drivers/regulator/max8973-regulator.c

   1 /*
   2  * max8973-regulator.c -- Maxim max8973
   3  *
   4  * Regulator driver for MAXIM 8973 DC-DC step-down switching regulator.
   5  *
   6  * Copyright (c) 2012, NVIDIA Corporation.
   7  *
   8  * Author: Laxman Dewangan <ldewangan@nvidia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation version 2.
  13  *
  14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  15  * whether express or implied; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22  * 02111-1307, USA
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/err.h>
  29 #include <linux/of.h>
  30 #include <linux/of_device.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/regulator/driver.h>
  33 #include <linux/regulator/machine.h>
  34 #include <linux/regulator/max8973-regulator.h>
  35 #include <linux/regulator/of_regulator.h>
  36 #include <linux/gpio.h>
  37 #include <linux/of_gpio.h>
  38 #include <linux/i2c.h>
  39 #include <linux/slab.h>
  40 #include <linux/regmap.h>
  41 #include <linux/thermal.h>
  42 #include <linux/irq.h>
  43 #include <linux/interrupt.h>
  44
  45 /* Register definitions */
  46 #define MAX8973_VOUT                                    0x0
  47 #define MAX8973_VOUT_DVS                                0x1
  48 #define MAX8973_CONTROL1                                0x2
  49 #define MAX8973_CONTROL2                                0x3
  50 #define MAX8973_CHIPID1                                 0x4
  51 #define MAX8973_CHIPID2                                 0x5
  52
  53 #define MAX8973_MAX_VOUT_REG                            2
  54
  55 /* MAX8973_VOUT */
  56 #define MAX8973_VOUT_ENABLE                             BIT(7)
  57 #define MAX8973_VOUT_MASK                               0x7F
  58
  59 /* MAX8973_VOUT_DVS */
  60 #define MAX8973_DVS_VOUT_MASK                           0x7F
  61
  62 /* MAX8973_CONTROL1 */
  63 #define MAX8973_SNS_ENABLE                              BIT(7)
  64 #define MAX8973_FPWM_EN_M                               BIT(6)
  65 #define MAX8973_NFSR_ENABLE                             BIT(5)
  66 #define MAX8973_AD_ENABLE                               BIT(4)
  67 #define MAX8973_BIAS_ENABLE                             BIT(3)
  68 #define MAX8973_FREQSHIFT_9PER                          BIT(2)
  69
  70 #define MAX8973_RAMP_12mV_PER_US                        0x0
  71 #define MAX8973_RAMP_25mV_PER_US                        0x1
  72 #define MAX8973_RAMP_50mV_PER_US                        0x2
  73 #define MAX8973_RAMP_200mV_PER_US                       0x3
  74 #define MAX8973_RAMP_MASK                               0x3
  75
  76 /* MAX8973_CONTROL2 */
  77 #define MAX8973_WDTMR_ENABLE                            BIT(6)
  78 #define MAX8973_DISCH_ENBABLE                           BIT(5)
  79 #define MAX8973_FT_ENABLE                               BIT(4)
  80 #define MAX77621_T_JUNCTION_120                         BIT(7)
  81
  82 #define MAX8973_CKKADV_TRIP_MASK                        0xC
  83 #define MAX8973_CKKADV_TRIP_DISABLE                     0xC
  84 #define MAX8973_CKKADV_TRIP_75mV_PER_US                 0x0
  85 #define MAX8973_CKKADV_TRIP_150mV_PER_US                0x4
  86 #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS        0x8
  87 #define MAX8973_CONTROL_CLKADV_TRIP_MASK                0x00030000
  88
  89 #define MAX8973_INDUCTOR_MIN_30_PER                     0x0
  90 #define MAX8973_INDUCTOR_NOMINAL                        0x1
  91 #define MAX8973_INDUCTOR_PLUS_30_PER                    0x2
  92 #define MAX8973_INDUCTOR_PLUS_60_PER                    0x3
  93 #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK             0x00300000
  94
  95 #define MAX8973_MIN_VOLATGE                             606250
  96 #define MAX8973_MAX_VOLATGE                             1400000
  97 #define MAX8973_VOLATGE_STEP                            6250
  98 #define MAX8973_BUCK_N_VOLTAGE                          0x80
  99
 100 #define MAX77621_CHIPID_TJINT_S                         BIT(0)
 101
 102 #define MAX77621_NORMAL_OPERATING_TEMP                  100000
 103 #define MAX77621_TJINT_WARNING_TEMP_120                 120000
 104 #define MAX77621_TJINT_WARNING_TEMP_140                 140000
 105
 106 enum device_id {
 107         MAX8973,
 108         MAX77621
 109 };
 110
 111 /* Maxim 8973 chip information */
 112 struct max8973_chip {
 113         struct device *dev;
 114         struct regulator_desc desc;
 115         struct regmap *regmap;
 116         bool enable_external_control;
 117         int enable_gpio;
 118         int dvs_gpio;
 119         int lru_index[MAX8973_MAX_VOUT_REG];
 120         int curr_vout_val[MAX8973_MAX_VOUT_REG];
 121         int curr_vout_reg;
 122         int curr_gpio_val;
 123         struct regulator_ops ops;
 124         enum device_id id;
 125         int junction_temp_warning;
 126         int irq;
 127         struct thermal_zone_device *tz_device;
 128 };
 129
 130 /*
 131  * find_voltage_set_register: Find new voltage configuration register (VOUT).
