Date:	Thu, 11 Oct 2012 12:06:27 +0530
From:	Ashish Jangam <ashish.jangam@...tcummins.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Liam Girdwood <lrg@...com>, Samuel Ortiz <sameo@...ux.intel.com>,
	David Dajun Chen <dchen@...semi.com>,
	<linux-kernel@...r.kernel.org>
Subject: [Patch v3 2/7] Regulator: DA9055 Regulator driver

This is the Regulator patch for the DA9055 PMIC and has got dependency on
the DA9055 MFD core.

This patch support all of the DA9055 regulators. The output voltages are
fully programmable through I2C interface only. The platform data with regulation
constraints is passed down from the board to the regulator.

This patch is functionaly tested on SMDK6410 board. DA9055 Evaluation board
was connected to the SMDK6410 board.

Signed-off-by: David Dajun Chen <dchen@...semi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@...tcummins.com>
---
changes since version v3:
- Use of regulator framework API regulator_map_voltage_linear()
   and regulator_list_voltage_linear().
- Modify comments to indicate GPIO pins are muxed.
- Get the GPIO number from platform data.
changes since v2:
- restructuring of GPIO regulator initialization code.
---
 drivers/regulator/Kconfig            |   10 +
 drivers/regulator/Makefile           |    1 +
 drivers/regulator/da9055-regulator.c |  659 ++++++++++++++++++++++++++++++++++
 include/linux/mfd/da9055/pdata.h     |   27 ++-
 4 files changed, 694 insertions(+), 3 deletions(-)
 create mode 100644 drivers/regulator/da9055-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 129c827..0bd6db1 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_ANATOP
 	tristate "Freescale i.MX on-chip ANATOP LDO regulators"
 	depends on MFD_ANATOP
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 3a0dbc5..950b38b 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
 obj-$(CONFIG_REGULATOR_ARIZONA) += arizona-micsupp.o arizona-ldo1.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_GPIO) += gpio-regulator.o
diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c
new file mode 100644
index 0000000..9129b27
--- /dev/null
+++ b/drivers/regulator/da9055-regulator.c
@@ -0,0 +1,659 @@
+/*
+* Regulator driver for DA9055 PMIC
+*
+* Copyright(c) 2012 Dialog Semiconductor Ltd.
+*
+* Author: David Dajun Chen <dchen@...semi.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;
+	int step_uV;
+	int min_uV;
+	int max_uV;
+	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_IDLE:
+	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_IDLE:
+	case REGULATOR_MODE_STANDBY:
+		val = DA9055_LDO_MODE_SLEEP;
+	}
+
+	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, val = 0;
+
+	if (min_uA > da9055_current_limits[DA9055_MAX_UA] ||
+	    max_uA < da9055_current_limits[DA9055_MIN_UA])
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(da9055_current_limits); i++) {
+		if (min_uA <= da9055_current_limits[i]) {
+			val = i;
+			break;
+		}
+	}
+
+	return da9055_reg_update(regulator->da9055, DA9055_REG_BUCK_LIM,
+				info->mode.mask, val << info->mode.shift);
+}
+
+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 activer 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) - volt.v_offset);
+
+	return sel;
+}
+
+static int da9055_regulator_set_voltage_bits(struct regulator_dev *rdev,
+					     unsigned int reg,
+					     unsigned int selector)
+{
+	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
+	struct da9055_regulator_info *info = regulator->info;
+
+	/* Takes care of voltage range that does not start with 0 offset. */
+	selector += info->volt.v_offset;
+
+	/* Set the voltage */
+	return da9055_reg_update(regulator->da9055, reg, info->volt.v_mask,
+				 selector);
+
+}
+
+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_regulator_set_voltage_bits(rdev, info->volt.reg_a,
+							 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_regulator_set_voltage_bits(rdev, info->volt.reg_a,
+							 selector);
+
+	return da9055_regulator_set_voltage_bits(rdev, info->volt.reg_b,
+						 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. */
+	ret = da9055_reg_update(regulator->da9055, info->conf.reg,
+				info->conf.sel_mask, DA9055_SEL_REG_B);
+	if (ret < 0)
+		return ret;
+
+	ret = regulator_map_voltage_linear(rdev, uV, uV);
+	if (ret < 0)
+		return ret;
+
+	return da9055_regulator_set_voltage_bits(rdev, info->volt.reg_b, 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. */
+	return da9055_reg_update(regulator->da9055, info->conf.reg,
+				info->conf.sel_mask, DA9055_SEL_REG_B);
+}
+
+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. */
+	return da9055_reg_update(regulator->da9055, info->conf.reg,
+				info->conf.sel_mask, DA9055_SEL_REG_A);
+}
+
+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 = regulator_list_voltage_linear,
+	.map_voltage = regulator_map_voltage_linear,
+	.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 = regulator_list_voltage_linear,
+	.map_voltage = regulator_map_voltage_linear,
+	.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, \
+		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
+		.enable_mask = 1, \
+		.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),\
+	},\
+	.min_uV = (min) * 1000,\
+	.max_uV = (max) * 1000,\
+	.step_uV = (step) * 1000,\
+}
+
+#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, \
+		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
+		.enable_mask = 1,\
+		.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),\
+	},\
+	.min_uV = (min) * 1000,\
+	.max_uV = (max) * 1000,\
+	.step_uV = (step) * 1000,\
+}
+
+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_ren[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@...semi.com>");
+MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-regulator");
diff --git a/include/linux/mfd/da9055/pdata.h b/include/linux/mfd/da9055/pdata.h
index 147293b..f87a6c1 100644
--- a/include/linux/mfd/da9055/pdata.h
+++ b/include/linux/mfd/da9055/pdata.h
@@ -25,8 +25,29 @@ struct da9055_pdata {
 	int gpio_base;
 
 	struct regulator_init_data *regulators[DA9055_MAX_REGULATORS];
-	bool reset_enable;		/* Enable RTC in RESET Mode */
-	enum gpio_select *gpio_rsel;	/* Select regulator set thru GPIO 1/2 */
-	enum gpio_select *gpio_ren;	/* Enable regulator thru GPIO 1/2 */
+	/* Enable RTC in RESET Mode */
+	bool reset_enable;
+	/*
+	 * GPI muxed pin to control
+	 * regulator state A/B, 0 if not available.
+	 */
+	int *gpio_ren;
+	/*
+	 * GPI muxed pin to control
+	 * regulator set, 0 if not available.
+	 */
+	int *gpio_rsel;
+	/*
+	 * Regulator mode control bits value (GPI offset) that
+	 * that controls the regulator state, 0 if not available.
+	 */
+	enum gpio_select *reg_ren;
+	/*
+	 * Regulator mode control bits value (GPI offset) that
+	 * controls the regulator set A/B, 0 if  not available.
+	 */
+	enum gpio_select *reg_rsel;
+	/* GPIOs to enable regulator, 0 if not available */
+	int *ena_gpio;
 };
 #endif /* __DA9055_PDATA_H */
-- 
1.7.0.4


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