0x7f);
+	tm->tm_min = bcd2bin(regs[PCF85263_REG_RTC_MN - first] & 0x7f);
+
+	hr_reg = regs[PCF85263_REG_RTC_HR - first];
+	if (pcf85263->mode_12h)
+		tm->tm_hour = pcf85263_bcd12h_to_bin24h(hr_reg);
+	else
+		tm->tm_hour = bcd2bin(hr_reg & 0x3f);
+
+	tm->tm_mday = bcd2bin(regs[PCF85263_REG_RTC_DT - first]);
+	tm->tm_wday = bcd2bin(regs[PCF85263_REG_RTC_DW - first]);
+	tm->tm_mon  = bcd2bin(regs[PCF85263_REG_RTC_MO - first]) - 1;
+	tm->tm_year = bcd2bin(regs[PCF85263_REG_RTC_YR - first]);
+
+	tm->tm_year += 100;  /* Assume 21st century */
+
+	return 0;
+}
+
+static int pcf85263_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+
+	/*
+	 * Before setting time need to stop RTC and disable prescaler
+	 * Do this all in a single I2C transaction exploiting wraparound
+	 * as described in data sheet.
+	 * This means that the array below must be in register order
+	 */
+	u8 regs[] = {
+		PCF85263_REG_STOPENABLE_STOP,	/* STOP */
+		PCF85263_REG_RESET_CMD_CPR,	/* Disable prescaler */
+		/* Wrap around to register 0 (1/100s) */
+		0,				/* 1/100s always zero. */
+		bin2bcd(tm->tm_sec),
+		bin2bcd(tm->tm_min),
+		bin2bcd(tm->tm_hour),		/* 24-hour */
+		bin2bcd(tm->tm_mday),
+		bin2bcd(tm->tm_wday + 1),
+		bin2bcd(tm->tm_mon + 1),
+		bin2bcd(tm->tm_year % 100)
+	};
+	int ret;
+
+	ret = regmap_bulk_write(pcf85263->regmap, PCF85263_REG_STOPENABLE,
+				regs, sizeof(regs));
+	if (ret)
+		return ret;
+
+	/* As we have set the time in 24H update the hardware for that */
+	if (pcf85263->mode_12h) {
+		pcf85263->mode_12h = false;
+		ret = regmap_update_bits(pcf85263->regmap, PCF85263_REG_OSC,
+					 PCF85263_REG_OSC_12H, 0);
+		if (ret)
+			return ret;
+	}
+
+	/* Start it again */
+	return regmap_write(pcf85263->regmap, PCF85263_REG_STOPENABLE, 0);
+}
+
+static int pcf85263_enable_alarm(struct pcf85263 *pcf85263, bool enable)
+{
+	int reg;
+	int ret;
+
+	ret = regmap_update_bits(pcf85263->regmap, PCF85263_REG_ALM_CTL,
+				 PCF85263_REG_ALM_CTL_ALL_A1E,
+				 enable ? PCF85263_REG_ALM_CTL_ALL_A1E : 0);
+	if (ret)
+		return ret;
+
+	switch (pcf85263->irq_pin) {
+	case PCF85263_IRQPIN_NONE:
+		return 0;
+
+	case PCF85263_IRQPIN_INTA:
+		reg = PCF85263_REG_INTA_CTL;
+		break;
+
+	case PCF85263_IRQPIN_INTB:
+		reg = PCF85263_REG_INTB_CTL;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_update_bits(pcf85263->regmap, reg,
+				  PCF85263_REG_INTx_CTL_A1E,
+				  enable ? PCF85263_REG_INTx_CTL_A1E : 0);
+}
+
+static int pcf85263_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+	struct rtc_time *tm = &alarm->time;
+	const int first = PCF85263_REG_ALM1_SC;
+	const int last = PCF85263_REG_ALM1_MO;
+	const int len = last - first + 1;
+	u8 regs[len];
+	u8 hr_reg;
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_bulk_read(pcf85263->regmap, first, regs, len);
+	if (ret)
+		return ret;
+
+	tm->tm_sec = bcd2bin(regs[PCF85263_REG_ALM1_SC - first] & 0x7f);
+	tm->tm_min = bcd2bin(regs[PCF85263_REG_ALM1_MN - first] & 0x7f);
+
+	hr_reg = regs[PCF85263_REG_ALM1_HR - first];
+	if (pcf85263->mode_12h)
+		tm->tm_hour = pcf85263_bcd12h_to_bin24h(hr_reg);
