drivers/regulator/tps6286x-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright Axis Communications AB
   3
   4 #include <linux/err.h>
   5 #include <linux/i2c.h>
   6 #include <linux/module.h>
   7 #include <linux/of.h>
   8 #include <linux/regmap.h>
   9 #include <linux/regulator/of_regulator.h>
  10 #include <linux/regulator/machine.h>
  11 #include <linux/regulator/driver.h>
  12
  13 #include <dt-bindings/regulator/ti,tps62864.h>
  14
  15 #define TPS6286X_VOUT1          0x01
  16 #define TPS6286X_VOUT1_VO1_SET  GENMASK(7, 0)
  17
  18 #define TPS6286X_CONTROL        0x03
  19 #define TPS6286X_CONTROL_FPWM   BIT(4)
  20 #define TPS6286X_CONTROL_SWEN   BIT(5)
  21
  22 #define TPS6286X_MIN_MV         400
  23 #define TPS6286X_MAX_MV         1675
  24 #define TPS6286X_STEP_MV        5
  25
  26 static const struct regmap_config tps6286x_regmap_config = {
  27         .reg_bits = 8,
  28         .val_bits = 8,
  29 };
  30
  31 static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
  32 {
  33         unsigned int val;
  34
  35         switch (mode) {
  36         case REGULATOR_MODE_NORMAL:
  37                 val = 0;
  38                 break;
  39         case REGULATOR_MODE_FAST:
  40                 val = TPS6286X_CONTROL_FPWM;
  41                 break;
  42         default:
  43                 return -EINVAL;
  44         }
  45
  46         return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
  47                                   TPS6286X_CONTROL_FPWM, val);
  48 }
  49
  50 static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
  51 {
  52         unsigned int val;
  53         int ret;
  54
  55         ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
  56         if (ret < 0)
  57                 return 0;
  58
  59         return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
  60 }
  61
  62 static const struct regulator_ops tps6286x_regulator_ops = {
  63         .enable = regulator_enable_regmap,
  64         .disable = regulator_disable_regmap,
  65         .set_mode = tps6286x_set_mode,
  66         .get_mode = tps6286x_get_mode,
  67         .is_enabled = regulator_is_enabled_regmap,
  68         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  69         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  70         .list_voltage = regulator_list_voltage_linear,
  71 };
  72
  73 static unsigned int tps6286x_of_map_mode(unsigned int mode)
  74 {
  75         switch (mode) {
  76         case TPS62864_MODE_NORMAL:
  77                 return REGULATOR_MODE_NORMAL;
  78         case TPS62864_MODE_FPWM:
  79                 return REGULATOR_MODE_FAST;
  80         default:
  81                 return REGULATOR_MODE_INVALID;
  82         }
  83 }
  84
  85 static const struct regulator_desc tps6286x_reg = {
  86         .name = "tps6286x",
  87         .of_match = "SW",
  88         .owner = THIS_MODULE,
  89         .ops = &tps6286x_regulator_ops,
  90         .of_map_mode = tps6286x_of_map_mode,
  91         .regulators_node = "regulators",
  92         .type = REGULATOR_VOLTAGE,
  93         .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
  94         .min_uV = TPS6286X_MIN_MV * 1000,
  95         .uV_step = TPS6286X_STEP_MV * 1000,
  96         .vsel_reg = TPS6286X_VOUT1,
  97         .vsel_mask = TPS6286X_VOUT1_VO1_SET,
  98         .enable_reg = TPS6286X_CONTROL,
  99         .enable_mask = TPS6286X_CONTROL_SWEN,
 100         .ramp_delay = 1000,
 101         /* tDelay + tRamp, rounded up */
 102         .enable_time = 3000,
 103 };
 104
 105 static const struct of_device_id tps6286x_dt_ids[] = {
 106         { .compatible = "ti,tps62864", },
 107         { .compatible = "ti,tps62866", },
 108         { .compatible = "ti,tps62868", },
 109         { .compatible = "ti,tps62869", },
 110         { }
 111 };
 112 MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
 113
 114 static int tps6286x_i2c_probe(struct i2c_client *i2c)
 115 {
 116         struct device *dev = &i2c->dev;
 117         struct regulator_config config = {};
 118         struct regulator_dev *rdev;
 119         struct regmap *regmap;
 120
 121         regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
 122         if (IS_ERR(regmap))
 123                 return PTR_ERR(regmap);
 124
 125         config.dev = &i2c->dev;
 126         config.of_node = dev->of_node;
 127         config.regmap = regmap;
 128
 129         rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
 130         if (IS_ERR(rdev)) {
 131                 dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
 132                 return PTR_ERR(rdev);
 133         }
 134
 135         return 0;
 136 }
 137
 138 static const struct i2c_device_id tps6286x_i2c_id[] = {
 139         { "tps62864" },
 140         { "tps62866" },
 141         { "tps62868" },
 142         { "tps62869" },
 143         {}
 144 };
 145 MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
 146
 147 static struct i2c_driver tps6286x_regulator_driver = {
 148         .driver = {
 149                 .name = "tps6286x",
 150                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 151                 .of_match_table = tps6286x_dt_ids,
 152         },
 153         .probe = tps6286x_i2c_probe,
 154         .id_table = tps6286x_i2c_id,
 155 };
 156
 157 module_i2c_driver(tps6286x_regulator_driver);
 158
 159 MODULE_DESCRIPTION("TI TPS6286x Power Regulator driver");
 160 MODULE_LICENSE("GPL v2");