Message-Id: <1343932033-911-1-git-send-email-swarren@wwwdotorg.org>
Date:	Thu,  2 Aug 2012 12:27:13 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org,
	Laxman Dewangan <ldewangan@...dia.com>,
	Gyungoh Yoo <jack.yoo@...im-ic.com>,
	Stephen Warren <swarren@...dia.com>
Subject: [PATCH] regulator: add MAX8907 driver

From: Gyungoh Yoo <jack.yoo@...im-ic.com>

The MAX8907 is an I2C-based power-management IC containing voltage
regulators, a reset controller, a real-time clock, and a touch-screen
controller.

The original driver was written by:
* Gyungoh Yoo <jack.yoo@...im-ic.com>

Various fixes and enhancements by:
* Jin Park <jinyoungp@...dia.com>
* Tom Cherry <tcherry@...dia.com>
* Prashant Gaikwad <pgaikwad@...dia.com>
* Dan Willemsen <dwillemsen@...dia.com>
* Laxman Dewangan <ldewangan@...dia.com>

During upstreaming, I (swarren):
* Converted to regmap.
* Allowed probing from device tree.
* Reworked the regulator driver to be represented as a single device that
  provides multiple regulators, rather than as a device per regulator. It
  seems like this is more common?
* Added ability to specify supplies for each regulator.
* Renamed from max8907c->max8907, since the driver covers at least the
  C and B revisions.
* Removed list_voltage/get_voltage from WLED regulator, since it's a
  current regulator not a voltage regulator.
* General cleanup.

Signed-off-by: Gyungoh Yoo <jack.yoo@...im-ic.com>
Signed-off-by: Stephen Warren <swarren@...dia.com>
---
 drivers/regulator/Kconfig             |    8 +
 drivers/regulator/Makefile            |    1 +
 drivers/regulator/max8907-regulator.c |  606 +++++++++++++++++++++++++++++++++
 3 files changed, 615 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/max8907-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 4e932cc..1c6320c 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -172,6 +172,14 @@ config REGULATOR_MAX8660
 	  This driver controls a Maxim 8660/8661 voltage output
 	  regulator via I2C bus.
 
+config REGULATOR_MAX8907
+	tristate "Maxim 8907 voltage regulator"
+	depends on MFD_MAX8907
+	help
+	  This driver controls a Maxim 8907 voltage output regulator
+	  via I2C bus. The provided regulator is suitable for Tegra
+	  chip to control Step-Down DC-DC and LDOs.
+
 config REGULATOR_MAX8925
 	tristate "Maxim MAX8925 Power Management IC"
 	depends on MFD_MAX8925
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 3342615..3a0dbc5 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_LP8788) += lp8788-ldo.o
 obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_MAX8649)	+= max8649.o
 obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o
+obj-$(CONFIG_REGULATOR_MAX8907) += max8907-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
 obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
diff --git a/drivers/regulator/max8907-regulator.c b/drivers/regulator/max8907-regulator.c
new file mode 100644
index 0000000..a244398
--- /dev/null
+++ b/drivers/regulator/max8907-regulator.c
@@ -0,0 +1,606 @@
+/*
+ * max8907-regulator.c -- support regulators in max8907
+ *
+ * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@...im-ic.com>
+ * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Portions based on drivers/regulator/tps65910-regulator.c,
+ *     Copyright 2010 Texas Instruments Inc.
