drivers/mfd/max77620.c

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This source file includes following definitions.
max77620_irq_global_mask
max77620_irq_global_unmask
max77620_get_fps_period_reg_value
max77620_config_fps
max77620_initialise_fps
max77620_read_es_version
max77620_pm_power_off
max77620_probe
max77620_set_fps_period
max77620_i2c_suspend
max77620_i2c_resume
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Maxim MAX77620 MFD Driver
   4  *
   5  * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
   6  *
   7  * Author:
   8  *      Laxman Dewangan <ldewangan@nvidia.com>
   9  *      Chaitanya Bandi <bandik@nvidia.com>
  10  *      Mallikarjun Kasoju <mkasoju@nvidia.com>
  11  */
  12 
  13 /****************** Teminology used in driver ********************
  14  * Here are some terminology used from datasheet for quick reference:
  15  * Flexible Power Sequence (FPS):
  16  * The Flexible Power Sequencer (FPS) allows each regulator to power up under
  17  * hardware or software control. Additionally, each regulator can power on
  18  * independently or among a group of other regulators with an adjustable
  19  * power-up and power-down delays (sequencing). GPIO1, GPIO2, and GPIO3 can
  20  * be programmed to be part of a sequence allowing external regulators to be
  21  * sequenced along with internal regulators. 32KHz clock can be programmed to
  22  * be part of a sequence.
  23  * There is 3 FPS confguration registers and all resources are configured to
  24  * any of these FPS or no FPS.
  25  */
  26 
  27 #include <linux/i2c.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/mfd/core.h>
  30 #include <linux/mfd/max77620.h>
  31 #include <linux/init.h>
  32 #include <linux/of.h>
  33 #include <linux/of_device.h>
  34 #include <linux/regmap.h>
  35 #include <linux/slab.h>
  36 
  37 static struct max77620_chip *max77620_scratch;
  38 
  39 static const struct resource gpio_resources[] = {
  40         DEFINE_RES_IRQ(MAX77620_IRQ_TOP_GPIO),
  41 };
  42 
  43 static const struct resource power_resources[] = {
  44         DEFINE_RES_IRQ(MAX77620_IRQ_LBT_MBATLOW),
  45 };
  46 
  47 static const struct resource rtc_resources[] = {
  48         DEFINE_RES_IRQ(MAX77620_IRQ_TOP_RTC),
  49 };
  50 
  51 static const struct resource thermal_resources[] = {
  52         DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM1),
  53         DEFINE_RES_IRQ(MAX77620_IRQ_LBT_TJALRM2),
  54 };
  55 
  56 static const struct regmap_irq max77620_top_irqs[] = {
  57         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GLBL, 0, MAX77620_IRQ_TOP_GLBL_MASK),
  58         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_SD, 0, MAX77620_IRQ_TOP_SD_MASK),
  59         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_LDO, 0, MAX77620_IRQ_TOP_LDO_MASK),
  60         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_GPIO, 0, MAX77620_IRQ_TOP_GPIO_MASK),
  61         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_RTC, 0, MAX77620_IRQ_TOP_RTC_MASK),
  62         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_32K, 0, MAX77620_IRQ_TOP_32K_MASK),
  63         REGMAP_IRQ_REG(MAX77620_IRQ_TOP_ONOFF, 0, MAX77620_IRQ_TOP_ONOFF_MASK),
  64         REGMAP_IRQ_REG(MAX77620_IRQ_LBT_MBATLOW, 1, MAX77620_IRQ_LBM_MASK),
  65         REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM1, 1, MAX77620_IRQ_TJALRM1_MASK),
  66         REGMAP_IRQ_REG(MAX77620_IRQ_LBT_TJALRM2, 1, MAX77620_IRQ_TJALRM2_MASK),
  67 };
  68 
  69 static const struct mfd_cell max77620_children[] = {
  70         { .name = "max77620-pinctrl", },
  71         { .name = "max77620-clock", },
  72         { .name = "max77620-pmic", },
  73         { .name = "max77620-watchdog", },
  74         {
  75                 .name = "max77620-gpio",
  76                 .resources = gpio_resources,
  77                 .num_resources = ARRAY_SIZE(gpio_resources),
  78         }, {
