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/of_device.h> 15 #include <linux/platform_device.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/of_regulator.h> 18 #include <linux/i2c.h> 19 #include <linux/regmap.h> 20 #include "mpq7920.h" 21 22 #define MPQ7920_BUCK_VOLT_RANGE \ 23 ((MPQ7920_VOLT_MAX - MPQ7920_BUCK_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) 24 #define MPQ7920_LDO_VOLT_RANGE \ 25 ((MPQ7920_VOLT_MAX - MPQ7920_LDO_VOLT_MIN)/MPQ7920_VOLT_STEP + 1) 26 27 #define MPQ7920BUCK(_name, _id, _ilim) \ 28 [MPQ7920_BUCK ## _id] = { \ 29 .id = MPQ7920_BUCK ## _id, \ 30 .name = _name, \ 31 .of_match = _name, \ 32 .regulators_node = "regulators", \ 33 .of_parse_cb = mpq7920_parse_cb, \ 34 .ops = &mpq7920_buck_ops, \ 35 .min_uV = MPQ7920_BUCK_VOLT_MIN, \ 36 .uV_step = MPQ7920_VOLT_STEP, \ 37 .n_voltages = MPQ7920_BUCK_VOLT_RANGE, \ 38 .curr_table = _ilim, \ 39 .n_current_limits = ARRAY_SIZE(_ilim), \ 40 .csel_reg = MPQ7920_BUCK ##_id## _REG_C, \ 41 .csel_mask = MPQ7920_MASK_BUCK_ILIM, \ 42 .enable_reg = MPQ7920_REG_REGULATOR_EN, \ 43 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ 44 MPQ7920_BUCK ## _id), \ 45 .vsel_reg = MPQ7920_BUCK ##_id## _REG_A, \ 46 .vsel_mask = MPQ7920_MASK_VREF, \ 47 .active_discharge_on = MPQ7920_DISCHARGE_ON, \ 48 .active_discharge_reg = MPQ7920_BUCK ##_id## _REG_B, \ 49 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ 50 .soft_start_reg = MPQ7920_BUCK ##_id## _REG_C, \ 51 .soft_start_mask = MPQ7920_MASK_SOFTSTART, \ 52 .owner = THIS_MODULE, \ 53 } 54 55 #define MPQ7920LDO(_name, _id, _ops, _ilim, _ilim_sz, _creg, _cmask) \ 56 [MPQ7920_LDO ## _id] = { \ 57 .id = MPQ7920_LDO ## _id, \ 58 .name = _name, \ 59 .of_match = _name, \ 60 .regulators_node = "regulators", \ 61 .ops = _ops, \ 62 .min_uV = MPQ7920_LDO_VOLT_MIN, \ 63 .uV_step = MPQ7920_VOLT_STEP, \ 64 .n_voltages = MPQ7920_LDO_VOLT_RANGE, \ 65 .vsel_reg = MPQ7920_LDO ##_id## _REG_A, \ 66 .vsel_mask = MPQ7920_MASK_VREF, \ 67 .curr_table = _ilim, \ 68 .n_current_limits = _ilim_sz, \ 69 .csel_reg = _creg, \ 70 .csel_mask = _cmask, \ 71 .enable_reg = (_id == 1) ? 0 : MPQ7920_REG_REGULATOR_EN,\ 72 .enable_mask = BIT(MPQ7920_REGULATOR_EN_OFFSET - \ 73 MPQ7920_LDO ##_id + 1), \ 74 .active_discharge_on = MPQ7920_DISCHARGE_ON, \ 75 .active_discharge_mask = MPQ7920_MASK_DISCHARGE, \ 76 .active_discharge_reg = MPQ7920_LDO ##_id## _REG_B, \ 77 .type = REGULATOR_VOLTAGE, \ 78 .owner = THIS_MODULE, \ 79 } 80 81 enum mpq7920_regulators { 82 MPQ7920_BUCK1, 83 MPQ7920_BUCK2, 84 MPQ7920_BUCK3, 85 MPQ7920_BUCK4, 86 MPQ7920_LDO1, /* LDORTC */ 87 MPQ7920_LDO2, 88 MPQ7920_LDO3, 89 MPQ7920_LDO4, 90 MPQ7920_LDO5, 91 MPQ7920_MAX_REGULATORS, 92 }; 93 94 struct mpq7920_regulator_info { 95 struct regmap *regmap; 96 struct regulator_desc *rdesc; 97 }; 98 99 static const struct regmap_config mpq7920_regmap_config = { 100 .reg_bits = 8, 101 .val_bits = 8, 102 .max_register = 0x25, 103 }; 104 105 /* Current limits array (in uA) 106 * ILIM1 & ILIM3 107 */ 108 static const unsigned int mpq7920_I_limits1[] = { 109 4600000, 6600000, 7600000, 9300000 110 }; 111 112 /* ILIM2 & ILIM4 */ 113 static const unsigned int mpq7920_I_limits2[] = { 114 2700000, 3900000, 5100000, 6100000 115 }; 116 117 /* LDO4 & LDO5 */ 118 static const unsigned int mpq7920_I_limits3[] = { 119 300000, 700000 120 }; 121 122 static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay); 