drivers/regulator/mp5416.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // mp5416.c  - regulator driver for mps mp5416
   4 //
   5 // Copyright 2020 Monolithic Power Systems, Inc
   6 //
   7 // Author: Saravanan Sekar <sravanhome@gmail.com>
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/err.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/i2c.h>
  17
  18 #define MP5416_REG_CTL0                 0x00
  19 #define MP5416_REG_CTL1                 0x01
  20 #define MP5416_REG_CTL2                 0x02
  21 #define MP5416_REG_ILIM                 0x03
  22 #define MP5416_REG_BUCK1                0x04
  23 #define MP5416_REG_BUCK2                0x05
  24 #define MP5416_REG_BUCK3                0x06
  25 #define MP5416_REG_BUCK4                0x07
  26 #define MP5416_REG_LDO1                 0x08
  27 #define MP5416_REG_LDO2                 0x09
  28 #define MP5416_REG_LDO3                 0x0a
  29 #define MP5416_REG_LDO4                 0x0b
  30
  31 #define MP5416_REGULATOR_EN             BIT(7)
  32 #define MP5416_MASK_VSET                0x7f
  33 #define MP5416_MASK_BUCK1_ILIM          0xc0
  34 #define MP5416_MASK_BUCK2_ILIM          0x0c
  35 #define MP5416_MASK_BUCK3_ILIM          0x30
  36 #define MP5416_MASK_BUCK4_ILIM          0x03
  37 #define MP5416_MASK_DVS_SLEWRATE        0xc0
  38
  39 /* values in uV */
  40 #define MP5416_VOLT1_MIN                600000
  41 #define MP5416_VOLT1_MAX                2187500
  42 #define MP5416_VOLT1_STEP               12500
  43 #define MP5416_VOLT2_MIN                800000
  44 #define MP5416_VOLT2_MAX                3975000
  45 #define MP5416_VOLT2_STEP               25000
  46
  47 #define MP5416_VOLT1_RANGE \
  48         ((MP5416_VOLT1_MAX - MP5416_VOLT1_MIN)/MP5416_VOLT1_STEP + 1)
  49 #define MP5416_VOLT2_RANGE \
  50         ((MP5416_VOLT2_MAX - MP5416_VOLT2_MIN)/MP5416_VOLT2_STEP + 1)
  51
  52 #define MP5416BUCK(_name, _id, _ilim, _dreg, _dval, _vsel)              \
  53         [MP5416_BUCK ## _id] = {                                        \
  54                 .id = MP5416_BUCK ## _id,                               \
  55                 .name = _name,                                          \
  56                 .of_match = _name,                                      \
  57                 .regulators_node = "regulators",                        \
  58                 .ops = &mp5416_buck_ops,                                \
  59                 .min_uV = MP5416_VOLT ##_vsel## _MIN,                   \
  60                 .uV_step = MP5416_VOLT ##_vsel## _STEP,                 \
  61                 .n_voltages = MP5416_VOLT ##_vsel## _RANGE,             \
  62                 .curr_table = _ilim,                                    \
  63                 .n_current_limits = ARRAY_SIZE(_ilim),                  \
  64                 .csel_reg = MP5416_REG_ILIM,                            \
  65                 .csel_mask = MP5416_MASK_BUCK ## _id ##_ILIM,           \
  66                 .vsel_reg = MP5416_REG_BUCK ## _id,                     \
  67                 .vsel_mask = MP5416_MASK_VSET,                          \
  68                 .enable_reg = MP5416_REG_BUCK ## _id,                   \
  69                 .enable_mask = MP5416_REGULATOR_EN,                     \
  70                 .active_discharge_on    = _dval,                        \
  71                 .active_discharge_reg   = _dreg,                        \
  72                 .active_discharge_mask  = _dval,                        \
  73                 .owner                  = THIS_MODULE,                  \
  74         }
  75
  76 #define MP5416LDO(_name, _id, _dval)                                    \
  77         [MP5416_LDO ## _id] = {                                         \
  78                 .id = MP5416_LDO ## _id,                                \
  79                 .name = _name,                                          \
  80                 .of_match = _name,                                      \
  81                 .regulators_node = "regulators",                        \
  82                 .ops = &mp5416_ldo_ops,                                 \
  83                 .min_uV = MP5416_VOLT2_MIN,                             \
  84                 .uV_step = MP5416_VOLT2_STEP,                           \
  85                 .n_voltages = MP5416_VOLT2_RANGE,                       \
  86                 .vsel_reg = MP5416_REG_LDO ##_id,                       \
  87                 .vsel_mask = MP5416_MASK_VSET,                          \
  88                 .enable_reg = MP5416_REG_LDO ##_id,                     \
  89                 .enable_mask = MP5416_REGULATOR_EN,                     \
  90                 .active_discharge_on    = _dval,                        \
  91                 .active_discharge_reg   = MP5416_REG_CTL2,              \
  92                 .active_discharge_mask  = _dval,                        \
  93                 .owner                  = THIS_MODULE,                  \
  94         }
  95
  96 enum mp5416_regulators {
  97         MP5416_BUCK1,
  98         MP5416_BUCK2,
  99         MP5416_BUCK3,
 100         MP5416_BUCK4,
 101         MP5416_LDO1,
 102         MP5416_LDO2,
 103         MP5416_LDO3,
