1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * max8973-regulator.c -- Maxim max8973A 4 * 5 * Regulator driver for MAXIM 8973A DC-DC step-down switching regulator. 6 * 7 * Copyright (c) 2012, NVIDIA Corporation. 8 * 9 * Author: Laxman Dewangan <ldewangan@nvidia.com> 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/err.h> 16 #include <linux/of.h> 17 #include <linux/of_device.h> 18 #include <linux/platform_device.h> 19 #include <linux/regulator/driver.h> 20 #include <linux/regulator/machine.h> 21 #include <linux/regulator/max8973-regulator.h> 22 #include <linux/regulator/of_regulator.h> 23 #include <linux/gpio.h> 24 #include <linux/gpio/consumer.h> 25 #include <linux/of_gpio.h> 26 #include <linux/i2c.h> 27 #include <linux/slab.h> 28 #include <linux/regmap.h> 29 #include <linux/thermal.h> 30 #include <linux/irq.h> 31 #include <linux/interrupt.h> 32 33 /* Register definitions */ 34 #define MAX8973_VOUT 0x0 35 #define MAX8973_VOUT_DVS 0x1 36 #define MAX8973_CONTROL1 0x2 37 #define MAX8973_CONTROL2 0x3 38 #define MAX8973_CHIPID1 0x4 39 #define MAX8973_CHIPID2 0x5 40 41 #define MAX8973_MAX_VOUT_REG 2 42 43 /* MAX8973_VOUT */ 44 #define MAX8973_VOUT_ENABLE BIT(7) 45 #define MAX8973_VOUT_MASK 0x7F 46 47 /* MAX8973_VOUT_DVS */ 48 #define MAX8973_DVS_VOUT_MASK 0x7F 49 50 /* MAX8973_CONTROL1 */ 51 #define MAX8973_SNS_ENABLE BIT(7) 52 #define MAX8973_FPWM_EN_M BIT(6) 53 #define MAX8973_NFSR_ENABLE BIT(5) 54 #define MAX8973_AD_ENABLE BIT(4) 55 #define MAX8973_BIAS_ENABLE BIT(3) 56 #define MAX8973_FREQSHIFT_9PER BIT(2) 57 58 #define MAX8973_RAMP_12mV_PER_US 0x0 59 #define MAX8973_RAMP_25mV_PER_US 0x1 60 #define MAX8973_RAMP_50mV_PER_US 0x2 61 #define MAX8973_RAMP_200mV_PER_US 0x3 62 #define MAX8973_RAMP_MASK 0x3 63 64 /* MAX8973_CONTROL2 */ 65 #define MAX8973_WDTMR_ENABLE BIT(6) 66 #define MAX8973_DISCH_ENBABLE BIT(5) 67 #define MAX8973_FT_ENABLE BIT(4) 68 #define MAX77621_T_JUNCTION_120 BIT(7) 69 70 #define MAX8973_CKKADV_TRIP_MASK 0xC 71 #define MAX8973_CKKADV_TRIP_DISABLE 0xC 72 #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 73 #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 74 #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 75 #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 76 77 #define MAX8973_INDUCTOR_MIN_30_PER 0x0 78 #define MAX8973_INDUCTOR_NOMINAL 0x1 79 #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 80 #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 81 #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 82 83 #define MAX8973_MIN_VOLATGE 606250 84 #define MAX8973_MAX_VOLATGE 1400000 85 #define MAX8973_VOLATGE_STEP 6250 86 #define MAX8973_BUCK_N_VOLTAGE 0x80 87 88 #define MAX77621_CHIPID_TJINT_S BIT(0) 89 90 #define MAX77621_NORMAL_OPERATING_TEMP 100000 91 #define MAX77621_TJINT_WARNING_TEMP_120 120000 92 #define MAX77621_TJINT_WARNING_TEMP_140 140000 93 94 enum device_id { 95 MAX8973, 96 MAX77621 97 }; 98 99 /* Maxim 8973 chip information */ 100 struct max8973_chip { 101 struct device *dev; 102 struct regulator_desc desc; 103 struct regmap *regmap; 104 bool enable_external_control; 105 int dvs_gpio; 106 int lru_index[MAX8973_MAX_VOUT_REG]; 107 int curr_vout_val[MAX8973_MAX_VOUT_REG]; 108 int curr_vout_reg; 109 int curr_gpio_val; 110 struct regulator_ops ops; 111 enum device_id id; 112 int junction_temp_warning; 113 int irq; 114 struct thermal_zone_device *tz_device; 115 }; 116 117 /* 118 * find_voltage_set_register: Find new voltage configuration register (VOUT). 