lp872x.c 25.8 KB
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/*
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * 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>
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#include <linux/delay.h>
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#include <linux/regulator/lp872x.h>
#include <linux/regulator/driver.h>
#include <linux/platform_device.h>
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#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/regulator/of_regulator.h>
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/* 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

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/* Default DVS Mode */
#define LP8720_DEFAULT_DVS		0
#define LP8725_DEFAULT_DVS		BIT(2)

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/* 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;
	int num_regulators;
	enum lp872x_dvs_state dvs_pin;
};

/* 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 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)
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		return ret;
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	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);
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	enum lp872x_regulator_id rid = rdev_get_id(rdev);
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	int time_step_us = lp872x_get_timestep_usec(lp);
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	int ret;
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	u8 addr, val;

	if (time_step_us < 0)
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		return time_step_us;
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	switch (rid) {
	case LP8720_ID_LDO1 ... LP8720_ID_BUCK:
		addr = LP872X_LDO1_VOUT + rid;
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		break;
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	case LP8725_ID_LDO1 ... LP8725_ID_BUCK1:
		addr = LP872X_LDO1_VOUT + rid - LP8725_ID_BASE;
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		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;
}

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static void lp872x_set_dvs(struct lp872x *lp, enum lp872x_dvs_sel dvs_sel,
			int gpio)
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{
	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;
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	struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
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	if (dvs && gpio_is_valid(dvs->gpio))
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		lp872x_set_dvs(lp, dvs->vsel, dvs->gpio);
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	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);
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	int i;
	u8 addr;
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	switch (buck) {
	case LP8725_ID_BUCK1:
		addr = LP8725_BUCK1_VOUT2;
		break;
	case LP8725_ID_BUCK2:
		addr = LP8725_BUCK2_VOUT2;
		break;
	default:
		return -EINVAL;
	}

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	for (i = ARRAY_SIZE(lp8725_buck_uA) - 1; i >= 0; i--) {
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		if (lp8725_buck_uA[i] >= min_uA &&
			lp8725_buck_uA[i] <= max_uA)
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			return lp872x_update_bits(lp, addr,
						  LP8725_BUCK_CL_M,
						  i << LP8725_BUCK_CL_S);
	}
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	return -EINVAL;
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}

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,
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	.map_voltage = regulator_map_voltage_ascend,
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	.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,
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	.map_voltage = regulator_map_voltage_ascend,
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	.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,
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	.map_voltage = regulator_map_voltage_ascend,
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	.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",
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		.of_match = of_match_ptr("ldo1"),
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		.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",
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		.of_match = of_match_ptr("ldo2"),
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		.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",
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		.of_match = of_match_ptr("ldo3"),
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		.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",
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		.of_match = of_match_ptr("ldo4"),
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		.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",
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		.of_match = of_match_ptr("ldo5"),
580 581 582 583 584 585 586 587 588 589 590 591 592
		.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",
593
		.of_match = of_match_ptr("buck"),
594 595 596 597 598 599 600 601 602 603 604 605 606 607
		.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",
608
		.of_match = of_match_ptr("ldo1"),
609 610 611 612 613 614 615 616 617 618 619 620 621
		.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",
622
		.of_match = of_match_ptr("ldo2"),
623 624 625 626 627 628 629 630 631 632 633 634 635
		.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",
636
		.of_match = of_match_ptr("ldo3"),
637 638 639 640 641 642 643 644 645 646 647 648 649
		.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",
650
		.of_match = of_match_ptr("ldo4"),
651 652 653 654 655 656 657 658 659 660 661 662 663
		.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",
664
		.of_match = of_match_ptr("ldo5"),
665 666 667 668 669 670 671 672 673 674 675 676 677
		.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",
678
		.of_match = of_match_ptr("lilo1"),
679 680 681 682 683 684 685 686 687 688 689 690 691
		.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",
692
		.of_match = of_match_ptr("lilo2"),
693 694 695 696 697 698 699 700 701 702 703 704 705
		.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",
706
		.of_match = of_match_ptr("buck1"),
707 708 709 710 711 712 713 714 715 716 717
		.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",
718
		.of_match = of_match_ptr("buck2"),
719 720 721 722 723 724 725 726 727 728 729 730 731 732
		.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_init_dvs(struct lp872x *lp)
{
	int ret, gpio;
733
	struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
734
	enum lp872x_dvs_state pinstate;
735 736 737 738 739
	u8 mask[] = { LP8720_EXT_DVS_M, LP8725_DVS1_M | LP8725_DVS2_M };
	u8 default_dvs_mode[] = { LP8720_DEFAULT_DVS, LP8725_DEFAULT_DVS };

	if (!dvs)
		goto set_default_dvs_mode;
740 741

	gpio = dvs->gpio;
742
	if (!gpio_is_valid(gpio))
743
		goto set_default_dvs_mode;
744 745 746 747 748 749 750 751 752 753 754