 132  * The finding of the new VOUT register will be based on the LRU mechanism.
 133  * Each VOUT register will have different voltage configured . This
 134  * Function will look if any of the VOUT register have requested voltage set
 135  * or not.
 136  *     - If it is already there then it will make that register as most
 137  *       recently used and return as found so that caller need not to set
 138  *       the VOUT register but need to set the proper gpios to select this
 139  *       VOUT register.
 140  *     - If requested voltage is not found then it will use the least
 141  *       recently mechanism to get new VOUT register for new configuration
 142  *       and will return not_found so that caller need to set new VOUT
 143  *       register and then gpios (both).
 144  */
 145 static bool find_voltage_set_register(struct max8973_chip *tps,
 146                 int req_vsel, int *vout_reg, int *gpio_val)
 147 {
 148         int i;
 149         bool found = false;
 150         int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1];
 151         int found_index = MAX8973_MAX_VOUT_REG - 1;
 152
 153         for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) {
 154                 if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) {
 155                         new_vout_reg = tps->lru_index[i];
 156                         found_index = i;
 157                         found = true;
 158                         goto update_lru_index;
 159                 }
 160         }
 161
 162 update_lru_index:
 163         for (i = found_index; i > 0; i--)
 164                 tps->lru_index[i] = tps->lru_index[i - 1];
 165
 166         tps->lru_index[0] = new_vout_reg;
 167         *gpio_val = new_vout_reg;
 168         *vout_reg = MAX8973_VOUT + new_vout_reg;
 169         return found;
 170 }
 171
 172 static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev)
 173 {
 174         struct max8973_chip *max = rdev_get_drvdata(rdev);
 175         unsigned int data;
 176         int ret;
 177
 178         ret = regmap_read(max->regmap, max->curr_vout_reg, &data);
 179         if (ret < 0) {
 180                 dev_err(max->dev, "register %d read failed, err = %d\n",
 181                         max->curr_vout_reg, ret);
 182                 return ret;
 183         }
 184         return data & MAX8973_VOUT_MASK;
 185 }
 186
 187 static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev,
 188              unsigned vsel)
 189 {
 190         struct max8973_chip *max = rdev_get_drvdata(rdev);
 191         int ret;
 192         bool found = false;
 193         int vout_reg = max->curr_vout_reg;
 194         int gpio_val = max->curr_gpio_val;
 195
 196         /*
 197          * If gpios are available to select the VOUT register then least
 198          * recently used register for new configuration.
