331 lines
9.5 KiB
C
331 lines
9.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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//
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// mpq7920.c - regulator driver for mps mpq7920
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//
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// Copyright 2019 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/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include "mpq7920.h"
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#define MPQ7920_BUCK_VOLT_RANGE \
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((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
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#define MPQ7920_LDO_VOLT_RANGE \
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((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1)
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#define MPQ7920BUCK(_name, _id, _ilim) \
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[MPQ7920_BUCK ## _id] = { \
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.id = MPQ7920_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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.of_parse_cb = mpq7920_parse_cb, \
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.ops = &mpq7920_buck_ops, \
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.min_uV = MPQ7920_BUCK_VOLT_MIN, \
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.uV_step = MPQ7920_VOLT_STEP, \
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.n_voltages = MPQ7920_BUCK_VOLT_RANGE, \
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.curr_table = _ilim, \
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.n_current_limits = ARRAY_SIZE(_ilim), \
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.csel_reg = MPQ7920_BUCK ##_id## _REG_C, \
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.csel_mask = MPQ7920_MASK_BUCK_ILIM, \
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.enable_reg = MPQ7920_REG_REGULATOR_EN, \
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.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
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MPQ7920_BUCK ## _id), \
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.vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \
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.vsel_mask = MPQ7920_MASK_VREF, \
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.active_discharge_on = MPQ7920_DISCHARGE_ON, \
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.active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \
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.active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
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.soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \
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.soft_start_mask = MPQ7920_MASK_SOFTSTART, \
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.owner = THIS_MODULE, \
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}
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#define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \
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[MPQ7920_LDO ## _id] = { \
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.id = MPQ7920_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 = _ops, \
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.min_uV = MPQ7920_LDO_VOLT_MIN, \
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.uV_step = MPQ7920_VOLT_STEP, \
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.n_voltages = MPQ7920_LDO_VOLT_RANGE, \
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.vsel_reg = MPQ7920_LDO ##_id## _REG_A, \
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.vsel_mask = MPQ7920_MASK_VREF, \
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.curr_table = _ilim, \
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.n_current_limits = _ilim_sz, \
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.csel_reg = _creg, \
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.csel_mask = _cmask, \
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.enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\
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.enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \
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MPQ7920_LDO ##_id + 1), \
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.active_discharge_on = MPQ7920_DISCHARGE_ON, \
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.active_discharge_mask = MPQ7920_MASK_DISCHARGE, \
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.active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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}
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enum mpq7920_regulators {
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MPQ7920_BUCK1,
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MPQ7920_BUCK2,
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MPQ7920_BUCK3,
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MPQ7920_BUCK4,
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MPQ7920_LDO1, /* LDORTC */
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MPQ7920_LDO2,
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MPQ7920_LDO3,
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MPQ7920_LDO4,
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MPQ7920_LDO5,
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MPQ7920_MAX_REGULATORS,
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};
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struct mpq7920_regulator_info {
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struct regmap *regmap;
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struct regulator_desc *rdesc;
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};
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static const struct regmap_config mpq7920_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0x25,
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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 mpq7920_I_limits1[] = {
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4600000, 6600000, 7600000, 9300000
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};
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/* ILIM2 & ILIM4 */
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static const unsigned int mpq7920_I_limits2[] = {
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2700000, 3900000, 5100000, 6100000
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};
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/* LDO4 & LDO5 */
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static const unsigned int mpq7920_I_limits3[] = {
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300000, 700000
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};
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static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
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static int mpq7920_parse_cb(struct device_node *np,
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const struct regulator_desc *rdesc,
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struct regulator_config *config);
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/* RTCLDO not controllable, always ON */
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static const struct regulator_ops mpq7920_ldortc_ops = {
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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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};
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static const struct regulator_ops mpq7920_ldo_wo_current_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 mpq7920_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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.get_current_limit = regulator_get_current_limit_regmap,
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.set_current_limit = regulator_set_current_limit_regmap,
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};
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static const struct regulator_ops mpq7920_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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.set_soft_start = regulator_set_soft_start_regmap,
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.set_ramp_delay = mpq7920_set_ramp_delay,
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};
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static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = {
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MPQ7920BUCK("buck1", 1, mpq7920_I_limits1),