119 * The finding of the new VOUT register will be based on the LRU mechanism. 120 * Each VOUT register will have different voltage configured . This 121 * Function will look if any of the VOUT register have requested voltage set 122 * or not. 123 * - If it is already there then it will make that register as most 124 * recently used and return as found so that caller need not to set 125 * the VOUT register but need to set the proper gpios to select this 126 * VOUT register. 127 * - If requested voltage is not found then it will use the least 128 * recently mechanism to get new VOUT register for new configuration 129 * and will return not_found so that caller need to set new VOUT 130 * register and then gpios (both). 131 */ 132 static bool find_voltage_set_register(struct max8973_chip *tps, 133 int req_vsel, int *vout_reg, int *gpio_val) 134 { 135 int i; 136 bool found = false; 137 int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; 138 int found_index = MAX8973_MAX_VOUT_REG - 1; 139 140 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { 141 if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { 142 new_vout_reg = tps->lru_index[i]; 143 found_index = i; 144 found = true; 145 goto update_lru_index; 146 } 147 } 148 149 update_lru_index: 150 for (i = found_index; i > 0; i--) 151 tps->lru_index[i] = tps->lru_index[i - 1]; 152 153 tps->lru_index[0] = new_vout_reg; 154 *gpio_val = new_vout_reg; 155 *vout_reg = MAX8973_VOUT + new_vout_reg; 156 return found; 157 } 158 159 static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) 160 { 161 struct max8973_chip *max = rdev_get_drvdata(rdev); 162 unsigned int data; 163 int ret; 164 165 ret = regmap_read(max->regmap, max->curr_vout_reg, &data); 166 if (ret < 0) { 167 dev_err(max->dev, "register %d read failed, err = %d\n", 168 max->curr_vout_reg, ret); 169 return ret; 170 } 171 return data & MAX8973_VOUT_MASK; 172 } 173 174 static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, 175 unsigned vsel) 176 { 177 struct max8973_chip *max = rdev_get_drvdata(rdev); 178 int ret; 179 bool found = false; 180 int vout_reg = max->curr_vout_reg; 181 int gpio_val = max->curr_gpio_val; 182 183 /* 184 * If gpios are available to select the VOUT register then least 185 * recently used register for new configuration. 186 */ 187 if (gpio_is_valid(max->dvs_gpio)) 188 found = find_voltage_set_register(max, vsel, 189 &vout_reg, &gpio_val); 190 191 if (!found) { 192 ret = regmap_update_bits(max->regmap, vout_reg, 193 MAX8973_VOUT_MASK, vsel); 194 if (ret < 0) { 195 dev_err(max->dev, "register %d update failed, err %d\n", 196 vout_reg, ret); 197 return ret; 198 } 199 max->curr_vout_reg = vout_reg; 200 max->curr_vout_val[gpio_val] = vsel; 201 } 202 203 /* Select proper VOUT register vio gpios */ 204 if (gpio_is_valid(max->dvs_gpio)) { 205 gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); 206 max->curr_gpio_val = gpio_val; 207 } 208 return 0; 209 } 210 211 static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 212 { 213 struct max8973_chip *max = rdev_get_drvdata(rdev); 214 int ret; 215 int pwm; 216 217 /* Enable force PWM mode in FAST mode only. */ 218 switch (mode) { 219 case REGULATOR_MODE_FAST: 220 pwm = MAX8973_FPWM_EN_M; 221 break; 222 223 case REGULATOR_MODE_NORMAL: 224 pwm = 0; 225 break; 226 227 default: 228 return -EINVAL; 229 } 230 231 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, 232 MAX8973_FPWM_EN_M, pwm); 233 if (ret < 0) 234 dev_err(max->dev, "register %d update failed, err %d\n", 235 MAX8973_CONTROL1, ret); 236 return ret; 237 } 238 239 static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) 240 { 241 struct max8973_chip *max = rdev_get_drvdata(rdev); 242 unsigned int data; 243 int ret; 244 245 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); 246 if (ret < 0) { 247 dev_err(max->dev, "register %d read failed, err %d\n", 248 MAX8973_CONTROL1, ret); 249 return ret; 250 } 251 return (data & MAX8973_FPWM_EN_M) ? 