diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig index 78076ac6eac4..9fcdeabb2be1 100644 --- a/drivers/regulator/Kconfig +++ b/drivers/regulator/Kconfig @@ -1490,6 +1490,14 @@ config REGULATOR_SC2731 This driver provides support for the voltage regulators on the SC2731 PMIC. +config REGULATOR_SGM3804 + tristate "SGMicro SGM3804 voltage regulator" + depends on I2C && OF + depends on GPIOLIB + select REGMAP_I2C + help + This driver supports SGMicro SGM3804 dual-output voltage regulator. + config REGULATOR_SKY81452 tristate "Skyworks Solutions SKY81452 voltage regulator" depends on MFD_SKY81452 diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index 35639f3115fd..98ecbbc3c6b7 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -172,6 +172,7 @@ obj-$(CONFIG_REGULATOR_S2MPA01) += s2mpa01.o obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o obj-$(CONFIG_REGULATOR_SC2731) += sc2731-regulator.o +obj-$(CONFIG_REGULATOR_SGM3804) += sgm3804-regulator.o obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o obj-$(CONFIG_REGULATOR_SLG51000) += slg51000-regulator.o obj-$(CONFIG_REGULATOR_SPACEMIT_P1) += spacemit-p1.o diff --git a/drivers/regulator/sgm3804-regulator.c b/drivers/regulator/sgm3804-regulator.c new file mode 100644 index 000000000000..c3406cfb73d0 --- /dev/null +++ b/drivers/regulator/sgm3804-regulator.c @@ -0,0 +1,314 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// SGMicro SGM3804 regulator Driver +// +// Copyright (C) 2025 Kancy Joe +// Copyright (C) 2026 Linaro Limited +// Author: Neil Armstrong + +#include +#include +#include +#include +#include +#include +#include + +#define SGM3804_POS_RAIL_VOLTAGE_REG 0x0 +#define SGM3804_NEG_RAIL_VOLTAGE_REG 0x1 +#define SGM3804_RAIL_DISCHARGE_REG 0x3 + +#define RAIL_VOLTAGE_MASK GENMASK(5, 0) + +#define POS_RAIL_DISCHARGE_EN BIT(1) +#define NEG_RAIL_DISCHARGE_EN BIT(0) + +#define RAIL_VOLTAGE_INVALID RAIL_VOLTAGE_MASK +#define RAIL_DISCHARGE_REG_DEFAULT (POS_RAIL_DISCHARGE_EN | NEG_RAIL_DISCHARGE_EN) + +#define SGM3804_VOLTAGES_MAX_SELECTOR 0x2f + +enum { + SGM3804_POS_RAIL = 0, + SGM3804_NEG_RAIL, + SGM3804_RAIL_COUNT, +}; + +/* + * The registers are only writable when the gpio is enabled, so + * we need to use the cache for read operations and set the regmap + * as cache_only when both GPIOs are down. + */ +struct sgm3804_data { + struct regmap *regmap; + /* Protects the regcache state update */ + struct mutex lock; + struct gpio_desc *gpios[SGM3804_RAIL_COUNT]; +}; + +static const struct linear_range sgm3804_voltages[] = { + REGULATOR_LINEAR_RANGE(2400000, 0x20, 0x2f, 100000), + REGULATOR_LINEAR_RANGE(4000000, 0x00, 0x17, 100000), +}; + +/* + * The cache is populated with those hardware default values + * so the regmap_update_bits operation will use the cached + * value to build a new register value and write it when GPIOs + * are enabled. + */ +static const struct reg_default sgm3804_reg_defaults[] = { + { SGM3804_POS_RAIL_VOLTAGE_REG, RAIL_VOLTAGE_INVALID }, + { SGM3804_NEG_RAIL_VOLTAGE_REG, RAIL_VOLTAGE_INVALID }, + { SGM3804_RAIL_DISCHARGE_REG, RAIL_DISCHARGE_REG_DEFAULT }, +}; + +/* Registers are only writable */ +static bool