1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // mpq7920.c - regulator driver for mps mpq7920 4 // 5 // Copyright 2019 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/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/regulator/driver.h> 16 #include <linux/regulator/of_regulator.h> 17 #include <linux/i2c.h> 18 #include <linux/regmap.h> 19 #include "mpq7920.h" 20 21 #define MPQ7920_BUCK_VOLT_RANGE \ 22 ((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) 23 #define MPQ7920_LDO_VOLT_RANGE \ 24 ((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) 25 26 #define MPQ7920BUCK(_name, _id, _ilim) \ 27 [MPQ7920_BUCK ## _id] = { \ 28 .id = MPQ7920_BUCK ## _id, \ 29 .name = _name, \ 30 .of_match = _name, \ 31 .regulators_node = "regulators", \ 32 .of_parse_cb = mpq7920_parse_cb, \ 33 .ops = &mpq7920_buck_ops, \ 34 .min_uV = MPQ7920_BUCK_VOLT_MIN, \ 35 .uV_step = MPQ7920_VOLT_STEP, \ 36 .n_voltages = MPQ7920_BUCK_VOLT_RANGE, \ 37 .curr_table = _ilim, \ 38 .n_current_limits = ARRAY_SIZE(_ilim), \ 39 .csel_reg = MPQ7920_BUCK ##_id## _REG_C, \ 40 .csel_mask = MPQ7920_MASK_BUCK_ILIM, \ 41 .enable_reg = MPQ7920_REG_REGULATOR_EN, \ 42 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ 43 MPQ7920_BUCK ## _id), \ 44 .vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \ 45 .vsel_mask = MPQ7920_MASK_VREF, \ 46 .active_discharge_on = MPQ7920_DISCHARGE_ON, \ 47 .active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \ 48 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ 49 .soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \ 50 .soft_start_mask = MPQ7920_MASK_SOFTSTART, \ 51 .owner = THIS_MODULE, \ 52 } 53 54 #define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \ 55 [MPQ7920_LDO ## _id] = { \ 56 .id = MPQ7920_LDO ## _id, \ 57 .name = _name, \ 58 .of_match = _name, \ 59 .regulators_node = "regulators", \ 60 .ops = _ops, \ 61 .min_uV = MPQ7920_LDO_VOLT_MIN, \ 62 .uV_step = MPQ7920_VOLT_STEP, \ 63 .n_voltages = MPQ7920_LDO_VOLT_RANGE, \ 64 .vsel_reg = MPQ7920_LDO ##_id## _REG_A, \ 65 .vsel_mask = MPQ7920_MASK_VREF, \ 66 .curr_table = _ilim, \ 67 .n_current_limits = _ilim_sz, \ 68 .csel_reg = _creg, \ 69 .csel_mask = _cmask, \ 70 .enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\ 71 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ 72 MPQ7920_LDO ##_id + 1), \ 73 .active_discharge_on = MPQ7920_DISCHARGE_ON, \ 74 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ 75 .active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \ 76 .type = REGULATOR_VOLTAGE, \ 77 .owner = THIS_MODULE, \ 78 } 79 80 enum mpq7920_regulators { 81 MPQ7920_BUCK1, 82 MPQ7920_BUCK2, 83 MPQ7920_BUCK3, 84 MPQ7920_BUCK4, 85 MPQ7920_LDO1, /* LDORTC */ 86 MPQ7920_LDO2, 87 MPQ7920_LDO3, 88 MPQ7920_LDO4, 89 MPQ7920_LDO5, 90 MPQ7920_MAX_REGULATORS, 91 }; 92 93 struct mpq7920_regulator_info { 94 struct regmap *regmap; 95 struct regulator_desc *rdesc; 96 }; 97 98 static const struct regmap_config mpq7920_regmap_config = { 99 .reg_bits = 8, 100 .val_bits = 8, 101 .max_register = 0x25, 102 }; 103 104 /* Current limits array (in uA) 105 * ILIM1 & ILIM3 106 */ 107 static const unsigned int mpq7920_I_limits1[] = { 108 4600000, 6600000, 7600000, 9300000 109 }; 110 111 /* ILIM2 & ILIM4 */ 112 static const unsigned int mpq7920_I_limits2[] = { 113 2700000, 3900000, 5100000, 6100000 114 }; 115 116 /* LDO4 & LDO5 */ 117 static const unsigned int mpq7920_I_limits3[] = { 