+ *     Author: Graeme Gregory <gg@...mlogic.co.uk>
+ *     Author: Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>
+ *
+ * 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/err.h>
+#include <linux/init.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max8907.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define MAX8907_II2RR_VERSION_MASK	0xF0
+#define MAX8907_II2RR_VERSION_REV_A	0x00
+#define MAX8907_II2RR_VERSION_REV_B	0x10
+#define MAX8907_II2RR_VERSION_REV_C	0x30
+
+struct max8907_regulator_info {
+	u32 min_uV;
+	u32 max_uV;
+	u32 step_uV;
+	u8 reg_base;
+	struct regulator_desc desc;
+};
+
+struct max8907_regulator {
+	struct max8907_regulator_info info[MAX8907_NUM_REGULATORS];
+	struct regulator_dev *rdev[MAX8907_NUM_REGULATORS];
+};
+
+#define REG_MBATT() \
+	{ \
+		.desc = { \
+			.supply_name = "mbatt", \
+			.name = "MBATT", \
+			.id = MAX8907_MBATT, \
+			.ops = &max8907_mbatt_ops, \
+			.type = REGULATOR_VOLTAGE, \
+			.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define REG_LDO(ids, supply, base, min, max, step) \
+	{ \
+		.min_uV = (min), \
+		.max_uV = (max), \
+		.step_uV = (step), \
+		.reg_base = (base), \
+		.desc = { \
+			.supply_name = supply, \
+			.name = #ids, \
+			.id = MAX8907_##ids, \
+			.n_voltages = ((max) - (min)) / (step) + 1, \
+			.ops = &max8907_ldo_ops, \
+			.type = REGULATOR_VOLTAGE, \
+			.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define REG_FIXED(ids, supply, voltage) \
+	{ \
+		.min_uV = (voltage), \
+		.max_uV = (voltage), \
+		.desc = { \
+			.supply_name = supply, \
+			.name = #ids, \
+			.id = MAX8907_##ids, \
+			.n_voltages = 1, \
+			.ops = &max8907_fixed_ops, \
+			.type = REGULATOR_VOLTAGE, \
+			.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define REG_OUT5V(ids, supply, base, voltage) \
+	{ \
+		.min_uV = (voltage), \
+		.max_uV = (voltage), \
+		.reg_base = (base), \
+		.desc = { \
+			.supply_name = supply, \
+			.name = #ids, \
+			.id = MAX8907_##ids, \
+			.n_voltages = 1, \
+			.ops = &max8907_out5v_ops, \
+			.type = REGULATOR_VOLTAGE, \
+			.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define REG_BBAT(ids, supply, base, min, max, step) \
+	{ \
+		.min_uV = (min), \
+		.max_uV = (max), \
+		.step_uV = (step), \
+		.reg_base = (base), \
+		.desc = { \
+			.supply_name = supply, \
+			.name = #ids, \
+			.id = MAX8907_##ids, \
+			.n_voltages = ((max) - (min)) / (step) + 1, \
+			.ops = &max8907_bbat_ops, \
+			.type = REGULATOR_VOLTAGE, \
+			.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define REG_WLED(ids, supply, base, voltage) \
+	{ \
+		.min_uV = (voltage), \
+		.max_uV = (voltage), \
+		.reg_base = (base), \
+		.desc = { \
+			.supply_name = supply, \
+			.name = #ids, \
+			.id = MAX8907_##ids, \
+			.n_voltages = 1, \
+			.ops = &max8907_wled_ops, \
+			.type = REGULATOR_CURRENT, \
+			.owner = THIS_MODULE, \
+		}, \
+	}
+
+#define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), 750000, 3900000, 50000)
+#define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), 650000, 2225000, 25000)
+
+static int max8907_regulator_list_voltage(struct regulator_dev *dev,
+					  unsigned index);
+static int max8907_regulator_ldo_set_voltage(struct regulator_dev *dev,
+					     int min_uV, int max_uV,
+					     unsigned *selector);
+static int max8907_regulator_bbat_set_voltage(struct regulator_dev *dev,
+					      int min_uV, int max_uV,
+					      unsigned *selector);
+static int max8907_regulator_ldo_get_voltage(struct regulator_dev *dev);
+static int max8907_regulator_fixed_get_voltage(struct regulator_dev *dev);
+static int max8907_regulator_bbat_get_voltage(struct regulator_dev *dev);
+static int max8907_regulator_wled_set_current_limit(struct regulator_dev *dev,
+						    int min_uA, int max_uA);
+static int max8907_regulator_wled_get_current_limit(struct regulator_dev *dev);
+static int max8907_regulator_ldo_enable(struct regulator_dev *dev);
+static int max8907_regulator_out5v_enable(struct regulator_dev *dev);
