// SPDX-License-Identifier: GPL-2.0+ // // mpq7920.c - regulator driver for mps mpq7920 // // Copyright 2019 Monolithic Power Systems, Inc // // Author: Saravanan Sekar #include #include #include #include #include #include #include #include #include #include #include #include "mpq7920.h" #define MPQ7920_BUCK_VOLT_RANGE \ ((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) #define MPQ7920_LDO_VOLT_RANGE \ ((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) #define MPQ7920BUCK(_name, _id, _ilim) \ [MPQ7920_BUCK ## _id] = { \ .id = MPQ7920_BUCK ## _id, \ .name = _name, \ .of_match = _name, \ .regulators_node = "regulators", \ .of_parse_cb = mpq7920_parse_cb, \ .ops = &mpq7920_buck_ops, \ .min_uV = MPQ7920_BUCK_VOLT_MIN, \ .uV_step = MPQ7920_VOLT_STEP, \ .n_voltages = MPQ7920_BUCK_VOLT_RANGE, \ .curr_table = _ilim, \ .n_current_limits = ARRAY_SIZE(_ilim), \ .csel_reg = MPQ7920_BUCK ##_id## _REG_C, \ .csel_mask = MPQ7920_MASK_BUCK_ILIM, \ .enable_reg = MPQ7920_REG_REGULATOR_EN, \ .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ MPQ7920_BUCK ## _id), \ .vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \ .vsel_mask = MPQ7920_MASK_VREF, \ .active_discharge_on = MPQ7920_DISCHARGE_ON, \ .active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \ .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ .soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \ .soft_start_mask = MPQ7920_MASK_SOFTSTART, \ .owner = THIS_MODULE, \ } #define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \ [MPQ7920_LDO ## _id] = { \ .id = MPQ7920_LDO ## _id, \ .name = _name, \ .of_match = _name, \ .regulators_node = "regulators", \ .ops = _ops, \ .min_uV = MPQ7920_LDO_VOLT_MIN, \ .uV_step = MPQ7920_VOLT_STEP, \ .n_voltages = MPQ7920_LDO_VOLT_RANGE, \ .vsel_reg = MPQ7920_LDO ##_id## _REG_A, \ .vsel_mask = MPQ7920_MASK_VREF, \ .curr_table = _ilim, \ .n_current_limits = _ilim_sz, \ .csel_reg = _creg, \ .csel_mask = _cmask, \ .enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\ .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ MPQ7920_LDO ##_id + 1), \ .active_discharge_on = MPQ7920_DISCHARGE_ON, \ .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ .active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \ .type = REGULATOR_VOLTAGE, \ .owner = THIS_MODULE, \ } enum mpq7920_regulators { MPQ7920_BUCK1, MPQ7920_BUCK2, MPQ7920_BUCK3, MPQ7920_BUCK4, MPQ7920_LDO1, /* LDORTC */ MPQ7920_LDO2, MPQ7920_LDO3, MPQ7920_LDO4, MPQ7920_LDO5, MPQ7920_MAX_REGULATORS, }; struct mpq7920_regulator_info { struct device *dev; struct regmap *regmap; struct regulator_dev *rdev[MPQ7920_MAX_REGULATORS]; struct regulator_desc *rdesc; }; static const struct regmap_config mpq7920_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = 0x25, }; /* Current limits array (in uA) * ILIM1 & ILIM3 */ static const unsigned int mpq7920_I_limits1[] = { 4600000, 6600000, 7600000, 9300000 }; /* ILIM2 & ILIM4 */ static const unsigned int mpq7920_I_limits2[] = { 2700000, 3900000, 5100000, 6100000 }; /* LDO4 & LDO5 */ static const unsigned int mpq7920_I_limits3[] = { 300000, 700000 }; static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay); static int mpq7920_parse_cb(struct device_node *np, const struct regulator_desc *rdesc, struct regulator_config *config); /* RTCLDO not controllable, always ON */ static const struct regulator_ops mpq7920_ldortc_ops = { .