118 300000, 700000 119 }; 120 121 static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay); 122 static int mpq7920_parse_cb(struct device_node *np, 123 const struct regulator_desc *rdesc, 124 struct regulator_config *config); 125 126 /* RTCLDO not controllable, always ON */ 127 static const struct regulator_ops mpq7920_ldortc_ops = { 128 .list_voltage = regulator_list_voltage_linear, 129 .map_voltage = regulator_map_voltage_linear, 130 .get_voltage_sel = regulator_get_voltage_sel_regmap, 131 .set_voltage_sel = regulator_set_voltage_sel_regmap, 132 }; 133 134 static const struct regulator_ops mpq7920_ldo_wo_current_ops = { 135 .enable = regulator_enable_regmap, 136 .disable = regulator_disable_regmap, 137 .is_enabled = regulator_is_enabled_regmap, 138 .list_voltage = regulator_list_voltage_linear, 139 .map_voltage = regulator_map_voltage_linear, 140 .get_voltage_sel = regulator_get_voltage_sel_regmap, 141 .set_voltage_sel = regulator_set_voltage_sel_regmap, 142 .set_active_discharge = regulator_set_active_discharge_regmap, 143 }; 144 145 static const struct regulator_ops mpq7920_ldo_ops = { 146 .enable = regulator_enable_regmap, 147 .disable = regulator_disable_regmap, 148 .is_enabled = regulator_is_enabled_regmap, 149 .list_voltage = regulator_list_voltage_linear, 150 .map_voltage = regulator_map_voltage_linear, 151 .get_voltage_sel = regulator_get_voltage_sel_regmap, 152 .set_voltage_sel = regulator_set_voltage_sel_regmap, 153 .set_active_discharge = regulator_set_active_discharge_regmap, 154 .get_current_limit = regulator_get_current_limit_regmap, 155 .set_current_limit = regulator_set_current_limit_regmap, 156 }; 157 158 static const struct regulator_ops mpq7920_buck_ops = { 159 .enable = regulator_enable_regmap, 160 .disable = regulator_disable_regmap, 161 .is_enabled = regulator_is_enabled_regmap, 162 .list_voltage = regulator_list_voltage_linear, 163 .map_voltage = regulator_map_voltage_linear, 164 .get_voltage_sel = regulator_get_voltage_sel_regmap, 165 .set_voltage_sel = regulator_set_voltage_sel_regmap, 166 .set_active_discharge = regulator_set_active_discharge_regmap, 167 .set_soft_start = regulator_set_soft_start_regmap, 168 .set_ramp_delay = mpq7920_set_ramp_delay, 169 }; 170 171 static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = { 172 MPQ7920BUCK("buck1", 1, mpq7920_I_limits1), 173 MPQ7920BUCK("buck2", 2, mpq7920_I_limits2), 174 MPQ7920BUCK("buck3", 3, mpq7920_I_limits1), 175 MPQ7920BUCK("buck4", 4, mpq7920_I_limits2), 176 MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0), 177 MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), 178 MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), 179 MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3, 180 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B, 181 MPQ7920_MASK_LDO_ILIM), 182 MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3, 183 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B, 184 MPQ7920_MASK_LDO_ILIM), 185 }; 186 187 /* 188 * DVS ramp rate BUCK1 to BUCK4 189 * 00-01: Reserved 190 * 10: 8mV/us 191 * 11: 4mV/us 192 */ 193 static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) 194 { 195 unsigned int ramp_val; 196 197 if (ramp_delay > 8000 || ramp_delay < 0) 198 return -EINVAL; 199 200 if (ramp_delay <= 4000) 201 ramp_val = 3; 202 else 203 ramp_val = 2; 204 205 return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0, 206 MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6); 207 } 208 209 static int mpq7920_parse_cb(struct device_node *np, 210 const struct regulator_desc *desc, 211 struct regulator_config *config) 212 { 213 uint8_t val; 214 int ret; 215 struct mpq7920_regulator_info *info = config->driver_data; 216 struct regulator_desc *rdesc = &info->rdesc[desc->id]; 217 218 if (of_property_read_bool(np, "mps,buck-ovp-disable")) { 219 regmap_update_bits(config->regmap, 220 MPQ7920_BUCK1_REG_B + (rdesc->id * 4), 221 MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE); 222 } 223 224 ret = of_property_read_u8(np, "mps,buck-phase-delay", &val); 225 if (!ret) { 226 regmap_update_bits(config->regmap, 227 MPQ7920_BUCK1_REG_C + (rdesc->id * 4), 228 MPQ7920_MASK_BUCK_PHASE_DEALY, 229 (val & 3) << 4); 230 } 231 232 ret = of_property_read_u8(np, "mps,buck-softstart", &val); 233 if (!ret) 234 rdesc->soft_start_val_on = (val & 3) << 2; 235 236 return 0; 237 } 238 239 static void mpq7920_parse_dt(struct device *dev, 240 struct mpq7920_regulator_info *info) 241 { 242 int ret; 243 struct device_node *np = dev->of_node; 244 uint8_t freq; 245 246 np = of_get_child_by_name(np, "regulators"); 247 if (!np) { 248 dev_err(dev, "missing 'regulators' subnode in DT\n"); 249 return; 250 } 251 252 ret = of_property_read_u8(np, "mps,switch-freq", &freq); 253 if (!ret) { 254 regmap_update_bits(info->regmap, MPQ7920_REG_CTL0, 255 MPQ7920_MASK_SWITCH_FREQ, 256 (freq & 3) << 4); 257 } 258 259 of_node_put(np); 260 } 261 262 static int mpq7920_i2c_probe(struct i2c_client *client) 263 { 264 struct device *dev = &client->dev; 265 struct mpq7920_regulator_info *info; 266 struct regulator_config config = { NULL, }; 267 struct regulator_dev *rdev; 268 struct regmap *regmap; 269 int i; 270 271 info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info), 272 GFP_KERNEL); 273 if (!info) 274 return -ENOMEM; 275 276 info->rdesc = mpq7920_regulators_desc; 277 regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config); 278 if (IS_ERR(regmap)) { 279 dev_err(dev, "Failed to allocate regmap!\n"); 280 return PTR_ERR(regmap); 281 } 282 283 i2c_set_clientdata(client, info); 284 info->regmap = regmap; 285 if (client->dev.of_node) 286 mpq7920_parse_dt(&client->dev, info); 287 288 config.dev = dev; 289 config.regmap = regmap; 290 config.driver_data = info; 291 292 for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) { 293 rdev = devm_regulator_register(dev, 294 &mpq7920_regulators_desc[i], 295 &config); 296 if (IS_ERR(rdev)) { 297 dev_err(dev, "Failed to register regulator!\n"); 298 return PTR_ERR(rdev); 299 } 300 } 301 302 return 0; 303 } 304 305 static const struct of_device_id mpq7920_of_match[] = { 306 { .compatible = "mps,mpq7920"}, 307 {}, 308 }; 309 MODULE_DEVICE_TABLE(of, mpq7920_of_match); 310 311 static const struct i2c_device_id mpq7920_id[] = { 312 { "mpq7920", }, 313 { }, 314 }; 315 MODULE_DEVICE_TABLE(i2c, mpq7920_id); 316 317 static struct i2c_driver mpq7920_regulator_driver = { 318 .driver = { 319 .name = "mpq7920", 320 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 321 .of_match_table = mpq7920_of_match, 322 }, 323 .probe = mpq7920_i2c_probe, 324 .id_table = mpq7920_id, 325 }; 326 module_i2c_driver(mpq7920_regulator_driver); 327 328 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); 329 MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver"); 330 MODULE_LICENSE("GPL"); 331