Add support for Texas Instruments TPS6287x, single-channel synchronous step-down converters with four output voltage ranges. Signed-off-by: Mårten Lindahl <marten.lindahl@xxxxxxxx> --- drivers/regulator/Kconfig | 11 ++ drivers/regulator/Makefile | 1 + drivers/regulator/tps6287x-regulator.c | 289 +++++++++++++++++++++++++++++++++ 3 files changed, 301 insertions(+) diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index aae28d0a489c..d7923ac53f53 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -1374,6 +1374,17 @@ config REGULATOR_TPS6286X high-frequency synchronous step-down converters with an I2C interface. +config REGULATOR_TPS6287X + tristate "TI TPS6287x Power Regulator" + depends on I2C && OF + select REGMAP_I2C + help + This driver supports TPS6287x voltage regulator chips. These are + pin-to-pin high-frequency synchronous step-down dc-dc converters + with an I2C interface. + + If built as a module it will be called tps6287x-regulator. + config REGULATOR_TPS65023 tristate "TI TPS65023 Power regulators" depends on I2C diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index ee383d8fc835..857995db3fa4 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -161,6 +161,7 @@ obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o obj-$(CONFIG_REGULATOR_TPS62360) += tps62360-regulator.o obj-$(CONFIG_REGULATOR_TPS6286X) += tps6286x-regulator.o +obj-$(CONFIG_REGULATOR_TPS6287X) += tps6287x-regulator.o obj-$(CONFIG_REGULATOR_TPS65023) += tps65023-regulator.o obj-$(CONFIG_REGULATOR_TPS6507X) += tps6507x-regulator.o obj-$(CONFIG_REGULATOR_TPS65086) += tps65086-regulator.o diff --git a/drivers/regulator/tps6287x-regulator.c b/drivers/regulator/tps6287x-regulator.c new file mode 100644 index 000000000000..644549b6856e --- /dev/null +++ b/drivers/regulator/tps6287x-regulator.c @@ -0,0 +1,289 @@ +// 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/module.h> +#include <linux/of_device.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> + +#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 + +#define TPS6287X_VRANGE_DFLT 2 +#define TPS6287X_MIN_UV_DFLT 400000 +#define TPS6287X_MAX_UV_DFLT 1675000 +#define TPS6287X_STEP_UV_DFLT 5000 + +struct tps6287x_chip { + struct regulator_dev *rdev; + struct regmap *regmap; + unsigned int uv_step; +}; + +static const struct regmap_config tps6287x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = TPS6287X_STATUS, +}; + +/* min_uv, max_uv, uv_step */ +static const unsigned int tps6287x_voltage_table[][3] = { + { 400000, 718750, 1250 }, + { 400000, 1037500, 2500 }, + { 400000, 1675000, 5000 }, + { 800000, 3350000, 10000 }, +}; + +static const unsigned int tps6287x_ramp_table[] = { + 10000, 5000, 1250, 500 +}; + +static int tps6287x_get_voltage(struct regulator_dev *rdev) +{ + struct device *dev = rdev_get_dev(rdev); + struct tps6287x_chip *chip = + i2c_get_clientdata(to_i2c_client(dev->parent)); + unsigned int val; + int ret; + + ret = regmap_read(rdev->regmap, TPS6287X_VSET, &val); + if (ret != 0) + return -ENOTRECOVERABLE; + + return (val * chip->uv_step) + rdev->constraints->min_uV; +} + +static int tps6287x_set_voltage(struct regulator_dev *rdev, int min_uv, + int max_uv, unsigned int *selector) +{ + struct device *dev = rdev_get_dev(rdev); + struct tps6287x_chip *chip = + i2c_get_clientdata(to_i2c_client(dev->parent)); + int val = min_uv; + + *selector = 0; + + if (val < rdev->constraints->min_uV) + val = rdev->constraints->min_uV; + if (val > rdev->constraints->max_uV) + val = rdev->constraints->max_uV; + + val -= rdev->constraints->min_uV; + val = DIV_ROUND_CLOSEST(val, chip->uv_step); + + return