regulator: add new regulator driver for lp872x

This driver supports TI/National LP8720, LP8725 PMIC.

Signed-off-by: Milo(Woogyom) Kim <[e-mail]>
Reviewed-by: Axel Lin <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/Kconfig

···
 	 Say Y here to support the voltage regulators and convertors
 	 on National Semiconductors LP3972 PMIC
 
+config REGULATOR_LP872X
+	tristate "TI/National Semiconductor LP8720/LP8725 voltage regulators"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  This driver supports LP8720/LP8725 PMIC
+
 config REGULATOR_PCF50633
 	tristate "NXP PCF50633 regulator driver"
         depends on MFD_PCF50633

drivers/regulator/Makefile

···
 obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
 obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
 obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
+obj-$(CONFIG_REGULATOR_LP872X) += lp872x.o
 obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
 obj-$(CONFIG_REGULATOR_MAX8649)	+= max8649.o
 obj-$(CONFIG_REGULATOR_MAX8660) += max8660.o

drivers/regulator/lp872x.c

···
+/*
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <[e-mail]>
+ *
+ * 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/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/regulator/lp872x.h>
+#include <linux/regulator/driver.h>
+#include <linux/platform_device.h>
+
+/* Registers : LP8720/8725 shared */
+#define LP872X_GENERAL_CFG		0x00
+#define LP872X_LDO1_VOUT		0x01
+#define LP872X_LDO2_VOUT		0x02
+#define LP872X_LDO3_VOUT		0x03
+#define LP872X_LDO4_VOUT		0x04
+#define LP872X_LDO5_VOUT		0x05
+
+/* Registers : LP8720 */
+#define LP8720_BUCK_VOUT1		0x06
+#define LP8720_BUCK_VOUT2		0x07
+#define LP8720_ENABLE			0x08
+
+/* Registers : LP8725 */
+#define LP8725_LILO1_VOUT		0x06
+#define LP8725_LILO2_VOUT		0x07
+#define LP8725_BUCK1_VOUT1		0x08
+#define LP8725_BUCK1_VOUT2		0x09
+#define LP8725_BUCK2_VOUT1		0x0A
+#define LP8725_BUCK2_VOUT2		0x0B
+#define LP8725_BUCK_CTRL		0x0C
+#define LP8725_LDO_CTRL			0x0D
+
+/* Mask/shift : LP8720/LP8725 shared */
+#define LP872X_VOUT_M			0x1F
+#define LP872X_START_DELAY_M		0xE0
+#define LP872X_START_DELAY_S		5
+#define LP872X_EN_LDO1_M		BIT(0)
+#define LP872X_EN_LDO2_M		BIT(1)
+#define LP872X_EN_LDO3_M		BIT(2)
+#define LP872X_EN_LDO4_M		BIT(3)
+#define LP872X_EN_LDO5_M		BIT(4)
+
+/* Mask/shift : LP8720 */
+#define LP8720_TIMESTEP_S		0		/* Addr 00h */
+#define LP8720_TIMESTEP_M		BIT(0)
+#define LP8720_EXT_DVS_M		BIT(2)
+#define LP8720_BUCK_FPWM_S		5		/* Addr 07h */
+#define LP8720_BUCK_FPWM_M		BIT(5)
+#define LP8720_EN_BUCK_M		BIT(5)		/* Addr 08h */
+#define LP8720_DVS_SEL_M		BIT(7)
+
+/* Mask/shift : LP8725 */
+#define LP8725_TIMESTEP_M		0xC0		/* Addr 00h */
+#define LP8725_TIMESTEP_S		6
+#define LP8725_BUCK1_EN_M		BIT(0)
+#define LP8725_DVS1_M			BIT(2)
+#define LP8725_DVS2_M			BIT(3)
+#define LP8725_BUCK2_EN_M		BIT(4)
+#define LP8725_BUCK_CL_M		0xC0		/* Addr 09h, 0Bh */
+#define LP8725_BUCK_CL_S		6
+#define LP8725_BUCK1_FPWM_S		1		/* Addr 0Ch */
+#define LP8725_BUCK1_FPWM_M		BIT(1)
+#define LP8725_BUCK2_FPWM_S		5
