drivers/regulator/da9121-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // DA9121 Single-channel dual-phase 10A buck converter
   4 //
   5 // Copyright (C) 2020 Axis Communications AB
   6 //
   7 // DA9130 Single-channel dual-phase 10A buck converter (Automotive)
   8 // DA9217 Single-channel dual-phase  6A buck converter
   9 // DA9122 Dual-channel single-phase  5A buck converter
  10 // DA9131 Dual-channel single-phase  5A buck converter (Automotive)
  11 // DA9220 Dual-channel single-phase  3A buck converter
  12 // DA9132 Dual-channel single-phase  3A buck converter (Automotive)
  13 //
  14 // Copyright (C) 2020 Dialog Semiconductor
  15
  16 #include <linux/of_device.h>
  17 #include <linux/of_gpio.h>
  18 #include <linux/gpio/consumer.h>
  19 #include <linux/regulator/of_regulator.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/module.h>
  23 #include <linux/regmap.h>
  24 #include <linux/err.h>
  25 #include <linux/i2c.h>
  26 #include <linux/regulator/da9121.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/workqueue.h>
  29
  30 #include "da9121-regulator.h"
  31
  32 /* Chip data */
  33 struct da9121 {
  34         struct device *dev;
  35         struct delayed_work work;
  36         struct da9121_pdata *pdata;
  37         struct regmap *regmap;
  38         struct regulator_dev *rdev[DA9121_IDX_MAX];
  39         unsigned int persistent[2];
  40         unsigned int passive_delay;
  41         int chip_irq;
  42         int variant_id;
  43         int subvariant_id;
  44 };
  45
  46 /* Define ranges for different variants, enabling translation to/from
  47  * registers. Maximums give scope to allow for transients.
  48  */
  49 struct da9121_range {
  50         int val_min;
  51         int val_max;
  52         int val_stp;
  53         int reg_min;
  54         int reg_max;
  55 };
  56
  57 static struct da9121_range da9121_10A_2phase_current = {
  58         .val_min =  7000000,
  59         .val_max = 20000000,
  60         .val_stp =  1000000,
  61         .reg_min = 1,
  62         .reg_max = 14,
  63 };
  64
  65 static struct da9121_range da9121_6A_2phase_current = {
  66         .val_min =  7000000,
  67         .val_max = 12000000,
  68         .val_stp =  1000000,
  69         .reg_min = 1,
  70         .reg_max = 6,
  71 };
  72
  73 static struct da9121_range da9121_5A_1phase_current = {
  74         .val_min =  3500000,
  75         .val_max = 10000000,
  76         .val_stp =   500000,
  77         .reg_min = 1,
  78         .reg_max = 14,
  79 };
  80
  81 static struct da9121_range da9121_3A_1phase_current = {
  82         .val_min = 3500000,
  83         .val_max = 6000000,
  84         .val_stp =  500000,
  85         .reg_min = 1,
  86         .reg_max = 6,
  87 };
  88
  89 static struct da9121_range da914x_40A_4phase_current = {
  90         .val_min = 14000000,
  91         .val_max = 80000000,
  92         .val_stp =  2000000,
  93         .reg_min = 1,
  94         .reg_max = 14,
  95 };
  96
  97 static struct da9121_range da914x_20A_2phase_current = {
  98         .val_min =  7000000,
  99         .val_max = 40000000,
 100         .val_stp =  2000000,
 101         .reg_min = 1,
 102         .reg_max = 14,
 103 };
 104
 105 struct da9121_variant_info {
 106         int num_bucks;
 107         int num_phases;
 108         struct da9121_range *current_range;
 109 };
 110
 111 static const struct da9121_variant_info variant_parameters[] = {
 112         { 1, 2, &da9121_10A_2phase_current },   //DA9121_TYPE_DA9121_DA9130
 113         { 2, 1, &da9121_3A_1phase_current  },   //DA9121_TYPE_DA9220_DA9132
 114         { 2, 1, &da9121_5A_1phase_current  },   //DA9121_TYPE_DA9122_DA9131
 115         { 1, 2, &da9121_6A_2phase_current  },   //DA9121_TYPE_DA9217
 116         { 1, 4, &da914x_40A_4phase_current },   //DA9121_TYPE_DA9141
 117         { 1, 2, &da914x_20A_2phase_current },   //DA9121_TYPE_DA9142
 118 };
 119
 120 struct da9121_field {
 121         unsigned int reg;
 122         unsigned int msk;
 123 };
 124
 125 static const struct da9121_field da9121_current_field[2] = {
 126         { DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
 127         { DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
 128 };
 129
 130 static const struct da9121_field da9121_mode_field[2] = {
 131         { DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
 132         { DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
 133 };
 134
 135 struct status_event_data {
 136         int buck_id; /* 0=core, 1/2-buck */
 137         int reg_index;  /* index for status/event/mask register selection */
 138         int status_bit; /* bit masks... */
 139         int event_bit;
 140         int mask_bit;
 141         unsigned long notification; /* Notification for status inception */
 142         char *warn; /* if NULL, notify - otherwise dev_warn this string */
 143 };
 144
 145 #define DA9121_STATUS(id, bank, name, notification, warning) \
 146         { id, bank, \
 147         DA9121_MASK_SYS_STATUS_##bank##_##name, \
 148         DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
 149         DA9121_MASK_SYS_MASK_##bank##_M_##name, \
 150         notification, warning }
 151
 152 /* For second buck related event bits that are specific to DA9122, DA9220 variants */
 153 #define DA9xxx_STATUS(id, bank, name, notification, warning) \
 154         { id, bank, \
 155         DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
 156         DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
 157         DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
 158         notification, warning }
 159
 160 /* The status signals that may need servicing, depending on device variant.