  79                 .name = "max77620-rtc",
  80                 .resources = rtc_resources,
  81                 .num_resources = ARRAY_SIZE(rtc_resources),
  82         }, {
  83                 .name = "max77620-power",
  84                 .resources = power_resources,
  85                 .num_resources = ARRAY_SIZE(power_resources),
  86         }, {
  87                 .name = "max77620-thermal",
  88                 .resources = thermal_resources,
  89                 .num_resources = ARRAY_SIZE(thermal_resources),
  90         },
  91 };
  92 
  93 static const struct mfd_cell max20024_children[] = {
  94         { .name = "max20024-pinctrl", },
  95         { .name = "max77620-clock", },
  96         { .name = "max20024-pmic", },
  97         { .name = "max77620-watchdog", },
  98         {
  99                 .name = "max77620-gpio",
 100                 .resources = gpio_resources,
 101                 .num_resources = ARRAY_SIZE(gpio_resources),
 102         }, {
 103                 .name = "max77620-rtc",
 104                 .resources = rtc_resources,
 105                 .num_resources = ARRAY_SIZE(rtc_resources),
 106         }, {
 107                 .name = "max20024-power",
 108                 .resources = power_resources,
 109                 .num_resources = ARRAY_SIZE(power_resources),
 110         },
 111 };
 112 
 113 static const struct mfd_cell max77663_children[] = {
 114         { .name = "max77620-pinctrl", },
 115         { .name = "max77620-clock", },
 116         { .name = "max77663-pmic", },
 117         { .name = "max77620-watchdog", },
 118         {
 119                 .name = "max77620-gpio",
 120                 .resources = gpio_resources,
 121                 .num_resources = ARRAY_SIZE(gpio_resources),
 122         }, {
 123                 .name = "max77620-rtc",
 124                 .resources = rtc_resources,
 125                 .num_resources = ARRAY_SIZE(rtc_resources),
 126         }, {
 127                 .name = "max77663-power",
 128                 .resources = power_resources,
 129                 .num_resources = ARRAY_SIZE(power_resources),
 130         },
 131 };
 132 
 133 static const struct regmap_range max77620_readable_ranges[] = {
 134         regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
 135 };
 136 
 137 static const struct regmap_access_table max77620_readable_table = {
 138         .yes_ranges = max77620_readable_ranges,
 139         .n_yes_ranges = ARRAY_SIZE(max77620_readable_ranges),
 140 };
 141 
 142 static const struct regmap_range max20024_readable_ranges[] = {
 143         regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
 144         regmap_reg_range(MAX20024_REG_MAX_ADD, MAX20024_REG_MAX_ADD),
 145 };
 146 
 147 static const struct regmap_access_table max20024_readable_table = {
 148         .yes_ranges = max20024_readable_ranges,
 149         .n_yes_ranges = ARRAY_SIZE(max20024_readable_ranges),
 150 };
 151 
 152 static const struct regmap_range max77620_writable_ranges[] = {
 153         regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_DVSSD4),
 154 };
 155 
 156 static const struct regmap_access_table max77620_writable_table = {
 157         .yes_ranges = max77620_writable_ranges,
 158         .n_yes_ranges = ARRAY_SIZE(max77620_writable_ranges),
 159 };
 160 
 161 static const struct regmap_range max77620_cacheable_ranges[] = {
 162         regmap_reg_range(MAX77620_REG_SD0_CFG, MAX77620_REG_LDO_CFG3),
 163         regmap_reg_range(MAX77620_REG_FPS_CFG0, MAX77620_REG_FPS_SD3),
 164 };
 165 
 166 static const struct regmap_access_table max77620_volatile_table = {
 167         .no_ranges = max77620_cacheable_ranges,
 168         .n_no_ranges = ARRAY_SIZE(max77620_cacheable_ranges),
 169 };
 170 
 171 static const struct regmap_config max77620_regmap_config = {
 172         .name = "power-slave",
 173         .reg_bits = 8,
 174         .val_bits = 8,
