814 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * max8973-regulator.c -- Maxim max8973A4 *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/consumer.h>24#include <linux/i2c.h>25#include <linux/slab.h>26#include <linux/regmap.h>27#include <linux/thermal.h>28#include <linux/irq.h>29#include <linux/interrupt.h>30 31/* Register definitions */32#define MAX8973_VOUT 0x033#define MAX8973_VOUT_DVS 0x134#define MAX8973_CONTROL1 0x235#define MAX8973_CONTROL2 0x336#define MAX8973_CHIPID1 0x437#define MAX8973_CHIPID2 0x538 39#define MAX8973_MAX_VOUT_REG 240 41/* MAX8973_VOUT */42#define MAX8973_VOUT_ENABLE BIT(7)43#define MAX8973_VOUT_MASK 0x7F44 45/* MAX8973_VOUT_DVS */46#define MAX8973_DVS_VOUT_MASK 0x7F47 48/* MAX8973_CONTROL1 */49#define MAX8973_SNS_ENABLE BIT(7)50#define MAX8973_FPWM_EN_M BIT(6)51#define MAX8973_NFSR_ENABLE BIT(5)52#define MAX8973_AD_ENABLE BIT(4)53#define MAX8973_BIAS_ENABLE BIT(3)54#define MAX8973_FREQSHIFT_9PER BIT(2)55 56#define MAX8973_RAMP_12mV_PER_US 0x057#define MAX8973_RAMP_25mV_PER_US 0x158#define MAX8973_RAMP_50mV_PER_US 0x259#define MAX8973_RAMP_200mV_PER_US 0x360#define MAX8973_RAMP_MASK 0x361 62/* MAX8973_CONTROL2 */63#define MAX8973_WDTMR_ENABLE BIT(6)64#define MAX8973_DISCH_ENBABLE BIT(5)65#define MAX8973_FT_ENABLE BIT(4)66#define MAX77621_T_JUNCTION_120 BIT(7)67 68#define MAX8973_CKKADV_TRIP_MASK 0xC69#define MAX8973_CKKADV_TRIP_DISABLE 0xC70#define MAX8973_CKKADV_TRIP_75mV_PER_US 0x071#define MAX8973_CKKADV_TRIP_150mV_PER_US 0x472#define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x873#define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x0003000074 75#define MAX8973_INDUCTOR_MIN_30_PER 0x076#define MAX8973_INDUCTOR_NOMINAL 0x177#define MAX8973_INDUCTOR_PLUS_30_PER 0x278#define MAX8973_INDUCTOR_PLUS_60_PER 0x379#define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x0030000080 81#define MAX8973_MIN_VOLATGE 60625082#define MAX8973_MAX_VOLATGE 140000083#define MAX8973_VOLATGE_STEP 625084#define MAX8973_BUCK_N_VOLTAGE 0x8085 86#define MAX77621_CHIPID_TJINT_S BIT(0)87 88#define MAX77621_NORMAL_OPERATING_TEMP 10000089#define MAX77621_TJINT_WARNING_TEMP_120 12000090#define MAX77621_TJINT_WARNING_TEMP_140 14000091 92enum device_id {93 MAX8973,94 MAX7762195};96 97/* Maxim 8973 chip information */98struct max8973_chip {99 struct device *dev;100 struct regulator_desc desc;101 struct regmap *regmap;102 bool enable_external_control;103 struct gpio_desc *dvs_gpiod;104 int lru_index[MAX8973_MAX_VOUT_REG];105 int curr_vout_val[MAX8973_MAX_VOUT_REG];106 int curr_vout_reg;107 int curr_gpio_val;108 struct regulator_ops ops;109 enum device_id id;110 int junction_temp_warning;111 int irq;112 struct thermal_zone_device *tz_device;113};114 115/*116 * find_voltage_set_register: Find new voltage configuration register (VOUT).117 * The finding of the new VOUT register will be based on the LRU mechanism.118 * Each VOUT register will have different voltage configured . This119 * Function will look if any of the VOUT register have requested voltage set120 * or not.121 * - If it is already there then it will make that register as most122 * recently used and return as found so that caller need not to set123 * the VOUT register but need to set the proper gpios to select this124 * VOUT register.125 * - If requested voltage is not found then it will use the least126 * recently mechanism to get new VOUT register for new configuration127 * and will return not_found so that caller need to set new VOUT128 * register and then gpios (both).129 */130static bool find_voltage_set_register(struct max8973_chip *tps,131 int req_vsel, int *vout_reg, int *gpio_val)132{133 int i;134 bool found = false;135 int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1];136 int found_index = MAX8973_MAX_VOUT_REG - 1;137 138 