 161  * After assertion, they persist; so event is notified, the IRQ disabled,
 162  * and status polled until clear again and IRQ is reenabled.
 163  *
 164  * SG/PG1/PG2 should be set when device first powers up and should never
 165  * re-occur. When this driver starts, it is expected that these will have
 166  * self-cleared for when the IRQs are enabled, so these should never be seen.
 167  * If seen, the implication is that the device has reset.
 168  *
 169  * GPIO0/1/2 are not configured for use by default, so should not be seen.
 170  */
 171 static const struct status_event_data status_event_handling[] = {
 172         DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
 173         DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
 174         DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
 175         DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
 176         DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
 177         DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
 178         DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
 179         DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
 180         DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
 181         DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
 182         DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
 183         DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
 184         DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
 185         DA9121_STATUS(0, 2, GPIO2, 0, "Handled E_GPIO2\n"),
 186 };
 187
 188 static int da9121_get_current_limit(struct regulator_dev *rdev)
 189 {
 190         struct da9121 *chip = rdev_get_drvdata(rdev);
 191         int id = rdev_get_id(rdev);
 192         struct da9121_range *range =
 193                 variant_parameters[chip->variant_id].current_range;
 194         unsigned int val = 0;
 195         int ret = 0;
 196
 197         ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
 198         if (ret < 0) {
 199                 dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
 200                 goto error;
 201         }
 202
 203         if (val < range->reg_min) {
 204                 ret = -EACCES;
 205                 goto error;
 206         }
 207
 208         if (val > range->reg_max) {
 209                 ret = -EINVAL;
 210                 goto error;
 211         }
 212
 213         return range->val_min + (range->val_stp * (val - range->reg_min));
 214 error:
 215         return ret;
 216 }
 217
 218 static int da9121_ceiling_selector(struct regulator_dev *rdev,
 219                 int min, int max,
 220                 unsigned int *selector)
 221 {
 222         struct da9121 *chip = rdev_get_drvdata(rdev);
 223         struct da9121_range *range =
 224                 variant_parameters[chip->variant_id].current_range;
 225         unsigned int level;
 226         unsigned int i = 0;
 227         unsigned int sel = 0;
 228         int ret = 0;
 229
 230         if (range->val_min > max || range->val_max < min) {
 231                 dev_err(chip->dev,
 232                         "Requested current out of regulator capability\n");
 233                 ret = -EINVAL;
 234                 goto error;
 235         }
 236
 237         level = range->val_max;
 238         for (i = range->reg_max; i >= range->reg_min; i--) {
 239                 if (level <= max) {
 240                         sel = i;
 241                         break;
 242                 }
 243                 level -= range->val_stp;
 244         }
 245
 246         if (level < min) {
 247                 dev_err(chip->dev,
 248                         "Best match falls below minimum requested current\n");
 249                 ret = -EINVAL;
 250                 goto error;
 251         }
 252
 253         *selector = sel;
 254 error:
 255         return ret;
 256 }
 257
 258 static int da9121_set_current_limit(struct regulator_dev *rdev,
 259                                 int min_ua, int max_ua)
 260 {
 261         struct da9121 *chip = rdev_get_drvdata(rdev);
 262         int id = rdev_get_id(rdev);
 263         struct da9121_range *range =
 264                 variant_parameters[chip->variant_id].current_range;
 265         unsigned int sel = 0;
 266         int ret = 0;
 267
 268         if (min_ua < range->val_min ||
 269             max_ua > range->val_max) {
 270                 ret = -EINVAL;
 271                 goto error;
 272         }
 273
 274         if (rdev->desc->ops->is_enabled(rdev)) {
 275                 ret = -EBUSY;
 276                 goto error;
 277         }
 278
 279         ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
 280         if (ret < 0)
 281                 goto error;
 282
 283         ret = regmap_update_bits(chip->regmap,
 284                                 da9121_current_field[id].reg,
 285                                 da9121_current_field[id].msk,
 286                                 (unsigned int)sel);
 287         if (ret < 0)
 288                 dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
 289
 290 error:
 291         return ret;
 292 }
 293
 294 static unsigned int da9121_map_mode(unsigned int mode)
 295 {
 296         switch (mode) {
 297         case DA9121_BUCK_MODE_FORCE_PWM:
 298                 return REGULATOR_MODE_FAST;
 299         case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
 300                 return REGULATOR_MODE_NORMAL;
 301         case DA9121_BUCK_MODE_AUTO:
 302                 return REGULATOR_MODE_IDLE;
 303         case DA9121_BUCK_MODE_FORCE_PFM:
 304                 return REGULATOR_MODE_STANDBY;
 305         default:
 306                 return REGULATOR_MODE_INVALID;
 307         }
 308 }
 309
 310 static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
 311 {
 312         struct da9121 *chip = rdev_get_drvdata(rdev);