 199          */
 200         if (gpio_is_valid(max->dvs_gpio))
 201                 found = find_voltage_set_register(max, vsel,
 202                                         &vout_reg, &gpio_val);
 203
 204         if (!found) {
 205                 ret = regmap_update_bits(max->regmap, vout_reg,
 206                                         MAX8973_VOUT_MASK, vsel);
 207                 if (ret < 0) {
 208                         dev_err(max->dev, "register %d update failed, err %d\n",
 209                                  vout_reg, ret);
 210                         return ret;
 211                 }
 212                 max->curr_vout_reg = vout_reg;
 213                 max->curr_vout_val[gpio_val] = vsel;
 214         }
 215
 216         /* Select proper VOUT register vio gpios */
 217         if (gpio_is_valid(max->dvs_gpio)) {
 218                 gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1);
 219                 max->curr_gpio_val = gpio_val;
 220         }
 221         return 0;
 222 }
 223
 224 static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 225 {
 226         struct max8973_chip *max = rdev_get_drvdata(rdev);
 227         int ret;
 228         int pwm;
 229
 230         /* Enable force PWM mode in FAST mode only. */
 231         switch (mode) {
 232         case REGULATOR_MODE_FAST:
 233                 pwm = MAX8973_FPWM_EN_M;
 234                 break;
 235
 236         case REGULATOR_MODE_NORMAL:
 237                 pwm = 0;
 238                 break;
 239
 240         default:
 241                 return -EINVAL;
 242         }
 243
 244         ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
 245                                 MAX8973_FPWM_EN_M, pwm);
 246         if (ret < 0)
 247                 dev_err(max->dev, "register %d update failed, err %d\n",
 248                                 MAX8973_CONTROL1, ret);
 249         return ret;
 250 }
 251
 252 static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev)
 253 {
 254         struct max8973_chip *max = rdev_get_drvdata(rdev);
 255         unsigned int data;
 256         int ret;
 257
 258         ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
 259         if (ret < 0) {
 260                 dev_err(max->dev, "register %d read failed, err %d\n",
 261                                 MAX8973_CONTROL1, ret);
 262                 return ret;
 263         }
 264         return (data & MAX8973_FPWM_EN_M) ?
 265                 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
 266 }
 267
 268 static int max8973_set_ramp_delay(struct regulator_dev *rdev,
 269                 int ramp_delay)
 270 {
 271         struct max8973_chip *max = rdev_get_drvdata(rdev);
 272         unsigned int control;
 273         int ret;
 274
 275         /* Set ramp delay */
 276         if (ramp_delay <= 12000)
 277                 control = MAX8973_RAMP_12mV_PER_US;
 278         else if (ramp_delay <= 25000)
 279                 control = MAX8973_RAMP_25mV_PER_US;
 280         else if (ramp_delay <= 50000)
 281                 control = MAX8973_RAMP_50mV_PER_US;
 282         else if (ramp_delay <= 200000)
 283                 control = MAX8973_RAMP_200mV_PER_US;
 284         else
 285                 return -EINVAL;
 286
 287         ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
 288                         MAX8973_RAMP_MASK, control);
 289         if (ret < 0)
 290                 dev_err(max->dev, "register %d update failed, %d",
 291                                 MAX8973_CONTROL1, ret);
 292         return ret;
 293 }
 294
 295 static int max8973_set_current_limit(struct regulator_dev *rdev,
 296                 int min_ua, int max_ua)
 297 {
 298         struct max8973_chip *max = rdev_get_drvdata(rdev);
 299         unsigned int val;
 300         int ret;
 301
 302         if (max_ua <= 9000000)
 303                 val = MAX8973_CKKADV_TRIP_75mV_PER_US;
 304         else if (max_ua <= 12000000)
 305                 val = MAX8973_CKKADV_TRIP_150mV_PER_US;
 306         else
 307                 val = MAX8973_CKKADV_TRIP_DISABLE;
 308
 309         ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2,
 310                         MAX8973_CKKADV_TRIP_MASK, val);
 311         if (ret < 0) {
 312                 dev_err(max->dev, "register %d update failed: %d\n",
 313                                 MAX8973_CONTROL2, ret);
 314                 return ret;
 315         }
 316         return 0;
 317 }
 318
 319 static int max8973_get_current_limit(struct regulator_dev *rdev)
 320 {
 321         struct max8973_chip *max = rdev_get_drvdata(rdev);
 322         unsigned int control2;
 323         int ret;
 324
 325         ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2);
 326         if (ret < 0) {
 327                 dev_err(max->dev, "register %d read failed: %d\n",
 328                                 MAX8973_CONTROL2, ret);
 329                 return ret;
 330         }
 331         switch (control2 & MAX8973_CKKADV_TRIP_MASK) {
 332         case MAX8973_CKKADV_TRIP_DISABLE:
 333                 return 15000000;
 334         case MAX8973_CKKADV_TRIP_150mV_PER_US:
 335                 return 12000000;
 336         case MAX8973_CKKADV_TRIP_75mV_PER_US:
 337                 return 9000000;
 338         default:
 339                 break;
 340         }
 341         return 9000000;
 342 }
 343
 344 static const struct regulator_ops max8973_dcdc_ops = {