+#define LP8725_BUCK2_FPWM_M		BIT(5)
+#define LP8725_EN_LILO1_M		BIT(5)		/* Addr 0Dh */
+#define LP8725_EN_LILO2_M		BIT(6)
+
+/* PWM mode */
+#define LP872X_FORCE_PWM		1
+#define LP872X_AUTO_PWM			0
+
+#define LP8720_NUM_REGULATORS		6
+#define LP8725_NUM_REGULATORS		9
+#define EXTERN_DVS_USED			0
+#define MAX_DELAY			6
+
+/* dump registers in regmap-debugfs */
+#define MAX_REGISTERS			0x0F
+
+enum lp872x_id {
+	LP8720,
+	LP8725,
+};
+
+struct lp872x {
+	struct regmap *regmap;
+	struct device *dev;
+	enum lp872x_id chipid;
+	struct lp872x_platform_data *pdata;
+	struct regulator_dev **regulators;
+	int num_regulators;
+	enum lp872x_dvs_state dvs_pin;
+	int dvs_gpio;
+};
+
+/* LP8720/LP8725 shared voltage table for LDOs */
+static const unsigned int lp872x_ldo_vtbl[] = {
+	1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000,
+	1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000, 2000000,
+	2100000, 2200000, 2300000, 2400000, 2500000, 2600000, 2650000, 2700000,
+	2750000, 2800000, 2850000, 2900000, 2950000, 3000000, 3100000, 3300000,
+};
+
+/* LP8720 LDO4 voltage table */
+static const unsigned int lp8720_ldo4_vtbl[] = {
+	 800000,  850000,  900000, 1000000, 1100000, 1200000, 1250000, 1300000,
+	1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000,
+	1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
+	2400000, 2500000, 2600000, 2650000, 2700000, 2750000, 2800000, 2850000,
+};
+
+/* LP8725 LILO(Low Input Low Output) voltage table */
+static const unsigned int lp8725_lilo_vtbl[] = {
+	 800000,  850000,  900000,  950000, 1000000, 1050000, 1100000, 1150000,
+	1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
+	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
+	2600000, 2700000, 2800000, 2850000, 2900000, 3000000, 3100000, 3300000,
+};
+
+/* LP8720 BUCK voltage table */
+#define EXT_R		0	/* external resistor divider */
+static const unsigned int lp8720_buck_vtbl[] = {
+	  EXT_R,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
+	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
+	1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
+	1950000, 2000000, 2050000, 2100000, 2150000, 2200000, 2250000, 2300000,
+};
+
+/* LP8725 BUCK voltage table */
+static const unsigned int lp8725_buck_vtbl[] = {
+	 800000,  850000,  900000,  950000, 1000000, 1050000, 1100000, 1150000,
+	1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
+	1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
+	2400000, 2500000, 2600000, 2700000, 2800000, 2850000, 2900000, 3000000,
+};
+
+/* LP8725 BUCK current limit */
+static const unsigned int lp8725_buck_uA[] = {
+	460000, 780000, 1050000, 1370000,
+};
+
+static int lp872x_read_byte(struct lp872x *lp, u8 addr, u8 *data)
+{
+	int ret;
+	unsigned int val;
+
+	ret = regmap_read(lp->regmap, addr, &val);
+	if (ret < 0) {
+		dev_err(lp->dev, "failed to read 0x%.2x\n", addr);
+		return ret;
+	}
+
+	*data = (u8)val;
+	return 0;
+}
+
+static inline int lp872x_write_byte(struct lp872x *lp, u8 addr, u8 data)
+{
+	return regmap_write(lp->regmap, addr, data);
+}
+