 313         int id = rdev_get_id(rdev);
 314         unsigned int val;
 315
 316         switch (mode) {
 317         case REGULATOR_MODE_FAST:
 318                 val = DA9121_BUCK_MODE_FORCE_PWM;
 319                 break;
 320         case REGULATOR_MODE_NORMAL:
 321                 val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
 322                 break;
 323         case REGULATOR_MODE_IDLE:
 324                 val = DA9121_BUCK_MODE_AUTO;
 325                 break;
 326         case REGULATOR_MODE_STANDBY:
 327                 val = DA9121_BUCK_MODE_FORCE_PFM;
 328                 break;
 329         default:
 330                 return -EINVAL;
 331         }
 332
 333         return regmap_update_bits(chip->regmap,
 334                                   da9121_mode_field[id].reg,
 335                                   da9121_mode_field[id].msk,
 336                                   val);
 337 }
 338
 339 static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
 340 {
 341         struct da9121 *chip = rdev_get_drvdata(rdev);
 342         int id = rdev_get_id(rdev);
 343         unsigned int val, mode;
 344         int ret = 0;
 345
 346         ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
 347         if (ret < 0) {
 348                 dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
 349                 return -EINVAL;
 350         }
 351
 352         mode = da9121_map_mode(val & da9121_mode_field[id].msk);
 353         if (mode == REGULATOR_MODE_INVALID)
 354                 return -EINVAL;
 355
 356         return mode;
 357 }
 358
 359 static const struct regulator_ops da9121_buck_ops = {
 360         .enable = regulator_enable_regmap,
 361         .disable = regulator_disable_regmap,
 362         .is_enabled = regulator_is_enabled_regmap,
 363         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 364         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 365         .list_voltage = regulator_list_voltage_linear,
 366         .get_current_limit = da9121_get_current_limit,
 367         .set_current_limit = da9121_set_current_limit,
 368         .set_mode = da9121_buck_set_mode,
 369         .get_mode = da9121_buck_get_mode,
 370 };
 371
 372 static struct of_regulator_match da9121_matches[] = {
 373         [DA9121_IDX_BUCK1] = { .name = "buck1" },
 374         [DA9121_IDX_BUCK2] = { .name = "buck2" },
 375 };
 376
 377 static int da9121_of_parse_cb(struct device_node *np,
 378                                 const struct regulator_desc *desc,
 379                                 struct regulator_config *config)
 380 {
 381         struct da9121 *chip = config->driver_data;
 382         struct da9121_pdata *pdata;
 383         struct gpio_desc *ena_gpiod;
 384
 385         if (chip->pdata == NULL) {
 386                 pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
 387                 if (!pdata)
 388                         return -ENOMEM;
 389         } else {
 390                 pdata = chip->pdata;
 391         }
 392
 393         pdata->num_buck++;
 394
 395         if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
 396                 dev_err(chip->dev, "Error: excessive regulators for device\n");
 397                 return -ENODEV;
 398         }
 399
 400         ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
 401                                                 GPIOD_OUT_HIGH |
 402                                                 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
 403                                                 "da9121-enable");
 404         if (!IS_ERR(ena_gpiod))
 405                 config->ena_gpiod = ena_gpiod;
 406
 407         if (variant_parameters[chip->variant_id].num_bucks == 2) {
 408                 uint32_t ripple_cancel;
 409                 uint32_t ripple_reg;
 410                 int ret;
 411
 412                 if (of_property_read_u32(da9121_matches[pdata->num_buck-1].of_node,
 413                                 "dlg,ripple-cancel", &ripple_cancel)) {
 414                         if (pdata->num_buck > 1)
 415                                 ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
 416                         else
 417                                 ripple_reg = DA9121_REG_BUCK_BUCK1_7;
 418
 419                         ret = regmap_update_bits(chip->regmap, ripple_reg,
 420                                 DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
 421                                 ripple_cancel);
 422                         if (ret < 0)
 423                                 dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
 424                 }
 425         }
 426
 427         return 0;
 428 }
 429
 430 #define DA9121_MIN_MV           300
 431 #define DA9121_MAX_MV           1900
 432 #define DA9121_STEP_MV          10
 433 #define DA9121_MIN_SEL          (DA9121_MIN_MV / DA9121_STEP_MV)
 434 #define DA9121_N_VOLTAGES       (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
 435                                  + 1 + DA9121_MIN_SEL)
 436
 437 static const struct regulator_desc da9121_reg = {
 438         .id = DA9121_IDX_BUCK1,
 439         .name = "da9121",
 440         .of_match = "buck1",
 441         .of_parse_cb = da9121_of_parse_cb,
 442         .owner = THIS_MODULE,
 443         .regulators_node = of_match_ptr("regulators"),
 444         .of_map_mode = da9121_map_mode,
 445         .ops = &da9121_buck_ops,
 446         .type = REGULATOR_VOLTAGE,
 447         .n_voltages = DA9121_N_VOLTAGES,
 448         .min_uV = DA9121_MIN_MV * 1000,
 449         .uV_step = DA9121_STEP_MV * 1000,
 450         .linear_min_sel = DA9121_MIN_SEL,
 451         .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 452         .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 453         .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 454         .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 455         /* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