+	else
+		tm->tm_hour = bcd2bin(hr_reg & 0x3f);
+
+	tm->tm_mday = bcd2bin(regs[PCF85263_REG_ALM1_DT - first]);
+	tm->tm_mon  = bcd2bin(regs[PCF85263_REG_ALM1_MO - first]) - 1;
+	tm->tm_year = -1;
+	tm->tm_wday = -1;
+
+	ret = regmap_read(pcf85263->regmap, PCF85263_REG_ALM_CTL, &regval);
+	if (ret)
+		return ret;
+	alarm->enabled = !!(regval & PCF85263_REG_ALM_CTL_ALL_A1E);
+
+	ret = regmap_read(pcf85263->regmap, PCF85263_REG_FLAGS, &regval);
+	if (ret)
+		return ret;
+	alarm->pending = !!(regval & PCF85263_REG_FLAGS_A1F);
+
+	return 0;
+}
+
+static int pcf85263_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+	struct rtc_time *tm = &alarm->time;
+	const int first = PCF85263_REG_ALM1_SC;
+	const int last = PCF85263_REG_ALM1_MO;
+	const int len = last - first + 1;
+	u8 regs[len];
+	int ret;
+
+	/* Disable alarm comparison during update */
+	ret = pcf85263_enable_alarm(pcf85263, false);
+	if (ret)
+		return ret;
+
+	/* Clear any pending alarm (write 0=>clr, 1=>no change) */
+	ret = regmap_write(pcf85263->regmap, PCF85263_REG_FLAGS,
+			   ~PCF85263_REG_FLAGS_A1F);
+	if (ret)
+		return ret;
+
+	/* Set the alarm time registers */
+	regs[PCF85263_REG_ALM1_SC - first] = bin2bcd(tm->tm_sec);
+	regs[PCF85263_REG_ALM1_MN - first] = bin2bcd(tm->tm_min);
+	regs[PCF85263_REG_ALM1_HR - first] = pcf85263->mode_12h ?
+			pcf85263_bin24h_to_bcd12h(tm->tm_hour) :
+			bin2bcd(tm->tm_hour);
+	regs[PCF85263_REG_ALM1_DT - first] = bin2bcd(tm->tm_mday);
+	regs[PCF85263_REG_ALM1_MO - first] = bin2bcd(tm->tm_mon + 1);
+
+	ret = regmap_bulk_write(pcf85263->regmap, first, regs, sizeof(regs));
+	if (ret)
+		return ret;
+
+	if (alarm->enabled)
+		ret = pcf85263_enable_alarm(pcf85263, true);
+
+	return ret;
+}
+
+static int pcf85263_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+
+	return pcf85263_enable_alarm(pcf85263, !!enable);
+}
+
+static irqreturn_t pcf85263_irq(int irq, void *data)
+{
+	struct pcf85263 *pcf85263 = data;
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(pcf85263->regmap, PCF85263_REG_FLAGS, &regval);
+	if (ret)
+		return IRQ_NONE;
+
+	if (regval & PCF85263_REG_FLAGS_A1F) {
+		regmap_write(pcf85263->regmap, PCF85263_REG_FLAGS,
+			     ~PCF85263_REG_FLAGS_A1F);
+
+		rtc_update_irq(pcf85263->rtc, 1, RTC_IRQF | RTC_AF);
+
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static int pcf85263_check_osc_stopped(struct pcf85263 *pcf85263)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(pcf85263->regmap, PCF85263_REG_RTC_SC, &regval);
+	if (ret)
+		return ret;
+
+	ret = regval & PCF85263_REG_RTC_SC_OS ? 1 : 0;
+	if (ret)
+		dev_warn(pcf85263->dev, "Oscillator stop detected, date/time is not reliable.\n");
+
+	return ret;
+}
+
+#ifdef CONFIG_RTC_INTF_DEV
+static int pcf85263_ioctl(struct device *dev,
+			  unsigned int cmd, unsigned long arg)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+	int ret;
+
+	switch (cmd) {
+	case RTC_VL_READ:
+		ret = pcf85263_check_osc_stopped(pcf85263);
+		if (ret < 0)
+			return ret;
+
+		if (copy_to_user((void __user *)arg, &ret, sizeof(int)))
