Merge remote-tracking branch 'regulator/topic/da9055' into regulator-next

3 files changed, 691 insertions, 0 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index f73d6f5ce6dd..e6fcf20c3cd3 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -109,6 +109,16 @@ config REGULATOR_DA9052
 	  This driver supports the voltage regulators of DA9052-BC and
 	  DA9053-AA/Bx PMIC.
 
+config REGULATOR_DA9055
+	tristate "Dialog Semiconductor DA9055 regulators"
+	depends on MFD_DA9055
+	help
+	  Say y here to support the BUCKs and LDOs regulators found on
+	  Dialog Semiconductor DA9055 PMIC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called da9055-regulator.
+
 config REGULATOR_FAN53555
 	tristate "Fairchild FAN53555 Regulator"
 	depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index c1557ace9095..993151d6fdf9 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o arizona-ldo1.o
 obj-$(CONFIG_REGULATOR_AS3711) += as3711-regulator.o
 obj-$(CONFIG_REGULATOR_DA903X)	+= da903x.o
 obj-$(CONFIG_REGULATOR_DA9052)	+= da9052-regulator.o
+obj-$(CONFIG_REGULATOR_DA9055)	+= da9055-regulator.o
 obj-$(CONFIG_REGULATOR_DBX500_PRCMU) += dbx500-prcmu.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_FAN53555) += fan53555.o
diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c
new file mode 100644
index 000000000000..db59ce7534cd
--- /dev/null
+++ b/drivers/regulator/da9055-regulator.c
@@ -0,0 +1,680 @@
+/*
+* Regulator driver for DA9055 PMIC
+*
+* Copyright(c) 2012 Dialog Semiconductor Ltd.
+*
+* Author: David Dajun Chen <dchen@diasemi.com>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+#include <linux/mfd/da9055/core.h>
+#include <linux/mfd/da9055/reg.h>
+#include <linux/mfd/da9055/pdata.h>
+
+#define DA9055_MIN_UA		0
+#define DA9055_MAX_UA		3
+
+#define DA9055_LDO_MODE_SYNC	0
+#define DA9055_LDO_MODE_SLEEP	1
+
+#define DA9055_BUCK_MODE_SLEEP	1
+#define DA9055_BUCK_MODE_SYNC	2
+#define DA9055_BUCK_MODE_AUTO	3
+
+/* DA9055 REGULATOR IDs */
+#define DA9055_ID_BUCK1	0
+#define DA9055_ID_BUCK2	1
+#define DA9055_ID_LDO1		2
+#define DA9055_ID_LDO2		3
+#define DA9055_ID_LDO3		4
+#define DA9055_ID_LDO4		5
+#define DA9055_ID_LDO5		6
+#define DA9055_ID_LDO6		7
+
+/* DA9055 BUCK current limit */
+static const int da9055_current_limits[] = { 500000, 600000, 700000, 800000 };
+
+struct da9055_conf_reg {
+	int reg;
+	int sel_mask;
+	int en_mask;
+};
+
+struct da9055_volt_reg {
+	int reg_a;
+	int reg_b;
+	int sl_shift;
+	int v_offset;
+	int v_mask;
+	int v_shift;
+};
+
+struct da9055_mode_reg {
+	int reg;
+	int mask;
+	int shift;
+};
+
+struct da9055_regulator_info {
+	struct regulator_desc reg_desc;
+	struct da9055_conf_reg conf;
+	struct da9055_volt_reg volt;
+	struct da9055_mode_reg mode;
+};
+
+struct da9055_regulator {
+	struct da9055 *da9055;
+	struct da9055_regulator_info *info;
+	struct regulator_dev *rdev;
+	enum gpio_select reg_rselect;
+};
+
+static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int ret, mode = 0;
+
+	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
+	if (ret < 0)
+		return ret;
+
+	switch ((ret & info->mode.mask) >> info->mode.shift) {
+	case DA9055_BUCK_MODE_SYNC:
+		mode = REGULATOR_MODE_FAST;
+		break;
+	case DA9055_BUCK_MODE_AUTO:
+		mode = REGULATOR_MODE_NORMAL;
+		break;