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) {139 if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) {140 new_vout_reg = tps->lru_index[i];141 found_index = i;142 found = true;143 goto update_lru_index;144 }145 }146 147update_lru_index:148 for (i = found_index; i > 0; i--)149 tps->lru_index[i] = tps->lru_index[i - 1];150 151 tps->lru_index[0] = new_vout_reg;152 *gpio_val = new_vout_reg;153 *vout_reg = MAX8973_VOUT + new_vout_reg;154 return found;155}156 157static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev)158{159 struct max8973_chip *max = rdev_get_drvdata(rdev);160 unsigned int data;161 int ret;162 163 ret = regmap_read(max->regmap, max->curr_vout_reg, &data);164 if (ret < 0) {165 dev_err(max->dev, "register %d read failed, err = %d\n",166 max->curr_vout_reg, ret);167 return ret;168 }169 return data & MAX8973_VOUT_MASK;170}171 172static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev,173 unsigned vsel)174{175 struct max8973_chip *max = rdev_get_drvdata(rdev);176 int ret;177 bool found = false;178 int vout_reg = max->curr_vout_reg;179 int gpio_val = max->curr_gpio_val;180 181 /*182 * If gpios are available to select the VOUT register then least183 * recently used register for new configuration.184 */185 if (max->dvs_gpiod)186 found = find_voltage_set_register(max, vsel,187 &vout_reg, &gpio_val);188 189 if (!found) {190 ret = regmap_update_bits(max->regmap, vout_reg,191 MAX8973_VOUT_MASK, vsel);192 if (ret < 0) {193 dev_err(max->dev, "register %d update failed, err %d\n",194 vout_reg, ret);195 return ret;196 }197 max->curr_vout_reg = vout_reg;198 max->curr_vout_val[gpio_val] = vsel;199 }200 201 /* Select proper VOUT register vio gpios */202 if (max->dvs_gpiod) {203 gpiod_set_value_cansleep(max->dvs_gpiod, gpio_val & 0x1);204 max->curr_gpio_val = gpio_val;205 }206 return 0;207}208 209static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)210{211 struct max8973_chip *max = rdev_get_drvdata(rdev);212 int ret;213 int pwm;214 215 /* Enable force PWM mode in FAST mode only. */216 switch (mode) {217 case REGULATOR_MODE_FAST:218 pwm = MAX8973_FPWM_EN_M;219 break;220 221 case REGULATOR_MODE_NORMAL:222 pwm = 0;223 break;224 225 default:226 return -EINVAL;227 }228 229 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,230 MAX8973_FPWM_EN_M, pwm);231 if (ret < 0)232 dev_err(max->dev, "register %d update failed, err %d\n",233 MAX8973_CONTROL1, ret);234 return ret;235}236 237static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev)238{239 struct max8973_chip *max = rdev_get_drvdata(rdev);240 unsigned int data;241 int ret;242 243 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);244 if (ret < 0) {245 dev_err(max->dev, "register %d read failed, err %d\n",246 MAX8973_CONTROL1, ret);247 return ret;248 }249 return (data & MAX8973_FPWM_EN_M) ?250 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;251}252 253static int max8973_set_current_limit(struct regulator_dev *rdev,254 int min_ua, int max_ua)255{256 struct max8973_chip *max = rdev_get_drvdata(rdev);257 unsigned int val;258 int ret;259 260 if (max_ua <= 9000000)261 val = MAX8973_CKKADV_TRIP_75mV_PER_US;262 else if (max_ua <= 12000000)263 val = MAX8973_CKKADV_TRIP_150mV_PER_US;264 else265 val = MAX8973_CKKADV_TRIP_DISABLE;266 267 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2,268 MAX8973_CKKADV_TRIP_MASK, val);269 if (ret < 0) {270 dev_err(max->dev, "register %d update failed: %d\n",271 MAX8973_CONTROL2, ret);272 return ret;273 }274 return 0;275}276 277static int max8973_get_current_limit(struct regulator_dev *rdev)278{279 struct max8973_chip *max = rdev_get_drvdata(rdev);280 unsigned int control2;281 int ret;282 283 ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2);284 if (ret < 0) {285 dev_err(max->dev, "register %d read failed: %d\n",286 MAX8973_CONTROL2, ret);287 