drivers/regulator/max77503-regulator.c

   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");