 175         .max_register = MAX77620_REG_DVSSD4 + 1,
 176         .cache_type = REGCACHE_RBTREE,
 177         .rd_table = &max77620_readable_table,
 178         .wr_table = &max77620_writable_table,
 179         .volatile_table = &max77620_volatile_table,
 180 };
 181 
 182 static const struct regmap_config max20024_regmap_config = {
 183         .name = "power-slave",
 184         .reg_bits = 8,
 185         .val_bits = 8,
 186         .max_register = MAX20024_REG_MAX_ADD + 1,
 187         .cache_type = REGCACHE_RBTREE,
 188         .rd_table = &max20024_readable_table,
 189         .wr_table = &max77620_writable_table,
 190         .volatile_table = &max77620_volatile_table,
 191 };
 192 
 193 static const struct regmap_range max77663_readable_ranges[] = {
 194         regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_CID5),
 195 };
 196 
 197 static const struct regmap_access_table max77663_readable_table = {
 198         .yes_ranges = max77663_readable_ranges,
 199         .n_yes_ranges = ARRAY_SIZE(max77663_readable_ranges),
 200 };
 201 
 202 static const struct regmap_range max77663_writable_ranges[] = {
 203         regmap_reg_range(MAX77620_REG_CNFGGLBL1, MAX77620_REG_CID5),
 204 };
 205 
 206 static const struct regmap_access_table max77663_writable_table = {
 207         .yes_ranges = max77663_writable_ranges,
 208         .n_yes_ranges = ARRAY_SIZE(max77663_writable_ranges),
 209 };
 210 
 211 static const struct regmap_config max77663_regmap_config = {
 212         .name = "power-slave",
 213         .reg_bits = 8,
 214         .val_bits = 8,
 215         .max_register = MAX77620_REG_CID5 + 1,
 216         .cache_type = REGCACHE_RBTREE,
 217         .rd_table = &max77663_readable_table,
 218         .wr_table = &max77663_writable_table,
 219         .volatile_table = &max77620_volatile_table,
 220 };
 221 
 222 /*
 223  * MAX77620 and MAX20024 has the following steps of the interrupt handling
 224  * for TOP interrupts:
 225  * 1. When interrupt occurs from PMIC, mask the PMIC interrupt by setting GLBLM.
 226  * 2. Read IRQTOP and service the interrupt.
 227  * 3. Once all interrupts has been checked and serviced, the interrupt service
 228  *    routine un-masks the hardware interrupt line by clearing GLBLM.
 229  */
 230 static int max77620_irq_global_mask(void *irq_drv_data)
 231 {
 232         struct max77620_chip *chip = irq_drv_data;
 233         int ret;
 234 
 235         ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT,
 236                                  MAX77620_GLBLM_MASK, MAX77620_GLBLM_MASK);
 237         if (ret < 0)
 238                 dev_err(chip->dev, "Failed to set GLBLM: %d\n", ret);
 239 
 240         return ret;
 241 }
 242 
 243 static int max77620_irq_global_unmask(void *irq_drv_data)
 244 {
 245         struct max77620_chip *chip = irq_drv_data;
 246         int ret;
 247 
 248         ret = regmap_update_bits(chip->rmap, MAX77620_REG_INTENLBT,
 249                                  MAX77620_GLBLM_MASK, 0);
 250         if (ret < 0)
 251                 dev_err(chip->dev, "Failed to reset GLBLM: %d\n", ret);
 252 
 253         return ret;
 254 }
 255 
 256 static struct regmap_irq_chip max77620_top_irq_chip = {
 257         .name = "max77620-top",
 258         .irqs = max77620_top_irqs,
 259         .num_irqs = ARRAY_SIZE(max77620_top_irqs),
 260         .num_regs = 2,
 261         .status_base = MAX77620_REG_IRQTOP,
 262         .mask_base = MAX77620_REG_IRQTOPM,
 263         .handle_pre_irq = max77620_irq_global_mask,
 264         .handle_post_irq = max77620_irq_global_unmask,
 265 };
 266 
 267 /* max77620_get_fps_period_reg_value:  Get FPS bit field value from
 268  *                                     requested periods.
 269  * MAX77620 supports the FPS period of 40, 80, 160, 320, 540, 1280, 2560
 270  * and 5120 microseconds. MAX20024 supports the FPS period of 20, 40, 80,
 271  * 160, 320, 540, 1280 and 2560 microseconds.
