linux/drivers/regulator/max8973-regulator.c
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   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
 106enum device_id {
 107        MAX8973,
 108        MAX77621
 109};
 110
 111/* Maxim 8973 chip information */
 112struct 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 */
 145static 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
 162update_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
 172static 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
 187static 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
 224static 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
 252static 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
 268static 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
 295static 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
 319static 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
 344static 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
 354static 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
 473static 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
 494static 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
 504static const struct thermal_zone_of_device_ops max77621_tz_ops = {
 505        .get_temp = max8973_thermal_read_temp,
 506};
 507
 508static 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
 547static 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
 554static 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
 619static 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};
 624MODULE_DEVICE_TABLE(of, of_max8973_match_tbl);
 625
 626static 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
 818static const struct i2c_device_id max8973_id[] = {
 819        {.name = "max8973", .driver_data = MAX8973},
 820        {.name = "max77621", .driver_data = MAX77621},
 821        {},
 822};
 823MODULE_DEVICE_TABLE(i2c, max8973_id);
 824
 825static 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
 834static int __init max8973_init(void)
 835{
 836        return i2c_add_driver(&max8973_i2c_driver);
 837}
 838subsys_initcall(max8973_init);
 839
 840static void __exit max8973_cleanup(void)
 841{
 842        i2c_del_driver(&max8973_i2c_driver);
 843}
 844module_exit(max8973_cleanup);
 845
 846MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 847MODULE_DESCRIPTION("MAX8973 voltage regulator driver");
 848MODULE_LICENSE("GPL v2");
 849