 104         MP5416_LDO4,
 105         MP5416_MAX_REGULATORS,
 106 };
 107
 108 static const struct regmap_config mp5416_regmap_config = {
 109         .reg_bits = 8,
 110         .val_bits = 8,
 111         .max_register = 0x0d,
 112 };
 113
 114 /* Current limits array (in uA)
 115  * ILIM1 & ILIM3
 116  */
 117 static const unsigned int mp5416_I_limits1[] = {
 118         3800000, 4600000, 5600000, 6800000
 119 };
 120
 121 /* ILIM2 & ILIM4 */
 122 static const unsigned int mp5416_I_limits2[] = {
 123         2200000, 3200000, 4200000, 5200000
 124 };
 125
 126 static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay);
 127
 128 static const struct regulator_ops mp5416_ldo_ops = {
 129         .enable                 = regulator_enable_regmap,
 130         .disable                = regulator_disable_regmap,
 131         .is_enabled             = regulator_is_enabled_regmap,
 132         .list_voltage           = regulator_list_voltage_linear,
 133         .map_voltage            = regulator_map_voltage_linear,
 134         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 135         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 136         .set_active_discharge   = regulator_set_active_discharge_regmap,
 137 };
 138
 139 static const struct regulator_ops mp5416_buck_ops = {
 140         .enable                 = regulator_enable_regmap,
 141         .disable                = regulator_disable_regmap,
 142         .is_enabled             = regulator_is_enabled_regmap,
 143         .list_voltage           = regulator_list_voltage_linear,
 144         .map_voltage            = regulator_map_voltage_linear,
 145         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 146         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 147         .set_active_discharge   = regulator_set_active_discharge_regmap,
 148         .get_current_limit      = regulator_get_current_limit_regmap,
 149         .set_current_limit      = regulator_set_current_limit_regmap,
 150         .set_ramp_delay         = mp5416_set_ramp_delay,
 151 };
 152
 153 static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
 154         MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
 155         MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
 156         MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
 157         MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
 158         MP5416LDO("ldo1", 1, BIT(4)),
 159         MP5416LDO("ldo2", 2, BIT(3)),
 160         MP5416LDO("ldo3", 3, BIT(2)),
 161         MP5416LDO("ldo4", 4, BIT(1)),
 162 };
 163
 164 /*
 165  * DVS ramp rate BUCK1 to BUCK4
 166  * 00: 32mV/us
 167  * 01: 16mV/us
 168  * 10: 8mV/us
 169  * 11: 4mV/us
 170  */
 171 static int mp5416_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
 172 {
 173         unsigned int ramp_val;
 174
 175         if (ramp_delay > 32000 || ramp_delay < 0)
 176                 return -EINVAL;
 177
 178         if (ramp_delay <= 4000)
 179                 ramp_val = 3;
 180         else if (ramp_delay <= 8000)
 181                 ramp_val = 2;
 182         else if (ramp_delay <= 16000)
 183                 ramp_val = 1;
 184         else
 185                 ramp_val = 0;
 186
 187         return regmap_update_bits(rdev->regmap, MP5416_REG_CTL2,
 188                                   MP5416_MASK_DVS_SLEWRATE, ramp_val << 6);
 189 }
 190
 191 static int mp5416_i2c_probe(struct i2c_client *client)
 192 {
 193         struct device *dev = &client->dev;
 194         struct regulator_config config = { NULL, };
 195         struct regulator_dev *rdev;
 196         struct regmap *regmap;
 197         int i;
 198
 199         regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
 200         if (IS_ERR(regmap)) {
 201                 dev_err(dev, "Failed to allocate regmap!\n");
 202                 return PTR_ERR(regmap);
 203         }
 204
 205         config.dev = dev;
 206         config.regmap = regmap;
 207
 208         for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
 209                 rdev = devm_regulator_register(dev,
 210                                                &mp5416_regulators_desc[i],
 211                                                &config);
 212                 if (IS_ERR(rdev)) {
 213                         dev_err(dev, "Failed to register regulator!\n");
 214                         return PTR_ERR(rdev);
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220
 221 static const struct of_device_id mp5416_of_match[] = {
 222         { .compatible = "mps,mp5416" },
 223         {},
 224 };
 225 MODULE_DEVICE_TABLE(of, mp5416_of_match);
 226
 227 static const struct i2c_device_id mp5416_id[] = {
 228         { "mp5416", },
 229         { },
 230 };
 231 MODULE_DEVICE_TABLE(i2c, mp5416_id);
 232
 233 static struct i2c_driver mp5416_regulator_driver = {
 234         .driver = {
 235                 .name = "mp5416",
 236                 .of_match_table = of_match_ptr(mp5416_of_match),
 237         },
 238         .probe_new = mp5416_i2c_probe,
 239         .id_table = mp5416_id,
 240 };
 241 module_i2c_driver(mp5416_regulator_driver);
 242
 243 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
 244 MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
 245 MODULE_LICENSE("GPL");