 272  * The FPS register has 3 bits field to set the FPS period as
 273  * bits         max77620                max20024
 274  * 000          40                      20
 275  * 001          80                      40
 276  * :::
 277 */
 278 static int max77620_get_fps_period_reg_value(struct max77620_chip *chip,
 279                                              int tperiod)
 280 {
 281         int fps_min_period;
 282         int i;
 283 
 284         switch (chip->chip_id) {
 285         case MAX20024:
 286                 fps_min_period = MAX20024_FPS_PERIOD_MIN_US;
 287                 break;
 288         case MAX77620:
 289                 fps_min_period = MAX77620_FPS_PERIOD_MIN_US;
 290                 break;
 291         case MAX77663:
 292                 fps_min_period = MAX20024_FPS_PERIOD_MIN_US;
 293                 break;
 294         default:
 295                 return -EINVAL;
 296         }
 297 
 298         for (i = 0; i < 7; i++) {
 299                 if (fps_min_period >= tperiod)
 300                         return i;
 301                 fps_min_period *= 2;
 302         }
 303 
 304         return i;
 305 }
 306 
 307 /* max77620_config_fps: Configure FPS configuration registers
 308  *                      based on platform specific information.
 309  */
 310 static int max77620_config_fps(struct max77620_chip *chip,
 311                                struct device_node *fps_np)
 312 {
 313         struct device *dev = chip->dev;
 314         unsigned int mask = 0, config = 0;
 315         u32 fps_max_period;
 316         u32 param_val;
 317         int tperiod, fps_id;
 318         int ret;
 319         char fps_name[10];
 320 
 321         switch (chip->chip_id) {
 322         case MAX20024:
 323                 fps_max_period = MAX20024_FPS_PERIOD_MAX_US;
 324                 break;
 325         case MAX77620:
 326                 fps_max_period = MAX77620_FPS_PERIOD_MAX_US;
 327                 break;
 328         case MAX77663:
 329                 fps_max_period = MAX20024_FPS_PERIOD_MAX_US;
 330                 break;
 331         default:
 332                 return -EINVAL;
 333         }
 334 
 335         for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) {
 336                 sprintf(fps_name, "fps%d", fps_id);
 337                 if (of_node_name_eq(fps_np, fps_name))
 338                         break;
 339         }
 340 
 341         if (fps_id == MAX77620_FPS_COUNT) {
 342                 dev_err(dev, "FPS node name %pOFn is not valid\n", fps_np);
 343                 return -EINVAL;
 344         }
 345 
 346         ret = of_property_read_u32(fps_np, "maxim,shutdown-fps-time-period-us",
 347                                    &param_val);
 348         if (!ret) {
 349                 mask |= MAX77620_FPS_TIME_PERIOD_MASK;
 350                 chip->shutdown_fps_period[fps_id] = min(param_val,
 351                                                         fps_max_period);
 352                 tperiod = max77620_get_fps_period_reg_value(chip,
 353                                 chip->shutdown_fps_period[fps_id]);
 354                 config |= tperiod << MAX77620_FPS_TIME_PERIOD_SHIFT;
 355         }
 356 
 357         ret = of_property_read_u32(fps_np, "maxim,suspend-fps-time-period-us",
 358                                    &param_val);
 359         if (!ret)
 360                 chip->suspend_fps_period[fps_id] = min(param_val,
 361                                                        fps_max_period);
 362 
 363         ret = of_property_read_u32(fps_np, "maxim,fps-event-source",
 364                                    &param_val);
 365         if (!ret) {
 366                 if (param_val > 2) {
 367                         dev_err(dev, "FPS%d event-source invalid\n", fps_id);
 368                         return -EINVAL;
 369                 }
 370                 mask |= MAX77620_FPS_EN_SRC_MASK;
 371                 config |= param_val << MAX77620_FPS_EN_SRC_SHIFT;
 372                 if (param_val == 2) {
 373                         mask |= MAX77620_FPS_ENFPS_SW_MASK;
 374                         config |= MAX77620_FPS_ENFPS_SW;
 375                 }
 376         }
 377 
 378         if (!chip->sleep_enable && !chip->enable_global_lpm) {
 379                 ret = of_property_read_u32(fps_np,
 380                                 "maxim,device-state-on-disabled-event",
 381                                 &param_val);
 382                 if (!ret) {
 383                         if (param_val == 0)