 345         .get_voltage_sel        = max8973_dcdc_get_voltage_sel,
 346         .set_voltage_sel        = max8973_dcdc_set_voltage_sel,
 347         .list_voltage           = regulator_list_voltage_linear,
 348         .set_mode               = max8973_dcdc_set_mode,
 349         .get_mode               = max8973_dcdc_get_mode,
 350         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 351         .set_ramp_delay         = max8973_set_ramp_delay,
 352 };
 353
 354 static int max8973_init_dcdc(struct max8973_chip *max,
 355                              struct max8973_regulator_platform_data *pdata)
 356 {
 357         int ret;
 358         uint8_t control1 = 0;
 359         uint8_t control2 = 0;
 360         unsigned int data;
 361
 362         ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
 363         if (ret < 0) {
 364                 dev_err(max->dev, "register %d read failed, err = %d",
 365                                 MAX8973_CONTROL1, ret);
 366                 return ret;
 367         }
 368         control1 = data & MAX8973_RAMP_MASK;
 369         switch (control1) {
 370         case MAX8973_RAMP_12mV_PER_US:
 371                 max->desc.ramp_delay = 12000;
 372                 break;
 373         case MAX8973_RAMP_25mV_PER_US:
 374                 max->desc.ramp_delay = 25000;
 375                 break;
 376         case MAX8973_RAMP_50mV_PER_US:
 377                 max->desc.ramp_delay = 50000;
 378                 break;
 379         case MAX8973_RAMP_200mV_PER_US:
 380                 max->desc.ramp_delay = 200000;
 381                 break;
 382         }
 383
 384         if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)
 385                 control1 |= MAX8973_SNS_ENABLE;
 386
 387         if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE))
 388                 control1 |= MAX8973_NFSR_ENABLE;
 389
 390         if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE)
 391                 control1 |= MAX8973_AD_ENABLE;
 392
 393         if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) {
 394                 control1 |= MAX8973_BIAS_ENABLE;
 395                 max->desc.enable_time = 20;
 396         } else {
 397                 max->desc.enable_time = 240;
 398         }
 399
 400         if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
 401                 control1 |= MAX8973_FREQSHIFT_9PER;
 402
 403         if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) &&
 404             (max->id == MAX77621))
 405                 control2 |= MAX77621_T_JUNCTION_120;
 406
 407         if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))
 408                 control2 |= MAX8973_DISCH_ENBABLE;
 409
 410         /*  Clock advance trip configuration */
 411         switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) {
 412         case MAX8973_CONTROL_CLKADV_TRIP_DISABLED:
 413                 control2 |= MAX8973_CKKADV_TRIP_DISABLE;
 414                 break;
 415
 416         case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US:
 417                 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US;
 418                 break;
 419
 420         case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US:
 421                 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US;
 422                 break;
 423
 424         case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS:
 425                 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS;
 426                 break;
 427         }
 428
 429         /* Configure inductor value */
 430         switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) {
 431         case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL:
 432                 control2 |= MAX8973_INDUCTOR_NOMINAL;
 433                 break;
 434
 435         case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER:
 436                 control2 |= MAX8973_INDUCTOR_MIN_30_PER;
 437                 break;
 438
 439         case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER:
 440                 control2 |= MAX8973_INDUCTOR_PLUS_30_PER;
 441                 break;
 442
 443         case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER:
 444                 control2 |= MAX8973_INDUCTOR_PLUS_60_PER;
 445                 break;
 446         }
 447
 448         ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1);
 449         if (ret < 0) {
 450                 dev_err(max->dev, "register %d write failed, err = %d",
 451                                 MAX8973_CONTROL1, ret);
 452                 return ret;
 453         }
 454
 455         ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2);
 456         if (ret < 0) {
 457                 dev_err(max->dev, "register %d write failed, err = %d",
 458                                 MAX8973_CONTROL2, ret);
 459                 return ret;
 460         }
 461
 462         /* If external control is enabled then disable EN bit */
 463         if (max->enable_external_control && (max->id == MAX8973)) {
 464                 ret = regmap_update_bits(max->regmap, MAX8973_VOUT,
 465                                                 MAX8973_VOUT_ENABLE, 0);
 466                 if (ret < 0)
 467                         dev_err(max->dev, "register %d update failed, err = %d",
 468                                 MAX8973_VOUT, ret);
 469         }
 470         return ret;
 471 }