+	case DA9055_BUCK_MODE_SLEEP:
+		mode = REGULATOR_MODE_STANDBY;
+		break;
+	}
+
+	return mode;
+}
+
+static int da9055_buck_set_mode(struct regulator_dev *rdev,
+					unsigned int mode)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int val = 0;
+
+	switch (mode) {
+	case REGULATOR_MODE_FAST:
+		val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
+		break;
+	case REGULATOR_MODE_NORMAL:
+		val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
+		break;
+	case REGULATOR_MODE_STANDBY:
+		val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
+		break;
+	}
+
+	return da9055_reg_update(regulator->da9055, info->mode.reg,
+				 info->mode.mask, val);
+}
+
+static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int ret;
+
+	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
+	if (ret < 0)
+		return ret;
+
+	if (ret >> info->volt.sl_shift)
+		return REGULATOR_MODE_STANDBY;
+	else
+		return REGULATOR_MODE_NORMAL;
+}
+
+static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	struct da9055_volt_reg volt = info->volt;
+	int val = 0;
+
+	switch (mode) {
+	case REGULATOR_MODE_NORMAL:
+	case REGULATOR_MODE_FAST:
+		val = DA9055_LDO_MODE_SYNC;
+		break;
+	case REGULATOR_MODE_STANDBY:
+		val = DA9055_LDO_MODE_SLEEP;
+		break;
+	}
+
+	return da9055_reg_update(regulator->da9055, volt.reg_b,
+				 1 << volt.sl_shift,
+				 val << volt.sl_shift);
+}
+
+static int da9055_buck_get_current_limit(struct regulator_dev *rdev)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int ret;
+
+	ret = da9055_reg_read(regulator->da9055, DA9055_REG_BUCK_LIM);
+	if (ret < 0)
+		return ret;
+
+	ret &= info->mode.mask;
+	return da9055_current_limits[ret >> info->mode.shift];
+}
+
+static int da9055_buck_set_current_limit(struct regulator_dev *rdev, int min_uA,
+					 int max_uA)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int i;
+
+	for (i = ARRAY_SIZE(da9055_current_limits) - 1; i >= 0; i--) {
+		if ((min_uA <= da9055_current_limits[i]) &&
+		    (da9055_current_limits[i] <= max_uA))
+			return da9055_reg_update(regulator->da9055,
+						 DA9055_REG_BUCK_LIM,
+						 info->mode.mask,
+						 i << info->mode.shift);
+	}
+
+	return -EINVAL;
+}
+
+static int da9055_list_voltage(struct regulator_dev *rdev, unsigned selector)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+
+	if (selector >= rdev->desc->n_voltages)
+		return -EINVAL;
+
+	if (selector < info->volt.v_offset)
+		return 0;
+
+	selector -= info->volt.v_offset;
+	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
+}
+
+static int da9055_map_voltage(struct regulator_dev *rdev, int min_uV,
+			      int max_uV)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int sel, voltage;
+
+	if (min_uV < rdev->desc->min_uV)
+		min_uV = rdev->desc->min_uV;
+
+	sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
+	sel += info->volt.v_offset;
+
+	voltage = da9055_list_voltage(rdev, sel);
+	if (voltage < min_uV || voltage > max_uV)
+		return -EINVAL;
+
+	return sel;
+}
+
+static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	struct da9055_volt_reg volt = info->volt;
+	int ret, sel;
+
+	/*
+	 * There are two voltage register set A & B for voltage ramping but
+	 * either one of then can be active therefore we first determine
+	 * the active register set.