	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;

	return 0;
755 756 757 758

set_default_dvs_mode:
	return lp872x_update_bits(lp, LP872X_GENERAL_CFG, mask[lp->chipid],
				default_dvs_mode[lp->chipid]);
759 760
}

761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
static int lp872x_hw_enable(struct lp872x *lp)
{
	int ret, gpio;

	if (!lp->pdata)
		return -EINVAL;

	gpio = lp->pdata->enable_gpio;
	if (!gpio_is_valid(gpio))
		return 0;

	/* Always set enable GPIO high. */
	ret = devm_gpio_request_one(lp->dev, gpio, GPIOF_OUT_INIT_HIGH, "LP872X EN");
	if (ret) {
		dev_err(lp->dev, "gpio request err: %d\n", ret);
		return ret;
	}

	/* Each chip has a different enable delay. */
	if (lp->chipid == LP8720)
		usleep_range(LP8720_ENABLE_DELAY, 1.5 * LP8720_ENABLE_DELAY);
	else
		usleep_range(LP8725_ENABLE_DELAY, 1.5 * LP8725_ENABLE_DELAY);

	return 0;
}

788 789 790 791 792
static int lp872x_config(struct lp872x *lp)
{
	struct lp872x_platform_data *pdata = lp->pdata;
	int ret;

793 794
	if (!pdata || !pdata->update_config)
		goto init_dvs;
795 796 797 798 799

	ret = lp872x_write_byte(lp, LP872X_GENERAL_CFG, pdata->general_config);
	if (ret)
		return ret;

800
init_dvs:
801 802 803 804
	return lp872x_init_dvs(lp);
}

static struct regulator_init_data
805
*lp872x_find_regulator_init_data(int id, struct lp872x *lp)
806
{
807
	struct lp872x_platform_data *pdata = lp->pdata;
808
	int i;
809

810 811 812
	if (!pdata)
		return NULL;

813
	for (i = 0; i < lp->num_regulators; i++) {
814 815
		if (pdata->regulator_data[i].id == id)
			return pdata->regulator_data[i].init_data;
816
	}
817

818
	return NULL;
819 820 821 822 823 824 825
}

static int lp872x_regulator_register(struct lp872x *lp)
{
	struct regulator_desc *desc;
	struct regulator_config cfg = { };
	struct regulator_dev *rdev;
826
	int i;
827

828
	for (i = 0; i < lp->num_regulators; i++) {
829 830 831 832
		desc = (lp->chipid == LP8720) ? &lp8720_regulator_desc[i] :
						&lp8725_regulator_desc[i];

		cfg.dev = lp->dev;
833
		cfg.init_data = lp872x_find_regulator_init_data(desc->id, lp);
834 835 836
		cfg.driver_data = lp;
		cfg.regmap = lp->regmap;

837
		rdev = devm_regulator_register(lp->dev, desc, &cfg);
838 839
		if (IS_ERR(rdev)) {
			dev_err(lp->dev, "regulator register err");
840
			return PTR_ERR(rdev);
841 842 843 844 845 846 847 848 849 850 851 852
		}
	}

	return 0;
}

static const struct regmap_config lp872x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX_REGISTERS,
};

853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
#ifdef CONFIG_OF

#define LP872X_VALID_OPMODE	(REGULATOR_MODE_FAST | REGULATOR_MODE_NORMAL)

static struct of_regulator_match lp8720_matches[] = {
	{ .name = "ldo1", .driver_data = (void *)LP8720_ID_LDO1, },
	{ .name = "ldo2", .driver_data = (void *)LP8720_ID_LDO2, },
	{ .name = "ldo3", .driver_data = (void *)LP8720_ID_LDO3, },
	{ .name = "ldo4", .driver_data = (void *)LP8720_ID_LDO4, },
	{ .name = "ldo5", .driver_data = (void *)LP8720_ID_LDO5, },
	{ .name = "buck", .driver_data = (void *)LP8720_ID_BUCK, },
};