 456         .ramp_delay = 20000,
 457         /* tBUCK_EN */
 458         .enable_time = 20,
 459 };
 460
 461 static const struct regulator_desc da9220_reg[2] = {
 462         {
 463                 .id = DA9121_IDX_BUCK1,
 464                 .name = "DA9220/DA9132 BUCK1",
 465                 .of_match = "buck1",
 466                 .of_parse_cb = da9121_of_parse_cb,
 467                 .owner = THIS_MODULE,
 468                 .regulators_node = of_match_ptr("regulators"),
 469                 .of_map_mode = da9121_map_mode,
 470                 .ops = &da9121_buck_ops,
 471                 .type = REGULATOR_VOLTAGE,
 472                 .n_voltages = DA9121_N_VOLTAGES,
 473                 .min_uV = DA9121_MIN_MV * 1000,
 474                 .uV_step = DA9121_STEP_MV * 1000,
 475                 .linear_min_sel = DA9121_MIN_SEL,
 476                 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 477                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 478                 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 479                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 480         },
 481         {
 482                 .id = DA9121_IDX_BUCK2,
 483                 .name = "DA9220/DA9132 BUCK2",
 484                 .of_match = "buck2",
 485                 .of_parse_cb = da9121_of_parse_cb,
 486                 .owner = THIS_MODULE,
 487                 .regulators_node = of_match_ptr("regulators"),
 488                 .of_map_mode = da9121_map_mode,
 489                 .ops = &da9121_buck_ops,
 490                 .type = REGULATOR_VOLTAGE,
 491                 .n_voltages = DA9121_N_VOLTAGES,
 492                 .min_uV = DA9121_MIN_MV * 1000,
 493                 .uV_step = DA9121_STEP_MV * 1000,
 494                 .linear_min_sel = DA9121_MIN_SEL,
 495                 .enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
 496                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 497                 .vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
 498                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 499         }
 500 };
 501
 502 static const struct regulator_desc da9122_reg[2] = {
 503         {
 504                 .id = DA9121_IDX_BUCK1,
 505                 .name = "DA9122/DA9131 BUCK1",
 506                 .of_match = "buck1",
 507                 .of_parse_cb = da9121_of_parse_cb,
 508                 .owner = THIS_MODULE,
 509                 .regulators_node = of_match_ptr("regulators"),
 510                 .of_map_mode = da9121_map_mode,
 511                 .ops = &da9121_buck_ops,
 512                 .type = REGULATOR_VOLTAGE,
 513                 .n_voltages = DA9121_N_VOLTAGES,
 514                 .min_uV = DA9121_MIN_MV * 1000,
 515                 .uV_step = DA9121_STEP_MV * 1000,
 516                 .linear_min_sel = DA9121_MIN_SEL,
 517                 .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 518                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 519                 .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 520                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 521         },
 522         {
 523                 .id = DA9121_IDX_BUCK2,
 524                 .name = "DA9122/DA9131 BUCK2",
 525                 .of_match = "buck2",
 526                 .of_parse_cb = da9121_of_parse_cb,
 527                 .owner = THIS_MODULE,
 528                 .regulators_node = of_match_ptr("regulators"),
 529                 .of_map_mode = da9121_map_mode,
 530                 .ops = &da9121_buck_ops,
 531                 .type = REGULATOR_VOLTAGE,
 532                 .n_voltages = DA9121_N_VOLTAGES,
 533                 .min_uV = DA9121_MIN_MV * 1000,
 534                 .uV_step = DA9121_STEP_MV * 1000,
 535                 .linear_min_sel = DA9121_MIN_SEL,
 536                 .enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
 537                 .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 538                 .vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
 539                 .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 540         }
 541 };
 542
 543 static const struct regulator_desc da9217_reg = {
 544         .id = DA9121_IDX_BUCK1,
 545         .name = "DA9217 BUCK1",
 546         .of_match = "buck1",
 547         .of_parse_cb = da9121_of_parse_cb,
 548         .owner = THIS_MODULE,
 549         .regulators_node = of_match_ptr("regulators"),
 550         .of_map_mode = da9121_map_mode,
 551         .ops = &da9121_buck_ops,
 552         .type = REGULATOR_VOLTAGE,
 553         .n_voltages = DA9121_N_VOLTAGES,
 554         .min_uV = DA9121_MIN_MV * 1000,
 555         .uV_step = DA9121_STEP_MV * 1000,
 556         .linear_min_sel = DA9121_MIN_SEL,
 557         .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 558         .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 559         .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 560         .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 561 };
 562
 563 #define DA914X_MIN_MV           500
 564 #define DA914X_MAX_MV           1000
 565 #define DA914X_STEP_MV          10
 566 #define DA914X_MIN_SEL          (DA914X_MIN_MV / DA914X_STEP_MV)
 567 #define DA914X_N_VOLTAGES       (((DA914X_MAX_MV - DA914X_MIN_MV) / DA914X_STEP_MV) \
 568                                  + 1 + DA914X_MIN_SEL)
 569
 570 static const struct regulator_desc da9141_reg = {
 571         .id = DA9121_IDX_BUCK1,
 572         .name = "DA9141",
 573         .of_match = "buck1",
 574         .of_parse_cb = da9121_of_parse_cb,
 575         .owner = THIS_MODULE,
 576         .regulators_node = of_match_ptr("regulators"),