+	 */
+	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
+	if (ret < 0)
+		return ret;
+
+	ret &= info->conf.sel_mask;
+
+	/* Get the voltage for the active register set A/B */
+	if (ret == DA9055_REGUALTOR_SET_A)
+		ret = da9055_reg_read(regulator->da9055, volt.reg_a);
+	else
+		ret = da9055_reg_read(regulator->da9055, volt.reg_b);
+
+	if (ret < 0)
+		return ret;
+
+	sel = (ret & volt.v_mask);
+	if (sel <= volt.v_offset)
+		return 0;
+	else
+		return sel;
+}
+
+static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
+					    unsigned int selector)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int ret;
+
+	/*
+	 * Regulator register set A/B is not selected through GPIO therefore
+	 * we use default register set A for voltage ramping.
+	 */
+	if (regulator->reg_rselect == NO_GPIO) {
+		/* Select register set A */
+		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
+					info->conf.sel_mask, DA9055_SEL_REG_A);
+		if (ret < 0)
+			return ret;
+
+		/* Set the voltage */
+		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
+					 info->volt.v_mask, selector);
+	}
+
+	/*
+	 * Here regulator register set A/B is selected through GPIO.
+	 * Therefore we first determine the selected register set A/B and
+	 * then set the desired voltage for that register set A/B.
+	 */
+	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
+	if (ret < 0)
+		return ret;
+
+	ret &= info->conf.sel_mask;
+
+	/* Set the voltage */
+	if (ret == DA9055_REGUALTOR_SET_A)
+		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
+					 info->volt.v_mask, selector);
+	else
+		return da9055_reg_update(regulator->da9055, info->volt.reg_b,
+					 info->volt.v_mask, selector);
+}
+
+static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
+						int uV)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+	int ret;
+
+	/* Select register set B for suspend voltage ramping. */
+	if (regulator->reg_rselect == NO_GPIO) {
+		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
+					info->conf.sel_mask, DA9055_SEL_REG_B);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = da9055_map_voltage(rdev, uV, uV);
+	if (ret < 0)
+		return ret;
+
+	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
+				 info->volt.v_mask, ret);
+}
+
+static int da9055_suspend_enable(struct regulator_dev *rdev)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+
+	/* Select register set B for voltage ramping. */
+	if (regulator->reg_rselect == NO_GPIO)
+		return da9055_reg_update(regulator->da9055, info->conf.reg,
+					info->conf.sel_mask, DA9055_SEL_REG_B);
+	else
+		return 0;
+}
+
+static int da9055_suspend_disable(struct regulator_dev *rdev)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+
+	/* Diselect register set B. */
+	if (regulator->reg_rselect == NO_GPIO)
+		return da9055_reg_update(regulator->da9055, info->conf.reg,
+					info->conf.sel_mask, DA9055_SEL_REG_A);
+	else
+		return 0;
+}
+
+static struct regulator_ops da9055_buck_ops = {
+	.get_mode = da9055_buck_get_mode,
+	.set_mode = da9055_buck_set_mode,
+
+	.get_current_limit = da9055_buck_get_current_limit,
+	.set_current_limit = da9055_buck_set_current_limit,
+
+	.get_voltage_sel = da9055_regulator_get_voltage_sel,
+	.set_voltage_sel = da9055_regulator_set_voltage_sel,
+	.list_voltage = da9055_list_voltage,
+	.map_voltage = da9055_map_voltage,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+
+	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
+	.set_suspend_enable = da9055_suspend_enable,
+	.set_suspend_disable = da9055_suspend_disable,
+	.set_suspend_mode = da9055_buck_set_mode,
+};
+
+static struct regulator_ops da9055_ldo_ops = {
+	.get_mode = da9055_ldo_get_mode,
+	.set_mode = da9055_ldo_set_mode,
+
+	.get_voltage_sel = da9055_regulator_get_voltage_sel,
+	.set_voltage_sel = da9055_regulator_set_voltage_sel,
+	.list_voltage = da9055_list_voltage,
+	.map_voltage = da9055_map_voltage,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+
+	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