+static inline int lp872x_update_bits(struct lp872x *lp, u8 addr,
+				unsigned int mask, u8 data)
+{
+	return regmap_update_bits(lp->regmap, addr, mask, data);
+}
+
+static int _rdev_to_offset(struct regulator_dev *rdev)
+{
+	enum lp872x_regulator_id id = rdev_get_id(rdev);
+
+	switch (id) {
+	case LP8720_ID_LDO1 ... LP8720_ID_BUCK:
+		return id;
+	case LP8725_ID_LDO1 ... LP8725_ID_BUCK2:
+		return id - LP8725_ID_BASE;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int lp872x_get_timestep_usec(struct lp872x *lp)
+{
+	enum lp872x_id chip = lp->chipid;
+	u8 val, mask, shift;
+	int *time_usec, size, ret;
+	int lp8720_time_usec[] = { 25, 50 };
+	int lp8725_time_usec[] = { 32, 64, 128, 256 };
+
+	switch (chip) {
+	case LP8720:
+		mask = LP8720_TIMESTEP_M;
+		shift = LP8720_TIMESTEP_S;
+		time_usec = &lp8720_time_usec[0];
+		size = ARRAY_SIZE(lp8720_time_usec);
+		break;
+	case LP8725:
+		mask = LP8725_TIMESTEP_M;
+		shift = LP8725_TIMESTEP_S;
+		time_usec = &lp8725_time_usec[0];
+		size = ARRAY_SIZE(lp8725_time_usec);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
+	if (ret)
+		return -EINVAL;
+
+	val = (val & mask) >> shift;
+	if (val >= size)
+		return -EINVAL;
+
+	return *(time_usec + val);
+}
+
+static int lp872x_regulator_enable_time(struct regulator_dev *rdev)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id regulator = rdev_get_id(rdev);
+	int time_step_us = lp872x_get_timestep_usec(lp);
+	int ret, offset;
+	u8 addr, val;
+
+	if (time_step_us < 0)
+		return -EINVAL;
+
+	switch (regulator) {
+	case LP8720_ID_LDO1 ... LP8720_ID_LDO5:
+	case LP8725_ID_LDO1 ... LP8725_ID_LILO2:
+		offset = _rdev_to_offset(rdev);
+		if (offset < 0)
+			return -EINVAL;
+
+		addr = LP872X_LDO1_VOUT + offset;
+		break;
+	case LP8720_ID_BUCK:
+		addr = LP8720_BUCK_VOUT1;
+		break;
+	case LP8725_ID_BUCK1:
+		addr = LP8725_BUCK1_VOUT1;
+		break;
+	case LP8725_ID_BUCK2:
+		addr = LP8725_BUCK2_VOUT1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = lp872x_read_byte(lp, addr, &val);
+	if (ret)
+		return ret;
+
+	val = (val & LP872X_START_DELAY_M) >> LP872X_START_DELAY_S;
+
+	return val > MAX_DELAY ? 0 : val * time_step_us;
+}
+
+static void lp872x_set_dvs(struct lp872x *lp, int gpio)
+{
+	enum lp872x_dvs_sel dvs_sel = lp->pdata->dvs->vsel;
+	enum lp872x_dvs_state state;
+
+	state = dvs_sel == SEL_V1 ? DVS_HIGH : DVS_LOW;
+	gpio_set_value(gpio, state);
+	lp->dvs_pin = state;
+}
+
+static u8 lp872x_select_buck_vout_addr(struct lp872x *lp,
+				enum lp872x_regulator_id buck)
+{
+	u8 val, addr;
+
+	if (lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val))
+		return 0;
+
+	switch (buck) {
+	case LP8720_ID_BUCK:
+		if (val & LP8720_EXT_DVS_M) {
+			addr = (lp->dvs_pin == DVS_HIGH) ?
+				LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
+		} else {
+			if (lp872x_read_byte(lp, LP8720_ENABLE, &val))
+				return 0;
+
+			addr = val & LP8720_DVS_SEL_M ?
+				LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
+		}
+		break;
+	case LP8725_ID_BUCK1:
+		if (val & LP8725_DVS1_M)
+			addr = LP8725_BUCK1_VOUT1;
+		else
+			addr = (lp->dvs_pin == DVS_HIGH) ?
