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                 .ramp_reg = MP5416_REG_CTL2,                            \
  71                 .ramp_mask = MP5416_MASK_DVS_SLEWRATE,                  \
  72                 .ramp_delay_table = mp5416_buck_ramp_table,             \
  73                 .n_ramp_values = ARRAY_SIZE(mp5416_buck_ramp_table),    \
  74                 .active_discharge_on    = _dval,                        \
  75                 .active_discharge_reg   = _dreg,                        \
  76                 .active_discharge_mask  = _dval,                        \
  77                 .owner                  = THIS_MODULE,                  \
  78         }
  79
  80 #define MP5416LDO(_name, _id, _dval)                                    \
  81         [MP5416_LDO ## _id] = {                                         \
  82                 .id = MP5416_LDO ## _id,                                \
  83                 .name = _name,                                          \
  84                 .of_match = _name,                                      \
  85                 .regulators_node = "regulators",                        \
  86                 .ops = &mp5416_ldo_ops,                                 \
  87                 .min_uV = MP5416_VOLT2_MIN,                             \
  88                 .uV_step = MP5416_VOLT2_STEP,                           \
  89                 .n_voltages = MP5416_VOLT2_RANGE,                       \
  90                 .vsel_reg = MP5416_REG_LDO ##_id,                       \
  91                 .vsel_mask = MP5416_MASK_VSET,                          \
  92                 .enable_reg = MP5416_REG_LDO ##_id,                     \
  93                 .enable_mask = MP5416_REGULATOR_EN,                     \
  94                 .active_discharge_on    = _dval,                        \
  95                 .active_discharge_reg   = MP5416_REG_CTL2,              \
  96                 .active_discharge_mask  = _dval,                        \
  97                 .owner                  = THIS_MODULE,                  \
  98         }
  99
 100 enum mp5416_regulators {
 101         MP5416_BUCK1,
 102         MP5416_BUCK2,
 103         MP5416_BUCK3,
 104         MP5416_BUCK4,
 105         MP5416_LDO1,
 106         MP5416_LDO2,
 107         MP5416_LDO3,
 108         MP5416_LDO4,
 109         MP5416_MAX_REGULATORS,
 110 };
 111
 112 static const struct regmap_config mp5416_regmap_config = {
 113         .reg_bits = 8,
 114         .val_bits = 8,
 115         .max_register = 0x0d,
 116 };
 117
 118 /* Current limits array (in uA)
 119  * ILIM1 & ILIM3
 120  */
 121 static const unsigned int mp5416_I_limits1[] = {
 122         3800000, 4600000, 5600000, 6800000
 123 };
 124
 125 /* ILIM2 & ILIM4 */
 126 static const unsigned int mp5416_I_limits2[] = {
 127         2200000, 3200000, 4200000, 5200000
 128 };
 129
 130 /*
 131  * DVS ramp rate BUCK1 to BUCK4
 132  * 00: 32mV/us
 133  * 01: 16mV/us
 134  * 10: 8mV/us
 135  * 11: 4mV/us
 136  */
 137 static const unsigned int mp5416_buck_ramp_table[] = {
 138         32000, 16000, 8000, 4000
 139 };
 140
 141 static const struct regulator_ops mp5416_ldo_ops = {
 142         .enable                 = regulator_enable_regmap,
 143         .disable                = regulator_disable_regmap,
 144         .is_enabled             = regulator_is_enabled_regmap,
 145         .list_voltage           = regulator_list_voltage_linear,
 146         .map_voltage            = regulator_map_voltage_linear,
 147         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 148         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 149         .set_active_discharge   = regulator_set_active_discharge_regmap,
 150 };
 151
 152 static const struct regulator_ops mp5416_buck_ops = {
 153         .enable                 = regulator_enable_regmap,
 154         .disable                = regulator_disable_regmap,
 155         .is_enabled             = regulator_is_enabled_regmap,
 156         .list_voltage           = regulator_list_voltage_linear,
 157         .map_voltage            = regulator_map_voltage_linear,
 158         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 159         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 160         .set_active_discharge   = regulator_set_active_discharge_regmap,
 161         .get_current_limit      = regulator_get_current_limit_regmap,
 162         .set_current_limit      = regulator_set_current_limit_regmap,
 163         .set_ramp_delay         = regulator_set_ramp_delay_regmap,
 164 };
 165
 166 static struct regulator_desc mp5416_regulators_desc[MP5416_MAX_REGULATORS] = {
 167         MP5416BUCK("buck1", 1, mp5416_I_limits1, MP5416_REG_CTL1, BIT(0), 1),
 168         MP5416BUCK("buck2", 2, mp5416_I_limits2, MP5416_REG_CTL1, BIT(1), 2),
 169         MP5416BUCK("buck3", 3, mp5416_I_limits1, MP5416_REG_CTL1, BIT(2), 1),
 170         MP5416BUCK("buck4", 4, mp5416_I_limits2, MP5416_REG_CTL2, BIT(5), 2),
 171         MP5416LDO("ldo1", 1, BIT(4)),
 172         MP5416LDO("ldo2", 2, BIT(3)),
 173         MP5416LDO("ldo3", 3, BIT(2)),
 174         MP5416LDO("ldo4", 4, BIT(1)),
 175 };
 176
 177 static int mp5416_i2c_probe(struct i2c_client *client)
 178 {
 179         struct device *dev = &client->dev;
 180         struct regulator_config config = { NULL, };
 181         struct regulator_dev *rdev;
 182         struct regmap *regmap;
 183         int i;
 184
 185         regmap = devm_regmap_init_i2c(client, &mp5416_regmap_config);
 186         if (IS_ERR(regmap)) {
 187                 dev_err(dev, "Failed to allocate regmap!\n");
 188                 return PTR_ERR(regmap);
 189         }
 190
 191         config.dev = dev;
 192         config.regmap = regmap;
 193
 194         for (i = 0; i < MP5416_MAX_REGULATORS; i++) {
 195                 rdev = devm_regulator_register(dev,
 196                                                &mp5416_regulators_desc[i],
 197                                                &config);
 198                 if (IS_ERR(rdev)) {
 199                         dev_err(dev, "Failed to register regulator!\n");
 200                         return PTR_ERR(rdev);
 201                 }
 202         }
 203
 204         return 0;
 205 }
 206
 207 static const struct of_device_id mp5416_of_match[] = {
 208         { .compatible = "mps,mp5416" },
 209         {},
 210 };
 211 MODULE_DEVICE_TABLE(of, mp5416_of_match);
 212
 213 static const struct i2c_device_id mp5416_id[] = {
 214         { "mp5416", },
 215         { },
 216 };
 217 MODULE_DEVICE_TABLE(i2c, mp5416_id);
 218
 219 static struct i2c_driver mp5416_regulator_driver = {
 220         .driver = {
 221                 .name = "mp5416",
 222                 .of_match_table = of_match_ptr(mp5416_of_match),
 223         },
 224         .probe_new = mp5416_i2c_probe,
 225         .id_table = mp5416_id,
 226 };
 227 module_i2c_driver(mp5416_regulator_driver);
 228
 229 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
 230 MODULE_DESCRIPTION("MP5416 PMIC regulator driver");
 231 MODULE_LICENSE("GPL");