+	.set_suspend_enable = da9055_suspend_enable,
+	.set_suspend_disable = da9055_suspend_disable,
+	.set_suspend_mode = da9055_ldo_set_mode,
+
+};
+
+#define DA9055_LDO(_id, step, min, max, vbits, voffset) \
+{\
+	.reg_desc = {\
+		.name = #_id,\
+		.ops = &da9055_ldo_ops,\
+		.type = REGULATOR_VOLTAGE,\
+		.id = DA9055_ID_##_id,\
+		.n_voltages = (max - min) / step + 1 + (voffset), \
+		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
+		.enable_mask = 1, \
+		.min_uV = (min) * 1000,\
+		.uV_step = (step) * 1000,\
+		.owner = THIS_MODULE,\
+	},\
+	.conf = {\
+		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
+		.sel_mask = (1 << 4),\
+		.en_mask = 1,\
+	},\
+	.volt = {\
+		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
+		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
+		.sl_shift = 7,\
+		.v_offset = (voffset),\
+		.v_mask = (1 << (vbits)) - 1,\
+		.v_shift = (vbits),\
+	},\
+}
+
+#define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
+{\
+	.reg_desc = {\
+		.name = #_id,\
+		.ops = &da9055_buck_ops,\
+		.type = REGULATOR_VOLTAGE,\
+		.id = DA9055_ID_##_id,\
+		.n_voltages = (max - min) / step + 1 + (voffset), \
+		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
+		.enable_mask = 1,\
+		.min_uV = (min) * 1000,\
+		.uV_step = (step) * 1000,\
+		.owner = THIS_MODULE,\
+	},\
+	.conf = {\
+		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
+		.sel_mask = (1 << 4),\
+		.en_mask = 1,\
+	},\
+	.volt = {\
+		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
+		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
+		.sl_shift = 7,\
+		.v_offset = (voffset),\
+		.v_mask = (1 << (vbits)) - 1,\
+		.v_shift = (vbits),\
+	},\
+	.mode = {\
+		.reg = DA9055_REG_BCORE_MODE,\
+		.mask = (mbits),\
+		.shift = (sbits),\
+	},\
+}
+
+static struct da9055_regulator_info da9055_regulator_info[] = {
+	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
+	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
+	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
+	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
+	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
+	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
+	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
+	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
+};
+
+/*
+ * Configures regulator to be controlled either through GPIO 1 or 2.
+ * GPIO can control regulator state and/or select the regulator register
+ * set A/B for voltage ramping.
+ */
+static __devinit int da9055_gpio_init(struct da9055_regulator *regulator,
+				      struct regulator_config *config,
+				      struct da9055_pdata *pdata, int id)
+{
+	struct da9055_regulator_info *info = regulator->info;
+	int ret = 0;
+
+	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
+		char name[18];
+		int gpio_mux = pdata->gpio_ren[id];
+
+		config->ena_gpio = pdata->ena_gpio[id];
+		config->ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
+		config->ena_gpio_invert = 1;
+
+		/*
+		 * GPI pin is muxed with regulator to control the
+		 * regulator state.
+		 */
+		sprintf(name, "DA9055 GPI %d", gpio_mux);
+		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
+					    name);
+		if (ret < 0)
+			goto err;
+
+		/*
+		 * Let the regulator know that its state is controlled
+		 * through GPI.
+		 */
+		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
+					DA9055_E_GPI_MASK,
+					pdata->reg_ren[id]
+					<< DA9055_E_GPI_SHIFT);
+		if (ret < 0)
+			goto err;
+	}
+
+	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
+		char name[18];
+		int gpio_mux = pdata->gpio_rsel[id];
+
+		regulator->reg_rselect = pdata->reg_rsel[id];
+
+		/*
+		 * GPI pin is muxed with regulator to select the
+		 * regulator register set A/B for voltage ramping.
+		 */
+		sprintf(name, "DA9055 GPI %d", gpio_mux);
+		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
+					    name);
+		if (ret < 0)
+			goto err;
+
+		/*
+		 * Let the regulator know that its register set A/B
+		 * will be selected through GPI for voltage ramping.
