// SPDX-License-Identifier: GPL-2.0+
//
// mpq7920.c - regulator driver for mps mpq7920
//
// Copyright 2019 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/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include "mpq7920.h"
#define MPQ7920_BUCK_VOLT_RANGE \
((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
#define MPQ7920_LDO_VOLT_RANGE \
((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
#define MPQ7920BUCK(_name, _id, _ilim) \
[MPQ7920_BUCK ## _id] = { \
.id = MPQ7920_BUCK ## _id, \
.name = _name, \
.of_match = _name, \
.regulators_node = "regulators", \
.of_parse_cb = mpq7920_parse_cb, \
.ops = &mpq7920_buck_ops, \
.min_uV = MPQ7920_BUCK_VOLT_MIN, \
.uV_step = MPQ7920_VOLT_STEP, \
.n_voltages = MPQ7920_BUCK_VOLT_RANGE, \
.curr_table = _ilim, \
.n_current_limits = ARRAY_SIZE(_ilim), \
.csel_reg = MPQ7920_BUCK ##_id## _REG_C, \
.csel_mask = MPQ7920_MASK_BUCK_ILIM, \
.enable_reg = MPQ7920_REG_REGULATOR_EN, \
.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
MPQ7920_BUCK ## _id), \
.vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \
.vsel_mask = MPQ7920_MASK_VREF, \
.active_discharge_on = MPQ7920_DISCHARGE_ON, \
.active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \
.active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
.soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \
.soft_start_mask = MPQ7920_MASK_SOFTSTART, \
.owner = THIS_MODULE, \
}
#define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \
[MPQ7920_LDO ## _id] = { \
.id = MPQ7920_LDO ## _id, \
.name = _name, \
.of_match = _name, \
.regulators_node = "regulators", \
.ops = _ops, \
.min_uV = MPQ7920_LDO_VOLT_MIN, \
.uV_step = MPQ7920_VOLT_STEP, \
.n_voltages = MPQ7920_LDO_VOLT_RANGE, \
.vsel_reg = MPQ7920_LDO ##_id## _REG_A, \
.vsel_mask = MPQ7920_MASK_VREF, \
.curr_table = _ilim, \
.n_current_limits = _ilim_sz, \
.csel_reg = _creg, \
.csel_mask = _cmask, \
.enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\
.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
MPQ7920_LDO ##_id + 1), \
.active_discharge_on = MPQ7920_DISCHARGE_ON, \
.active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
.active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}
enum mpq7920_regulators {
MPQ7920_BUCK1,
MPQ7920_BUCK2,
MPQ7920_BUCK3,
MPQ7920_BUCK4,
MPQ7920_LDO1, /* LDORTC */
MPQ7920_LDO2,
MPQ7920_LDO3,
MPQ7920_LDO4,
MPQ7920_LDO5,
MPQ7920_MAX_REGULATORS,
};
struct mpq7920_regulator_info {
struct device *dev;
struct regmap *regmap;
struct regulator_dev *rdev[MPQ7920_MAX_REGULATORS];
struct regulator_desc *rdesc;
};
static const struct regmap_config mpq7920_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x25,
};
/* Current limits array (in uA)
* ILIM1 & ILIM3
*/
static const unsigned int mpq7920_I_limits1[] = {
4600000, 6600000, 7600000, 9300000
};
/* ILIM2 & ILIM4 */
static const unsigned int mpq7920_I_limits2[] = {
2700000, 3900000, 5100000, 6100000
};
/* LDO4 & LDO5 */
static const unsigned int mpq7920_I_limits3[] = {
300000, 700000
};
static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
static int mpq7920_parse_cb(struct device_node *np,
const struct regulator_desc *rdesc,
struct regulator_config *config);
/* RTCLDO not controllable, always ON */
static const struct regulator_ops mpq7920_ldortc_ops = {
.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,
};
static const struct regulator_ops mpq7920_ldo_wo_current_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 mpq7920_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,
.get_current_limit = regulator_get_current_limit_regmap,
.set_current_limit = regulator_set_current_limit_regmap,
};
static const struct regulator_ops mpq7920_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,
.set_soft_start = regulator_set_soft_start_regmap,
.set_ramp_delay = mpq7920_set_ramp_delay,