+static int max8907_regulator_ldo_disable(struct regulator_dev *dev);
+static int max8907_regulator_out5v_disable(struct regulator_dev *dev);
+static int max8907_regulator_ldo_is_enabled(struct regulator_dev *dev);
+static int max8907_regulator_out5v_is_enabled(struct regulator_dev *dev);
+
+static struct regulator_ops max8907_mbatt_ops = {
+};
+
+static struct regulator_ops max8907_ldo_ops = {
+	.list_voltage = max8907_regulator_list_voltage,
+	.set_voltage = max8907_regulator_ldo_set_voltage,
+	.get_voltage = max8907_regulator_ldo_get_voltage,
+	.enable = max8907_regulator_ldo_enable,
+	.disable = max8907_regulator_ldo_disable,
+	.is_enabled = max8907_regulator_ldo_is_enabled,
+};
+
+static struct regulator_ops max8907_fixed_ops = {
+	.list_voltage = max8907_regulator_list_voltage,
+	.get_voltage = max8907_regulator_fixed_get_voltage,
+};
+
+static struct regulator_ops max8907_out5v_ops = {
+	.list_voltage = max8907_regulator_list_voltage,
+	.get_voltage = max8907_regulator_fixed_get_voltage,
+	.enable = max8907_regulator_out5v_enable,
+	.disable = max8907_regulator_out5v_disable,
+	.is_enabled = max8907_regulator_out5v_is_enabled,
+};
+
+static struct regulator_ops max8907_bbat_ops = {
+	.list_voltage = max8907_regulator_list_voltage,
+	.set_voltage = max8907_regulator_bbat_set_voltage,
+	.get_voltage = max8907_regulator_bbat_get_voltage,
+};
+
+static struct regulator_ops max8907_wled_ops = {
+	.set_current_limit = max8907_regulator_wled_set_current_limit,
+	.get_current_limit = max8907_regulator_wled_get_current_limit,
+};
+
+static struct max8907_regulator_info max8907_regulators[] = {
+	REG_MBATT(),
+	REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000),
+	REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500),
+	REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000),
+	LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1),
+	LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2),
+	LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3),
+	LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4),
+	LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5),
+	LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6),
+	LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7),
+	LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8),
+	LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9),
+	LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10),
+	LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11),
+	LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12),
+	LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13),
+	LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14),
+	LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15),
+	LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16),
+	LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17),
+	LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18),
+	LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19),
+	LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20),
+	REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000),
+	REG_OUT5V(OUT33V, "mbatt",  MAX8907_REG_OUT33VEN, 3300000),
+	REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG, 2400000, 3000000, 200000),
+	REG_FIXED(SDBY, "MBATT", 1200000),
+	REG_FIXED(VRTC, "MBATT", 3300000),
+	REG_WLED(WLED, "lxw", MAX8907_REG_ILED_CNTL, 0),
+};
+
+static int max8907_regulator_list_voltage(struct regulator_dev *rdev,
+					  unsigned index)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+
+	return info->min_uV + info->step_uV * index;
+}
+
+static int max8907_regulator_ldo_set_voltage(struct regulator_dev *rdev,
+					     int min_uV, int max_uV,
+					     unsigned *selector)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	int val;
+
+	if (min_uV < info->min_uV || max_uV > info->max_uV)
+		return -EDOM;
+
+	val = (min_uV - info->min_uV) / info->step_uV;
+	*selector = val;
+
+	return regmap_write(rdev->regmap, info->reg_base + MAX8907_VOUT, val);
+}
+