252 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; 253 } 254 255 static int max8973_set_current_limit(struct regulator_dev *rdev, 256 int min_ua, int max_ua) 257 { 258 struct max8973_chip *max = rdev_get_drvdata(rdev); 259 unsigned int val; 260 int ret; 261 262 if (max_ua <= 9000000) 263 val = MAX8973_CKKADV_TRIP_75mV_PER_US; 264 else if (max_ua <= 12000000) 265 val = MAX8973_CKKADV_TRIP_150mV_PER_US; 266 else 267 val = MAX8973_CKKADV_TRIP_DISABLE; 268 269 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2, 270 MAX8973_CKKADV_TRIP_MASK, val); 271 if (ret < 0) { 272 dev_err(max->dev, "register %d update failed: %d\n", 273 MAX8973_CONTROL2, ret); 274 return ret; 275 } 276 return 0; 277 } 278 279 static int max8973_get_current_limit(struct regulator_dev *rdev) 280 { 281 struct max8973_chip *max = rdev_get_drvdata(rdev); 282 unsigned int control2; 283 int ret; 284 285 ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2); 286 if (ret < 0) { 287 dev_err(max->dev, "register %d read failed: %d\n", 288 MAX8973_CONTROL2, ret); 289 return ret; 290 } 291 switch (control2 & MAX8973_CKKADV_TRIP_MASK) { 292 case MAX8973_CKKADV_TRIP_DISABLE: 293 return 15000000; 294 case MAX8973_CKKADV_TRIP_150mV_PER_US: 295 return 12000000; 296 case MAX8973_CKKADV_TRIP_75mV_PER_US: 297 return 9000000; 298 default: 299 break; 300 } 301 return 9000000; 302 } 303 304 static const unsigned int max8973_buck_ramp_table[] = { 305 12000, 25000, 50000, 200000 306 }; 307 308 static const struct regulator_ops max8973_dcdc_ops = { 309 .get_voltage_sel = max8973_dcdc_get_voltage_sel, 310 .set_voltage_sel = max8973_dcdc_set_voltage_sel, 311 .list_voltage = regulator_list_voltage_linear, 312 .set_mode = max8973_dcdc_set_mode, 313 .get_mode = max8973_dcdc_get_mode, 314 .set_voltage_time_sel = regulator_set_voltage_time_sel, 315 .set_ramp_delay = regulator_set_ramp_delay_regmap, 316 }; 317 318 static int max8973_init_dcdc(struct max8973_chip *max, 319 struct max8973_regulator_platform_data *pdata) 320 { 321 int ret; 322 uint8_t control1 = 0; 323 uint8_t control2 = 0; 324 unsigned int data; 325 326 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); 327 if (ret < 0) { 328 dev_err(max->dev, "register %d read failed, err = %d", 329 MAX8973_CONTROL1, ret); 330 return ret; 331 } 332 control1 = data & MAX8973_RAMP_MASK; 333 switch (control1) { 334 case MAX8973_RAMP_12mV_PER_US: 335 max->desc.ramp_delay = 12000; 336 break; 337 case MAX8973_RAMP_25mV_PER_US: 338 max->desc.ramp_delay = 25000; 339 break; 340 case MAX8973_RAMP_50mV_PER_US: 341 max->desc.ramp_delay = 50000; 342 break; 343 case MAX8973_RAMP_200mV_PER_US: 344 max->desc.ramp_delay = 200000; 345 break; 346 } 347 348 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) 349 control1 |= MAX8973_SNS_ENABLE; 350 351 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) 352 control1 |= MAX8973_NFSR_ENABLE; 353 354 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) 355 control1 |= MAX8973_AD_ENABLE; 356 357 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { 358 control1 |= MAX8973_BIAS_ENABLE; 359 max->desc.enable_time = 20; 360 } else { 361 max->desc.enable_time = 240; 362 } 363 364 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) 365 control1 |= MAX8973_FREQSHIFT_9PER; 366 367 if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && 368 (max->id == MAX77621)) 369 control2 |= MAX77621_T_JUNCTION_120; 370 371 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) 372 control2 |= MAX8973_DISCH_ENBABLE; 373 374 /* Clock advance trip configuration */ 375 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { 376 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: 377 control2 |= MAX8973_CKKADV_TRIP_DISABLE; 378 break; 379 380 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: 381 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; 382 break; 383 384 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: 385 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; 386 break; 387 388 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: 389 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; 390 break; 391 } 392 393 /* Configure inductor value */ 394 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { 395 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: 396 control2 |= MAX8973_INDUCTOR_NOMINAL; 397 break; 398 399 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: 400 control2 |= MAX8973_INDUCTOR_MIN_30_PER; 401 break; 402 403 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: 404 control2 |= MAX8973_INDUCTOR_PLUS_30_PER; 405 break; 406 407 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: 408 control2 |= MAX8973_INDUCTOR_PLUS_60_PER; 409 break; 410 } 411 412 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); 413 if (ret < 0) { 414 dev_err(max->dev, "register %d write failed, err = %d", 415 MAX8973_CONTROL1, ret); 416 return ret; 417 } 418 419 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); 420 if (ret < 0) { 421 dev_err(max->dev, "register %d write failed, err = %d", 422 MAX8973_CONTROL2, ret); 423 return ret; 424 } 425 426 /* If external control is enabled then disable EN bit */ 427 if (max->enable_external_control && (max->id == MAX8973)) { 428 ret = regmap_update_bits(max->regmap, MAX8973_VOUT, 429 MAX8973_VOUT_ENABLE, 0); 430 if (ret < 0) 431 dev_err(max->dev, "register %d update failed, err = %d", 432 MAX8973_VOUT, ret); 433 } 434 return ret; 435 } 436 437 static int max8973_thermal_read_temp(struct thermal_zone_device *tz, int *temp) 438 { 439 struct max8973_chip *mchip = thermal_zone_device_priv(tz); 440 unsigned int val; 441 int ret; 442 443 ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); 444 if (ret < 0) { 445 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); 446 return ret; 447 } 448 449 /* +1 degC to trigger cool device */ 450 if (val & MAX77621_CHIPID_TJINT_S) 451 *temp = mchip->junction_temp_warning + 1000; 452 else 453 *temp = MAX77621_NORMAL_OPERATING_TEMP; 454 455 return 0; 456 } 457 458 static irqreturn_t max8973_thermal_irq(int irq, void *data) 459 { 460 struct max8973_chip *mchip = data; 461 462 thermal_zone_device_update(mchip->tz_device, 463 THERMAL_EVENT_UNSPECIFIED); 464 465 return IRQ_HANDLED; 466 } 467 468 static const struct thermal_zone_device_ops max77621_tz_ops = { 469 .get_temp = max8973_thermal_read_temp, 470 }; 471 472 static int max8973_thermal_init(struct max8973_chip *mchip) 473 { 474 struct thermal_zone_device *tzd; 475 struct irq_data *irq_data; 476 unsigned long irq_flags = 0; 477 int ret; 478 479 