+				LP8725_BUCK1_VOUT1 : LP8725_BUCK1_VOUT2;
+		break;
+	case LP8725_ID_BUCK2:
+		addr =  val & LP8725_DVS2_M ?
+			LP8725_BUCK2_VOUT1 : LP8725_BUCK2_VOUT2;
+		break;
+	default:
+		return 0;
+	}
+
+	return addr;
+}
+
+static bool lp872x_is_valid_buck_addr(u8 addr)
+{
+	switch (addr) {
+	case LP8720_BUCK_VOUT1:
+	case LP8720_BUCK_VOUT2:
+	case LP8725_BUCK1_VOUT1:
+	case LP8725_BUCK1_VOUT2:
+	case LP8725_BUCK2_VOUT1:
+	case LP8725_BUCK2_VOUT2:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static int lp872x_buck_set_voltage_sel(struct regulator_dev *rdev,
+					unsigned selector)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id buck = rdev_get_id(rdev);
+	u8 addr, mask = LP872X_VOUT_M;
+	struct lp872x_dvs *dvs = lp->pdata->dvs;
+
+	if (dvs && gpio_is_valid(dvs->gpio))
+		lp872x_set_dvs(lp, dvs->gpio);
+
+	addr = lp872x_select_buck_vout_addr(lp, buck);
+	if (!lp872x_is_valid_buck_addr(addr))
+		return -EINVAL;
+
+	return lp872x_update_bits(lp, addr, mask, selector);
+}
+
+static int lp872x_buck_get_voltage_sel(struct regulator_dev *rdev)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id buck = rdev_get_id(rdev);
+	u8 addr, val;
+	int ret;
+
+	addr = lp872x_select_buck_vout_addr(lp, buck);
+	if (!lp872x_is_valid_buck_addr(addr))
+		return -EINVAL;
+
+	ret = lp872x_read_byte(lp, addr, &val);
+	if (ret)
+		return ret;
+
+	return val & LP872X_VOUT_M;
+}
+
+static int lp8725_buck_set_current_limit(struct regulator_dev *rdev,
+					int min_uA, int max_uA)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id buck = rdev_get_id(rdev);
+	int i, max = ARRAY_SIZE(lp8725_buck_uA);
+	u8 addr, val;
+
+	switch (buck) {
+	case LP8725_ID_BUCK1:
+		addr = LP8725_BUCK1_VOUT2;
+		break;
+	case LP8725_ID_BUCK2:
+		addr = LP8725_BUCK2_VOUT2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	for (i = 0 ; i < max ; i++)
+		if (lp8725_buck_uA[i] >= min_uA &&
+			lp8725_buck_uA[i] <= max_uA)
+			break;
+
+	if (i == max)
+		return -EINVAL;
+
+	val = i << LP8725_BUCK_CL_S;
+
+	return lp872x_update_bits(lp, addr, LP8725_BUCK_CL_M, val);
+}
+
+static int lp8725_buck_get_current_limit(struct regulator_dev *rdev)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id buck = rdev_get_id(rdev);
+	u8 addr, val;
+	int ret;
+
+	switch (buck) {
+	case LP8725_ID_BUCK1:
+		addr = LP8725_BUCK1_VOUT2;
+		break;
+	case LP8725_ID_BUCK2:
+		addr = LP8725_BUCK2_VOUT2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = lp872x_read_byte(lp, addr, &val);
+	if (ret)
+		return ret;
+
+	val = (val & LP8725_BUCK_CL_M) >> LP8725_BUCK_CL_S;
+
+	return (val < ARRAY_SIZE(lp8725_buck_uA)) ?