return ret;288 }289 switch (control2 & MAX8973_CKKADV_TRIP_MASK) {290 case MAX8973_CKKADV_TRIP_DISABLE:291 return 15000000;292 case MAX8973_CKKADV_TRIP_150mV_PER_US:293 return 12000000;294 case MAX8973_CKKADV_TRIP_75mV_PER_US:295 return 9000000;296 default:297 break;298 }299 return 9000000;300}301 302static const unsigned int max8973_buck_ramp_table[] = {303 12000, 25000, 50000, 200000304};305 306static const struct regulator_ops max8973_dcdc_ops = {307 .get_voltage_sel = max8973_dcdc_get_voltage_sel,308 .set_voltage_sel = max8973_dcdc_set_voltage_sel,309 .list_voltage = regulator_list_voltage_linear,310 .set_mode = max8973_dcdc_set_mode,311 .get_mode = max8973_dcdc_get_mode,312 .set_voltage_time_sel = regulator_set_voltage_time_sel,313 .set_ramp_delay = regulator_set_ramp_delay_regmap,314};315 316static int max8973_init_dcdc(struct max8973_chip *max,317 struct max8973_regulator_platform_data *pdata)318{319 int ret;320 uint8_t control1 = 0;321 uint8_t control2 = 0;322 unsigned int data;323 324 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);325 if (ret < 0) {326 dev_err(max->dev, "register %d read failed, err = %d",327 MAX8973_CONTROL1, ret);328 return ret;329 }330 control1 = data & MAX8973_RAMP_MASK;331 switch (control1) {332 case MAX8973_RAMP_12mV_PER_US:333 max->desc.ramp_delay = 12000;334 break;335 case MAX8973_RAMP_25mV_PER_US:336 max->desc.ramp_delay = 25000;337 break;338 case MAX8973_RAMP_50mV_PER_US:339 max->desc.ramp_delay = 50000;340 break;341 case MAX8973_RAMP_200mV_PER_US:342 max->desc.ramp_delay = 200000;343 break;344 }345 346 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)347 control1 |= MAX8973_SNS_ENABLE;348 349 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE))350 control1 |= MAX8973_NFSR_ENABLE;351 352 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE)353 control1 |= MAX8973_AD_ENABLE;354 355 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) {356 control1 |= MAX8973_BIAS_ENABLE;357 max->desc.enable_time = 20;358 } else {359 max->desc.enable_time = 240;360 }361 362 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)363 control1 |= MAX8973_FREQSHIFT_9PER;364 365 if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) &&366 (max->id == MAX77621))367 control2 |= MAX77621_T_JUNCTION_120;368 369 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))370 control2 |= MAX8973_DISCH_ENBABLE;371 372 /* Clock advance trip configuration */373 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) {374 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED:375 control2 |= MAX8973_CKKADV_TRIP_DISABLE;376 break;377 378 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US:379 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US;380 break;381 382 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US:383 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US;384 break;385 386 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS:387 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS;388 break;389 }390 391 /* Configure inductor value */392 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) {393 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL:394 control2 |= MAX8973_INDUCTOR_NOMINAL;395 break;396 397 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER:398 control2 |= MAX8973_INDUCTOR_MIN_30_PER;399 break;400 401 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER:402 control2 |= MAX8973_INDUCTOR_PLUS_30_PER;403 break;404 405 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER:406 control2 |= MAX8973_INDUCTOR_PLUS_60_PER;407 break;408 }409 410 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1);411 if (ret < 0) {412 dev_err(max->dev, "register %d write failed, err = %d",413 MAX8973_CONTROL1, ret);414 return ret;415 }416 417 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);418 