 384                                 chip->sleep_enable = true;
 385                         else if (param_val == 1)
 386                                 chip->enable_global_lpm = true;
 387                 }
 388         }
 389 
 390         ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id,
 391                                  mask, config);
 392         if (ret < 0) {
 393                 dev_err(dev, "Failed to update FPS CFG: %d\n", ret);
 394                 return ret;
 395         }
 396 
 397         return 0;
 398 }
 399 
 400 static int max77620_initialise_fps(struct max77620_chip *chip)
 401 {
 402         struct device *dev = chip->dev;
 403         struct device_node *fps_np, *fps_child;
 404         u8 config;
 405         int fps_id;
 406         int ret;
 407 
 408         for (fps_id = 0; fps_id < MAX77620_FPS_COUNT; fps_id++) {
 409                 chip->shutdown_fps_period[fps_id] = -1;
 410                 chip->suspend_fps_period[fps_id] = -1;
 411         }
 412 
 413         fps_np = of_get_child_by_name(dev->of_node, "fps");
 414         if (!fps_np)
 415                 goto skip_fps;
 416 
 417         for_each_child_of_node(fps_np, fps_child) {
 418                 ret = max77620_config_fps(chip, fps_child);
 419                 if (ret < 0) {
 420                         of_node_put(fps_child);
 421                         return ret;
 422                 }
 423         }
 424 
 425         config = chip->enable_global_lpm ? MAX77620_ONOFFCNFG2_SLP_LPM_MSK : 0;
 426         ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 427                                  MAX77620_ONOFFCNFG2_SLP_LPM_MSK, config);
 428         if (ret < 0) {
 429                 dev_err(dev, "Failed to update SLP_LPM: %d\n", ret);
 430                 return ret;
 431         }
 432 
 433 skip_fps:
 434         if (chip->chip_id == MAX77663)
 435                 return 0;
 436 
 437         /* Enable wake on EN0 pin */
 438         ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 439                                  MAX77620_ONOFFCNFG2_WK_EN0,
 440                                  MAX77620_ONOFFCNFG2_WK_EN0);
 441         if (ret < 0) {
 442                 dev_err(dev, "Failed to update WK_EN0: %d\n", ret);
 443                 return ret;
 444         }
 445 
 446         /* For MAX20024, SLPEN will be POR reset if CLRSE is b11 */
 447         if ((chip->chip_id == MAX20024) && chip->sleep_enable) {
 448                 config = MAX77620_ONOFFCNFG1_SLPEN | MAX20024_ONOFFCNFG1_CLRSE;
 449                 ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
 450                                          config, config);
 451                 if (ret < 0) {
 452                         dev_err(dev, "Failed to update SLPEN: %d\n", ret);
 453                         return ret;
 454                 }
 455         }
 456 
 457         return 0;
 458 }
 459 
 460 static int max77620_read_es_version(struct max77620_chip *chip)
 461 {
 462         unsigned int val;
 463         u8 cid_val[6];
 464         int i;
 465         int ret;
 466 
 467         for (i = MAX77620_REG_CID0; i <= MAX77620_REG_CID5; i++) {
 468                 ret = regmap_read(chip->rmap, i, &val);
 469                 if (ret < 0) {
 470                         dev_err(chip->dev, "Failed to read CID: %d\n", ret);
 471                         return ret;
 472                 }
 473                 dev_dbg(chip->dev, "CID%d: 0x%02x\n",
 474                         i - MAX77620_REG_CID0, val);
 475                 cid_val[i - MAX77620_REG_CID0] = val;
 476         }
 477 
 478         /* CID4 is OTP Version  and CID5 is ES version */
 479         dev_info(chip->dev, "PMIC Version OTP:0x%02X and ES:0x%X\n",
 480                  cid_val[4], MAX77620_CID5_DIDM(cid_val[5]));
 481 
 482         return ret;
 483 }
 484 
 485 static void max77620_pm_power_off(void)
 486 {
 487         struct max77620_chip *chip = max77620_scratch;
 488 
 489         regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
 490                            MAX77620_ONOFFCNFG1_SFT_RST,
 491                            MAX77620_ONOFFCNFG1_SFT_RST);
 492 }
 493 
 494 static int max77620_probe(struct i2c_client *client,
 495                           const struct i2c_device_id *id)
 496 {
 497         const struct regmap_config *rmap_config;
 498         struct max77620_chip *chip;
 499         const struct mfd_cell *mfd_cells;
 500         int n_mfd_cells;
 501         bool pm_off;
 502         int ret;
 503 
