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 struct max77503_dev { 29 struct device *dev; 30 struct device_node *of_node; 31 struct regulator_desc desc; 32 struct regulator_dev *rdev; 33 struct regmap *regmap; 34 }; 35 36 static const struct regmap_config max77503_regmap_config = { 37 .reg_bits = 8, 38 .val_bits = 8, 39 .max_register = 0x2, 40 }; 41 42 static const struct regulator_ops max77503_buck_ops = { 43 .list_voltage = regulator_list_voltage_linear_range, 44 .map_voltage = regulator_map_voltage_ascend, 45 .is_enabled = regulator_is_enabled_regmap, 46 .enable = regulator_enable_regmap, 47 .disable = regulator_disable_regmap, 48 .get_voltage_sel = regulator_get_voltage_sel_regmap, 49 .set_voltage_sel = regulator_set_voltage_sel_regmap, 50 .get_current_limit = regulator_get_current_limit_regmap, 51 .set_current_limit = regulator_set_current_limit_regmap, 52 .set_active_discharge = regulator_set_active_discharge_regmap, 53 .set_soft_start = regulator_set_soft_start_regmap, 54 }; 55 56 static const struct linear_range max77503_buck_ranges[] = { 57 REGULATOR_LINEAR_RANGE(800000, 0x00, 0x54, 50000) 58 }; 59 60 static const unsigned int max77503_current_limit_table[] = { 61 500000, 2000000 62 }; 63 64 static const struct regulator_desc max77503_regulators_desc = { 65 .name = "max77503", 66 .enable_reg = MAX77503_REG_CFG, 67 .enable_mask = MAX77503_BIT_EN, 68 .ops = &max77503_buck_ops, 69 .type = REGULATOR_VOLTAGE, 70 .linear_ranges = max77503_buck_ranges, 71 .n_linear_ranges = ARRAY_SIZE(max77503_buck_ranges), 72 .vsel_reg = MAX77503_REG_VOUT, 73 .vsel_mask = MAX77503_BITS_MX_VOUT, 74 .soft_start_reg = MAX77503_REG_CFG, 75 .soft_start_mask = MAX77503_BITS_SOFT_START, 76 .active_discharge_reg = MAX77503_REG_CFG, 77 .active_discharge_mask = MAX77503_BIT_ADEN, 78 .active_discharge_off = MAX77503_AD_DISABLED, 79 .active_discharge_on = MAX77503_AD_ENABLED, 80 .csel_reg = MAX77503_REG_CFG, 81 .csel_mask = MAX77503_BIT_CURR_LIM, 82 .curr_table = max77503_current_limit_table, 83 .n_current_limits = ARRAY_SIZE(max77503_current_limit_table), 84 .owner = THIS_MODULE, 85 }; 86 87 static int max77503_regulator_probe(struct i2c_client *client) 88 { 89 struct device *dev = &client->dev; 90 struct regulator_config config = {}; 91 struct regulator_dev *rdev; 92 93 config.dev = dev; 94 config.of_node = dev->of_node; 95 config.regmap = devm_regmap_init_i2c(client, &max77503_regmap_config); 96 if (IS_ERR(config.regmap)) { 97 dev_err(dev, "Failed to init regmap"); 98 return PTR_ERR(config.regmap); 99 } 100 101 rdev = devm_regulator_register(dev, &max77503_regulators_desc, &config); 102 if (IS_ERR(rdev)) { 103 dev_err(dev, "Failed to register regulator MAX77503"); 104 return PTR_ERR(rdev); 105 } 106 107 return 0; 108 } 109 110 static const struct of_device_id of_max77503_match_tbl[] = { 111 { .compatible = "adi,max77503", }, 112 { } 113 }; 114 115 MODULE_DEVICE_TABLE(of, of_max77503_match_tbl); 116 117 static const struct i2c_device_id max77503_regulator_id[] = { 118 {"max77503"}, 119 { } 120 }; 121 122 MODULE_DEVICE_TABLE(i2c, max77503_regulator_id); 123 124 static struct i2c_driver max77503_regulator_driver = { 125 .driver = { 126 .name = "max77503", 127 .of_match_table = of_max77503_match_tbl 128 }, 129 .probe = max77503_regulator_probe, 130 .id_table = max77503_regulator_id, 131 }; 132 133 module_i2c_driver(max77503_regulator_driver); 134 135 MODULE_AUTHOR("Gokhan Celik <Gokhan.Celik@analog.com>"); 136 MODULE_DESCRIPTION("MAX77503 regulator driver"); 137 MODULE_LICENSE("GPL"); 138