123 static int mpq7920_parse_cb(struct device_node *np, 124 const struct regulator_desc *rdesc, 125 struct regulator_config *config); 126 127 /* RTCLDO not controllable, always ON */ 128 static const struct regulator_ops mpq7920_ldortc_ops = { 129 .list_voltage = regulator_list_voltage_linear, 130 .map_voltage = regulator_map_voltage_linear, 131 .get_voltage_sel = regulator_get_voltage_sel_regmap, 132 .set_voltage_sel = regulator_set_voltage_sel_regmap, 133 }; 134 135 static const struct regulator_ops mpq7920_ldo_wo_current_ops = { 136 .enable = regulator_enable_regmap, 137 .disable = regulator_disable_regmap, 138 .is_enabled = regulator_is_enabled_regmap, 139 .list_voltage = regulator_list_voltage_linear, 140 .map_voltage = regulator_map_voltage_linear, 141 .get_voltage_sel = regulator_get_voltage_sel_regmap, 142 .set_voltage_sel = regulator_set_voltage_sel_regmap, 143 .set_active_discharge = regulator_set_active_discharge_regmap, 144 }; 145 146 static const struct regulator_ops mpq7920_ldo_ops = { 147 .enable = regulator_enable_regmap, 148 .disable = regulator_disable_regmap, 149 .is_enabled = regulator_is_enabled_regmap, 150 .list_voltage = regulator_list_voltage_linear, 151 .map_voltage = regulator_map_voltage_linear, 152 .get_voltage_sel = regulator_get_voltage_sel_regmap, 153 .set_voltage_sel = regulator_set_voltage_sel_regmap, 154 .set_active_discharge = regulator_set_active_discharge_regmap, 155 .get_current_limit = regulator_get_current_limit_regmap, 156 .set_current_limit = regulator_set_current_limit_regmap, 157 }; 158 159 static const struct regulator_ops mpq7920_buck_ops = { 160 .enable = regulator_enable_regmap, 161 .disable = regulator_disable_regmap, 162 .is_enabled = regulator_is_enabled_regmap, 163 .list_voltage = regulator_list_voltage_linear, 164 .map_voltage = regulator_map_voltage_linear, 165 .get_voltage_sel = regulator_get_voltage_sel_regmap, 166 .set_voltage_sel = regulator_set_voltage_sel_regmap, 167 .set_active_discharge = regulator_set_active_discharge_regmap, 168 .set_soft_start = regulator_set_soft_start_regmap, 169 .set_ramp_delay = mpq7920_set_ramp_delay, 170 }; 171 172 static struct regulator_desc mpq7920_regulators_desc[MPQ7920_MAX_REGULATORS] = { 173 MPQ7920BUCK("buck1", 1, mpq7920_I_limits1), 174 MPQ7920BUCK("buck2", 2, mpq7920_I_limits2), 175 MPQ7920BUCK("buck3", 3, mpq7920_I_limits1), 176 MPQ7920BUCK("buck4", 4, mpq7920_I_limits2), 177 MPQ7920LDO("ldortc", 1, &mpq7920_ldortc_ops, NULL, 0, 0, 0), 178 MPQ7920LDO("ldo2", 2, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), 179 MPQ7920LDO("ldo3", 3, &mpq7920_ldo_wo_current_ops, NULL, 0, 0, 0), 180 MPQ7920LDO("ldo4", 4, &mpq7920_ldo_ops, mpq7920_I_limits3, 181 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO4_REG_B, 182 MPQ7920_MASK_LDO_ILIM), 183 MPQ7920LDO("ldo5", 5, &mpq7920_ldo_ops, mpq7920_I_limits3, 184 ARRAY_SIZE(mpq7920_I_limits3), MPQ7920_LDO5_REG_B, 185 MPQ7920_MASK_LDO_ILIM), 186 }; 187 188 /* 189 * DVS ramp rate BUCK1 to BUCK4 190 * 00-01: Reserved 191 * 10: 8mV/us 192 * 11: 4mV/us 193 */ 194 static int mpq7920_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) 195 { 196 unsigned int ramp_val; 197 198 if (ramp_delay > 8000 || ramp_delay < 0) 199 return -EINVAL; 200 201 if (ramp_delay <= 4000) 202 ramp_val = 3; 203 else 204 ramp_val = 2; 205 206 return regmap_update_bits(rdev->regmap, MPQ7920_REG_CTL0, 