138fc6f29SJisheng Zhang // SPDX-License-Identifier: GPL-2.0 238fc6f29SJisheng Zhang // 338fc6f29SJisheng Zhang // SY8827N regulator driver 438fc6f29SJisheng Zhang // 538fc6f29SJisheng Zhang // Copyright (C) 2020 Synaptics Incorporated 638fc6f29SJisheng Zhang // 738fc6f29SJisheng Zhang // Author: Jisheng Zhang <jszhang@kernel.org> 838fc6f29SJisheng Zhang 938fc6f29SJisheng Zhang #include <linux/gpio/consumer.h> 1038fc6f29SJisheng Zhang #include <linux/module.h> 1138fc6f29SJisheng Zhang #include <linux/i2c.h> 1238fc6f29SJisheng Zhang #include <linux/of_device.h> 1338fc6f29SJisheng Zhang #include <linux/regmap.h> 1438fc6f29SJisheng Zhang #include <linux/regulator/driver.h> 1538fc6f29SJisheng Zhang #include <linux/regulator/of_regulator.h> 1638fc6f29SJisheng Zhang 1738fc6f29SJisheng Zhang #define SY8827N_VSEL0 0 1838fc6f29SJisheng Zhang #define SY8827N_BUCK_EN (1 << 7) 1938fc6f29SJisheng Zhang #define SY8827N_MODE (1 << 6) 2038fc6f29SJisheng Zhang #define SY8827N_VSEL1 1 2138fc6f29SJisheng Zhang #define SY8827N_CTRL 2 226bdd1c67SJisheng Zhang #define SY8827N_ID1 3 236bdd1c67SJisheng Zhang #define SY8827N_ID2 4 246bdd1c67SJisheng Zhang #define SY8827N_PGOOD 5 256bdd1c67SJisheng Zhang #define SY8827N_MAX (SY8827N_PGOOD + 1) 2638fc6f29SJisheng Zhang 2738fc6f29SJisheng Zhang #define SY8827N_NVOLTAGES 64 2838fc6f29SJisheng Zhang #define SY8827N_VSELMIN 600000 2938fc6f29SJisheng Zhang #define SY8827N_VSELSTEP 12500 3038fc6f29SJisheng Zhang 3138fc6f29SJisheng Zhang struct sy8827n_device_info { 3238fc6f29SJisheng Zhang struct device *dev; 3338fc6f29SJisheng Zhang struct regulator_desc desc; 3438fc6f29SJisheng Zhang struct regulator_init_data *regulator; 3538fc6f29SJisheng Zhang struct gpio_desc *en_gpio; 3638fc6f29SJisheng Zhang unsigned int vsel_reg; 3738fc6f29SJisheng Zhang }; 3838fc6f29SJisheng Zhang 3938fc6f29SJisheng Zhang static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode) 4038fc6f29SJisheng Zhang { 4138fc6f29SJisheng Zhang struct sy8827n_device_info *di = rdev_get_drvdata(rdev); 4238fc6f29SJisheng Zhang 4338fc6f29SJisheng Zhang switch (mode) { 4438fc6f29SJisheng Zhang case REGULATOR_MODE_FAST: 4538fc6f29SJisheng Zhang regmap_update_bits(rdev->regmap, di->vsel_reg, 4638fc6f29SJisheng Zhang SY8827N_MODE, SY8827N_MODE); 4738fc6f29SJisheng Zhang break; 4838fc6f29SJisheng Zhang case REGULATOR_MODE_NORMAL: 4938fc6f29SJisheng Zhang regmap_update_bits(rdev->regmap, di->vsel_reg, 5038fc6f29SJisheng Zhang SY8827N_MODE, 0); 5138fc6f29SJisheng Zhang break; 5238fc6f29SJisheng Zhang default: 5338fc6f29SJisheng Zhang return -EINVAL; 5438fc6f29SJisheng Zhang } 5538fc6f29SJisheng Zhang return 0; 5638fc6f29SJisheng Zhang } 5738fc6f29SJisheng Zhang 5838fc6f29SJisheng Zhang static unsigned int sy8827n_get_mode(struct regulator_dev *rdev) 5938fc6f29SJisheng Zhang { 6038fc6f29SJisheng Zhang struct sy8827n_device_info *di = rdev_get_drvdata(rdev); 6138fc6f29SJisheng Zhang u32 val; 6238fc6f29SJisheng Zhang int ret = 0; 6338fc6f29SJisheng Zhang 6438fc6f29SJisheng Zhang ret = regmap_read(rdev->regmap, di->vsel_reg, &val); 6538fc6f29SJisheng Zhang if (ret < 0) 6638fc6f29SJisheng Zhang return ret; 6738fc6f29SJisheng Zhang if (val & SY8827N_MODE) 6838fc6f29SJisheng Zhang return REGULATOR_MODE_FAST; 6938fc6f29SJisheng Zhang else 7038fc6f29SJisheng Zhang return REGULATOR_MODE_NORMAL; 