if (mchip->id != MAX77621) 480 return 0; 481 482 tzd = devm_thermal_of_zone_register(mchip->dev, 0, mchip, 483 &max77621_tz_ops); 484 if (IS_ERR(tzd)) { 485 ret = PTR_ERR(tzd); 486 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n", 487 ret); 488 return ret; 489 } 490 491 if (mchip->irq <= 0) 492 return 0; 493 494 irq_data = irq_get_irq_data(mchip->irq); 495 if (irq_data) 496 irq_flags = irqd_get_trigger_type(irq_data); 497 498 ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, 499 max8973_thermal_irq, 500 IRQF_ONESHOT | IRQF_SHARED | irq_flags, 501 dev_name(mchip->dev), mchip); 502 if (ret < 0) { 503 dev_err(mchip->dev, "Failed to request irq %d, %d\n", 504 mchip->irq, ret); 505 return ret; 506 } 507 508 return 0; 509 } 510 511 static const struct regmap_config max8973_regmap_config = { 512 .reg_bits = 8, 513 .val_bits = 8, 514 .max_register = MAX8973_CHIPID2, 515 .cache_type = REGCACHE_RBTREE, 516 }; 517 518 static struct max8973_regulator_platform_data *max8973_parse_dt( 519 struct device *dev) 520 { 521 struct max8973_regulator_platform_data *pdata; 522 struct device_node *np = dev->of_node; 523 int ret; 524 u32 pval; 525 bool etr_enable; 526 bool etr_sensitivity_high; 527 528 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 529 if (!pdata) 530 return NULL; 531 532 pdata->enable_ext_control = of_property_read_bool(np, 533 "maxim,externally-enable"); 534 pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); 535 536 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); 537 if (!ret) 538 pdata->dvs_def_state = pval; 539 540 if (of_property_read_bool(np, "maxim,enable-remote-sense")) 541 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; 542 543 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) 544 pdata->control_flags |= 545 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; 546 547 if (of_property_read_bool(np, "maxim,enable-active-discharge")) 548 pdata->control_flags |= 549 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; 550 551 if (of_property_read_bool(np, "maxim,enable-frequency-shift")) 552 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; 553 554 if (of_property_read_bool(np, "maxim,enable-bias-control")) 555 pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; 556 557 etr_enable = of_property_read_bool(np, "maxim,enable-etr"); 558 etr_sensitivity_high = of_property_read_bool(np, 559 "maxim,enable-high-etr-sensitivity"); 560 if (etr_sensitivity_high) 561 etr_enable = true; 562 563 if (etr_enable) { 564 if (etr_sensitivity_high) 565 pdata->control_flags |= 566 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; 567 else 568 pdata->control_flags |= 569 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; 570 } else { 571 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; 572 } 573 574 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; 575 ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); 576 if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) 577 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; 578 579 return pdata; 580 } 581 582 static const struct of_device_id of_max8973_match_tbl[] = { 583 { .compatible = "maxim,max8973", .data = (void *)MAX8973, }, 584 { .compatible = "maxim,max77621", .data = (void *)MAX77621, }, 585 { }, 586 }; 587 MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); 588 589 static int max8973_probe(struct i2c_client *client) 590 { 591 const struct i2c_device_id *id = i2c_client_get_device_id(client); 592 struct