+			lp8725_buck_uA[val] : -EINVAL;
+}
+
+static int lp872x_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id buck = rdev_get_id(rdev);
+	u8 addr, mask, shift, val;
+
+	switch (buck) {
+	case LP8720_ID_BUCK:
+		addr = LP8720_BUCK_VOUT2;
+		mask = LP8720_BUCK_FPWM_M;
+		shift = LP8720_BUCK_FPWM_S;
+		break;
+	case LP8725_ID_BUCK1:
+		addr = LP8725_BUCK_CTRL;
+		mask = LP8725_BUCK1_FPWM_M;
+		shift = LP8725_BUCK1_FPWM_S;
+		break;
+	case LP8725_ID_BUCK2:
+		addr = LP8725_BUCK_CTRL;
+		mask = LP8725_BUCK2_FPWM_M;
+		shift = LP8725_BUCK2_FPWM_S;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (mode == REGULATOR_MODE_FAST)
+		val = LP872X_FORCE_PWM << shift;
+	else if (mode == REGULATOR_MODE_NORMAL)
+		val = LP872X_AUTO_PWM << shift;
+	else
+		return -EINVAL;
+
+	return lp872x_update_bits(lp, addr, mask, val);
+}
+
+static unsigned int lp872x_buck_get_mode(struct regulator_dev *rdev)
+{
+	struct lp872x *lp = rdev_get_drvdata(rdev);
+	enum lp872x_regulator_id buck = rdev_get_id(rdev);
+	u8 addr, mask, val;
+	int ret;
+
+	switch (buck) {
+	case LP8720_ID_BUCK:
+		addr = LP8720_BUCK_VOUT2;
+		mask = LP8720_BUCK_FPWM_M;
+		break;
+	case LP8725_ID_BUCK1:
+		addr = LP8725_BUCK_CTRL;
+		mask = LP8725_BUCK1_FPWM_M;
+		break;
+	case LP8725_ID_BUCK2:
+		addr = LP8725_BUCK_CTRL;
+		mask = LP8725_BUCK2_FPWM_M;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = lp872x_read_byte(lp, addr, &val);
+	if (ret)
+		return ret;
+
+	return val & mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static struct regulator_ops lp872x_ldo_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable_time = lp872x_regulator_enable_time,
+};
+
+static struct regulator_ops lp8720_buck_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = lp872x_buck_set_voltage_sel,
+	.get_voltage_sel = lp872x_buck_get_voltage_sel,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable_time = lp872x_regulator_enable_time,
+	.set_mode = lp872x_buck_set_mode,
+	.get_mode = lp872x_buck_get_mode,
+};
+
+static struct regulator_ops lp8725_buck_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.set_voltage_sel = lp872x_buck_set_voltage_sel,
+	.get_voltage_sel = lp872x_buck_get_voltage_sel,
+	.enable = regulator_enable_regmap,
+	.disable = regulator_disable_regmap,
+	.is_enabled = regulator_is_enabled_regmap,
+	.enable_time = lp872x_regulator_enable_time,
+	.set_mode = lp872x_buck_set_mode,
+	.get_mode = lp872x_buck_get_mode,
+	.set_current_limit = lp8725_buck_set_current_limit,
+	.get_current_limit = lp8725_buck_get_current_limit,
+};
+
+static struct regulator_desc lp8720_regulator_desc[] = {
+	{
+		.name = "ldo1",
+		.id = LP8720_ID_LDO1,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO1_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8720_ENABLE,
+		.enable_mask = LP872X_EN_LDO1_M,
+	},
+	{
+		.name = "ldo2",
+		.id = LP8720_ID_LDO2,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO2_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8720_ENABLE,
+		.enable_mask = LP872X_EN_LDO2_M,
+	},
+	{
+		.name = "ldo3",
+		.id = LP8720_ID_LDO3,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO3_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8720_ENABLE,
+		.enable_mask = LP872X_EN_LDO3_M,
+	},
+	{
+		.name = "ldo4",