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, }; static const struct regulator_ops mpq7920_ldo_wo_current_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_ops mpq7920_ldo_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, .get_current_limit = regulator_get_current_limit_regmap, .set_current_limit = regulator_set_current_limit_regmap, }; static const struct regulator_ops mpq7920_buck_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, .set_soft_start = regulator_set_soft_start_regmap, .set_ramp_delay = mpq7920_set_ramp_delay, }; static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = { MPQ7920BUCK("buck1", 1, mpq7920_I_limits1), MPQ7920BUCK("buck2", 2, mpq7920_I_limits2), MPQ7920BUCK("buck3", 3, mpq7920_I_limits1), MPQ7920BUCK("buck4", 4, mpq7920_I_limits2), MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0), MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3, ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B, MPQ7920_MASK_LDO_ILIM), MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3, ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B, MPQ7920_MASK_LDO_ILIM), }; /* * DVS ramp rate BUCK1 to BUCK4 * 00-01: Reserved * 10: 8mV/us * 11: 4mV/us */ static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) { unsigned int ramp_val; if (ramp_delay > 8000 || ramp_delay < 0) return -EINVAL; if (ramp_delay <= 4000) ramp_val = 3; else ramp_val = 2; return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0, MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6); } static int mpq7920_parse_cb(struct device_node *np, const struct regulator_desc *desc, struct regulator_config *config) { uint8_t val; int ret; struct mpq7920_regulator_info *info = config->driver_data; struct regulator_desc *rdesc = &info->rdesc[desc->id]; if (of_property_read_bool(np, "mps,buck-ovp-disable")) { regmap_update_bits(config->regmap, MPQ7920_BUCK1_REG_B + (rdesc->id * 4), BIT(6), ~BIT(6)); } ret = of_property_read_u8(np, "mps,buck-phase-delay", &val); if (!ret) { regmap_update_bits(config->regmap, MPQ7920_BUCK1_REG_C + (rdesc->id * 4), MPQ7920_MASK_BUCK_PHASE_DEALY, (val & 3) << 4); } ret = of_property_read_u8(np, "mps,buck-softstart", &val); if (!ret) rdesc->soft_start_val_on = (val & 3) << 2; return 0; } static void mpq7920_parse_dt(struct device *dev, struct mpq7920_regulator_info *info) { int ret; struct device_node *np = dev->of_node; uint8_t freq; np = of_get_child_by_name(np, "regulators"); if (!np) { dev_err(dev, "missing 'regulators' subnode in DT\n"); return; } ret = of_property_read_u8(np, "mps,switch-freq", &freq); if (!ret) { regmap_update_bits(info->regmap, MPQ7920_REG_CTL0, MPQ7920_MASK_SWITCH_FREQ, (freq & 3) << 4); } of_node_put(np); } static inline int mpq7920_regulator_register( struct mpq7920_regulator_info *info, struct regulator_config *config) { int i; struct regulator_desc *rdesc; for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) { rdesc = &info->rdesc[i]; info->rdev[i] = devm_regulator_register(info->dev, rdesc, config); if (IS_ERR(info->rdev)) return PTR_ERR(info->rdev); } return 0; } static int mpq7920_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct mpq7920_regulator_info *info; struct regulator_config config = { NULL, }; struct regmap *regmap; int ret; info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info), GFP_KERNEL); if (!info) return -ENOMEM; info->dev = dev; info->rdesc = mpq7920_regulators_desc; regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config); if (IS_ERR(regmap)) { dev_err(dev, "Failed to allocate regmap!\n"); return PTR_ERR(regmap); } i2c_set_clientdata(client, info); info->regmap = regmap; if (client->dev.of_node) mpq7920_parse_dt(&client->dev, info); config.dev = info->dev; config.regmap = regmap; config.driver_data = info; ret = mpq7920_regulator_register(info, &config); if (ret < 0) dev_err(dev, "Failed to register regulator!\n"); return ret; } static const struct of_device_id mpq7920_of_match[] = { { .compatible = "mps,mpq7920"}, {}, }; MODULE_DEVICE_TABLE(of, mpq7920_of_match); static const struct i2c_device_id mpq7920_id[] = { { "mpq7920", }, { }, }; MODULE_DEVICE_TABLE(i2c, mpq7920_id); static struct i2c_driver mpq7920_regulator_driver = { .driver = { .name = "mpq7920", .of_match_table = of_match_ptr(mpq7920_of_match), }, .probe = mpq7920_i2c_probe, .id_table = mpq7920_id, }; module_i2c_driver(mpq7920_regulator_driver); MODULE_AUTHOR("Saravanan Sekar "); MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver"); MODULE_LICENSE("GPL");