max8973_regulator_platform_data *pdata; 593 struct regulator_init_data *ridata; 594 struct regulator_config config = { }; 595 struct regulator_dev *rdev; 596 struct max8973_chip *max; 597 bool pdata_from_dt = false; 598 unsigned int chip_id; 599 struct gpio_desc *gpiod; 600 enum gpiod_flags gflags; 601 int ret; 602 603 pdata = dev_get_platdata(&client->dev); 604 605 if (!pdata && client->dev.of_node) { 606 pdata = max8973_parse_dt(&client->dev); 607 pdata_from_dt = true; 608 } 609 610 if (!pdata) { 611 dev_err(&client->dev, "No Platform data"); 612 return -EIO; 613 } 614 615 if (pdata->dvs_gpio == -EPROBE_DEFER) 616 return -EPROBE_DEFER; 617 618 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); 619 if (!max) 620 return -ENOMEM; 621 622 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); 623 if (IS_ERR(max->regmap)) { 624 ret = PTR_ERR(max->regmap); 625 dev_err(&client->dev, "regmap init failed, err %d\n", ret); 626 return ret; 627 } 628 629 if (client->dev.of_node) { 630 const struct of_device_id *match; 631 632 match = of_match_device(of_match_ptr(of_max8973_match_tbl), 633 &client->dev); 634 if (!match) 635 return -ENODATA; 636 max->id = (u32)((uintptr_t)match->data); 637 } else { 638 max->id = id->driver_data; 639 } 640 641 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); 642 if (ret < 0) { 643 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); 644 return ret; 645 } 646 647 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", 648 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); 649 650 i2c_set_clientdata(client, max); 651 max->ops = max8973_dcdc_ops; 652 max->dev = &client->dev; 653 max->desc.name = id->name; 654 max->desc.id = 0; 655 max->desc.ops = &max->ops; 656 max->desc.type = REGULATOR_VOLTAGE; 657 max->desc.owner = THIS_MODULE; 658 max->desc.min_uV = MAX8973_MIN_VOLATGE; 659 max->desc.uV_step = MAX8973_VOLATGE_STEP; 660 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; 661 max->desc.ramp_reg = MAX8973_CONTROL1; 662 max->desc.ramp_mask = MAX8973_RAMP_MASK; 663 max->desc.ramp_delay_table = max8973_buck_ramp_table; 664 max->desc.n_ramp_values = ARRAY_SIZE(max8973_buck_ramp_table); 665 666 max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; 667 max->enable_external_control = pdata->enable_ext_control; 668 max->curr_gpio_val = pdata->dvs_def_state; 669 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; 670 max->junction_temp_warning = pdata->junction_temp_warning; 671 672 max->lru_index[0] = max->curr_vout_reg; 673 674 if (gpio_is_valid(max->dvs_gpio)) { 675 int gpio_flags; 676 int i; 677 678 gpio_flags = (pdata->dvs_def_state) ? 679 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; 680 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, 681 gpio_flags, "max8973-dvs"); 682 if (ret) { 683 dev_err(&client->dev, 684 "gpio_request for gpio %d failed, err = %d\n", 685 max->dvs_gpio, ret); 686 return ret; 687 } 688 689 /* 690 * Initialize the lru index with vout_reg id 691 * The index 0 will be most recently used and 692 * set with the max->curr_vout_reg */ 693 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) 694 max->lru_index[i] = i; 695 max->lru_index[0] = max->curr_vout_reg; 696 max->lru_index[max->curr_vout_reg] = 0; 697 } else { 698 /* 699 * If there is no DVS GPIO, the VOUT register 700 * address is fixed. 