 577         .of_map_mode = da9121_map_mode,
 578         .ops = &da9121_buck_ops,
 579         .type = REGULATOR_VOLTAGE,
 580         .n_voltages = DA914X_N_VOLTAGES,
 581         .min_uV = DA914X_MIN_MV * 1000,
 582         .uV_step = DA914X_STEP_MV * 1000,
 583         .linear_min_sel = DA914X_MIN_SEL,
 584         .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 585         .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 586         .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 587         .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 588         /* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
 589         .ramp_delay = 20000,
 590         /* tBUCK_EN */
 591         .enable_time = 20,
 592 };
 593
 594 static const struct regulator_desc da9142_reg = {
 595         .id = DA9121_IDX_BUCK1,
 596         .name = "DA9142 BUCK1",
 597         .of_match = "buck1",
 598         .of_parse_cb = da9121_of_parse_cb,
 599         .owner = THIS_MODULE,
 600         .regulators_node = of_match_ptr("regulators"),
 601         .of_map_mode = da9121_map_mode,
 602         .ops = &da9121_buck_ops,
 603         .type = REGULATOR_VOLTAGE,
 604         .n_voltages = DA914X_N_VOLTAGES,
 605         .min_uV = DA914X_MIN_MV * 1000,
 606         .uV_step = DA914X_STEP_MV * 1000,
 607         .linear_min_sel = DA914X_MIN_SEL,
 608         .enable_reg = DA9121_REG_BUCK_BUCK1_0,
 609         .enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
 610         .vsel_reg = DA9121_REG_BUCK_BUCK1_5,
 611         .vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
 612 };
 613
 614
 615 static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
 616         [DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
 617         [DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
 618         [DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
 619         [DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
 620         [DA9121_TYPE_DA9141] = { &da9141_reg, NULL },
 621         [DA9121_TYPE_DA9142] = { &da9142_reg, NULL },
 622 };
 623
 624 static void da9121_status_poll_on(struct work_struct *work)
 625 {
 626         struct da9121 *chip = container_of(work, struct da9121, work.work);
 627         int status[3] = {0};
 628         int clear[3] = {0};
 629         unsigned long delay;
 630         int i;
 631         int ret;
 632
 633         ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
 634         if (ret < 0) {
 635                 dev_err(chip->dev,
 636                         "Failed to read STATUS registers: %d\n", ret);
 637                 goto error;
 638         }
 639
 640         /* Possible events are tested to be within range for the variant, potentially
 641          * masked by the IRQ handler (not just warned about), as having been masked,
 642          * and the respective state cleared - then flagged to unmask for next IRQ.
 643          */
 644         for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
 645                 const struct status_event_data *item = &status_event_handling[i];
 646                 int reg_idx = item->reg_index;
 647                 bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
 648                 bool supported = (item->warn == NULL);
 649                 bool persisting = (chip->persistent[reg_idx] & item->event_bit);
 650                 bool now_cleared = !(status[reg_idx] & item->status_bit);
 651
 652                 if (relevant && supported && persisting && now_cleared) {
 653                         clear[reg_idx] |= item->mask_bit;
 654                         chip->persistent[reg_idx] &= ~item->event_bit;
 655                 }
 656         }
 657
 658         for (i = 0; i < 2; i++) {
 659                 if (clear[i]) {
 660                         unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
 661                         unsigned int mbit = clear[i];
 662
 663                         ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
 664                         if (ret < 0) {
 665                                 dev_err(chip->dev,
 666                                         "Failed to unmask 0x%02x %d\n",
 667                                         reg, ret);
 668                                 goto error;
 669                         }
 670                 }
 671         }
 672
 673         if (chip->persistent[0] | chip->persistent[1]) {
 674                 delay = msecs_to_jiffies(chip->passive_delay);
 675                 queue_delayed_work(system_freezable_wq, &chip->work, delay);
 676         }
 677
 678 error:
 679         return;
 680 }
 681
 682 static irqreturn_t da9121_irq_handler(int irq, void *data)
 683 {
 684         struct da9121 *chip = data;
 685         struct regulator_dev *rdev;
 686         int event[3] = {0};
 687         int handled[3] = {0};
 688         int mask[3] = {0};
 689         int ret = IRQ_NONE;
 690         int i;
 691         int err;
 692
 693         err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
 694         if (err < 0) {
 695                 dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
 696                 ret = IRQ_NONE;
 697                 goto error;
 698         }
 699
 700         err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
 701         if (err < 0) {
 702                 dev_err(chip->dev,
 703                         "Failed to read MASK registers: %d\n", ret);
 704                 ret = IRQ_NONE;
 705                 goto error;
 706         }
 707
 708         rdev = chip->rdev[DA9121_IDX_BUCK1];
 709
 710         /* Possible events are tested to be within range for the variant, currently
 711          * enabled, and having triggered this IRQ. The event may then be notified,
 712          * or a warning given for unexpected events - those from device POR, and
 713          * currently unsupported GPIO configurations.