7138fc6f29SJisheng Zhang } 7238fc6f29SJisheng Zhang 7338fc6f29SJisheng Zhang static const struct regulator_ops sy8827n_regulator_ops = { 7438fc6f29SJisheng Zhang .set_voltage_sel = regulator_set_voltage_sel_regmap, 7538fc6f29SJisheng Zhang .get_voltage_sel = regulator_get_voltage_sel_regmap, 7638fc6f29SJisheng Zhang .set_voltage_time_sel = regulator_set_voltage_time_sel, 7738fc6f29SJisheng Zhang .map_voltage = regulator_map_voltage_linear, 7838fc6f29SJisheng Zhang .list_voltage = regulator_list_voltage_linear, 7938fc6f29SJisheng Zhang .enable = regulator_enable_regmap, 8038fc6f29SJisheng Zhang .disable = regulator_disable_regmap, 8138fc6f29SJisheng Zhang .is_enabled = regulator_is_enabled_regmap, 8238fc6f29SJisheng Zhang .set_mode = sy8827n_set_mode, 8338fc6f29SJisheng Zhang .get_mode = sy8827n_get_mode, 8438fc6f29SJisheng Zhang }; 8538fc6f29SJisheng Zhang 8638fc6f29SJisheng Zhang static int sy8827n_regulator_register(struct sy8827n_device_info *di, 8738fc6f29SJisheng Zhang struct regulator_config *config) 8838fc6f29SJisheng Zhang { 8938fc6f29SJisheng Zhang struct regulator_desc *rdesc = &di->desc; 9038fc6f29SJisheng Zhang struct regulator_dev *rdev; 9138fc6f29SJisheng Zhang 9238fc6f29SJisheng Zhang rdesc->name = "sy8827n-reg"; 9338fc6f29SJisheng Zhang rdesc->supply_name = "vin"; 9438fc6f29SJisheng Zhang rdesc->ops = &sy8827n_regulator_ops; 9538fc6f29SJisheng Zhang rdesc->type = REGULATOR_VOLTAGE; 9638fc6f29SJisheng Zhang rdesc->n_voltages = SY8827N_NVOLTAGES; 9738fc6f29SJisheng Zhang rdesc->enable_reg = di->vsel_reg; 9838fc6f29SJisheng Zhang rdesc->enable_mask = SY8827N_BUCK_EN; 9938fc6f29SJisheng Zhang rdesc->min_uV = SY8827N_VSELMIN; 10038fc6f29SJisheng Zhang rdesc->uV_step = SY8827N_VSELSTEP; 10138fc6f29SJisheng Zhang rdesc->vsel_reg = di->vsel_reg; 10238fc6f29SJisheng Zhang rdesc->vsel_mask = rdesc->n_voltages - 1; 10338fc6f29SJisheng Zhang rdesc->owner = THIS_MODULE; 10438fc6f29SJisheng Zhang 10538fc6f29SJisheng Zhang rdev = devm_regulator_register(di->dev, &di->desc, config); 10638fc6f29SJisheng Zhang return PTR_ERR_OR_ZERO(rdev); 10738fc6f29SJisheng Zhang } 10838fc6f29SJisheng Zhang 1096bdd1c67SJisheng Zhang static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg) 1106bdd1c67SJisheng Zhang { 1116bdd1c67SJisheng Zhang if (reg == SY8827N_PGOOD) 1126bdd1c67SJisheng Zhang return true; 1136bdd1c67SJisheng Zhang return false; 1146bdd1c67SJisheng Zhang } 1156bdd1c67SJisheng Zhang 11638fc6f29SJisheng Zhang static const struct regmap_config sy8827n_regmap_config = { 11738fc6f29SJisheng Zhang .reg_bits = 8, 11838fc6f29SJisheng Zhang .val_bits = 8, 1196bdd1c67SJisheng Zhang .volatile_reg = sy8827n_volatile_reg, 1206bdd1c67SJisheng Zhang .num_reg_defaults_raw = SY8827N_MAX, 1216bdd1c67SJisheng Zhang .cache_type = REGCACHE_FLAT, 12238fc6f29SJisheng Zhang }; 12338fc6f29SJisheng Zhang 12438fc6f29SJisheng Zhang static int sy8827n_i2c_probe(struct i2c_client *client) 12538fc6f29SJisheng Zhang { 12638fc6f29SJisheng Zhang struct device *dev = &client->dev; 12738fc6f29SJisheng Zhang struct device_node *np = dev->of_node; 12838fc6f29SJisheng Zhang struct sy8827n_device_info *di; 12938fc6f29SJisheng Zhang struct regulator_config config = { }; 13038fc6f29SJisheng Zhang struct regmap *regmap; 13138fc6f29SJisheng Zhang int ret; 13238fc6f29SJisheng Zhang 13338fc6f29SJisheng Zhang di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL); 13438fc6f29SJisheng Zhang if (!di) 13538fc6f29SJisheng Zhang return -ENOMEM; 13638fc6f29SJisheng Zhang 13738fc6f29SJisheng Zhang di->regulator = of_get_regulator_init_data(dev, np, &di->desc); 13838fc6f29SJisheng Zhang if (!di->regulator) { 13938fc6f29SJisheng Zhang dev_err(dev, "Platform data not found!