+			return -EFAULT;
+		return 0;
+
+	case RTC_VL_CLR:
+		return regmap_update_bits(pcf85263->regmap,
+					  PCF85263_REG_RTC_SC,
+					  PCF85263_REG_RTC_SC_OS, 0);
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+#else
+#define pcf85263_ioctl NULL
+#endif
+
+static int pcf85263_init_hw(struct pcf85263 *pcf85263)
+{
+	struct device_node *np = pcf85263->dev->of_node;
+	unsigned int regval;
+	u32 propval;
+	int ret;
+
+	/* Determine if oscilator has been stopped (probably low power) */
+	ret = pcf85263_check_osc_stopped(pcf85263);
+	if (ret < 0) {
+		/* Log here since this is the first hw access on probe */
+		dev_err(pcf85263->dev, "Unable to read register\n");
+
+		return ret;
+	}
+
+	/* Determine 12/24H mode */
+	ret = regmap_read(pcf85263->regmap, PCF85263_REG_OSC, &regval);
+	if (ret)
+		return ret;
+	pcf85263->mode_12h = !!(regval & PCF85263_REG_OSC_12H);
+
+	/* Set oscilator register */
+	regval &= ~PCF85263_REG_OSC_12H; /* keep current 12/24 h setting */
+
+	propval = PCF85263_QUARTZCAP_12p5pF;
+	of_property_read_u32(np, "quartz-load-capacitance", &propval);
+	regval |= ((propval << PCF85263_REG_OSC_CL_SHIFT)
+		    & PCF85263_REG_OSC_CL_MASK);
+
+	propval = PCF85263_QUARTZDRIVE_NORMAL;
+	of_property_read_u32(np, "quartz-drive-strength", &propval);
+	regval |= ((propval << PCF85263_REG_OSC_OSCD_SHIFT)
+		    & PCF85263_REG_OSC_OSCD_MASK);
+
+	if (of_property_read_bool(np, "quartz-low-jitter"))
+		regval |= PCF85263_REG_OSC_LOWJ;
+
+	ret = regmap_write(pcf85263->regmap, PCF85263_REG_OSC, regval);
+	if (ret)
+		return ret;
+
+	/* Set function register (RTC mode, 1s tick, clock output static) */
+	ret = regmap_write(pcf85263->regmap, PCF85263_REG_FUNCTION,
+			   PCF85263_REG_FUNCTION_COF_OFF);
+	if (ret)
+		return ret;
+
+	/* Set all interrupts to disabled, level mode */
+	ret = regmap_write(pcf85263->regmap, PCF85263_REG_INTA_CTL,
+			   PCF85263_REG_INTx_CTL_ILP);
+	if (ret)
+		return ret;
+	ret = regmap_write(pcf85263->regmap, PCF85263_REG_INTB_CTL,
+			   PCF85263_REG_INTx_CTL_ILP);
+	if (ret)
+		return ret;
+
+	/* Setup IO pin config register */
+	regval = PCF85263_REG_PINIO_CLKDISABLE;
+	switch (pcf85263->irq_pin) {
+	case PCF85263_IRQPIN_INTA:
+		regval |= (PCF85263_INTAPM_INTA | PCF85263_TSPM_DISABLED);
+		break;
+	case PCF85263_IRQPIN_INTB:
+		regval |= (PCF85263_INTAPM_HIGHZ | PCF85263_TSPM_INTB);
+		break;
+	case PCF85263_IRQPIN_NONE:
+		regval |= (PCF85263_INTAPM_HIGHZ | PCF85263_TSPM_DISABLED);
+		break;
+	}
+	ret = regmap_write(pcf85263->regmap, PCF85263_REG_PINIO, regval);
+
+	return ret;
+}
+
+static const struct rtc_class_ops rtc_ops = {
+	.ioctl = pcf85263_ioctl,
+	.read_time = pcf85263_read_time,
+	.set_time = pcf85263_set_time,
+	.read_alarm = pcf85263_read_alarm,
+	.set_alarm = pcf85263_set_alarm,
+	.alarm_irq_enable = pcf85263_alarm_irq_enable,
+};
+
+static const struct regmap_config pcf85263_regmap_cfg = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = PCF85263_MAX_REG,
+};
+
+/*
+ * On some boards the interrupt line may not be wired to the CPU but only to
+ * a power supply circuit.