 472
 473 static int max8973_thermal_read_temp(void *data, int *temp)
 474 {
 475         struct max8973_chip *mchip = data;
 476         unsigned int val;
 477         int ret;
 478
 479         ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val);
 480         if (ret < 0) {
 481                 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret);
 482                 return ret;
 483         }
 484
 485         /* +1 degC to trigger cool devive */
 486         if (val & MAX77621_CHIPID_TJINT_S)
 487                 *temp = mchip->junction_temp_warning + 1000;
 488         else
 489                 *temp = MAX77621_NORMAL_OPERATING_TEMP;
 490
 491         return 0;
 492 }
 493
 494 static irqreturn_t max8973_thermal_irq(int irq, void *data)
 495 {
 496         struct max8973_chip *mchip = data;
 497
 498         thermal_zone_device_update(mchip->tz_device,
 499                                    THERMAL_EVENT_UNSPECIFIED);
 500
 501         return IRQ_HANDLED;
 502 }
 503
 504 static const struct thermal_zone_of_device_ops max77621_tz_ops = {
 505         .get_temp = max8973_thermal_read_temp,
 506 };
 507
 508 static int max8973_thermal_init(struct max8973_chip *mchip)
 509 {
 510         struct thermal_zone_device *tzd;
 511         struct irq_data *irq_data;
 512         unsigned long irq_flags = 0;
 513         int ret;
 514
 515         if (mchip->id != MAX77621)
 516                 return 0;
 517
 518         tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip,
 519                                                    &max77621_tz_ops);
 520         if (IS_ERR(tzd)) {
 521                 ret = PTR_ERR(tzd);
 522                 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n",
 523                         ret);
 524                 return ret;
 525         }
 526
 527         if (mchip->irq <= 0)
 528                 return 0;
 529
 530         irq_data = irq_get_irq_data(mchip->irq);
 531         if (irq_data)
 532                 irq_flags = irqd_get_trigger_type(irq_data);
 533
 534         ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL,
 535                                         max8973_thermal_irq,
 536                                         IRQF_ONESHOT | IRQF_SHARED | irq_flags,
 537                                         dev_name(mchip->dev), mchip);
 538         if (ret < 0) {
 539                 dev_err(mchip->dev, "Failed to request irq %d, %d\n",
 540                         mchip->irq, ret);
 541                 return ret;
 542         }
 543
 544         return 0;
 545 }
 546
 547 static const struct regmap_config max8973_regmap_config = {
 548         .reg_bits               = 8,
 549         .val_bits               = 8,
 550         .max_register           = MAX8973_CHIPID2,
 551         .cache_type             = REGCACHE_RBTREE,
 552 };
 553
 554 static struct max8973_regulator_platform_data *max8973_parse_dt(
 555                 struct device *dev)
 556 {
 557         struct max8973_regulator_platform_data *pdata;
 558         struct device_node *np = dev->of_node;
 559         int ret;
 560         u32 pval;
 561         bool etr_enable;
 562         bool etr_sensitivity_high;
 563
 564         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 565         if (!pdata)
 566                 return NULL;
 567
 568         pdata->enable_ext_control = of_property_read_bool(np,
 569                                                 "maxim,externally-enable");
 570         pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0);
 571         pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0);
 572
 573         ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval);
 574         if (!ret)
 575                 pdata->dvs_def_state = pval;
 576
 577         if (of_property_read_bool(np, "maxim,enable-remote-sense"))
 578                 pdata->control_flags  |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE;
 579
 580         if (of_property_read_bool(np, "maxim,enable-falling-slew-rate"))
 581                 pdata->control_flags  |=
 582                                 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE;
 583
 584         if (of_property_read_bool(np, "maxim,enable-active-discharge"))
 585                 pdata->control_flags  |=
 586                                 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE;
 587
 588         if (of_property_read_bool(np, "maxim,enable-frequency-shift"))
 589                 pdata->control_flags  |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE;
 590
 591         if (of_property_read_bool(np, "maxim,enable-bias-control"))
 592                 pdata->control_flags  |= MAX8973_CONTROL_BIAS_ENABLE;
 593
 594         etr_enable = of_property_read_bool(np, "maxim,enable-etr");
 595         etr_sensitivity_high = of_property_read_bool(np,
 596                                 "maxim,enable-high-etr-sensitivity");
 597         if (etr_sensitivity_high)
 598                 etr_enable = true;
 599
 600         if (etr_enable) {
 601                 if (etr_sensitivity_high)
 602                         pdata->control_flags |=
 603                                 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US;
 604                 else
 605                         pdata->control_flags |=
 606                                 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US;
 607         } else {