+static int max8907_regulator_bbat_set_voltage(struct regulator_dev *rdev,
+					      int min_uV, int max_uV,
+					      unsigned *selector)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	int val;
+
+	if (min_uV < info->min_uV || max_uV > info->max_uV)
+		return -EDOM;
+
+	val = (min_uV - info->min_uV) / info->step_uV;
+	*selector = val;
+
+	return regmap_update_bits(rdev->regmap, info->reg_base,
+				  MAX8907_MASK_VBBATTCV, val);
+}
+
+static int max8907_regulator_ldo_get_voltage(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	unsigned int val;
+
+	regmap_read(rdev->regmap, info->reg_base + MAX8907_VOUT, &val);
+	return val * info->step_uV + info->min_uV;
+}
+
+static int max8907_regulator_fixed_get_voltage(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+
+	return info->min_uV;
+}
+
+static int max8907_regulator_bbat_get_voltage(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	unsigned int val;
+
+	regmap_read(rdev->regmap, info->reg_base, &val);
+	return (val & MAX8907_MASK_VBBATTCV) * info->step_uV + info->min_uV;
+}
+
+static int max8907_regulator_wled_set_current_limit(struct regulator_dev *rdev,
+						    int min_uA, int max_uA)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+
+	if (min_uA > 25500)
+		return -EDOM;
+
+	return regmap_write(rdev->regmap, info->reg_base, min_uA / 100);
+}
+
+static int max8907_regulator_wled_get_current_limit(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	unsigned int val;
+
+	regmap_read(rdev->regmap, info->reg_base, &val);
+	return val * 100;
+}
+
+static int max8907_regulator_ldo_enable(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	unsigned int reg = MAX8907_MASK_LDO_EN | MAX8907_MASK_LDO_SEQ;
+
+	return regmap_update_bits(rdev->regmap, info->reg_base + MAX8907_CTL,
+				  reg, reg);
+}
+
+static int max8907_regulator_out5v_enable(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+
+	return regmap_update_bits(rdev->regmap, info->reg_base,
+				  MAX8907_MASK_OUT5V_VINEN |
+				  MAX8907_MASK_OUT5V_ENSRC |
+				  MAX8907_MASK_OUT5V_EN,
+				  MAX8907_MASK_OUT5V_ENSRC |
+				  MAX8907_MASK_OUT5V_EN);
+}
+
+static int max8907_regulator_ldo_disable(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+
+	return regmap_update_bits(rdev->regmap, info->reg_base + MAX8907_CTL,
+				  MAX8907_MASK_LDO_EN | MAX8907_MASK_LDO_SEQ,
+				  MAX8907_MASK_LDO_SEQ);
+}
+
+static int max8907_regulator_out5v_disable(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+
+	return regmap_update_bits(rdev->regmap, info->reg_base,
+				  MAX8907_MASK_OUT5V_VINEN |
+				  MAX8907_MASK_OUT5V_ENSRC |
+				  MAX8907_MASK_OUT5V_EN,
+				  MAX8907_MASK_OUT5V_ENSRC);
+}
+
+static int max8907_regulator_ldo_is_enabled(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(rdev->regmap, info->reg_base + MAX8907_CTL, &val);
+	if (ret < 0)
+		return -EDOM;
+
+	return (val & MAX8907_MASK_LDO_EN) || !(val & MAX8907_MASK_LDO_SEQ);
+}
+
+static int max8907_regulator_out5v_is_enabled(struct regulator_dev *rdev)
+{
+	struct max8907_regulator *pmic = rdev_get_drvdata(rdev);
+	int id = rdev_get_id(rdev);
+	const struct max8907_regulator_info *info = &pmic->info[id];
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(rdev->regmap, info->reg_base, &val);
+	if (ret < 0)
+		return -EDOM;
+
+	if ((val &
+	     (MAX8907_MASK_OUT5V_VINEN | MAX8907_MASK_OUT5V_ENSRC |
+	      MAX8907_MASK_OUT5V_EN))
+	    == MAX8907_MASK_OUT5V_ENSRC)
+		return 1;
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+
+#define MATCH(_name, _id) \
+	{ \
+		.name = #_name, \
+		.driver_data = (void *)&max8907_regulators[MAX8907_##_id], \
+	}
+
+static struct of_regulator_match max8907_matches[] = {
+	MATCH(mbatt, MBATT),
+	MATCH(sd1, SD1),
+	MATCH(sd2, SD2),
+	MATCH(sd3, SD3),
+	MATCH(ldo1, LDO1),
+	MATCH(ldo2, LDO2),
+	MATCH(ldo3, LDO3),
+	MATCH(ldo4, LDO4),
+	MATCH(ldo5, LDO5),
+	MATCH(ldo6, LDO6),
+	MATCH(ldo7, LDO7),
+	MATCH(ldo8, LDO8),
+	MATCH(ldo9, LDO9),
+	MATCH(ldo10, LDO10),
+	MATCH(ldo11, LDO11),
+	MATCH(ldo12, LDO12),