if (ret < 0) {419 dev_err(max->dev, "register %d write failed, err = %d",420 MAX8973_CONTROL2, ret);421 return ret;422 }423 424 /* If external control is enabled then disable EN bit */425 if (max->enable_external_control && (max->id == MAX8973)) {426 ret = regmap_update_bits(max->regmap, MAX8973_VOUT,427 MAX8973_VOUT_ENABLE, 0);428 if (ret < 0)429 dev_err(max->dev, "register %d update failed, err = %d",430 MAX8973_VOUT, ret);431 }432 return ret;433}434 435static int max8973_thermal_read_temp(struct thermal_zone_device *tz, int *temp)436{437 struct max8973_chip *mchip = thermal_zone_device_priv(tz);438 unsigned int val;439 int ret;440 441 ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val);442 if (ret < 0) {443 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret);444 return ret;445 }446 447 /* +1 degC to trigger cool device */448 if (val & MAX77621_CHIPID_TJINT_S)449 *temp = mchip->junction_temp_warning + 1000;450 else451 *temp = MAX77621_NORMAL_OPERATING_TEMP;452 453 return 0;454}455 456static irqreturn_t max8973_thermal_irq(int irq, void *data)457{458 struct max8973_chip *mchip = data;459 460 thermal_zone_device_update(mchip->tz_device,461 THERMAL_EVENT_UNSPECIFIED);462 463 return IRQ_HANDLED;464}465 466static const struct thermal_zone_device_ops max77621_tz_ops = {467 .get_temp = max8973_thermal_read_temp,468};469 470static int max8973_thermal_init(struct max8973_chip *mchip)471{472 struct thermal_zone_device *tzd;473 unsigned long irq_flags;474 int ret;475 476 if (mchip->id != MAX77621)477 return 0;478 479 tzd = devm_thermal_of_zone_register(mchip->dev, 0, mchip,480 &max77621_tz_ops);481 if (IS_ERR(tzd)) {482 ret = PTR_ERR(tzd);483 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n",484 ret);485 return ret;486 }487 488 if (mchip->irq <= 0)489 return 0;490 491 irq_flags = irq_get_trigger_type(mchip->irq);492 493 ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL,494 max8973_thermal_irq,495 IRQF_ONESHOT | IRQF_SHARED | irq_flags,496 dev_name(mchip->dev), mchip);497 if (ret < 0) {498 dev_err(mchip->dev, "Failed to request irq %d, %d\n",499 mchip->irq, ret);500 return ret;501 }502 503 return 0;504}505 506static const struct regmap_config max8973_regmap_config = {507 .reg_bits = 8,508 .val_bits = 8,509 .max_register = MAX8973_CHIPID2,510 .cache_type = REGCACHE_MAPLE,511};512 513static struct max8973_regulator_platform_data *max8973_parse_dt(514 struct device *dev)515{516 struct max8973_regulator_platform_data *pdata;517 struct device_node *np = dev->of_node;518 int ret;519 u32 pval;520 bool etr_enable;521 bool etr_sensitivity_high;522 523 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);524 if (!pdata)525 return NULL;526 527 pdata->enable_ext_control = of_property_read_bool(np,528 "maxim,externally-enable");529 530 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);531 if (!ret)532 pdata->dvs_def_state = pval;533 534 if (of_property_read_bool(np, "maxim,enable-remote-sense"))535 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE;536 537 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate"))538 pdata->control_flags |=539 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE;540 541 if (of_property_read_bool(np, "maxim,enable-active-discharge"))542 pdata->control_flags |=543 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE;544 545 if (of_property_read_bool(np, "maxim,enable-frequency-shift"))546 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE;547 548 if (of_property_read_bool(np, "maxim,enable-bias-control"))549 pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE;550 551 etr_enable = of_property_read_bool(np, "maxim,enable-etr");552 etr_sensitivity_high = of_property_read_bool(np,553 "maxim,enable-high-etr-sensitivity");554 if (etr_sensitivity_high)555 etr_enable = true;556 557 