+		 */
+		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
+					DA9055_V_GPI_MASK,
+					pdata->reg_rsel[id]
+					<< DA9055_V_GPI_SHIFT);
+	}
+
+err:
+	return ret;
+}
+
+static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
+{
+	struct da9055_regulator *regulator = data;
+
+	regulator_notifier_call_chain(regulator->rdev,
+				      REGULATOR_EVENT_OVER_CURRENT, NULL);
+
+	return IRQ_HANDLED;
+}
+
+static inline struct da9055_regulator_info *find_regulator_info(int id)
+{
+	struct da9055_regulator_info *info;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
+		info = &da9055_regulator_info[i];
+		if (info->reg_desc.id == id)
+			return info;
+	}
+
+	return NULL;
+}
+
+static int __devinit da9055_regulator_probe(struct platform_device *pdev)
+{
+	struct regulator_config config = { };
+	struct da9055_regulator *regulator;
+	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
+	struct da9055_pdata *pdata = da9055->dev->platform_data;
+	int ret, irq;
+
+	if (pdata == NULL || pdata->regulators[pdev->id] == NULL)
+		return -ENODEV;
+
+	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
+				 GFP_KERNEL);
+	if (!regulator)
+		return -ENOMEM;
+
+	regulator->info = find_regulator_info(pdev->id);
+	if (regulator->info == NULL) {
+		dev_err(&pdev->dev, "invalid regulator ID specified\n");
+		return -EINVAL;
+	}
+
+	regulator->da9055 = da9055;
+	config.dev = &pdev->dev;
+	config.driver_data = regulator;
+	config.regmap = da9055->regmap;
+
+	if (pdata && pdata->regulators)
+		config.init_data = pdata->regulators[pdev->id];
+
+	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
+	if (ret < 0)
+		return ret;
+
+	regulator->rdev = regulator_register(&regulator->info->reg_desc,
+					     &config);
+	if (IS_ERR(regulator->rdev)) {
+		dev_err(&pdev->dev, "Failed to register regulator %s\n",
+			regulator->info->reg_desc.name);
+		ret = PTR_ERR(regulator->rdev);
+		return ret;
+	}
+
+	/* Only LDO 5 and 6 has got the over current interrupt */
+	if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
+		irq = platform_get_irq_byname(pdev, "REGULATOR");
+		irq = regmap_irq_get_virq(da9055->irq_data, irq);
+		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+						da9055_ldo5_6_oc_irq,
+						IRQF_TRIGGER_HIGH |
+						IRQF_ONESHOT |
+						IRQF_PROBE_SHARED,
+						pdev->name, regulator);
+		if (ret != 0) {
+			if (ret != -EBUSY) {
+				dev_err(&pdev->dev,
+				"Failed to request Regulator IRQ %d: %d\n",
+				irq, ret);
+				goto err_regulator;
+			}
+		}
+	}
+
+	platform_set_drvdata(pdev, regulator);
+
+	return 0;
+
+err_regulator:
+	regulator_unregister(regulator->rdev);
+	return ret;
+}
+
+static int __devexit da9055_regulator_remove(struct platform_device *pdev)
+{
+	struct da9055_regulator *regulator = platform_get_drvdata(pdev);
+
+	regulator_unregister(regulator->rdev);
+
+	return 0;
+}
+
+static struct platform_driver da9055_regulator_driver = {
+	.probe = da9055_regulator_probe,
+	.remove = __devexit_p(da9055_regulator_remove),
+	.driver = {
+		.name = "da9055-regulator",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init da9055_regulator_init(void)
+{
+	return platform_driver_register(&da9055_regulator_driver);
+}
+subsys_initcall(da9055_regulator_init);
+
+static void __exit da9055_regulator_exit(void)
+{
+	platform_driver_unregister(&da9055_regulator_driver);
+}
+module_exit(da9055_regulator_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-regulator");