};
static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = {
MPQ7920BUCK("buck1", 1, mpq7920_I_limits1),
MPQ7920BUCK("buck2", 2, mpq7920_I_limits2),
MPQ7920BUCK("buck3", 3, mpq7920_I_limits1),
MPQ7920BUCK("buck4", 4, mpq7920_I_limits2),
MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0),
MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3,
ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B,
MPQ7920_MASK_LDO_ILIM),
MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3,
ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B,
MPQ7920_MASK_LDO_ILIM),
};
/*
* DVS ramp rate BUCK1 to BUCK4
* 00-01: Reserved
* 10: 8mV/us
* 11: 4mV/us
*/
static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
unsigned int ramp_val;
if (ramp_delay > 8000 || ramp_delay < 0)
return -EINVAL;
if (ramp_delay <= 4000)
ramp_val = 3;
else
ramp_val = 2;
return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0,
MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6);
}
static int mpq7920_parse_cb(struct device_node *np,
const struct regulator_desc *desc,
struct regulator_config *config)
{
uint8_t val;
int ret;
struct mpq7920_regulator_info *info = config->driver_data;
struct regulator_desc *rdesc = &info->rdesc[desc->id];
if (of_property_read_bool(np, "mps,buck-ovp-disable")) {
regmap_update_bits(config->regmap,
MPQ7920_BUCK1_REG_B + (rdesc->id * 4),
MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE);
}
ret = of_property_read_u8(np, "mps,buck-phase-delay", &val);
if (!ret) {
regmap_update_bits(config->regmap,
MPQ7920_BUCK1_REG_C + (rdesc->id * 4),
MPQ7920_MASK_BUCK_PHASE_DEALY,
(val & 3) << 4);
}
ret = of_property_read_u8(np, "mps,buck-softstart", &val);
if (!ret)
rdesc->soft_start_val_on = (val & 3) << 2;
return 0;
}
static void mpq7920_parse_dt(struct device *dev,
struct mpq7920_regulator_info *info)
{
int ret;
struct device_node *np = dev->of_node;
uint8_t freq;
np = of_get_child_by_name(np, "regulators");
if (!np) {
dev_err(dev, "missing 'regulators' subnode in DT\n");
return;
}
ret = of_property_read_u8(np, "mps,switch-freq", &freq);
if (!ret) {
regmap_update_bits(info->regmap, MPQ7920_REG_CTL0,
MPQ7920_MASK_SWITCH_FREQ,
(freq & 3) << 4);
}
of_node_put(np);
}
static inline int mpq7920_regulator_register(
struct mpq7920_regulator_info *info,
struct regulator_config *config)
{
int i;
struct regulator_desc *rdesc;
for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) {
rdesc = &info->rdesc[i];
info->rdev[i] = devm_regulator_register(info->dev, rdesc,
config);
if (IS_ERR(info->rdev))
return PTR_ERR(info->rdev);
}
return 0;
}
static int mpq7920_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct mpq7920_regulator_info *info;
struct regulator_config config = { NULL, };
struct regmap *regmap;
int ret;
info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = dev;
info->rdesc = mpq7920_regulators_desc;
regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
i2c_set_clientdata(client, info);
info->regmap = regmap;
if (client->dev.of_node)
mpq7920_parse_dt(&client->dev, info);
config.dev = info->dev;
config.regmap = regmap;
config.driver_data = info;
ret = mpq7920_regulator_register(info, &config);
if (ret < 0)
dev_err(dev, "Failed to register regulator!\n");
return ret;
}
static const struct of_device_id mpq7920_of_match[] = {
{ .compatible = "mps,mpq7920"},
{},
};
MODULE_DEVICE_TABLE(of, mpq7920_of_match);
static const struct i2c_device_id mpq7920_id[] = {
{ "mpq7920", },
{ },
};
MODULE_DEVICE_TABLE(i2c, mpq7920_id);
static struct i2c_driver mpq7920_regulator_driver = {
.driver = {
.name = "mpq7920",
.of_match_table = of_match_ptr(mpq7920_of_match),
},
.probe = mpq7920_i2c_probe,
.id_table = mpq7920_id,
};
module_i2c_driver(mpq7920_regulator_driver);
MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver");
MODULE_LICENSE("GPL");
