diff options
Diffstat (limited to 'drivers/regulator/max77838-regulator.c')
| -rw-r--r-- | drivers/regulator/max77838-regulator.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/regulator/max77838-regulator.c b/drivers/regulator/max77838-regulator.c new file mode 100644 index 000000000000..9faddbfd25fd --- /dev/null +++ b/drivers/regulator/max77838-regulator.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +// +// regulator driver for Maxim MAX77838 +// +// based on max77826-regulator.c +// +// Copyright (c) 2025, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com> + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/of_regulator.h> +#include <linux/i2c.h> +#include <linux/regmap.h> + +enum max77838_registers { + MAX77838_REG_DEVICE_ID = 0x00, + MAX77838_REG_TOPSYS_STAT, + MAX77838_REG_STAT, + MAX77838_REG_EN, + MAX77838_REG_GPIO_PD_CTRL, + MAX77838_REG_UVLO_CFG1, + /* 0x06 - 0x0B: reserved */ + MAX77838_REG_I2C_CFG = 0x0C, + /* 0x0D - 0x0F: reserved */ + MAX77838_REG_LDO1_CFG = 0x10, + MAX77838_REG_LDO2_CFG, + MAX77838_REG_LDO3_CFG, + MAX77838_REG_LDO4_CFG, + /* 0x14 - 0x1F: reserved */ + MAX77838_REG_BUCK_CFG1 = 0x20, + MAX77838_REG_BUCK_VOUT, +}; + +enum max77838_regulators { + MAX77838_LDO1 = 0, + MAX77838_LDO2, + MAX77838_LDO3, + MAX77838_LDO4, + MAX77838_BUCK, + MAX77838_MAX_REGULATORS, +}; + +#define MAX77838_MASK_LDO 0x7f +#define MAX77838_MASK_BUCK 0xff + +#define MAX77838_LDO1_EN BIT(0) +#define MAX77838_LDO2_EN BIT(1) +#define MAX77838_LDO3_EN BIT(2) +#define MAX77838_LDO4_EN BIT(3) +#define MAX77838_BUCK_EN BIT(4) + +#define MAX77838_BUCK_AD BIT(3) +#define MAX77838_LDO_AD BIT(7) + +#define MAX77838_LDO_VOLT_MIN 600000 +#define MAX77838_LDO_VOLT_MAX 3775000 +#define MAX77838_LDO_VOLT_STEP 25000 + +#define MAX77838_BUCK_VOLT_MIN 500000 +#define MAX77838_BUCK_VOLT_MAX 2093750 +#define MAX77838_BUCK_VOLT_STEP 6250 + +#define MAX77838_VOLT_RANGE(_type) \ + ((MAX77838_ ## _type ## _VOLT_MAX - \ + MAX77838_ ## _type ## _VOLT_MIN) / \ + MAX77838_ ## _type ## _VOLT_STEP + 1) + +#define MAX77838_LDO(_id) \ + [MAX77838_LDO ## _id] = { \ + .id = MAX77838_LDO ## _id, \ + .name = "ldo"#_id, \ + .of_match = of_match_ptr("ldo"#_id), \ + .regulators_node = "regulators", \ + .ops = &max77838_regulator_ops, \ + .min_uV = MAX77838_LDO_VOLT_MIN, \ + .uV_step = MAX77838_LDO_VOLT_STEP, \ + .n_voltages = MAX77838_VOLT_RANGE(LDO), \ + .enable_reg = MAX77838_REG_EN, \ + .enable_mask = MAX77838_LDO ## _id ## _EN, \ + .vsel_reg = MAX77838_REG_LDO ## _id ## _CFG, \ + .vsel_mask = MAX77838_MASK_LDO, \ + .active_discharge_off = 0, \ + .active_discharge_on = MAX77838_LDO_AD, \ + .active_discharge_mask = MAX77838_LDO_AD, \ + .active_discharge_reg = MAX77838_REG_LDO ## _id ## _CFG, \ + .owner = THIS_MODULE, \ + } + +#define MAX77838_BUCK_DESC \ + [MAX77838_BUCK] = { \ + .id = MAX77838_BUCK, \ + .name = "buck", \ + .of_match = of_match_ptr("buck"), \ + .regulators_node = "regulators", \ + .ops = &max77838_regulator_ops, \ + .min_uV = MAX77838_BUCK_VOLT_MIN, \ + .uV_step = MAX77838_BUCK_VOLT_STEP, \ + .n_voltages = MAX77838_VOLT_RANGE(BUCK), \ + .enable_reg = MAX77838_REG_EN, \ + .enable_mask = MAX77838_BUCK_EN, \ + .vsel_reg = MAX77838_REG_BUCK_VOUT, \ + .vsel_mask = MAX77838_MASK_BUCK, \ + .active_discharge_off = 0, \ + .active_discharge_on = MAX77838_BUCK_AD, \ + .active_discharge_mask = MAX77838_BUCK_AD, \ + .active_discharge_reg = MAX77838_REG_BUCK_CFG1, \ + .owner = THIS_MODULE, \ + } + +struct max77838_regulator_info { + struct regmap *regmap; +}; + +static const struct regmap_config max77838_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = MAX77838_REG_BUCK_VOUT, +}; + +static const struct regulator_ops max77838_regulator_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .list_voltage = regulator_list_voltage_linear, + .map_voltage = regulator_map_voltage_linear, + .get_voltage_sel = regulator_get_voltage_sel_regmap, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .set_active_discharge = regulator_set_active_discharge_regmap, +}; + +static const struct regulator_desc max77838_regulators_desc[] = { + MAX77838_LDO(1), + MAX77838_LDO(2), + MAX77838_LDO(3), + MAX77838_LDO(4), + MAX77838_BUCK_DESC, +}; + +static int max77838_read_device_id(struct regmap *regmap, struct device *dev) +{ + unsigned int device_id; + int ret; + + ret = regmap_read(regmap, MAX77838_REG_DEVICE_ID, &device_id); + if (!ret) + dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id); + + return ret; +} + +static int max77838_i2c_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct max77838_regulator_info *info; + struct regulator_config config = {}; + struct regulator_dev *rdev; + struct regmap *regmap; + int i; + + info = devm_kzalloc(dev, sizeof(struct max77838_regulator_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &max77838_regmap_config); + if (IS_ERR(regmap)) { + dev_err(dev, "Failed to allocate regmap!\n"); + return PTR_ERR(regmap); + } + + info->regmap = regmap; + i2c_set_clientdata(client, info); + + config.dev = dev; + config.regmap = regmap; + config.driver_data = info; + + for (i = 0; i < MAX77838_MAX_REGULATORS; i++) { + rdev = devm_regulator_register(dev, + &max77838_regulators_desc[i], + &config); + if (IS_ERR(rdev)) { + dev_err(dev, "Failed to register regulator!\n"); + return PTR_ERR(rdev); + } + } + + return max77838_read_device_id(regmap, dev); +} + +static const struct of_device_id __maybe_unused max77838_of_match[] = { + { .compatible = "maxim,max77838" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, max77838_of_match); + +static const struct i2c_device_id max77838_id[] = { + { "max77838-regulator" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, max77838_id); + +static struct i2c_driver max77838_regulator_driver = { + .driver = { + .name = "max77838", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = of_match_ptr(max77838_of_match), + }, + .probe = max77838_i2c_probe, + .id_table = max77838_id, +}; +module_i2c_driver(max77838_regulator_driver); + +MODULE_AUTHOR("Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>"); +MODULE_DESCRIPTION("MAX77838 PMIC regulator driver"); +MODULE_LICENSE("GPL"); |