 714          */
 715         for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
 716                 const struct status_event_data *item = &status_event_handling[i];
 717                 int reg_idx = item->reg_index;
 718                 bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
 719                 bool enabled = !(mask[reg_idx] & item->mask_bit);
 720                 bool active = (event[reg_idx] & item->event_bit);
 721                 bool notify = (item->warn == NULL);
 722
 723                 if (relevant && enabled && active) {
 724                         if (notify) {
 725                                 chip->persistent[reg_idx] |= item->event_bit;
 726                                 regulator_notifier_call_chain(rdev, item->notification, NULL);
 727                         } else {
 728                                 dev_warn(chip->dev, item->warn);
 729                                 handled[reg_idx] |= item->event_bit;
 730                                 ret = IRQ_HANDLED;
 731                         }
 732                 }
 733         }
 734
 735         for (i = 0; i < 3; i++) {
 736                 if (event[i] != handled[i]) {
 737                         dev_warn(chip->dev,
 738                                 "Unhandled event(s) in bank%d 0x%02x\n", i,
 739                                 event[i] ^ handled[i]);
 740                 }
 741         }
 742
 743         /* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
 744         for (i = 0; i < 2; i++) {
 745                 if (handled[i]) {
 746                         unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
 747                         unsigned int mbit = handled[i];
 748
 749                         err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
 750                         if (err < 0) {
 751                                 dev_err(chip->dev,
 752                                         "Failed to mask 0x%02x interrupt %d\n",
 753                                         reg, err);
 754                                 ret = IRQ_NONE;
 755                                 goto error;
 756                         }
 757                 }
 758         }
 759
 760         /* clear the events */
 761         if (handled[0] | handled[1] | handled[2]) {
 762                 err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
 763                 if (err < 0) {
 764                         dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
 765                         ret = IRQ_NONE;
 766                         goto error;
 767                 }
 768         }
 769
 770         queue_delayed_work(system_freezable_wq, &chip->work, 0);
 771 error:
 772         return ret;
 773 }
 774
 775 static int da9121_set_regulator_config(struct da9121 *chip)
 776 {
 777         struct regulator_config config = { };
 778         unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
 779         int ret = 0;
 780         int i;
 781
 782         for (i = 0; i < max_matches; i++) {
 783                 const struct regulator_desc *regl_desc =
 784                         local_da9121_regulators[chip->variant_id][i];
 785
 786                 config.dev = chip->dev;
 787                 config.driver_data = chip;
 788                 config.regmap = chip->regmap;
 789
 790                 chip->rdev[i] = devm_regulator_register(chip->dev,
 791                                         regl_desc, &config);
 792                 if (IS_ERR(chip->rdev[i])) {
 793                         dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
 794                                 regl_desc->name, (i+1), max_matches);
 795                         ret = PTR_ERR(chip->rdev[i]);
 796                         goto error;
 797                 }
 798         }
 799
 800 error:
 801         return ret;
 802 }
 803
 804 /* DA9121 chip register model */
 805 static const struct regmap_range da9121_1ch_readable_ranges[] = {
 806         regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
 807         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 808         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 809         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
 810         regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
 811 };
 812
 813 static const struct regmap_access_table da9121_1ch_readable_table = {
 814         .yes_ranges = da9121_1ch_readable_ranges,
 815         .n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
 816 };
 817
 818 static const struct regmap_range da9121_2ch_readable_ranges[] = {
 819         regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
 820         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 821         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 822         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
 823         regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
 824         regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
 825 };
 826
 827 static const struct regmap_access_table da9121_2ch_readable_table = {
 828         .yes_ranges = da9121_2ch_readable_ranges,
 829         .n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
 830 };
 831
 832 static const struct regmap_range da9121_1ch_writeable_ranges[] = {
 833         regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
 834         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 835         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 836         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
 837         regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
 838 };
 839
 840 static const struct regmap_access_table da9121_1ch_writeable_table = {
 841         .yes_ranges = da9121_1ch_writeable_ranges,
 842         .n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
 843 };
 844
 845 static const struct regmap_range da9121_2ch_writeable_ranges[] = {
 846         regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
 847         regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
 848         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 849         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
 850         regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
 851         regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
 852         regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
 853 };
 854
 855 static const struct regmap_access_table da9121_2ch_writeable_table = {
 856         .yes_ranges = da9121_2ch_writeable_ranges,
 857         .n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
 858 };
 859
 860
 861 static const struct regmap_range da9121_volatile_ranges[] = {
 862         regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
 863         regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
 864         regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