sgm3804_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case SGM3804_POS_RAIL_VOLTAGE_REG: + case SGM3804_NEG_RAIL_VOLTAGE_REG: + case SGM3804_RAIL_DISCHARGE_REG: + return true; + default: + return false; + } +} + +/* + * Since all registers are only writeable, regmap will only read from the cache data. + */ +static bool sgm3804_readable_reg(struct device *dev, unsigned int reg) +{ + return false; +} + +static const struct regmap_config sgm3804_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x03, + .writeable_reg = sgm3804_writeable_reg, + .readable_reg = sgm3804_readable_reg, + .cache_type = REGCACHE_MAPLE, + .reg_defaults = sgm3804_reg_defaults, + .num_reg_defaults = ARRAY_SIZE(sgm3804_reg_defaults), +}; + +static int sgm3804_sync_regcache_state(struct sgm3804_data *ctx) +{ + guard(mutex)(&ctx->lock); + + /* If both GPIOs are down, IC is powered down and I2C writes will fail */ + if (!gpiod_get_value_cansleep(ctx->gpios[SGM3804_POS_RAIL]) && + !gpiod_get_value_cansleep(ctx->gpios[SGM3804_NEG_RAIL])) { + regcache_cache_only(ctx->regmap, true); + regcache_mark_dirty(ctx->regmap); + } else { + int ret; + + /* At least a GPIO is up, we can write registers */ + regcache_cache_only(ctx->regmap, false); + ret = regcache_sync(ctx->regmap); + if (ret) { + regcache_cache_only(ctx->regmap, true); + return ret; + } + } + + return 0; +} + +static int sgm3804_get_voltage_sel(struct regulator_dev *rdev) +{ + int ret; + + ret = regulator_get_voltage_sel_regmap(rdev); + if (ret < 0) + return ret; + + /* Force setting a voltage on probe */ + if (ret == RAIL_VOLTAGE_INVALID) + return -ENOTRECOVERABLE; + + return ret; +} + +static int sgm3804_enable(struct regulator_dev *rdev) +{ + struct sgm3804_data *ctx = rdev->reg_data; + int ret; + + ret = gpiod_set_value_cansleep(ctx->gpios[rdev_get_id(rdev)], 1); + if (ret) + return ret; + + ret = sgm3804_sync_regcache_state(ctx); + if (ret) + goto err; + + return 0; + +err: + gpiod_set_value_cansleep(ctx->gpios[rdev_get_id(rdev)], 0); + return ret; +} + +static int sgm3804_disable(struct regulator_dev *rdev) +{ + struct sgm3804_data *ctx = rdev->reg_data; + int ret; + + ret = gpiod_set_value_cansleep(ctx->gpios[rdev_get_id(rdev)], 0); + if (ret) + return ret; + + return sgm3804_sync_regcache_state(ctx); +} + +static int sgm3804_is_enabled(struct regulator_dev *rdev) +{ + struct sgm3804_data *ctx = rdev->reg_data; + + return gpiod_get_value_cansleep(ctx->gpios[rdev_get_id(rdev)]); +} + +static const struct regulator_ops sgm3804_ops = { + .list_voltage = regulator_list_voltage_linear_range, + .map_voltage = regulator_map_voltage_linear_range, + .set_voltage_sel = regulator_set_voltage_sel_regmap, + .get_voltage_sel = sgm3804_get_voltage_sel, + .set_active_discharge = regulator_set_active_discharge_regmap, + .enable = sgm3804_enable, + .disable = sgm3804_disable, + .is_enabled = sgm3804_is_enabled, +}; + +static const struct regulator_desc sgm3804_regulator_desc[] = { + /* Positive Output */ + { + .name = "pos", + .of_match = "pos", + .supply_name = "vin", + .id = SGM3804_POS_RAIL, + .ops = &sgm3804_ops, + .type = REGULATOR_VOLTAGE, + .linear_ranges = sgm3804_voltages, + .n_linear_ranges = ARRAY_SIZE(sgm3804_voltages), + .n_voltages = SGM3804_VOLTAGES_MAX_SELECTOR + 1, + .vsel_reg = SGM3804_POS_RAIL_VOLTAGE_REG, + .vsel_mask = RAIL_VOLTAGE_MASK, + .active_discharge_on = POS_RAIL_DISCHARGE_EN, + .active_discharge_mask = POS_RAIL_DISCHARGE_EN, + .active_discharge_reg = SGM3804_RAIL_DISCHARGE_REG, + .enable_time = 40000, + .owner = THIS_MODULE, + }, + /* Negative Output */ + { + .name = "neg", + .of_match = "neg", + .supply_name = "vin", + .id = SGM3804_NEG_RAIL, + .ops = &sgm3804_ops, + .type = REGULATOR_VOLTAGE, + .linear_ranges = sgm3804_voltages, + .n_linear_ranges = ARRAY_SIZE(sgm3804_voltages), + .n_voltages = SGM3804_VOLTAGES_MAX_SELECTOR + 1, + .vsel_reg = SGM3804_NEG_RAIL_VOLTAGE_REG, + .vsel_mask = RAIL_VOLTAGE_MASK, + .active_discharge_on = NEG_RAIL_DISCHARGE_EN, + .active_discharge_mask = NEG_RAIL_DISCHARGE_EN, + .active_discharge_reg = SGM3804_RAIL_DISCHARGE_REG, + .enable_time = 40000, + .owner = THIS_MODULE, + }, +}; + +static int sgm3804_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + struct sgm3804_data *ctx; + int ret, i; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + mutex_init(&ctx->lock); + + ctx->regmap = devm_regmap_init_i2c(i2c, &sgm3804_regmap_config); + if (IS_ERR(ctx->regmap)) + return dev_err_probe(dev, PTR_ERR(ctx->regmap), + "failed to init regmap\n"); + + /* Get enable GPIOs */ + for (i = 0; i < ARRAY_SIZE(sgm3804_regulator_desc); i++) { + const struct regulator_desc *reg = &sgm3804_regulator_desc[i]; + struct fwnode_handle *child; + + child = device_get_named_child_node(dev, reg->of_match); + if (!child) { + dev_err(dev, "missing child '%s'\n", reg->of_match); + return -EINVAL; + } + + ctx->gpios[i] = devm_fwnode_gpiod_get(dev, child, "enable", + GPIOD_ASIS, reg->name); + fwnode_handle_put(child); + if (IS_ERR(ctx->gpios[i])) + return dev_err_probe(dev, PTR_ERR(ctx->gpios[i]), + "failed to get '%s' enable GPIO\n", + reg->name); + } + + ret = sgm3804_sync_regcache_state(ctx); + if (ret) + return ret; + + for (i = 0; i < ARRAY_SIZE(sgm3804_regulator_desc); i++) { + struct regulator_config config = { }; + struct regulator_dev *rdev; + + config.dev = dev; + config.regmap = ctx->regmap; + config.of_node = dev_of_node(dev); + config.driver_data = ctx; + rdev = devm_regulator_register(dev, &sgm3804_regulator_desc[i], + &config); + if (IS_ERR(rdev)) + return dev_err_probe(dev, PTR_ERR(rdev), + "failed to register regulator %d\n", i); + } + + return 0; +} + +static const struct i2c_device_id sgm3804_id[] = { + { "sgm3804" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, sgm3804_id); + +static const struct of_device_id sgm3804_of_match[] = { + { .compatible = "sgmicro,sgm3804" }, + { } +}; +MODULE_DEVICE_TABLE(of, sgm3804_of_match); + +static struct i2c_driver sgm3804_regulator_driver = { + .driver = { + .name = "sgm3804", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = sgm3804_of_match, + }, + .probe = sgm3804_probe, + .id_table = sgm3804_id, +}; + +module_i2c_driver(sgm3804_regulator_driver); + +MODULE_DESCRIPTION("SGMicro SGM3804 regulator Driver"); +MODULE_AUTHOR("Kancy Joe "); +MODULE_AUTHOR("Neil Armstrong "); +MODULE_LICENSE("GPL");