207 MPQ7920_MASK_DVS_SLEWRATE, ramp_val << 6); 208 } 209 210 static int mpq7920_parse_cb(struct device_node *np, 211 const struct regulator_desc *desc, 212 struct regulator_config *config) 213 { 214 uint8_t val; 215 int ret; 216 struct mpq7920_regulator_info *info = config->driver_data; 217 struct regulator_desc *rdesc = &info->rdesc[desc->id]; 218 219 if (of_property_read_bool(np, "mps,buck-ovp-disable")) { 220 regmap_update_bits(config->regmap, 221 MPQ7920_BUCK1_REG_B + (rdesc->id * 4), 222 MPQ7920_MASK_OVP, MPQ7920_OVP_DISABLE); 223 } 224 225 ret = of_property_read_u8(np, "mps,buck-phase-delay", &val); 226 if (!ret) { 227 regmap_update_bits(config->regmap, 228 MPQ7920_BUCK1_REG_C + (rdesc->id * 4), 229 MPQ7920_MASK_BUCK_PHASE_DEALY, 230 (val & 3) << 4); 231 } 232 233 ret = of_property_read_u8(np, "mps,buck-softstart", &val); 234 if (!ret) 235 rdesc->soft_start_val_on = (val & 3) << 2; 236 237 return 0; 238 } 239 240 static void mpq7920_parse_dt(struct device *dev, 241 struct mpq7920_regulator_info *info) 242 { 243 int ret; 244 struct device_node *np = dev->of_node; 245 uint8_t freq; 246 247 np = of_get_child_by_name(np, "regulators"); 248 if (!np) { 249 dev_err(dev, "missing 'regulators' subnode in DT\n"); 250 return; 251 } 252 253 ret = of_property_read_u8(np, "mps,switch-freq", &freq); 254 if (!ret) { 255 regmap_update_bits(info->regmap, MPQ7920_REG_CTL0, 256 MPQ7920_MASK_SWITCH_FREQ, 257 (freq & 3) << 4); 258 } 259 260 of_node_put(np); 261 } 262 263 static int mpq7920_i2c_probe(struct i2c_client *client) 264 { 265 struct device *dev = &client->dev; 266 struct mpq7920_regulator_info *info; 267 struct regulator_config config = { NULL, }; 268 struct regulator_dev *rdev; 269 struct regmap *regmap; 270 int i; 271 272 info = devm_kzalloc(dev, sizeof(struct mpq7920_regulator_info), 273 GFP_KERNEL); 274 if (!info) 275 return -ENOMEM; 276 277 info->rdesc = mpq7920_regulators_desc; 278 regmap = devm_regmap_init_i2c(client, &mpq7920_regmap_config); 279 if (IS_ERR(regmap)) { 280 dev_err(dev, "Failed to allocate regmap!\n"); 281 return PTR_ERR(regmap); 282 } 283 284 i2c_set_clientdata(client, info); 285 info->regmap = regmap; 286 if (client->dev.of_node) 287 mpq7920_parse_dt(&client->dev, info); 288 289 config.dev = dev; 290 config.regmap = regmap; 291 config.driver_data = info; 292 293 for (i = 0; i < MPQ7920_MAX_REGULATORS; i++) { 294 rdev = devm_regulator_register(dev, 295 &mpq7920_regulators_desc[i], 296 &config); 297 if (IS_ERR(rdev)) { 298 dev_err(dev, "Failed to register regulator!\n"); 299 return PTR_ERR(rdev); 300 } 301 } 302 303 return 0; 304 } 305 306 static const struct of_device_id mpq7920_of_match[] = { 307 { .compatible = "mps,mpq7920"}, 308 {}, 309 }; 310 MODULE_DEVICE_TABLE(of, mpq7920_of_match); 311 312 static const struct i2c_device_id mpq7920_id[] = { 313 { "mpq7920", }, 314 { }, 315 }; 316 MODULE_DEVICE_TABLE(i2c, mpq7920_id); 317 318 static struct i2c_driver mpq7920_regulator_driver = { 319 .driver = { 320 .name = "mpq7920", 321 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 322 .of_match_table = of_match_ptr(mpq7920_of_match), 323 }, 324 .probe = mpq7920_i2c_probe, 325 .id_table = mpq7920_id, 326 }; 327 module_i2c_driver(mpq7920_regulator_driver); 328 329 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>"); 330 MODULE_DESCRIPTION("MPQ7920 PMIC regulator driver"); 331 MODULE_LICENSE("GPL"); 332