+	MATCH(ldo13, LDO13),
+	MATCH(ldo14, LDO14),
+	MATCH(ldo15, LDO15),
+	MATCH(ldo16, LDO16),
+	MATCH(ldo17, LDO17),
+	MATCH(ldo18, LDO18),
+	MATCH(ldo19, LDO19),
+	MATCH(ldo20, LDO20),
+	MATCH(out5v, OUT5V),
+	MATCH(out33v, OUT33V),
+	MATCH(bbat, BBAT),
+	MATCH(sdby, SDBY),
+	MATCH(vrtc, VRTC),
+	MATCH(wled, WLED),
+};
+
+static int max8907_regulator_parse_dt(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.parent->of_node;
+	struct device_node *regulators;
+	int ret;
+
+	if (!pdev->dev.parent->of_node)
+		return 0;
+
+	regulators = of_find_node_by_name(np, "regulators");
+	if (!regulators) {
+		dev_err(&pdev->dev, "regulators node not found\n");
+		return -EINVAL;
+	}
+
+	ret = of_regulator_match(pdev->dev.parent, regulators,
+				 max8907_matches,
+				 ARRAY_SIZE(max8907_matches));
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+#else
+static int max8907_regulator_parse_dt(struct platform_device *pdev)
+{
+	return 0;
+}
+#endif
+
+static __devinit int max8907_regulator_probe(struct platform_device *pdev)
+{
+	struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
+	struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev);
+	int ret;
+	struct max8907_regulator *pmic;
+	unsigned int version;
+	int i;
+	struct regulator_config config = {};
+	struct regulator_init_data *idata;
+	const char *mbatt_rail_name = NULL;
+
+	ret = max8907_regulator_parse_dt(pdev);
+	if (ret)
+		return ret;
+
+	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
+	if (!pmic) {
+		dev_err(&pdev->dev, "Failed to alloc pmic\n");
+		return -ENOMEM;
+	}
+	platform_set_drvdata(pdev, pmic);
+
+	memcpy(pmic->info, max8907_regulators, sizeof(pmic->info));
+
+	/* Backwards compatibility with MAX8907B; SD1 uses different voltages */
+	regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &version);
+	if ((version & MAX8907_II2RR_VERSION_MASK) ==
+	    MAX8907_II2RR_VERSION_REV_B) {
+		pmic->info[MAX8907_SD1].min_uV = 637500;
+		pmic->info[MAX8907_SD1].max_uV = 1425000;
+		pmic->info[MAX8907_SD1].step_uV = 12500;
+	}
+
+	for (i = 0; i < MAX8907_NUM_REGULATORS; i++) {
+		config.dev = pdev->dev.parent;
+		if (pdata)
+			idata = pdata->init_data[i];
+		else
+			idata = max8907_matches[i].init_data;
+		config.init_data = idata;
+		config.driver_data = pmic;
+		config.regmap = max8907->regmap_gen;
+		config.of_node = max8907_matches[i].of_node;
+
+		switch (pmic->info[i].desc.id) {
+		case MAX8907_MBATT:
+			mbatt_rail_name = idata->constraints.name;
+			break;
+		case MAX8907_BBAT:
+		case MAX8907_SDBY:
+		case MAX8907_VRTC:
+			idata->supply_regulator = mbatt_rail_name;
+			break;
+		}
+
+		pmic->rdev[i] = regulator_register(&pmic->info[i].desc,
+						   &config);
+		if (IS_ERR(pmic->rdev[i])) {
+			dev_err(&pdev->dev,
+				"failed to register %s regulator\n",
+				pmic->info[i].desc.name);
+			ret = PTR_ERR(pmic->rdev[i]);
+			goto err_unregister_regulator;
+		}
+	}
+
+	return 0;
+
+err_unregister_regulator:
+	while (--i >= 0)
+		regulator_unregister(pmic->rdev[i]);
+	return ret;
+}
+
+static __devexit int max8907_regulator_remove(struct platform_device *pdev)
+{
+	struct max8907_regulator *pmic;
+	int i;
+
+	for (i = 0; i < MAX8907_NUM_REGULATORS; i++)
+		regulator_unregister(pmic->rdev[i]);
+
+	return 0;
+}
+
+static struct platform_driver max8907_regulator_driver = {
+	.driver = {
+		   .name = "max8907-regulator",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = max8907_regulator_probe,
+	.remove = __devexit_p(max8907_regulator_remove),
+};
+
+static int __init max8907_regulator_init(void)
+{
+	return platform_driver_register(&max8907_regulator_driver);
+}
+
+subsys_initcall(max8907_regulator_init);
+
+static void __exit max8907_reg_exit(void)
+{
+	platform_driver_unregister(&max8907_regulator_driver);
+}
+
+module_exit(max8907_reg_exit);
+
+MODULE_DESCRIPTION("MAX8907 regulator driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@...im-ic.com>");
+MODULE_LICENSE("GPL v2");
-- 
1.7.0.4

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