1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2023 Analog Devices, Inc. 4 * ADI regulator driver for MAX77503. 5 */ 6 7 #include <linux/i2c.h> 8 #include <linux/module.h> 9 #include <linux/regmap.h> 10 #include <linux/regulator/driver.h> 11 #include <linux/regulator/machine.h> 12 #include <linux/regulator/of_regulator.h> 13 #include <linux/util_macros.h> 14 15 #define MAX77503_REG_CFG 0x00 16 #define MAX77503_REG_VOUT 0x01 17 18 #define MAX77503_BIT_EN BIT(0) 19 #define MAX77503_BIT_CURR_LIM BIT(3) 20 #define MAX77503_BIT_ADEN BIT(6) 21 22 #define MAX77503_BITS_SOFT_START GENMASK(5, 4) 23 #define MAX77503_BITS_MX_VOUT GENMASK(7, 0) 24 25 #define MAX77503_AD_ENABLED 0x1 26 #define MAX77503_AD_DISABLED 0x0 27 28 static const struct regmap_config max77503_regmap_config = { 29 .reg_bits = 8, 30 .val_bits = 8, 31 .max_register = 0x2, 32 }; 33 34 static const struct regulator_ops max77503_buck_ops = { 35 .list_voltage = regulator_list_voltage_linear_range, 36 .map_voltage = regulator_map_voltage_ascend, 37 .is_enabled = regulator_is_enabled_regmap, 38 .enable = regulator_enable_regmap, 39 .disable = regulator_disable_regmap, 40 .get_voltage_sel = regulator_get_voltage_sel_regmap, 41 .set_voltage_sel = regulator_set_voltage_sel_regmap, 42 .get_current_limit = regulator_get_current_limit_regmap, 43 .set_current_limit = regulator_set_current_limit_regmap, 44 .set_active_discharge = regulator_set_active_discharge_regmap, 45 .set_soft_start = regulator_set_soft_start_regmap, 46 }; 47 48 static const struct linear_range max77503_buck_ranges[] = { 49 REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000) 50 }; 51 52 static const unsigned int max77503_current_limit_table[] = { 53 500000, 2000000 54 }; 55 56 static const struct regulator_desc max77503_regulators_desc = { 57 .name = "max77503", 58 .enable_reg = MAX77503_REG_CFG, 59 .enable_mask = MAX77503_BIT_EN, 60 .ops = &max77503_buck_ops, 61 .type = REGULATOR_VOLTAGE, 62 .linear_ranges = max77503_buck_ranges, 63 .n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges), 64 .vsel_reg = MAX77503_REG_VOUT, 65 .vsel_mask = MAX77503_BITS_MX_VOUT, 66 .soft_start_reg = MAX77503_REG_CFG, 67 .soft_start_mask = MAX77503_BITS_SOFT_START, 68 .active_discharge_reg = MAX77503_REG_CFG, 69 .active_discharge_mask = MAX77503_BIT_ADEN, 70 .active_discharge_off = MAX77503_AD_DISABLED, 71 .active_discharge_on = MAX77503_AD_ENABLED, 72 .csel_reg = MAX77503_REG_CFG, 73 .csel_mask = MAX77503_BIT_CURR_LIM, 74 .curr_table = max77503_current_limit_table, 75 .n_current_limits = ARRAY_SIZE(max77503_current_limit_table), 76 .owner = THIS_MODULE, 77 }; 78 79 static int max77503_regulator_probe(struct i2c_client *client) 80 { 81 struct device *dev = &client->dev; 82 struct regulator_config config = {}; 83 struct regulator_dev *rdev; 84 85 config.dev = dev; 86 config.of_node = dev->of_node; 87 config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config); 88 if (IS_ERR(config.regmap)) { 89 dev_err(dev, "Failed to init regmap"); 90 return PTR_ERR(config.regmap); 91 } 92 93 rdev = devm_regulator_register(dev, &max77503_regulators_desc, &config); 94 if (IS_ERR(rdev)) { 95 dev_err(dev, "Failed to register regulator MAX77503"); 96 return PTR_ERR(rdev); 97 } 98 99 return 0; 100 } 101 102 static const struct of_device_id of_max77503_match_tbl[] = { 103 { .compatible = "adi,max77503", }, 104 { } 105 }; 106 107 MODULE_DEVICE_TABLE(of, of_max77503_match_tbl); 108 109 static const struct i2c_device_id max77503_regulator_id[] = { 110 {"max77503"}, 111 { } 112 }; 113 114 MODULE_DEVICE_TABLE(i2c, max77503_regulator_id); 115 116 static struct i2c_driver max77503_regulator_driver = { 117 .driver = { 118 .name = "max77503", 119 .of_match_table = of_max77503_match_tbl 120 }, 121 .probe = max77503_regulator_probe, 122 .id_table = max77503_regulator_id, 123 }; 124 125 module_i2c_driver(max77503_regulator_driver); 126 127 MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@analog.com>"); 128 MODULE_DESCRIPTION("MAX77503 regulator driver"); 129 MODULE_LICENSE("GPL"); 130