 608                 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED;
 609         }
 610
 611         pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140;
 612         ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval);
 613         if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120))
 614                 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120;
 615
 616         return pdata;
 617 }
 618
 619 static const struct of_device_id of_max8973_match_tbl[] = {
 620         { .compatible = "maxim,max8973", .data = (void *)MAX8973, },
 621         { .compatible = "maxim,max77621", .data = (void *)MAX77621, },
 622         { },
 623 };
 624 MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);
 625
 626 static int max8973_probe(struct i2c_client *client,
 627                          const struct i2c_device_id *id)
 628 {
 629         struct max8973_regulator_platform_data *pdata;
 630         struct regulator_init_data *ridata;
 631         struct regulator_config config = { };
 632         struct regulator_dev *rdev;
 633         struct max8973_chip *max;
 634         bool pdata_from_dt = false;
 635         unsigned int chip_id;
 636         int ret;
 637
 638         pdata = dev_get_platdata(&client->dev);
 639
 640         if (!pdata && client->dev.of_node) {
 641                 pdata = max8973_parse_dt(&client->dev);
 642                 pdata_from_dt = true;
 643         }
 644
 645         if (!pdata) {
 646                 dev_err(&client->dev, "No Platform data");
 647                 return -EIO;
 648         }
 649
 650         if ((pdata->dvs_gpio == -EPROBE_DEFER) ||
 651                 (pdata->enable_gpio == -EPROBE_DEFER))
 652                 return -EPROBE_DEFER;
 653
 654         max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL);
 655         if (!max)
 656                 return -ENOMEM;
 657
 658         max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config);
 659         if (IS_ERR(max->regmap)) {
 660                 ret = PTR_ERR(max->regmap);
 661                 dev_err(&client->dev, "regmap init failed, err %d\n", ret);
 662                 return ret;
 663         }
 664
 665         if (client->dev.of_node) {
 666                 const struct of_device_id *match;
 667
 668                 match = of_match_device(of_match_ptr(of_max8973_match_tbl),
 669                                 &client->dev);
 670                 if (!match)
 671                         return -ENODATA;
 672                 max->id = (u32)((uintptr_t)match->data);
 673         } else {
 674                 max->id = id->driver_data;
 675         }
 676
 677         ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id);
 678         if (ret < 0) {
 679                 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret);
 680                 return ret;
 681         }
 682
 683         dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n",
 684                         (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7);
 685
 686         i2c_set_clientdata(client, max);
 687         max->ops = max8973_dcdc_ops;
 688         max->dev = &client->dev;
 689         max->desc.name = id->name;
 690         max->desc.id = 0;
 691         max->desc.ops = &max->ops;
 692         max->desc.type = REGULATOR_VOLTAGE;
 693         max->desc.owner = THIS_MODULE;
 694         max->desc.min_uV = MAX8973_MIN_VOLATGE;
 695         max->desc.uV_step = MAX8973_VOLATGE_STEP;
 696         max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
 697
 698         max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL;
 699         max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL;
 700         max->enable_external_control = pdata->enable_ext_control;
 701         max->curr_gpio_val = pdata->dvs_def_state;
 702         max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
 703         max->junction_temp_warning = pdata->junction_temp_warning;
 704
 705         if (gpio_is_valid(max->enable_gpio))
 706                 max->enable_external_control = true;
 707
 708         max->lru_index[0] = max->curr_vout_reg;
 709
 710         if (gpio_is_valid(max->dvs_gpio)) {
 711                 int gpio_flags;
 712                 int i;
 713
 714                 gpio_flags = (pdata->dvs_def_state) ?
 715                                 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
 716                 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio,
 717                                 gpio_flags, "max8973-dvs");
 718                 if (ret) {
 719                         dev_err(&client->dev,
 720                                 "gpio_request for gpio %d failed, err = %d\n",
 721                                 max->dvs_gpio, ret);
 722                         return ret;
 723                 }
 724
 725                 /*
 726                  * Initialize the lru index with vout_reg id
 727                  * The index 0 will be most recently used and
 728                  * set with the max->curr_vout_reg */
 729                 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i)
 730                         max->lru_index[i] = i;
 731                 max->lru_index[0] = max->curr_vout_reg;
 732                 max->lru_index[max->curr_vout_reg] = 0;
 733         } else {
 734                 /*
 735                  * If there is no DVS GPIO, the VOUT register
 736                  * address is fixed.