\n"); 14038fc6f29SJisheng Zhang return -EINVAL; 14138fc6f29SJisheng Zhang } 14238fc6f29SJisheng Zhang 14338fc6f29SJisheng Zhang di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); 14438fc6f29SJisheng Zhang if (IS_ERR(di->en_gpio)) 14538fc6f29SJisheng Zhang return PTR_ERR(di->en_gpio); 14638fc6f29SJisheng Zhang 14738fc6f29SJisheng Zhang if (of_property_read_bool(np, "silergy,vsel-state-high")) 14838fc6f29SJisheng Zhang di->vsel_reg = SY8827N_VSEL1; 14938fc6f29SJisheng Zhang else 15038fc6f29SJisheng Zhang di->vsel_reg = SY8827N_VSEL0; 15138fc6f29SJisheng Zhang 15238fc6f29SJisheng Zhang di->dev = dev; 15338fc6f29SJisheng Zhang 15438fc6f29SJisheng Zhang regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config); 15538fc6f29SJisheng Zhang if (IS_ERR(regmap)) { 15638fc6f29SJisheng Zhang dev_err(dev, "Failed to allocate regmap!\n"); 15738fc6f29SJisheng Zhang return PTR_ERR(regmap); 15838fc6f29SJisheng Zhang } 15938fc6f29SJisheng Zhang i2c_set_clientdata(client, di); 16038fc6f29SJisheng Zhang 16138fc6f29SJisheng Zhang config.dev = di->dev; 16238fc6f29SJisheng Zhang config.init_data = di->regulator; 16338fc6f29SJisheng Zhang config.regmap = regmap; 16438fc6f29SJisheng Zhang config.driver_data = di; 16538fc6f29SJisheng Zhang config.of_node = np; 16638fc6f29SJisheng Zhang 16738fc6f29SJisheng Zhang ret = sy8827n_regulator_register(di, &config); 16838fc6f29SJisheng Zhang if (ret < 0) 16938fc6f29SJisheng Zhang dev_err(dev, "Failed to register regulator!\n"); 17038fc6f29SJisheng Zhang return ret; 17138fc6f29SJisheng Zhang } 17238fc6f29SJisheng Zhang 17338fc6f29SJisheng Zhang static const struct of_device_id sy8827n_dt_ids[] = { 17438fc6f29SJisheng Zhang { 17538fc6f29SJisheng Zhang .compatible = "silergy,sy8827n", 17638fc6f29SJisheng Zhang }, 17738fc6f29SJisheng Zhang { } 17838fc6f29SJisheng Zhang }; 17938fc6f29SJisheng Zhang MODULE_DEVICE_TABLE(of, sy8827n_dt_ids); 18038fc6f29SJisheng Zhang 18138fc6f29SJisheng Zhang static const struct i2c_device_id sy8827n_id[] = { 18238fc6f29SJisheng Zhang { "sy8827n", }, 18338fc6f29SJisheng Zhang { }, 18438fc6f29SJisheng Zhang }; 18538fc6f29SJisheng Zhang MODULE_DEVICE_TABLE(i2c, sy8827n_id); 18638fc6f29SJisheng Zhang 18738fc6f29SJisheng Zhang static struct i2c_driver sy8827n_regulator_driver = { 18838fc6f29SJisheng Zhang .driver = { 18938fc6f29SJisheng Zhang .name = "sy8827n-regulator", 190*67dc71c6SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS, 191c4b02c92SJean Delvare .of_match_table = sy8827n_dt_ids, 19238fc6f29SJisheng Zhang }, 19338fc6f29SJisheng Zhang .probe_new = sy8827n_i2c_probe, 19438fc6f29SJisheng Zhang .id_table = sy8827n_id, 19538fc6f29SJisheng Zhang }; 19638fc6f29SJisheng Zhang module_i2c_driver(sy8827n_regulator_driver); 19738fc6f29SJisheng Zhang 19838fc6f29SJisheng Zhang MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); 19938fc6f29SJisheng Zhang MODULE_DESCRIPTION("SY8827N regulator driver"); 20038fc6f29SJisheng Zhang MODULE_LICENSE("GPL v2"); 201