 504         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 505         if (!chip)
 506                 return -ENOMEM;
 507 
 508         i2c_set_clientdata(client, chip);
 509         chip->dev = &client->dev;
 510         chip->irq_base = -1;
 511         chip->chip_irq = client->irq;
 512         chip->chip_id = (enum max77620_chip_id)id->driver_data;
 513 
 514         switch (chip->chip_id) {
 515         case MAX77620:
 516                 mfd_cells = max77620_children;
 517                 n_mfd_cells = ARRAY_SIZE(max77620_children);
 518                 rmap_config = &max77620_regmap_config;
 519                 break;
 520         case MAX20024:
 521                 mfd_cells = max20024_children;
 522                 n_mfd_cells = ARRAY_SIZE(max20024_children);
 523                 rmap_config = &max20024_regmap_config;
 524                 break;
 525         case MAX77663:
 526                 mfd_cells = max77663_children;
 527                 n_mfd_cells = ARRAY_SIZE(max77663_children);
 528                 rmap_config = &max77663_regmap_config;
 529                 break;
 530         default:
 531                 dev_err(chip->dev, "ChipID is invalid %d\n", chip->chip_id);
 532                 return -EINVAL;
 533         }
 534 
 535         chip->rmap = devm_regmap_init_i2c(client, rmap_config);
 536         if (IS_ERR(chip->rmap)) {
 537                 ret = PTR_ERR(chip->rmap);
 538                 dev_err(chip->dev, "Failed to initialise regmap: %d\n", ret);
 539                 return ret;
 540         }
 541 
 542         ret = max77620_read_es_version(chip);
 543         if (ret < 0)
 544                 return ret;
 545 
 546         max77620_top_irq_chip.irq_drv_data = chip;
 547         ret = devm_regmap_add_irq_chip(chip->dev, chip->rmap, client->irq,
 548                                        IRQF_ONESHOT | IRQF_SHARED,
 549                                        chip->irq_base, &max77620_top_irq_chip,
 550                                        &chip->top_irq_data);
 551         if (ret < 0) {
 552                 dev_err(chip->dev, "Failed to add regmap irq: %d\n", ret);
 553                 return ret;
 554         }
 555 
 556         ret = max77620_initialise_fps(chip);
 557         if (ret < 0)
 558                 return ret;
 559 
 560         ret =  devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE,
 561                                     mfd_cells, n_mfd_cells, NULL, 0,
 562                                     regmap_irq_get_domain(chip->top_irq_data));
 563         if (ret < 0) {
 564                 dev_err(chip->dev, "Failed to add MFD children: %d\n", ret);
 565                 return ret;
 566         }
 567 
 568         pm_off = of_device_is_system_power_controller(client->dev.of_node);
 569         if (pm_off && !pm_power_off) {
 570                 max77620_scratch = chip;
 571                 pm_power_off = max77620_pm_power_off;
 572         }
 573 
 574         return 0;
 575 }
 576 
 577 #ifdef CONFIG_PM_SLEEP
 578 static int max77620_set_fps_period(struct max77620_chip *chip,
 579                                    int fps_id, int time_period)
 580 {
 581         int period = max77620_get_fps_period_reg_value(chip, time_period);
 582         int ret;
 583 
 584         ret = regmap_update_bits(chip->rmap, MAX77620_REG_FPS_CFG0 + fps_id,
 585                                  MAX77620_FPS_TIME_PERIOD_MASK,
 586                                  period << MAX77620_FPS_TIME_PERIOD_SHIFT);
 587         if (ret < 0) {
 588                 dev_err(chip->dev, "Failed to update FPS period: %d\n", ret);
 589                 return ret;
 590         }
 591 
 592         return 0;
 593 }
 594 
 595 static int max77620_i2c_suspend(struct device *dev)
 596 {
 597         struct max77620_chip *chip = dev_get_drvdata(dev);
 598         struct i2c_client *client = to_i2c_client(dev);
 599         unsigned int config;
 600         int fps;
 601         int ret;
 602 
 603         for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) {
 604                 if (chip->suspend_fps_period[fps] < 0)
 605                         continue;
 606 
 607                 ret = max77620_set_fps_period(chip, fps,
 608                                               chip->suspend_fps_period[fps]);
 609                 if (ret < 0)
 610                         return ret;
 611         }
 612 
 613         /*
 614          * For MAX20024: No need to configure SLPEN on suspend as
 615          * it will be configured on Init.
