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// SPDX-License-Identifier: GPL-2.0+
//
// mp5416.c - regulator driver for mps mp5416
//
// Copyright 2020 Monolithic Power Systems, Inc
//
// Author: Saravanan Sekar <sravanhome@gmail.com>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/i2c.h>
#define MP5416_REG_CTL0 0x00
#define MP5416_REG_CTL1 0x01
#define MP5416_REG_CTL2 0x02
#define MP5416_REG_ILIM 0x03
#define MP5416_REG_BUCK1 0x04
#define MP5416_REG_BUCK2 0x05
#define MP5416_REG_BUCK3 0x06
#define MP5416_REG_BUCK4 0x07
#define MP5416_REG_LDO1 0x08
#define MP5416_REG_LDO2 0x09
#define MP5416_REG_LDO3 0x0a
#define MP5416_REG_LDO4 0x0b
#define MP5416_REGULATOR_EN BIT(7)
#define MP5416_MASK_VSET 0x7f
#define MP5416_MASK_BUCK1_ILIM 0xc0
#define MP5416_MASK_BUCK2_ILIM 0x0c
#define MP5416_MASK_BUCK3_ILIM 0x30
#define MP5416_MASK_BUCK4_ILIM 0x03
#define MP5416_MASK_DVS_SLEWRATE 0xc0
/* values in uV */
#define MP5416_VOLT1_MIN 600000
#define MP5416_VOLT1_MAX 2187500
#define MP5416_VOLT1_STEP 12500
#define MP5416_VOLT2_MIN 800000
#define MP5416_VOLT2_MAX 3975000
#define MP5416_VOLT2_STEP 25000
#define MP5416_VOLT1_RANGE \
((MP5416_VOLT1_MAX - MP5416_VOLT1_MIN)/MP5416_VOLT1_STEP + 1)
#define MP5416_VOLT2_RANGE \
((MP5416_VOLT2_MAX - MP5416_VOLT2_MIN)/MP5416_VOLT2_STEP + 1)
#define MP5416BUCK(_name, _id, _ilim, _dreg, _dval, _vsel) \
[MP5416_BUCK ## _id] = { \
.id = MP5416_BUCK ## _id, \
.name = _name, \
.of_match = _name, \
.regulators_node = "regulators", \
.ops = &mp5416_buck_ops, \
.min_uV = MP5416_VOLT ##_vsel## _MIN, \
.uV_step = MP5416_VOLT ##_vsel## _STEP, \
.n_voltages = MP5416_VOLT ##_vsel## _RANGE, \
.curr_table = _ilim, \
.n_current_limits = ARRAY_SIZE(_ilim), \
.csel_reg = MP5416_REG_ILIM, \
.csel_mask = MP5416_MASK_BUCK ## _id ##_ILIM, \
.vsel_reg = MP5416_REG_BUCK ## _id, \
.vsel_mask = MP5416_MASK_VSET, \
.enable_reg = MP5416_REG_BUCK ## _id, \
.enable_mask = MP5416_REGULATOR_EN, \
.active_discharge_on = _dval, \
.active_discharge_reg = _dreg, \
.active_discharge_mask = _dval, \
.owner = THIS_MODULE, \
}
#define MP5416LDO(_name, _id, _dval) \
[MP5416_LDO ## _id] = { \
.id = MP5416_LDO ## _id, \
.name = _name, \
.of_match = _name, \
.regulators_node = "regulators", \
.ops = &mp5416_ldo_ops, \
.min_uV = MP5416_VOLT2_MIN, \
.uV_step = MP5416_VOLT2_STEP, \
.n_voltages = MP5416_VOLT2_RANGE, \
.vsel_reg = MP5416_REG_LDO ##_id, \
.vsel_mask = MP5416_MASK_VSET, \
.enable_reg = MP5416_REG_LDO ##_id, \
.enable_mask = MP5416_REGULATOR_EN, \
.active_discharge_on = _dval, \
.active_discharge_reg = MP5416_REG_CTL2, \
.active_discharge_mask = _dval, \
.owner = THIS_MODULE, \
}
enum mp5416_regulators {
MP5416_BUCK1,
MP5416_BUCK2,
MP5416_BUCK3,
MP5416_BUCK4,
MP5416_LDO1,
MP5416_LDO2,
MP5416_LDO3,
MP5416_LDO4,
MP5416_MAX_REGULATORS,
};
static const struct regmap_config mp5416_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x0d,
};
/* Current limits array (in uA)
* ILIM1 & ILIM3
*/
static const unsigned int mp5416_I_limits1[] = {
3800000, 4600000, 5600000, 6800000
};
/* ILIM2 & ILIM4 */
static const unsigned int mp5416_I_limits2[] = {
2200000, 3200000, 4200000, 5200000
};
static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
static const struct regulator_ops mp5416_ldo_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
};
static const struct regulator_ops mp5416_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_current_limit = regulator_get_current_limit_regmap,
.set_current_limit = regulator_set_current_limit_regmap,
.set_ramp_delay = mp5416_set_ramp_delay,
};
static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
MP5416LDO("ldo1", 1, BIT(4)),
MP5416LDO("ldo2", 2, BIT(3)),
MP5416LDO("ldo3", 3, BIT(2)),
MP5416LDO("ldo4", 4, BIT(1)),
};
/*
* DVS ramp rate BUCK1 to BUCK4
* 00: 32mV/us
* 01: 16mV/us
* 10: 8mV/us
* 11: 4mV/us
*/
static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
unsigned int ramp_val;
if (ramp_delay > 32000 || ramp_delay < 0)
return -EINVAL;
if (ramp_delay <= 4000)
ramp_val = 3;
else if (ramp_delay <= 8000)
ramp_val = 2;
else if (ramp_delay <= 16000)
ramp_val = 1;
else
ramp_val = 0;
return regmap_update_bits(rdev->regmap, MP5416_REG_CTL2,
MP5416_MASK_DVS_SLEWRATE, ramp_val << 6);
}
static int mp5416_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct regulator_config config = { NULL, };
struct regulator_dev *rdev;
struct regmap *regmap;
int i;
regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
config.dev = dev;
config.regmap = regmap;
for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
rdev = devm_regulator_register(dev,
&mp5416_regulators_desc[i],
&config);
if (IS_ERR(rdev)) {
dev_err(dev, "Failed to register regulator!\n");
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct of_device_id mp5416_of_match[] = {
{ .compatible = "mps,mp5416" },
{},
};
MODULE_DEVICE_TABLE(of, mp5416_of_match);
static const struct i2c_device_id mp5416_id[] = {
{ "mp5416", },
{ },
};
MODULE_DEVICE_TABLE(i2c, mp5416_id);
static struct i2c_driver mp5416_regulator_driver = {
.driver = {
.name = "mp5416",
.of_match_table = of_match_ptr(mp5416_of_match),
},
.probe_new = mp5416_i2c_probe,
.id_table = mp5416_id,
};
module_i2c_driver(mp5416_regulator_driver);
MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
MODULE_LICENSE("GPL");
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