+		.id = LP8720_ID_LDO4,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp8720_ldo4_vtbl),
+		.volt_table = lp8720_ldo4_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO4_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8720_ENABLE,
+		.enable_mask = LP872X_EN_LDO4_M,
+	},
+	{
+		.name = "ldo5",
+		.id = LP8720_ID_LDO5,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO5_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8720_ENABLE,
+		.enable_mask = LP872X_EN_LDO5_M,
+	},
+	{
+		.name = "buck",
+		.id = LP8720_ID_BUCK,
+		.ops = &lp8720_buck_ops,
+		.n_voltages = ARRAY_SIZE(lp8720_buck_vtbl),
+		.volt_table = lp8720_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.enable_reg = LP8720_ENABLE,
+		.enable_mask = LP8720_EN_BUCK_M,
+	},
+};
+
+static struct regulator_desc lp8725_regulator_desc[] = {
+	{
+		.name = "ldo1",
+		.id = LP8725_ID_LDO1,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO1_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP872X_EN_LDO1_M,
+	},
+	{
+		.name = "ldo2",
+		.id = LP8725_ID_LDO2,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO2_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP872X_EN_LDO2_M,
+	},
+	{
+		.name = "ldo3",
+		.id = LP8725_ID_LDO3,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO3_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP872X_EN_LDO3_M,
+	},
+	{
+		.name = "ldo4",
+		.id = LP8725_ID_LDO4,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO4_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP872X_EN_LDO4_M,
+	},
+	{
+		.name = "ldo5",
+		.id = LP8725_ID_LDO5,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
+		.volt_table = lp872x_ldo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP872X_LDO5_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP872X_EN_LDO5_M,
+	},
+	{
+		.name = "lilo1",
+		.id = LP8725_ID_LILO1,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
+		.volt_table = lp8725_lilo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP8725_LILO1_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP8725_EN_LILO1_M,
+	},
+	{
+		.name = "lilo2",
+		.id = LP8725_ID_LILO2,
+		.ops = &lp872x_ldo_ops,
+		.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
+		.volt_table = lp8725_lilo_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.vsel_reg = LP8725_LILO2_VOUT,
+		.vsel_mask = LP872X_VOUT_M,
+		.enable_reg = LP8725_LDO_CTRL,
+		.enable_mask = LP8725_EN_LILO2_M,
+	},
+	{
+		.name = "buck1",
+		.id = LP8725_ID_BUCK1,
+		.ops = &lp8725_buck_ops,
+		.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
+		.volt_table = lp8725_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.enable_reg = LP872X_GENERAL_CFG,
+		.enable_mask = LP8725_BUCK1_EN_M,
+	},
+	{
+		.name = "buck2",
+		.id = LP8725_ID_BUCK2,
+		.ops = &lp8725_buck_ops,
+		.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
+		.volt_table = lp8725_buck_vtbl,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.enable_reg = LP872X_GENERAL_CFG,
+		.enable_mask = LP8725_BUCK2_EN_M,
+	},
+};
+
+static int lp872x_check_dvs_validity(struct lp872x *lp)
+{
+	struct lp872x_dvs *dvs = lp->pdata->dvs;
+	u8 val = 0;
+	int ret;
+
+	ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
+	if (ret)
+		return ret;
+
+	ret = 0;
+	if (lp->chipid == LP8720) {
+		if (val & LP8720_EXT_DVS_M)