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MPQ7920BUCK("buck2", 2, mpq7920_I_limits2),
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MPQ7920BUCK("buck3", 3, mpq7920_I_limits1),
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MPQ7920BUCK("buck4", 4, mpq7920_I_limits2),
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MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0),
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MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
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MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0),
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MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3,
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ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B,
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MPQ7920_MASK_LDO_ILIM),
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MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3,
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ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B,
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MPQ7920_MASK_LDO_ILIM),
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};
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/*
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* DVS ramp rate BUCK1 to BUCK4
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* 00-01: Reserved
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* 10: 8mV/us
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* 11: 4mV/us
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*/
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static int mpq7920_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 > 8000 || 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
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ramp_val = 2;
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return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0,
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MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6);
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}
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static int mpq7920_parse_cb(struct device_node *np,
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const struct regulator_desc *desc,
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struct regulator_config *config)
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{
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uint8_t val;
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int ret;
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struct mpq7920_regulator_info *info = config->driver_data;
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struct regulator_desc *rdesc = &info->rdesc[desc->id];
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if (of_property_read_bool(np, "mps,buck-ovp-disable")) {
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regmap_update_bits(config->regmap,
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MPQ7920_BUCK1_REG_B + (rdesc->id * 4),
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MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE);
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}
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ret = of_property_read_u8(np, "mps,buck-phase-delay", &val);
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if (!ret) {
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regmap_update_bits(config->regmap,
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MPQ7920_BUCK1_REG_C + (rdesc->id * 4),
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MPQ7920_MASK_BUCK_PHASE_DEALY,
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(val & 3) << 4);
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}
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ret = of_property_read_u8(np, "mps,buck-softstart", &val);
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if (!ret)
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rdesc->soft_start_val_on = (val & 3) << 2;
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return 0;
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}
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static void mpq7920_parse_dt(struct device *dev,
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struct mpq7920_regulator_info *info)
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{
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int ret;
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struct device_node *np = dev->of_node;
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uint8_t freq;
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np = of_get_child_by_name(np, "regulators");
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if (!np) {
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dev_err(dev, "missing 'regulators' subnode in DT\n");
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return;
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}
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ret = of_property_read_u8(np, "mps,switch-freq", &freq);
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if (!ret) {
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regmap_update_bits(info->regmap, MPQ7920_REG_CTL0,
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MPQ7920_MASK_SWITCH_FREQ,
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(freq & 3) << 4);
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}
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of_node_put(np);
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}
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static int mpq7920_i2c_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct mpq7920_regulator_info *info;
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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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info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->rdesc = mpq7920_regulators_desc;
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regmap = devm_regmap_init_i2c(client, &mpq7920_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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i2c_set_clientdata(client, info);
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info->regmap = regmap;
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if (client->dev.of_node)
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mpq7920_parse_dt(&client->dev, info);
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config.dev = dev;
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config.regmap = regmap;
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config.driver_data = info;
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for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) {
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rdev = devm_regulator_register(dev,
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&mpq7920_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 mpq7920_of_match[] = {
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{ .compatible = "mps,mpq7920"},
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{},
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};
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MODULE_DEVICE_TABLE(of, mpq7920_of_match);
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static const struct i2c_device_id mpq7920_id[] = {
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{ "mpq7920", },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mpq7920_id);
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static struct i2c_driver mpq7920_regulator_driver = {
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.driver = {
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.name = "mpq7920",
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.of_match_table = of_match_ptr(mpq7920_of_match),
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},
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.probe_new = mpq7920_i2c_probe,
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.id_table = mpq7920_id,
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};
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module_i2c_driver(mpq7920_regulator_driver);
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MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
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MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver");
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||
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MODULE_LICENSE("GPL");
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