if (etr_enable) {558 if (etr_sensitivity_high)559 pdata->control_flags |=560 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US;561 else562 pdata->control_flags |=563 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US;564 } else {565 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED;566 }567 568 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140;569 ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval);570 if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120))571 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120;572 573 return pdata;574}575 576static const struct of_device_id of_max8973_match_tbl[] = {577 { .compatible = "maxim,max8973", .data = (void *)MAX8973, },578 { .compatible = "maxim,max77621", .data = (void *)MAX77621, },579 { },580};581MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);582 583static int max8973_probe(struct i2c_client *client)584{585 const struct i2c_device_id *id = i2c_client_get_device_id(client);586 struct max8973_regulator_platform_data *pdata;587 struct regulator_init_data *ridata;588 struct regulator_config config = { };589 struct regulator_dev *rdev;590 struct max8973_chip *max;591 bool pdata_from_dt = false;592 unsigned int chip_id;593 struct gpio_desc *gpiod;594 enum gpiod_flags gflags;595 int ret;596 597 pdata = dev_get_platdata(&client->dev);598 599 if (!pdata && client->dev.of_node) {600 pdata = max8973_parse_dt(&client->dev);601 pdata_from_dt = true;602 }603 604 if (!pdata) {605 dev_err(&client->dev, "No Platform data");606 return -EIO;607 }608 609 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);610 if (!max)611 return -ENOMEM;612 613 max->dvs_gpiod = devm_gpiod_get_optional(&client->dev, "maxim,dvs",614 (pdata->dvs_def_state) ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);615 if (IS_ERR(max->dvs_gpiod))616 return dev_err_probe(&client->dev, PTR_ERR(max->dvs_gpiod),617 "failed to obtain dvs gpio\n");618 gpiod_set_consumer_name(max->dvs_gpiod, "max8973-dvs");619 620 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);621 if (IS_ERR(max->regmap)) {622 ret = PTR_ERR(max->regmap);623 dev_err(&client->dev, "regmap init failed, err %d\n", ret);624 return ret;625 }626 627 if (client->dev.of_node) {628 const struct of_device_id *match;629 630 match = of_match_device(of_match_ptr(of_max8973_match_tbl),631 &client->dev);632 if (!match)633 return -ENODATA;634 max->id = (u32)((uintptr_t)match->data);635 } else {636 max->id = id->driver_data;637 }638 639 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id);640 if (ret < 0) {641 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret);642 return ret;643 }644 645 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n",646 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7);647 648 i2c_set_clientdata(client, max);649 max->ops = max8973_dcdc_ops;650 max->dev = &client->dev;651 max->desc.name = id->name;652 max->desc.id = 0;653 max->desc.ops = &max->ops;654 max->desc.type = REGULATOR_VOLTAGE;655 max->desc.owner = THIS_MODULE;656 max->desc.min_uV = MAX8973_MIN_VOLATGE;657 max->desc.uV_step = MAX8973_VOLATGE_STEP;658 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;659 max->desc.ramp_reg = MAX8973_CONTROL1;660 max->desc.ramp_mask = MAX8973_RAMP_MASK;661 max->desc.ramp_delay_table = max8973_buck_ramp_table;662 max->desc.n_ramp_values = ARRAY_SIZE(max8973_buck_ramp_table);663 664 max->enable_external_control = pdata->enable_ext_control;665 max->curr_gpio_val = pdata->dvs_def_state;666 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;667 max->junction_temp_warning = pdata->junction_temp_warning;668 669 max->lru_index[0] = max->curr_vout_reg;670 671 if (max->dvs_gpiod) {672 int i;673 674 /*675 * Initialize the lru index with vout_reg id676 * The index 0 will be most recently used and677 * set with