+			ret = dvs ? 0 : -EINVAL;
+	} else {
+		if ((val & LP8725_DVS1_M) == EXTERN_DVS_USED)
+			ret = dvs ? 0 : -EINVAL;
+	}
+
+	return ret;
+}
+
+static int lp872x_init_dvs(struct lp872x *lp)
+{
+	int ret, gpio;
+	struct lp872x_dvs *dvs = lp->pdata->dvs;
+	enum lp872x_dvs_state pinstate;
+
+	ret = lp872x_check_dvs_validity(lp);
+	if (ret) {
+		dev_warn(lp->dev, "invalid dvs data: %d\n", ret);
+		return ret;
+	}
+
+	gpio = dvs->gpio;
+	if (!gpio_is_valid(gpio)) {
+		dev_err(lp->dev, "invalid gpio: %d\n", gpio);
+		return -EINVAL;
+	}
+
+	pinstate = dvs->init_state;
+	ret = devm_gpio_request_one(lp->dev, gpio, pinstate, "LP872X DVS");
+	if (ret) {
+		dev_err(lp->dev, "gpio request err: %d\n", ret);
+		return ret;
+	}
+
+	lp->dvs_pin = pinstate;
+	lp->dvs_gpio = gpio;
+
+	return 0;
+}
+
+static int lp872x_config(struct lp872x *lp)
+{
+	struct lp872x_platform_data *pdata = lp->pdata;
+	int ret;
+
+	if (!pdata) {
+		dev_warn(lp->dev, "no platform data\n");
+		return 0;
+	}
+
+	if (!pdata->update_config)
+		return 0;
+
+	ret = lp872x_write_byte(lp, LP872X_GENERAL_CFG, pdata->general_config);
+	if (ret)
+		return ret;
+
+	return lp872x_init_dvs(lp);
+}
+
+static struct regulator_init_data
+*lp872x_find_regulator_init_data(int idx, struct lp872x *lp)
+{
+	int i, base, id, max_regulators;
+
+	switch (lp->chipid) {
+	case LP8720:
+		base = LP8720_ID_BASE;
+		max_regulators = LP8720_NUM_REGULATORS;
+		break;
+	case LP8725:
+		base = LP8725_ID_BASE;
+		max_regulators = LP8725_NUM_REGULATORS;
+		break;
+	default:
+		return NULL;
+	}
+
+	id = base + idx;
+	for (i = 0 ; i < max_regulators ; i++)
+		if (lp->pdata->regulator_data[i].id == id)
+			break;
+
+	return (i == max_regulators) ? NULL :
+			lp->pdata->regulator_data[i].init_data;
+}
+
+static int lp872x_regulator_register(struct lp872x *lp)
+{
+	struct regulator_desc *desc;
+	struct regulator_config cfg = { };
+	struct regulator_dev *rdev;
+	int i, ret;
+
+	for (i = 0 ; i < lp->num_regulators ; i++) {
+		desc = (lp->chipid == LP8720) ? &lp8720_regulator_desc[i] :
+						&lp8725_regulator_desc[i];
+
+		cfg.dev = lp->dev;
+		cfg.init_data = lp872x_find_regulator_init_data(i, lp);
+		cfg.driver_data = lp;
+		cfg.regmap = lp->regmap;
+
+		rdev = regulator_register(desc, &cfg);
+		if (IS_ERR(rdev)) {
+			dev_err(lp->dev, "regulator register err");
+			ret =  PTR_ERR(rdev);
+			goto err;
+		}
+
+		*(lp->regulators + i) = rdev;
+	}
+
+	return 0;
+err:
+	while (--i >= 0) {
+		rdev = *(lp->regulators + i);
+		regulator_unregister(rdev);
+	}
+	return ret;
+}
+
+static void lp872x_regulator_unregister(struct lp872x *lp)
+{
+	struct regulator_dev *rdev;
+	int i;
+
+	for (i = 0 ; i < lp->num_regulators ; i++) {
+		rdev = *(lp->regulators + i);
+		regulator_unregister(rdev);
+	}
+}
+
+static const struct regmap_config lp872x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = MAX_REGISTERS,
+};
+
+static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
+{
+	struct lp872x *lp;
+	struct lp872x_platform_data *pdata = cl->dev.platform_data;
+	int ret, size, num_regulators;
+	const int lp872x_num_regulators[] = {
+		[LP8720] = LP8720_NUM_REGULATORS,
+		[LP8725] = LP8725_NUM_REGULATORS,
+	};
+
+	lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
+	if (!lp)
+		goto err_mem;
+