701 */ 702 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; 703 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; 704 max->desc.vsel_reg = max->curr_vout_reg; 705 max->desc.vsel_mask = MAX8973_VOUT_MASK; 706 } 707 708 if (pdata_from_dt) 709 pdata->reg_init_data = of_get_regulator_init_data(&client->dev, 710 client->dev.of_node, &max->desc); 711 712 ridata = pdata->reg_init_data; 713 switch (max->id) { 714 case MAX8973: 715 if (!pdata->enable_ext_control) { 716 max->desc.enable_reg = MAX8973_VOUT; 717 max->desc.enable_mask = MAX8973_VOUT_ENABLE; 718 max->ops.enable = regulator_enable_regmap; 719 max->ops.disable = regulator_disable_regmap; 720 max->ops.is_enabled = regulator_is_enabled_regmap; 721 break; 722 } 723 724 if (ridata && (ridata->constraints.always_on || 725 ridata->constraints.boot_on)) 726 gflags = GPIOD_OUT_HIGH; 727 else 728 gflags = GPIOD_OUT_LOW; 729 gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; 730 gpiod = devm_gpiod_get_optional(&client->dev, 731 "maxim,enable", 732 gflags); 733 if (IS_ERR(gpiod)) 734 return PTR_ERR(gpiod); 735 if (gpiod) { 736 config.ena_gpiod = gpiod; 737 max->enable_external_control = true; 738 } 739 740 break; 741 742 case MAX77621: 743 /* 744 * We do not let the core switch this regulator on/off, 745 * we just leave it on. 746 */ 747 gpiod = devm_gpiod_get_optional(&client->dev, 748 "maxim,enable", 749 GPIOD_OUT_HIGH); 750 if (IS_ERR(gpiod)) 751 return PTR_ERR(gpiod); 752 if (gpiod) 753 max->enable_external_control = true; 754 755 max->desc.enable_reg = MAX8973_VOUT; 756 max->desc.enable_mask = MAX8973_VOUT_ENABLE; 757 max->ops.enable = regulator_enable_regmap; 758 max->ops.disable = regulator_disable_regmap; 759 max->ops.is_enabled = regulator_is_enabled_regmap; 760 max->ops.set_current_limit = max8973_set_current_limit; 761 max->ops.get_current_limit = max8973_get_current_limit; 762 break; 763 default: 764 break; 765 } 766 767 ret = max8973_init_dcdc(max, pdata); 768 if (ret < 0) { 769 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); 770 return ret; 771 } 772 773 config.dev = &client->dev; 774 config.init_data = pdata->reg_init_data; 775 config.driver_data = max; 776 config.of_node = client->dev.of_node; 777 config.regmap = max->regmap; 778 779 /* 780 * Register the regulators 781 * Turn the GPIO descriptor over to the regulator core for 782 * lifecycle management if we pass an ena_gpiod. 783 */ 784 if (config.ena_gpiod) 785 devm_gpiod_unhinge(&client->dev, config.ena_gpiod); 786 rdev = devm_regulator_register(&client->dev, &max->desc, &config); 787 if (IS_ERR(rdev)) { 788 ret = PTR_ERR(rdev); 789 dev_err(max->dev, "regulator register failed, err %d\n", ret); 790 return ret; 791 } 792 793 max8973_thermal_init(max); 794 return 0; 795 } 796 797 static const struct i2c_device_id max8973_id[] = { 798 {.name = "max8973", .driver_data = MAX8973}, 799 {.name = "max77621", .driver_data = MAX77621}, 800 {}, 801 }; 802 MODULE_DEVICE_TABLE(i2c, max8973_id); 803 804 static struct i2c_driver max8973_i2c_driver = { 805 .driver = { 806 .name = "max8973", 807 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 808 .of_match_table = of_max8973_match_tbl, 809 }, 810 .probe_new = max8973_probe, 811 .id_table = max8973_id, 812 }; 813 814 static int __init max8973_init(void) 815 { 816 return i2c_add_driver(&max8973_i2c_driver); 817 } 818 subsys_initcall(max8973_init); 819 820 static void __exit max8973_cleanup(void) 821 { 822 i2c_del_driver(&max8973_i2c_driver); 823 } 824 module_exit(max8973_cleanup); 825 826 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 827 MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); 828 MODULE_LICENSE("GPL v2"); 829