the max->curr_vout_reg */678 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)679 max->lru_index[i] = i;680 max->lru_index[0] = max->curr_vout_reg;681 max->lru_index[max->curr_vout_reg] = 0;682 } else {683 /*684 * If there is no DVS GPIO, the VOUT register685 * address is fixed.686 */687 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap;688 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap;689 max->desc.vsel_reg = max->curr_vout_reg;690 max->desc.vsel_mask = MAX8973_VOUT_MASK;691 }692 693 if (pdata_from_dt)694 pdata->reg_init_data = of_get_regulator_init_data(&client->dev,695 client->dev.of_node, &max->desc);696 697 ridata = pdata->reg_init_data;698 switch (max->id) {699 case MAX8973:700 if (!pdata->enable_ext_control) {701 max->desc.enable_reg = MAX8973_VOUT;702 max->desc.enable_mask = MAX8973_VOUT_ENABLE;703 max->ops.enable = regulator_enable_regmap;704 max->ops.disable = regulator_disable_regmap;705 max->ops.is_enabled = regulator_is_enabled_regmap;706 break;707 }708 709 if (ridata && (ridata->constraints.always_on ||710 ridata->constraints.boot_on))711 gflags = GPIOD_OUT_HIGH;712 else713 gflags = GPIOD_OUT_LOW;714 gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;715 gpiod = devm_gpiod_get_optional(&client->dev,716 "maxim,enable",717 gflags);718 if (IS_ERR(gpiod))719 return PTR_ERR(gpiod);720 if (gpiod) {721 config.ena_gpiod = gpiod;722 max->enable_external_control = true;723 }724 725 break;726 727 case MAX77621:728 /*729 * We do not let the core switch this regulator on/off,730 * we just leave it on.731 */732 gpiod = devm_gpiod_get_optional(&client->dev,733 "maxim,enable",734 GPIOD_OUT_HIGH);735 if (IS_ERR(gpiod))736 return PTR_ERR(gpiod);737 if (gpiod)738 max->enable_external_control = true;739 740 max->desc.enable_reg = MAX8973_VOUT;741 max->desc.enable_mask = MAX8973_VOUT_ENABLE;742 max->ops.enable = regulator_enable_regmap;743 max->ops.disable = regulator_disable_regmap;744 max->ops.is_enabled = regulator_is_enabled_regmap;745 max->ops.set_current_limit = max8973_set_current_limit;746 max->ops.get_current_limit = max8973_get_current_limit;747 break;748 default:749 break;750 }751 752 ret = max8973_init_dcdc(max, pdata);753 if (ret < 0) {754 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);755 return ret;756 }757 758 config.dev = &client->dev;759 config.init_data = pdata->reg_init_data;760 config.driver_data = max;761 config.of_node = client->dev.of_node;762 config.regmap = max->regmap;763 764 /*765 * Register the regulators766 * Turn the GPIO descriptor over to the regulator core for767 * lifecycle management if we pass an ena_gpiod.768 */769 if (config.ena_gpiod)770 devm_gpiod_unhinge(&client->dev, config.ena_gpiod);771 rdev = devm_regulator_register(&client->dev, &max->desc, &config);772 if (IS_ERR(rdev)) {773 ret = PTR_ERR(rdev);774 dev_err(max->dev, "regulator register failed, err %d\n", ret);775 return ret;776 }777 778 max8973_thermal_init(max);779 return 0;780}781 782static const struct i2c_device_id max8973_id[] = {783 {.name = "max8973", .driver_data = MAX8973},784 {.name = "max77621", .driver_data = MAX77621},785 {},786};787MODULE_DEVICE_TABLE(i2c, max8973_id);788 789static struct i2c_driver max8973_i2c_driver = {790 .driver = {791 .name = "max8973",792 .probe_type = PROBE_PREFER_ASYNCHRONOUS,793 .of_match_table = of_max8973_match_tbl,794 },795 .probe = max8973_probe,796 .id_table = max8973_id,797};798 799static int __init max8973_init(void)800{801 return i2c_add_driver(&max8973_i2c_driver);802}803subsys_initcall(max8973_init);804 805static void __exit max8973_cleanup(void)806{807 i2c_del_driver(&max8973_i2c_driver);808}809module_exit(max8973_cleanup);810 811MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");812MODULE_DESCRIPTION("MAX8973 voltage regulator driver");813MODULE_LICENSE("GPL v2");814