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