regmap_write(rdev->regmap, TPS6287X_VSET, val); +} + +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 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 = tps6287x_get_voltage, + .set_voltage = tps6287x_set_voltage, + .set_ramp_delay = regulator_set_ramp_delay_regmap, +}; + +static struct regulator_desc tps6287x_reg = { + .name = "tps6287x", + .of_match = of_match_ptr("vout"), + .owner = THIS_MODULE, + .ops = &tps6287x_regulator_ops, + .of_map_mode = tps6287x_of_map_mode, + .regulators_node = of_match_ptr("regulators"), + .type = REGULATOR_VOLTAGE, + .enable_reg = TPS6287X_CTRL1, + .enable_mask = TPS6287X_CTRL1_SWEN, + .ramp_reg = TPS6287X_CTRL1, + .ramp_mask = TPS6287X_CTRL1_VRAMP, + .ramp_delay_table = tps6287x_ramp_table, + .n_ramp_values = ARRAY_SIZE(tps6287x_ramp_table), +}; + +static int tps6287x_setup_vrange(struct tps6287x_chip *chip) +{ + struct regulator_dev *rdev = chip->rdev; + unsigned int val, r; + bool found = false; + int ret; + + /* + * Match DT voltage range to one of the predefined ranges, + * and configure the regulator with the selected range. + */ + for (r = 0; r < ARRAY_SIZE(tps6287x_voltage_table); r++) { + if (tps6287x_voltage_table[r][0] == rdev->constraints->min_uV && + tps6287x_voltage_table[r][1] == rdev->constraints->max_uV) { + found = true; + break; + } + } + + if (!found) { + dev_warn(rdev_get_dev(rdev)->parent, "Missing or invalid voltage range. Using default.\n"); + rdev->constraints->min_uV = TPS6287X_MIN_UV_DFLT; + rdev->constraints->max_uV = TPS6287X_MAX_UV_DFLT; + return 0; + } + + if (r == TPS6287X_VRANGE_DFLT) + return 0; + + ret = regmap_update_bits(chip->regmap, TPS6287X_CTRL2, + TPS6287X_CTRL2_VRANGE, + FIELD_PREP(TPS6287X_CTRL2_VRANGE, r)); + if (ret < 0) + return ret; + + chip->uv_step = tps6287x_voltage_table[r][2]; + + /* + * When voltage range is changed the setpoint register must be cleared + * and rewritten to make the regulator start using the new range. + */ + ret = regmap_read(rdev->regmap, TPS6287X_VSET, &val); + if (ret != 0) + return ret; + + ret = regmap_write(rdev->regmap, TPS6287X_VSET, 0); + if (ret != 0) + return ret; + + return regmap_write(rdev->regmap, TPS6287X_VSET, val); +} + +static int tps6287x_i2c_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + struct regulator_config config = {}; + struct tps6287x_chip *chip; + int ret; + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->uv_step = TPS6287X_STEP_UV_DFLT; + + chip->regmap = devm_regmap_init_i2c(i2c, &tps6287x_regmap_config); + if (IS_ERR(chip->regmap)) { + dev_err(dev, "Failed to init i2c\n"); + return PTR_ERR(chip->regmap); + } + + i2c_set_clientdata(i2c, chip); + + config.dev = dev; + config.of_node = dev->of_node; + config.regmap = chip->regmap; + + chip->rdev = devm_regulator_register(dev, &tps6287x_reg, &config); + if (IS_ERR(chip->rdev)) { + dev_err(dev, "Failed to register regulator\n"); + return PTR_ERR(chip->rdev); + } + + ret = tps6287x_setup_vrange(chip); + if (ret) + return ret; + + 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", 0 }, + { "tps62871", 0 }, + { "tps62872", 0 }, + { "tps62873", 0 }, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, tps6287x_i2c_id); + +static struct i2c_driver tps6287x_regulator_driver = { + .driver = { + .name = "tps6287x", + .of_match_table = tps6287x_dt_ids, + }, + .probe_new = tps6287x_i2c_probe, + .id_table = tps6287x_i2c_id, +}; + +module_i2c_driver(tps6287x_regulator_driver); + +MODULE_AUTHOR("Mårten Lindahl <marten.lindahl@xxxxxxxx>"); +MODULE_DESCRIPTION("Regulator driver for TI TPS6287X PMIC"); +MODULE_LICENSE("GPL"); -- 2.30.2