 865 };
 866
 867 static const struct regmap_access_table da9121_volatile_table = {
 868         .yes_ranges = da9121_volatile_ranges,
 869         .n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
 870 };
 871
 872 /* DA9121 regmap config for 1 channel variants */
 873 static struct regmap_config da9121_1ch_regmap_config = {
 874         .reg_bits = 8,
 875         .val_bits = 8,
 876         .max_register = DA9121_REG_OTP_CONFIG_ID,
 877         .rd_table = &da9121_1ch_readable_table,
 878         .wr_table = &da9121_1ch_writeable_table,
 879         .volatile_table = &da9121_volatile_table,
 880         .cache_type = REGCACHE_RBTREE,
 881 };
 882
 883 /* DA9121 regmap config for 2 channel variants */
 884 static struct regmap_config da9121_2ch_regmap_config = {
 885         .reg_bits = 8,
 886         .val_bits = 8,
 887         .max_register = DA9121_REG_OTP_CONFIG_ID,
 888         .rd_table = &da9121_2ch_readable_table,
 889         .wr_table = &da9121_2ch_writeable_table,
 890         .volatile_table = &da9121_volatile_table,
 891         .cache_type = REGCACHE_RBTREE,
 892 };
 893
 894 static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
 895 {
 896         u32 device_id;
 897         u32 variant_id;
 898         u8 variant_mrc, variant_vrc;
 899         char *type;
 900         bool config_match = false;
 901         int ret = 0;
 902
 903         ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
 904         if (ret < 0) {
 905                 dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
 906                 goto error;
 907         }
 908
 909         ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
 910         if (ret < 0) {
 911                 dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
 912                 goto error;
 913         }
 914
 915         if ((device_id != DA9121_DEVICE_ID) && (device_id != DA914x_DEVICE_ID)) {
 916                 dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
 917                 ret = -ENODEV;
 918                 goto error;
 919         }
 920
 921         variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
 922
 923         switch (chip->subvariant_id) {
 924         case DA9121_SUBTYPE_DA9121:
 925                 type = "DA9121";
 926                 config_match = (variant_vrc == DA9121_VARIANT_VRC);
 927                 break;
 928         case DA9121_SUBTYPE_DA9130:
 929                 type = "DA9130";
 930                 config_match = (variant_vrc == DA9130_VARIANT_VRC);
 931                 break;
 932         case DA9121_SUBTYPE_DA9220:
 933                 type = "DA9220";
 934                 config_match = (variant_vrc == DA9220_VARIANT_VRC);
 935                 break;
 936         case DA9121_SUBTYPE_DA9132:
 937                 type = "DA9132";
 938                 config_match = (variant_vrc == DA9132_VARIANT_VRC);
 939                 break;
 940         case DA9121_SUBTYPE_DA9122:
 941                 type = "DA9122";
 942                 config_match = (variant_vrc == DA9122_VARIANT_VRC);
 943                 break;
 944         case DA9121_SUBTYPE_DA9131:
 945                 type = "DA9131";
 946                 config_match = (variant_vrc == DA9131_VARIANT_VRC);
 947                 break;
 948         case DA9121_SUBTYPE_DA9217:
 949                 type = "DA9217";
 950                 config_match = (variant_vrc == DA9217_VARIANT_VRC);
 951                 break;
 952         default:
 953                 type = "Unknown";
 954                 break;
 955         }
 956
 957         if (device_id == DA914x_DEVICE_ID) {
 958                 switch (chip->subvariant_id) {
 959                 case DA9121_SUBTYPE_DA9141:
 960                         type = "DA9141";
 961                         config_match = (variant_vrc == DA9141_VARIANT_VRC);
 962                         break;
 963                 case DA9121_SUBTYPE_DA9142:
 964                         type = "DA9142";
 965                         config_match = (variant_vrc == DA9142_VARIANT_VRC);
 966                         break;
 967                 default:
 968                         type = "Unknown";
 969                         break;
 970                 }
 971         }
 972
 973         dev_info(chip->dev,
 974                  "Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
 975                  device_id, variant_id, type);
 976
 977         if (!config_match) {
 978                 dev_err(chip->dev, "Device tree configuration does not match detected device.\n");
 979                 ret = -EINVAL;
 980                 goto error;
 981         }
 982
 983         variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
 984                         >> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
 985
 986         if (((device_id == DA9121_DEVICE_ID) &&
 987              (variant_mrc < DA9121_VARIANT_MRC_BASE)) ||
 988             ((device_id == DA914x_DEVICE_ID) &&
 989              (variant_mrc != DA914x_VARIANT_MRC_BASE))) {
 990                 dev_err(chip->dev,
 991                         "Cannot support variant MRC: 0x%02X\n", variant_mrc);
 992                 ret = -EINVAL;
 993         }
 994 error:
 995         return ret;
 996 }
 997
 998 static int da9121_assign_chip_model(struct i2c_client *i2c,
 999                         struct da9121 *chip)
1000 {
1001         struct regmap_config *regmap;
1002         int ret = 0;
1003
1004         chip->dev = &i2c->dev;
1005
1006         /* Use configured subtype to select the regulator descriptor index and
1007          * register map, common to both consumer and automotive grade variants
1008          */
1009         switch (chip->subvariant_id) {
1010         case DA9121_SUBTYPE_DA9121:
1011         case DA9121_SUBTYPE_DA9130:
1012                 chip->variant_id = DA9121_TYPE_DA9121_DA9130;
1013                 regmap = &da9121_1ch_regmap_config;
1014                 break;
1015         case DA9121_SUBTYPE_DA9217:
1016                 chip->variant_id = DA9121_TYPE_DA9217;
1017                 regmap = &da9121_1ch_regmap_config;
1018                 break;
1019         case DA9121_SUBTYPE_DA9122:
1020         case DA9121_SUBTYPE_DA9131:
1021                 chip->variant_id = DA9121_TYPE_DA9122_DA9131;
1022                 regmap = &da9121_2ch_regmap_config;
1023                 break;
1024         case DA9121_SUBTYPE_DA9220:
1025         case DA9121_SUBTYPE_DA9132:
1026                 chip->variant_id = DA9121_TYPE_DA9220_DA9132;
1027                 regmap = &da9121_2ch_regmap_config;
1028                 break;
1029         case DA9121_SUBTYPE_DA9141:
1030                 chip->variant_id = DA9121_TYPE_DA9141;
1031                 regmap = &da9121_1ch_regmap_config;
1032                 break;
1033         case DA9121_SUBTYPE_DA9142:
1034                 chip->variant_id = DA9121_TYPE_DA9142;
1035                 regmap = &da9121_2ch_regmap_config;
