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1// SPDX-License-Identifier: GPL-2.0+2//3// mpq7920.c - regulator driver for mps mpq79204//5// Copyright 2019 Monolithic Power Systems, Inc6//7// Author: Saravanan Sekar <sravanhome@gmail.com>8 9#include <linux/kernel.h>10#include <linux/module.h>11#include <linux/init.h>12#include <linux/err.h>13#include <linux/of.h>14#include <linux/platform_device.h>15#include <linux/regulator/driver.h>16#include <linux/regulator/of_regulator.h>17#include <linux/i2c.h>18#include <linux/regmap.h>19#include "mpq7920.h"20 21#define MPQ7920_BUCK_VOLT_RANGE \22 ((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)23#define MPQ7920_LDO_VOLT_RANGE \24 ((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)25 26#define MPQ7920BUCK(_name, _id, _ilim) \27 [MPQ7920_BUCK ## _id] = { \28 .id = MPQ7920_BUCK ## _id, \29 .name = _name, \30 .of_match = _name, \31 .regulators_node = "regulators", \32 .of_parse_cb = mpq7920_parse_cb, \33 .ops = &mpq7920_buck_ops, \34 .min_uV = MPQ7920_BUCK_VOLT_MIN, \35 .uV_step = MPQ7920_VOLT_STEP, \36 .n_voltages = MPQ7920_BUCK_VOLT_RANGE, \37 .curr_table = _ilim, \38 .n_current_limits = ARRAY_SIZE(_ilim), \39 .csel_reg = MPQ7920_BUCK ##_id## _REG_C, \40 .csel_mask = MPQ7920_MASK_BUCK_ILIM, \41 .enable_reg = MPQ7920_REG_REGULATOR_EN, \42 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \43 MPQ7920_BUCK ## _id), \44 .vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \45 .vsel_mask = MPQ7920_MASK_VREF, \46 .active_discharge_on = MPQ7920_DISCHARGE_ON, \47 .active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \48 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \49 .soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \50 .soft_start_mask = MPQ7920_MASK_SOFTSTART, \51 .owner = THIS_MODULE, \52 }53 54#define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \55 [MPQ7920_LDO ## _id] = { \56 .id = MPQ7920_LDO ## _id, \57 .name = _name, \58 .of_match = _name, \59 .regulators_node = "regulators", \60 .ops = _ops, \61 .min_uV = MPQ7920_LDO_VOLT_MIN, \62 .uV_step = MPQ7920_VOLT_STEP, \63 .n_voltages = MPQ7920_LDO_VOLT_RANGE, \64 .vsel_reg = MPQ7920_LDO ##_id## _REG_A, \65 .vsel_mask = MPQ7920_MASK_VREF, \66 .curr_table = _ilim, \67 .n_current_limits = _ilim_sz, \68 .csel_reg = _creg, \69 .csel_mask = _cmask, \70 .enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\71 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \72 MPQ7920_LDO ##_id + 1), \73 .active_discharge_on = MPQ7920_DISCHARGE_ON, \74 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \75 .active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \76 .type = REGULATOR_VOLTAGE, \77 .owner = THIS_MODULE, \78 }79 80enum mpq7920_regulators {81 MPQ7920_BUCK1,82 MPQ7920_BUCK2,83 MPQ7920_BUCK3,84 MPQ7920_BUCK4,85 MPQ7920_LDO1, /* LDORTC */86 MPQ7920_LDO2,87 MPQ7920_LDO3,88 MPQ7920_LDO4,89 MPQ7920_LDO5,90 MPQ7920_MAX_REGULATORS,91};92 93struct mpq7920_regulator_info {94 struct regmap *regmap;95 struct regulator_desc *rdesc;96};97 98static const struct regmap_config mpq7920_regmap_config = {99 .reg_bits = 8,100 .val_bits = 8,101 .max_register = 0x25,102};103 104/* Current limits array (in uA)105 * ILIM1 & ILIM3106 */107static const unsigned int mpq7920_I_limits1[] = {108 4600000, 6600000, 7600000, 9300000109};110 111/* ILIM2 & ILIM4 */112static const unsigned int mpq7920_I_limits2[] = {113 2700000, 3900000, 5100000, 6100000114};115 116/* LDO4 & LDO5 */117static const unsigned int mpq7920_I_limits3[] = {118 300000, 700000119};120 121static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);122static int mpq7920_parse_cb(struct device_node *np,123 const struct regulator_desc *rdesc,124 struct regulator_config *config);125 126/* RTCLDO not controllable, always ON */127static const struct regulator_ops mpq7920_ldortc_ops = {128 .list_voltage = regulator_list_voltage_linear,129 .map_voltage = regulator_map_voltage_linear,130 .get_voltage_sel = regulator_get_voltage_sel_regmap,131 .set_voltage_sel = regulator_set_voltage_sel_regmap,132};133 134static const struct regulator_ops mpq7920_ldo_wo_current_ops = {135 .enable = regulator_enable_regmap,136 .disable = regulator_disable_regmap,137 .is_enabled = regulator_is_enabled_regmap,138 .list_voltage = regulator_list_voltage_linear,139 .map_voltage = regulator_map_voltage_linear,140 .get_voltage_sel = regulator_get_voltage_sel_regmap,141 .set_voltage_sel = regulator_set_voltage_sel_regmap,142 .set_active_discharge = regulator_set_active_discharge_regmap,143};144 145static const struct regulator_ops mpq7920_ldo_ops = {146 .enable = regulator_enable_regmap,147 .disable = regulator_disable_regmap,148 .is_enabled = regulator_is_enabled_regmap,149 .list_voltage = regulator_list_voltage_linear,150 .map_voltage = regulator_map_voltage_linear,151 .get_voltage_sel = regulator_get_voltage_sel_regmap,152 .set_voltage_sel = regulator_set_voltage_sel_regmap,153 .set_active_discharge = regulator_set_active_discharge_regmap,154 .get_current_limit = regulator_get_current_limit_regmap,155 .set_current_limit = regulator_set_current_limit_regmap,156};157 158static const struct regulator_ops mpq7920_buck_ops = {159 .enable = regulator_enable_regmap,160 .disable = regulator_disable_regmap,161 .is_enabled = regulator_is_enabled_regmap,162 .list_voltage = regulator_list_voltage_linear,163 .map_voltage = regulator_map_voltage_linear,164 .get_voltage_sel = regulator_get_voltage_sel_regmap,165 .set_voltage_sel = regulator_set_voltage_sel_regmap,166 .set_active_discharge = regulator_set_active_discharge_regmap,167 .set_soft_start = regulator_set_soft_start_regmap,168 .set_ramp_delay = mpq7920_set_ramp_delay,169};170 171static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = {172 MPQ7920BUCK("buck1", 1, mpq7920_I_limits1),173 MPQ7920BUCK("buck2", 2, mpq7920_I_limits2),174 MPQ7920BUCK("buck3", 3, mpq7920_I_limits1),175 MPQ7920BUCK("buck4", 4, mpq7920_I_limits2),176 MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0),177 MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),178 MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),179 MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3,180 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B,181 MPQ7920_MASK_LDO_ILIM),182 MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3,183 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B,184 MPQ7920_MASK_LDO_ILIM),185};186 187/*188 * DVS ramp rate BUCK1 to BUCK4189 * 00-01: Reserved190 * 10: 8mV/us191 * 11: 4mV/us192 */193static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)194{195 unsigned int ramp_val;196 197 if (ramp_delay > 8000 || ramp_delay < 0)198 return -EINVAL;199 200 if (ramp_delay <= 4000)201 ramp_val = 3;202 else203 ramp_val = 2;204 205 return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0,206 MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6);207}208 209static int mpq7920_parse_cb(struct device_node *np,210 const struct regulator_desc *desc,211 struct regulator_config *config)212{213 uint8_t val;214 int ret;215 struct mpq7920_regulator_info *info = config->driver_data;216 struct regulator_desc *rdesc = &info->rdesc[desc->id];217 218 if (of_property_read_bool(np, "mps,buck-ovp-disable")) {219 regmap_update_bits(config->regmap,220 MPQ7920_BUCK1_REG_B + (rdesc->id * 4),221 MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE);222 }223 224 ret = of_property_read_u8(np, "mps,buck-phase-delay", &val);225 if (!ret) {226 regmap_update_bits(config->regmap,227 MPQ7920_BUCK1_REG_C + (rdesc->id * 4),228 MPQ7920_MASK_BUCK_PHASE_DEALY,229 (val & 3) << 4);230 }231 232 ret = of_property_read_u8(np, "mps,buck-softstart", &val);233 if (!ret)234 rdesc->soft_start_val_on = (val & 3) << 2;235 236 return 0;237}238 239static void mpq7920_parse_dt(struct device *dev,240 struct mpq7920_regulator_info *info)241{242 int ret;243 struct device_node *np = dev->of_node;244 uint8_t freq;245 246 np = of_get_child_by_name(np, "regulators");247 if (!np) {248 dev_err(dev, "missing 'regulators' subnode in DT\n");249 return;250 }251 252 ret = of_property_read_u8(np, "mps,switch-freq", &freq);253 if (!ret) {254 regmap_update_bits(info->regmap, MPQ7920_REG_CTL0,255 MPQ7920_MASK_SWITCH_FREQ,256 (freq & 3) << 4);257 }258 259 of_node_put(np);260}261 262static int mpq7920_i2c_probe(struct i2c_client *client)263{264 struct device *dev = &client->dev;265 struct mpq7920_regulator_info *info;266 struct regulator_config config = { NULL, };267 struct regulator_dev *rdev;268 struct regmap *regmap;269 int i;270 271 info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info),272 GFP_KERNEL);273 if (!info)274 return -ENOMEM;275 276 info->rdesc = mpq7920_regulators_desc;277 regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config);278 if (IS_ERR(regmap)) {279 dev_err(dev, "Failed to allocate regmap!\n");280 return PTR_ERR(regmap);281 }282 283 i2c_set_clientdata(client, info);284 info->regmap = regmap;285 if (client->dev.of_node)286 mpq7920_parse_dt(&client->dev, info);287 288 config.dev = dev;289 config.regmap = regmap;290 config.driver_data = info;291 292 for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) {293 rdev = devm_regulator_register(dev,294 &mpq7920_regulators_desc[i],295 &config);296 if (IS_ERR(rdev)) {297 dev_err(dev, "Failed to register regulator!\n");298 return PTR_ERR(rdev);299 }300 }301 302 return 0;303}304 305static const struct of_device_id mpq7920_of_match[] = {306 { .compatible = "mps,mpq7920"},307 {},308};309MODULE_DEVICE_TABLE(of, mpq7920_of_match);310 311static const struct i2c_device_id mpq7920_id[] = {312 { "mpq7920", },313 { },314};315MODULE_DEVICE_TABLE(i2c, mpq7920_id);316 317static struct i2c_driver mpq7920_regulator_driver = {318 .driver = {319 .name = "mpq7920",320 .probe_type = PROBE_PREFER_ASYNCHRONOUS,321 .of_match_table = mpq7920_of_match,322 },323 .probe = mpq7920_i2c_probe,324 .id_table = mpq7920_id,325};326module_i2c_driver(mpq7920_regulator_driver);327 328MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");329MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver");330MODULE_LICENSE("GPL");331