+ * In that case no interrupt will be specified in the device tree but the
+ * wakeup-source DT property may be used to enable wakeup programming in
+ * sysfs
+ */
+static bool pcf85263_can_wakeup_machine(struct pcf85263 *pcf85263)
+{
+	return pcf85263->irq ||
+		of_property_read_bool(pcf85263->dev->of_node, "wakeup-source");
+}
+
+static int pcf85263_probe(struct i2c_client *client,
+				const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct pcf85263 *pcf85263;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -ENODEV;
+
+	pcf85263 = devm_kzalloc(dev, sizeof(*pcf85263), GFP_KERNEL);
+	if (!pcf85263)
+		return -ENOMEM;
+
+	pcf85263->dev = dev;
+	pcf85263->irq = client->irq;
+	dev_set_drvdata(dev, pcf85263);
+
+	pcf85263->regmap = devm_regmap_init_i2c(client, &pcf85263_regmap_cfg);
+	if (IS_ERR(pcf85263->regmap)) {
+		ret = PTR_ERR(pcf85263->regmap);
+		dev_err(dev, "regmap allocation failed (%d)\n", ret);
+
+		return ret;
+	}
+
+	/* Determine which interrupt pin the board uses */
+	if (pcf85263_can_wakeup_machine(pcf85263)) {
+		if (of_property_match_string(dev->of_node,
+					     "interrupt-names", "INTB") >= 0)
+			pcf85263->irq_pin = PCF85263_IRQPIN_INTB;
+		else
+			pcf85263->irq_pin = PCF85263_IRQPIN_INTA;
+	} else {
+		pcf85263->irq_pin = PCF85263_IRQPIN_NONE;
+	}
+
+	ret = pcf85263_init_hw(pcf85263);
+	if (ret)
+		return ret;
+
+	if (pcf85263->irq) {
+		ret = devm_request_threaded_irq(dev, pcf85263->irq, NULL,
+						pcf85263_irq,
+						IRQF_ONESHOT,
+						dev->driver->name, pcf85263);
+		if (ret) {
+			dev_err(dev, "irq %d unavailable (%d)\n",
+				pcf85263->irq, ret);
+			pcf85263->irq = 0;
+		}
+	}
+
+	if (pcf85263_can_wakeup_machine(pcf85263))
+		device_init_wakeup(dev, true);
+
+	pcf85263->rtc = devm_rtc_device_register(dev, dev->driver->name,
+						 &rtc_ops, THIS_MODULE);
+	ret = PTR_ERR_OR_ZERO(pcf85263->rtc);
+	if (ret)
+		return ret;
+
+	/* We cannot support UIE mode if we do not have an IRQ line */
+	if (!pcf85263->irq)
+		pcf85263->rtc->uie_unsupported = 1;
+
+	dev_info(pcf85263->dev,
+		 "PCF85263 RTC (irqpin=%s irq=%d)\n",
+		 pcf85263_irqpin_names[pcf85263->irq_pin],
+		 pcf85263->irq);
+
+	return 0;
+}
+
+static int pcf85263_remove(struct i2c_client *client)
+{
+	struct pcf85263 *pcf85263 = i2c_get_clientdata(client);
+
+	if (pcf85263_can_wakeup_machine(pcf85263))
+		device_init_wakeup(pcf85263->dev, false);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pcf85263_suspend(struct device *dev)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (device_may_wakeup(dev))
+		ret = enable_irq_wake(pcf85263->irq);
+
+	return ret;
+}
+
+static int pcf85263_resume(struct device *dev)
+{
+	struct pcf85263 *pcf85263 = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (device_may_wakeup(dev))
+		ret = disable_irq_wake(pcf85263->irq);
+
+	return ret;
+}
+
+#endif
+
+static const struct i2c_device_id pcf85263_id[] = {
+	{ "pcf85263", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pcf85263_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pcf85263_of_match[] = {
+	{ .compatible = "nxp,pcf85263" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, pcf85263_of_match);
+#endif
+
+static SIMPLE_DEV_PM_OPS(pcf85263_pm_ops, pcf85263_suspend,  pcf85263_resume);
+
+static struct i2c_driver pcf85263_driver = {
+	.driver		= {
+		.name	= "rtc-pcf85263",
+		.of_match_table = of_match_ptr(pcf85263_of_match),
+		.pm = &pcf85263_pm_ops,
+	},
+	.probe		= pcf85263_probe,
+	.remove		= pcf85263_remove,
+	.id_table	= pcf85263_id,
+};
+
+module_i2c_driver(pcf85263_driver);
+
+MODULE_AUTHOR("Martin Fuzzey <mfuzzey-mB3Nsq4MPf1BDgjK7y7TUQ@public.gmane.org>");
+MODULE_DESCRIPTION("PCF85263 RTC Driver");
+MODULE_LICENSE("GPL");

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