1036                 break;
1037         }
1038
1039         /* Set these up for of_regulator_match call which may want .of_map_modes */
1040         da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
1041         da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];
1042
1043         chip->regmap = devm_regmap_init_i2c(i2c, regmap);
1044         if (IS_ERR(chip->regmap)) {
1045                 ret = PTR_ERR(chip->regmap);
1046                 dev_err(chip->dev, "Failed to configure a register map: %d\n",
1047                         ret);
1048                 return ret;
1049         }
1050
1051         ret = da9121_check_device_type(i2c, chip);
1052
1053         return ret;
1054 }
1055
1056 static int da9121_config_irq(struct i2c_client *i2c,
1057                         struct da9121 *chip)
1058 {
1059         unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
1060         const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
1061         int ret = 0;
1062
1063         chip->chip_irq = i2c->irq;
1064
1065         if (chip->chip_irq != 0) {
1066                 if (!of_property_read_u32(chip->dev->of_node,
1067                                           "dlg,irq-polling-delay-passive-ms",
1068                                           &p_delay)) {
1069                         if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
1070                             p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
1071                                 dev_warn(chip->dev,
1072                                          "Out-of-range polling period %d ms\n",
1073                                          p_delay);
1074                                 p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
1075                         }
1076                 }
1077
1078                 chip->passive_delay = p_delay;
1079
1080                 ret = request_threaded_irq(chip->chip_irq, NULL,
1081                                         da9121_irq_handler,
1082                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
1083                                         "da9121", chip);
1084                 if (ret != 0) {
1085                         dev_err(chip->dev, "Failed IRQ request: %d\n",
1086                                 chip->chip_irq);
1087                         goto error;
1088                 }
1089
1090                 ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1091                 if (ret != 0) {
1092                         dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
1093                                 ret);
1094                         goto regmap_error;
1095                 }
1096
1097                 INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
1098                 dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
1099                          chip->passive_delay);
1100         }
1101 error:
1102         return ret;
1103 regmap_error:
1104         free_irq(chip->chip_irq, chip);
1105         return ret;
1106 }
1107
1108 static const struct of_device_id da9121_dt_ids[] = {
1109         { .compatible = "dlg,da9121", .data = (void *) DA9121_SUBTYPE_DA9121 },
1110         { .compatible = "dlg,da9130", .data = (void *) DA9121_SUBTYPE_DA9130 },
1111         { .compatible = "dlg,da9217", .data = (void *) DA9121_SUBTYPE_DA9217 },
1112         { .compatible = "dlg,da9122", .data = (void *) DA9121_SUBTYPE_DA9122 },
1113         { .compatible = "dlg,da9131", .data = (void *) DA9121_SUBTYPE_DA9131 },
1114         { .compatible = "dlg,da9220", .data = (void *) DA9121_SUBTYPE_DA9220 },
1115         { .compatible = "dlg,da9132", .data = (void *) DA9121_SUBTYPE_DA9132 },
1116         { .compatible = "dlg,da9141", .data = (void *) DA9121_SUBTYPE_DA9141 },
1117         { .compatible = "dlg,da9142", .data = (void *) DA9121_SUBTYPE_DA9142 },
1118         { }
1119 };
1120 MODULE_DEVICE_TABLE(of, da9121_dt_ids);
1121
1122 static inline int da9121_of_get_id(struct device *dev)
1123 {
1124         const struct of_device_id *id = of_match_device(da9121_dt_ids, dev);
1125
1126         if (!id) {
1127                 dev_err(dev, "%s: Failed\n", __func__);
1128                 return -EINVAL;
1129         }
1130         return (uintptr_t)id->data;
1131 }
1132
1133 static int da9121_i2c_probe(struct i2c_client *i2c,
1134                             const struct i2c_device_id *id)
1135 {
1136         struct da9121 *chip;
1137         const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1138         int ret = 0;
1139
1140         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
1141         if (!chip) {
1142                 ret = -ENOMEM;
1143                 goto error;
1144         }
1145
1146         chip->pdata = i2c->dev.platform_data;
1147         chip->subvariant_id = da9121_of_get_id(&i2c->dev);
1148
1149         ret = da9121_assign_chip_model(i2c, chip);
1150         if (ret < 0)
1151                 goto error;
1152
1153         ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1154         if (ret != 0) {
1155                 dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1156                 goto error;
1157         }
1158
1159         ret = da9121_set_regulator_config(chip);
1160         if (ret < 0)
1161                 goto error;
1162
1163         ret = da9121_config_irq(i2c, chip);
1164
1165 error:
1166         return ret;
1167 }
1168
1169 static int da9121_i2c_remove(struct i2c_client *i2c)
1170 {
1171         struct da9121 *chip = i2c_get_clientdata(i2c);
1172         const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
1173         int ret;
1174
1175         free_irq(chip->chip_irq, chip);
1176         cancel_delayed_work_sync(&chip->work);
1177
1178         ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
1179         if (ret != 0)
1180                 dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
1181         return 0;
1182 }
1183
1184 static const struct i2c_device_id da9121_i2c_id[] = {
1185         {"da9121", DA9121_TYPE_DA9121_DA9130},
1186         {"da9130", DA9121_TYPE_DA9121_DA9130},
1187         {"da9217", DA9121_TYPE_DA9217},
1188         {"da9122", DA9121_TYPE_DA9122_DA9131},
1189         {"da9131", DA9121_TYPE_DA9122_DA9131},
1190         {"da9220", DA9121_TYPE_DA9220_DA9132},
1191         {"da9132", DA9121_TYPE_DA9220_DA9132},
1192         {"da9141", DA9121_TYPE_DA9141},
1193         {"da9142", DA9121_TYPE_DA9142},
1194         {},
1195 };
1196 MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
1197
1198 static struct i2c_driver da9121_regulator_driver = {
1199         .driver = {
1200                 .name = "da9121",
1201                 .of_match_table = of_match_ptr(da9121_dt_ids),
1202         },
1203         .probe = da9121_i2c_probe,
1204         .remove = da9121_i2c_remove,
1205         .id_table = da9121_i2c_id,
1206 };
1207
1208 module_i2c_driver(da9121_regulator_driver);
1209
1210 MODULE_LICENSE("GPL v2");