static struct of_regulator_match lp8725_matches[] = {
	{ .name = "ldo1", .driver_data = (void *)LP8725_ID_LDO1, },
	{ .name = "ldo2", .driver_data = (void *)LP8725_ID_LDO2, },
	{ .name = "ldo3", .driver_data = (void *)LP8725_ID_LDO3, },
	{ .name = "ldo4", .driver_data = (void *)LP8725_ID_LDO4, },
	{ .name = "ldo5", .driver_data = (void *)LP8725_ID_LDO5, },
	{ .name = "lilo1", .driver_data = (void *)LP8725_ID_LILO1, },
	{ .name = "lilo2", .driver_data = (void *)LP8725_ID_LILO2, },
	{ .name = "buck1", .driver_data = (void *)LP8725_ID_BUCK1, },
	{ .name = "buck2", .driver_data = (void *)LP8725_ID_BUCK2, },
};

static struct lp872x_platform_data
*lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
{
	struct device_node *np = dev->of_node;
	struct lp872x_platform_data *pdata;
	struct of_regulator_match *match;
	int num_matches;
	int count;
	int i;
	u8 dvs_state;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
891
		return ERR_PTR(-ENOMEM);
892 893 894 895 896 897 898

	of_property_read_u8(np, "ti,general-config", &pdata->general_config);
	if (of_find_property(np, "ti,update-config", NULL))
		pdata->update_config = true;

	pdata->dvs = devm_kzalloc(dev, sizeof(struct lp872x_dvs), GFP_KERNEL);
	if (!pdata->dvs)
899
		return ERR_PTR(-ENOMEM);
900 901 902 903 904 905

	pdata->dvs->gpio = of_get_named_gpio(np, "ti,dvs-gpio", 0);
	of_property_read_u8(np, "ti,dvs-vsel", (u8 *)&pdata->dvs->vsel);
	of_property_read_u8(np, "ti,dvs-state", &dvs_state);
	pdata->dvs->init_state = dvs_state ? DVS_HIGH : DVS_LOW;

906 907
	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpios", 0);

908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
	if (of_get_child_count(np) == 0)
		goto out;

	switch (which) {
	case LP8720:
		match = lp8720_matches;
		num_matches = ARRAY_SIZE(lp8720_matches);
		break;
	case LP8725:
		match = lp8725_matches;
		num_matches = ARRAY_SIZE(lp8725_matches);
		break;
	default:
		goto out;
	}

	count = of_regulator_match(dev, np, match, num_matches);
	if (count <= 0)
		goto out;

	for (i = 0; i < num_matches; i++) {
929 930
		pdata->regulator_data[i].id =
				(enum lp872x_regulator_id)match[i].driver_data;
931 932 933 934 935 936 937 938 939 940 941 942 943
		pdata->regulator_data[i].init_data = match[i].init_data;
	}
out:
	return pdata;
}
#else
static struct lp872x_platform_data
*lp872x_populate_pdata_from_dt(struct device *dev, enum lp872x_id which)
{
	return NULL;
}
#endif

944 945 946
static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
	struct lp872x *lp;
947
	struct lp872x_platform_data *pdata;
948
	int ret;
949 950 951 952 953
	const int lp872x_num_regulators[] = {
		[LP8720] = LP8720_NUM_REGULATORS,
		[LP8725] = LP8725_NUM_REGULATORS,
	};

954
	if (cl->dev.of_node) {
955
		pdata = lp872x_populate_pdata_from_dt(&cl->dev,
956
					      (enum lp872x_id)id->driver_data);
957 958 959
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	} else {
960
		pdata = dev_get_platdata(&cl->dev);
961
	}
962

963 964
	lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
	if (!lp)
965
		return -ENOMEM;
966

967
	lp->num_regulators = lp872x_num_regulators[id->driver_data];
968 969 970 971 972

	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);
973
		return ret;
974 975 976
	}

	lp->dev = &cl->dev;
977
	lp->pdata = pdata;
978 979 980
	lp->chipid = id->driver_data;
	i2c_set_clientdata(cl, lp);

981 982 983 984
	ret = lp872x_hw_enable(lp);
	if (ret)
		return ret;

985 986
	ret = lp872x_config(lp);
	if (ret)
987
		return ret;
988 989 990 991

	return lp872x_regulator_register(lp);
}

992 993 994 995 996 997 998
static const struct of_device_id lp872x_dt_ids[] = {
	{ .compatible = "ti,lp8720", },
	{ .compatible = "ti,lp8725", },
	{ }
};
MODULE_DEVICE_TABLE(of, lp872x_dt_ids);

999 1000 1001 1002 1003 1004 1005 1006 1007 1008
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",
1009
		.of_match_table = of_match_ptr(lp872x_dt_ids),
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019
	},
	.probe = lp872x_probe,
	.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");