+	num_regulators = lp872x_num_regulators[id->driver_data];
+	size = sizeof(struct regulator_dev *) * num_regulators;
+
+	lp->regulators = devm_kzalloc(&cl->dev, size, GFP_KERNEL);
+	if (!lp->regulators)
+		goto err_mem;
+
+	lp->regmap = devm_regmap_init_i2c(cl, &lp872x_regmap_config);
+	if (IS_ERR(lp->regmap)) {
+		ret = PTR_ERR(lp->regmap);
+		dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
+		goto err_dev;
+	}
+
+	lp->dev = &cl->dev;
+	lp->pdata = pdata;
+	lp->chipid = id->driver_data;
+	lp->num_regulators = num_regulators;
+	i2c_set_clientdata(cl, lp);
+
+	ret = lp872x_config(lp);
+	if (ret)
+		goto err_dev;
+
+	return lp872x_regulator_register(lp);
+
+err_mem:
+	return -ENOMEM;
+err_dev:
+	return ret;
+}
+
+static int __devexit lp872x_remove(struct i2c_client *cl)
+{
+	struct lp872x *lp = i2c_get_clientdata(cl);
+
+	lp872x_regulator_unregister(lp);
+	return 0;
+}
+
+static const struct i2c_device_id lp872x_ids[] = {
+	{"lp8720", LP8720},
+	{"lp8725", LP8725},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp872x_ids);
+
+static struct i2c_driver lp872x_driver = {
+	.driver = {
+		.name = "lp872x",
+		.owner = THIS_MODULE,
+	},
+	.probe = lp872x_probe,
+	.remove = __devexit_p(lp872x_remove),
+	.id_table = lp872x_ids,
+};
+
+module_i2c_driver(lp872x_driver);
+
+MODULE_DESCRIPTION("TI/National Semiconductor LP872x PMU Regulator Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");

include/linux/regulator/lp872x.h

···
+/*
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <[e-mail]>
+ *
+ * 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.
+ *
+ */
+
+#ifndef __LP872X_REGULATOR_H__
+#define __LP872X_REGULATOR_H__
+
+#include <linux/regulator/machine.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#define LP872X_MAX_REGULATORS		9
+
+enum lp872x_regulator_id {
+	LP8720_ID_BASE,
+	LP8720_ID_LDO1 = LP8720_ID_BASE,
+	LP8720_ID_LDO2,
+	LP8720_ID_LDO3,
+	LP8720_ID_LDO4,
+	LP8720_ID_LDO5,
+	LP8720_ID_BUCK,
+
+	LP8725_ID_BASE,
+	LP8725_ID_LDO1 = LP8725_ID_BASE,
+	LP8725_ID_LDO2,
+	LP8725_ID_LDO3,
+	LP8725_ID_LDO4,
+	LP8725_ID_LDO5,
+	LP8725_ID_LILO1,
+	LP8725_ID_LILO2,
+	LP8725_ID_BUCK1,
+	LP8725_ID_BUCK2,
+
+	LP872X_ID_MAX,
+};
+
+enum lp872x_dvs_state {
+	DVS_LOW  = GPIOF_OUT_INIT_LOW,
+	DVS_HIGH = GPIOF_OUT_INIT_HIGH,
+};
+
+enum lp872x_dvs_sel {
+	SEL_V1,
+	SEL_V2,
+};
+
+/**
+ * lp872x_dvs
+ * @gpio       : gpio pin number for dvs control
+ * @vsel       : dvs selector for buck v1 or buck v2 register
+ * @init_state : initial dvs pin state
+ */
+struct lp872x_dvs {
+	int gpio;
+	enum lp872x_dvs_sel vsel;
+	enum lp872x_dvs_state init_state;
+};
+
+/**
+ * lp872x_regdata
+ * @id        : regulator id
+ * @init_data : init data for each regulator
+ */
+struct lp872x_regulator_data {
+	enum lp872x_regulator_id id;
+	struct regulator_init_data *init_data;
+};
+
+/**
+ * lp872x_platform_data
+ * @general_config    : the value of LP872X_GENERAL_CFG register
+ * @update_config     : if LP872X_GENERAL_CFG register is updated, set true
+ * @regulator_data    : platform regulator id and init data
+ * @dvs               : dvs data for buck voltage control
+ */
+struct lp872x_platform_data {
+	u8 general_config;
+	bool update_config;
+	struct lp872x_regulator_data regulator_data[LP872X_MAX_REGULATORS];
+	struct lp872x_dvs *dvs;
+};
+
+#endif