diff options
Diffstat (limited to 'drivers/regulator/tps6287x-regulator.c')
| -rw-r--r-- | drivers/regulator/tps6287x-regulator.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/regulator/tps6287x-regulator.c b/drivers/regulator/tps6287x-regulator.c new file mode 100644 index 000000000000..7b7d3ae39206 --- /dev/null +++ b/drivers/regulator/tps6287x-regulator.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2023 Axis Communications AB + * + * Driver for Texas Instruments TPS6287x PMIC. + * Datasheet: https://www.ti.com/lit/ds/symlink/tps62873.pdf + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/regulator/of_regulator.h> +#include <linux/regulator/machine.h> +#include <linux/regulator/driver.h> +#include <linux/bitfield.h> +#include <linux/linear_range.h> + +#define TPS6287X_VSET 0x00 +#define TPS6287X_CTRL1 0x01 +#define TPS6287X_CTRL1_VRAMP GENMASK(1, 0) +#define TPS6287X_CTRL1_FPWMEN BIT(4) +#define TPS6287X_CTRL1_SWEN BIT(5) +#define TPS6287X_CTRL2 0x02 +#define TPS6287X_CTRL2_VRANGE GENMASK(3, 2) +#define TPS6287X_CTRL3 0x03 +#define TPS6287X_STATUS 0x04 + +static bool tps6287x_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg == TPS6287X_STATUS; +} + +static const struct regmap_config tps6287x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = TPS6287X_STATUS, + .cache_type = REGCACHE_MAPLE, + .volatile_reg = tps6287x_volatile_reg, +}; + +static const struct linear_range tps6287x_voltage_ranges[] = { + LINEAR_RANGE(400000, 0, 0xFF, 1250), + LINEAR_RANGE(400000, 0, 0xFF, 2500), + LINEAR_RANGE(400000, 0, 0xFF, 5000), + LINEAR_RANGE(800000, 0, 0xFF, 10000), +}; + +static const unsigned int tps6287x_voltage_range_sel[] = { + 0x0, 0x1, 0x2, 0x3 +}; + +static const unsigned int tps6287x_voltage_range_prefix[] = { + 0x000, 0x100, 0x200, 0x300 +}; + +static const unsigned int tps6287x_ramp_table[] = { + 10000, 5000, 1250, 500 +}; + +struct tps6287x_reg_data { + int range; +}; + +static int tps6287x_best_range(struct regulator_config *config, const struct regulator_desc *desc) +{ + const struct linear_range *r; + int i; + + if (!config->init_data->constraints.apply_uV) + return -1; + + for (i = 0; i < desc->n_linear_ranges; i++) { + r = &desc->linear_ranges[i]; + if (r->min <= config->init_data->constraints.min_uV && + config->init_data->constraints.max_uV <= linear_range_get_max_value(r)) + return i; + } + return -1; +} + +static int tps6287x_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + unsigned int val; + + switch (mode) { + case REGULATOR_MODE_NORMAL: + val = 0; + break; + case REGULATOR_MODE_FAST: + val = TPS6287X_CTRL1_FPWMEN; + break; + default: + return -EINVAL; + } + + return regmap_update_bits(rdev->regmap, TPS6287X_CTRL1, + TPS6287X_CTRL1_FPWMEN, val); +} + +static unsigned int tps6287x_get_mode(struct regulator_dev *rdev) +{ + unsigned int val; + int ret; + + ret = regmap_read(rdev->regmap, TPS6287X_CTRL1, &val); + if (ret < 0) + return 0; + + return (val & TPS6287X_CTRL1_FPWMEN) ? REGULATOR_MODE_FAST : + REGULATOR_MODE_NORMAL; +} + +static unsigned int tps6287x_of_map_mode(unsigned int mode) +{ + switch (mode) { + case REGULATOR_MODE_NORMAL: + case REGULATOR_MODE_FAST: + return mode; + default: + return REGULATOR_MODE_INVALID; + } +} + +static int tps6287x_map_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) +{ + struct tps6287x_reg_data *data = (struct tps6287x_reg_data *)rdev->reg_data; + struct linear_range selected_range; + int selector, voltage; + + if (!data || data->range == -1) + return regulator_map_voltage_pickable_linear_range(rdev, min_uV, max_uV); + + selected_range = rdev->desc->linear_ranges[data->range]; + selector = DIV_ROUND_UP(min_uV - selected_range.min, selected_range.step); + if (selector < selected_range.min_sel || selector > selected_range.max_sel) + return -EINVAL; + + selector |= tps6287x_voltage_range_prefix[data->range]; + voltage = rdev->desc->ops->list_voltage(rdev, selector); + if (voltage < min_uV || voltage > max_uV) + return -EINVAL; + + return selector; +} + +static const struct regulator_ops tps6287x_regulator_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .set_mode = tps6287x_set_mode, + .get_mode = tps6287x_get_mode, + .is_enabled = regulator_is_enabled_regmap, + .get_voltage_sel = regulator_get_voltage_sel_pickable_regmap, + .set_voltage_sel = regulator_set_voltage_sel_pickable_regmap, + .list_voltage = regulator_list_voltage_pickable_linear_range, + .map_voltage = tps6287x_map_voltage, + .set_ramp_delay = regulator_set_ramp_delay_regmap, +}; + +static const struct regulator_desc tps6287x_reg = { + .name = "tps6287x", + .owner = THIS_MODULE, + .ops = &tps6287x_regulator_ops, + .of_map_mode = tps6287x_of_map_mode, + .type = REGULATOR_VOLTAGE, + .enable_reg = TPS6287X_CTRL1, + .enable_mask = TPS6287X_CTRL1_SWEN, + .vsel_reg = TPS6287X_VSET, + .vsel_mask = 0xFF, + .vsel_range_reg = TPS6287X_CTRL2, + .vsel_range_mask = TPS6287X_CTRL2_VRANGE, + .range_applied_by_vsel = true, + .ramp_reg = TPS6287X_CTRL1, + .ramp_mask = TPS6287X_CTRL1_VRAMP, + .ramp_delay_table = tps6287x_ramp_table, + .n_ramp_values = ARRAY_SIZE(tps6287x_ramp_table), + .n_voltages = 256 * ARRAY_SIZE(tps6287x_voltage_ranges), + .linear_ranges = tps6287x_voltage_ranges, + .n_linear_ranges = ARRAY_SIZE(tps6287x_voltage_ranges), + .linear_range_selectors_bitfield = tps6287x_voltage_range_sel, +}; + +static int tps6287x_i2c_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + struct regulator_config config = {}; + struct tps6287x_reg_data *reg_data; + struct regulator_dev *rdev; + + reg_data = devm_kzalloc(dev, sizeof(struct tps6287x_reg_data), GFP_KERNEL); + + if (!reg_data) + return -ENOMEM; + + config.regmap = devm_regmap_init_i2c(i2c, &tps6287x_regmap_config); + if (IS_ERR(config.regmap)) { + dev_err(dev, "Failed to init i2c\n"); + return PTR_ERR(config.regmap); + } + + config.dev = dev; + config.of_node = dev->of_node; + config.init_data = of_get_regulator_init_data(dev, dev->of_node, + &tps6287x_reg); + + reg_data->range = tps6287x_best_range(&config, &tps6287x_reg); + + rdev = devm_regulator_register(dev, &tps6287x_reg, &config); + if (IS_ERR(rdev)) { + dev_err(dev, "Failed to register regulator\n"); + return PTR_ERR(rdev); + } + + rdev->reg_data = (void *)reg_data; + dev_dbg(dev, "Probed regulator\n"); + + return 0; +} + +static const struct of_device_id tps6287x_dt_ids[] = { + { .compatible = "ti,tps62870", }, + { .compatible = "ti,tps62871", }, + { .compatible = "ti,tps62872", }, + { .compatible = "ti,tps62873", }, + { } +}; + +MODULE_DEVICE_TABLE(of, tps6287x_dt_ids); + +static const struct i2c_device_id tps6287x_i2c_id[] = { + { "tps62870" }, + { "tps62871" }, + { "tps62872" }, + { "tps62873" }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id); + +static struct i2c_driver tps6287x_regulator_driver = { + .driver = { + .name = "tps6287x", + .of_match_table = tps6287x_dt_ids, + }, + .probe = tps6287x_i2c_probe, + .id_table = tps6287x_i2c_id, +}; + +module_i2c_driver(tps6287x_regulator_driver); + +MODULE_AUTHOR("Mårten Lindahl <marten.lindahl@axis.com>"); +MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC"); +MODULE_LICENSE("GPL"); |