 616          */
 617         if (chip->chip_id == MAX20024)
 618                 goto out;
 619 
 620         config = (chip->sleep_enable) ? MAX77620_ONOFFCNFG1_SLPEN : 0;
 621         ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG1,
 622                                  MAX77620_ONOFFCNFG1_SLPEN,
 623                                  config);
 624         if (ret < 0) {
 625                 dev_err(dev, "Failed to configure sleep in suspend: %d\n", ret);
 626                 return ret;
 627         }
 628 
 629         if (chip->chip_id == MAX77663)
 630                 goto out;
 631 
 632         /* Disable WK_EN0 */
 633         ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 634                                  MAX77620_ONOFFCNFG2_WK_EN0, 0);
 635         if (ret < 0) {
 636                 dev_err(dev, "Failed to configure WK_EN in suspend: %d\n", ret);
 637                 return ret;
 638         }
 639 
 640 out:
 641         disable_irq(client->irq);
 642 
 643         return 0;
 644 }
 645 
 646 static int max77620_i2c_resume(struct device *dev)
 647 {
 648         struct max77620_chip *chip = dev_get_drvdata(dev);
 649         struct i2c_client *client = to_i2c_client(dev);
 650         int ret;
 651         int fps;
 652 
 653         for (fps = 0; fps < MAX77620_FPS_COUNT; fps++) {
 654                 if (chip->shutdown_fps_period[fps] < 0)
 655                         continue;
 656 
 657                 ret = max77620_set_fps_period(chip, fps,
 658                                               chip->shutdown_fps_period[fps]);
 659                 if (ret < 0)
 660                         return ret;
 661         }
 662 
 663         /*
 664          * For MAX20024: No need to configure WKEN0 on resume as
 665          * it is configured on Init.
 666          */
 667         if (chip->chip_id == MAX20024 || chip->chip_id == MAX77663)
 668                 goto out;
 669 
 670         /* Enable WK_EN0 */
 671         ret = regmap_update_bits(chip->rmap, MAX77620_REG_ONOFFCNFG2,
 672                                  MAX77620_ONOFFCNFG2_WK_EN0,
 673                                  MAX77620_ONOFFCNFG2_WK_EN0);
 674         if (ret < 0) {
 675                 dev_err(dev, "Failed to configure WK_EN0 n resume: %d\n", ret);
 676                 return ret;
 677         }
 678 
 679 out:
 680         enable_irq(client->irq);
 681 
 682         return 0;
 683 }
 684 #endif
 685 
 686 static const struct i2c_device_id max77620_id[] = {
 687         {"max77620", MAX77620},
 688         {"max20024", MAX20024},
 689         {"max77663", MAX77663},
 690         {},
 691 };
 692 
 693 static const struct dev_pm_ops max77620_pm_ops = {
 694         SET_SYSTEM_SLEEP_PM_OPS(max77620_i2c_suspend, max77620_i2c_resume)
 695 };
 696 
 697 static struct i2c_driver max77620_driver = {
 698         .driver = {
 699                 .name = "max77620",
 700                 .pm = &max77620_pm_ops,
 701         },
 702         .probe = max77620_probe,
 703         .id_table = max77620_id,
 704 };
 705 builtin_i2c_driver(max77620_driver);
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root/drivers/mfd/max77620.c

DEFINITIONS