 737                  */
 738                 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap;
 739                 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap;
 740                 max->desc.vsel_reg = max->curr_vout_reg;
 741                 max->desc.vsel_mask = MAX8973_VOUT_MASK;
 742         }
 743
 744         if (pdata_from_dt)
 745                 pdata->reg_init_data = of_get_regulator_init_data(&client->dev,
 746                                         client->dev.of_node, &max->desc);
 747
 748         ridata = pdata->reg_init_data;
 749         switch (max->id) {
 750         case MAX8973:
 751                 if (!pdata->enable_ext_control) {
 752                         max->desc.enable_reg = MAX8973_VOUT;
 753                         max->desc.enable_mask = MAX8973_VOUT_ENABLE;
 754                         max->ops.enable = regulator_enable_regmap;
 755                         max->ops.disable = regulator_disable_regmap;
 756                         max->ops.is_enabled = regulator_is_enabled_regmap;
 757                         break;
 758                 }
 759
 760                 if (gpio_is_valid(max->enable_gpio)) {
 761                         config.ena_gpio_flags = GPIOF_OUT_INIT_LOW;
 762                         if (ridata && (ridata->constraints.always_on ||
 763                                         ridata->constraints.boot_on))
 764                                 config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
 765                         config.ena_gpio = max->enable_gpio;
 766                 }
 767                 break;
 768
 769         case MAX77621:
 770                 if (gpio_is_valid(max->enable_gpio)) {
 771                         ret = devm_gpio_request_one(&client->dev,
 772                                         max->enable_gpio, GPIOF_OUT_INIT_HIGH,
 773                                         "max8973-en-gpio");
 774                         if (ret) {
 775                                 dev_err(&client->dev,
 776                                         "gpio_request for gpio %d failed: %d\n",
 777                                         max->enable_gpio, ret);
 778                                 return ret;
 779                         }
 780                 }
 781
 782                 max->desc.enable_reg = MAX8973_VOUT;
 783                 max->desc.enable_mask = MAX8973_VOUT_ENABLE;
 784                 max->ops.enable = regulator_enable_regmap;
 785                 max->ops.disable = regulator_disable_regmap;
 786                 max->ops.is_enabled = regulator_is_enabled_regmap;
 787                 max->ops.set_current_limit = max8973_set_current_limit;
 788                 max->ops.get_current_limit = max8973_get_current_limit;
 789                 break;
 790         default:
 791                 break;
 792         }
 793
 794         ret = max8973_init_dcdc(max, pdata);
 795         if (ret < 0) {
 796                 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
 797                 return ret;
 798         }
 799
 800         config.dev = &client->dev;
 801         config.init_data = pdata->reg_init_data;
 802         config.driver_data = max;
 803         config.of_node = client->dev.of_node;
 804         config.regmap = max->regmap;
 805
 806         /* Register the regulators */
 807         rdev = devm_regulator_register(&client->dev, &max->desc, &config);
 808         if (IS_ERR(rdev)) {
 809                 ret = PTR_ERR(rdev);
 810                 dev_err(max->dev, "regulator register failed, err %d\n", ret);
 811                 return ret;
 812         }
 813
 814         max8973_thermal_init(max);
 815         return 0;
 816 }
 817
 818 static const struct i2c_device_id max8973_id[] = {
 819         {.name = "max8973", .driver_data = MAX8973},
 820         {.name = "max77621", .driver_data = MAX77621},
 821         {},
 822 };
 823 MODULE_DEVICE_TABLE(i2c, max8973_id);
 824
 825 static struct i2c_driver max8973_i2c_driver = {
 826         .driver = {
 827                 .name = "max8973",
 828                 .of_match_table = of_max8973_match_tbl,
 829         },
 830         .probe = max8973_probe,
 831         .id_table = max8973_id,
 832 };
 833
 834 static int __init max8973_init(void)
 835 {
 836         return i2c_add_driver(&max8973_i2c_driver);
 837 }
 838 subsys_initcall(max8973_init);
 839
 840 static void __exit max8973_cleanup(void)
 841 {
 842         i2c_del_driver(&max8973_i2c_driver);
 843 }
 844 module_exit(max8973_cleanup);
 845
 846 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 847 MODULE_DESCRIPTION("MAX8973 voltage regulator driver");
 848 MODULE_LICENSE("GPL v2");