drivers/mfd/qcom-pm8xxx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
   4  */
   5
   6 #define pr_fmt(fmt) "%s: " fmt, __func__
   7
   8 #include <linux/kernel.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/irqchip/chained_irq.h>
  11 #include <linux/irq.h>
  12 #include <linux/irqdomain.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/err.h>
  17 #include <linux/ssbi.h>
  18 #include <linux/regmap.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/mfd/core.h>
  21
  22 #define SSBI_REG_ADDR_IRQ_BASE          0x1BB
  23
  24 #define SSBI_REG_ADDR_IRQ_ROOT          (SSBI_REG_ADDR_IRQ_BASE + 0)
  25 #define SSBI_REG_ADDR_IRQ_M_STATUS1     (SSBI_REG_ADDR_IRQ_BASE + 1)
  26 #define SSBI_REG_ADDR_IRQ_M_STATUS2     (SSBI_REG_ADDR_IRQ_BASE + 2)
  27 #define SSBI_REG_ADDR_IRQ_M_STATUS3     (SSBI_REG_ADDR_IRQ_BASE + 3)
  28 #define SSBI_REG_ADDR_IRQ_M_STATUS4     (SSBI_REG_ADDR_IRQ_BASE + 4)
  29 #define SSBI_REG_ADDR_IRQ_BLK_SEL       (SSBI_REG_ADDR_IRQ_BASE + 5)
  30 #define SSBI_REG_ADDR_IRQ_IT_STATUS     (SSBI_REG_ADDR_IRQ_BASE + 6)
  31 #define SSBI_REG_ADDR_IRQ_CONFIG        (SSBI_REG_ADDR_IRQ_BASE + 7)
  32 #define SSBI_REG_ADDR_IRQ_RT_STATUS     (SSBI_REG_ADDR_IRQ_BASE + 8)
  33
  34 #define PM8821_SSBI_REG_ADDR_IRQ_BASE   0x100
  35 #define PM8821_SSBI_REG_ADDR_IRQ_MASTER0 (PM8821_SSBI_REG_ADDR_IRQ_BASE + 0x30)
  36 #define PM8821_SSBI_REG_ADDR_IRQ_MASTER1 (PM8821_SSBI_REG_ADDR_IRQ_BASE + 0xb0)
  37 #define PM8821_SSBI_REG(m, b, offset) \
  38                         ((m == 0) ? \
  39                         (PM8821_SSBI_REG_ADDR_IRQ_MASTER0 + b + offset) : \
  40                         (PM8821_SSBI_REG_ADDR_IRQ_MASTER1 + b + offset))
  41 #define PM8821_SSBI_ADDR_IRQ_ROOT(m, b)         PM8821_SSBI_REG(m, b, 0x0)
  42 #define PM8821_SSBI_ADDR_IRQ_CLEAR(m, b)        PM8821_SSBI_REG(m, b, 0x01)
  43 #define PM8821_SSBI_ADDR_IRQ_MASK(m, b)         PM8821_SSBI_REG(m, b, 0x08)
  44 #define PM8821_SSBI_ADDR_IRQ_RT_STATUS(m, b)    PM8821_SSBI_REG(m, b, 0x0f)
  45
  46 #define PM8821_BLOCKS_PER_MASTER        7
  47
  48 #define PM_IRQF_LVL_SEL                 0x01    /* level select */
  49 #define PM_IRQF_MASK_FE                 0x02    /* mask falling edge */
  50 #define PM_IRQF_MASK_RE                 0x04    /* mask rising edge */
  51 #define PM_IRQF_CLR                     0x08    /* clear interrupt */
  52 #define PM_IRQF_BITS_MASK               0x70
  53 #define PM_IRQF_BITS_SHIFT              4
  54 #define PM_IRQF_WRITE                   0x80
  55
  56 #define PM_IRQF_MASK_ALL                (PM_IRQF_MASK_FE | \
  57                                         PM_IRQF_MASK_RE)
  58
  59 #define REG_HWREV               0x002  /* PMIC4 revision */
  60 #define REG_HWREV_2             0x0E8  /* PMIC4 revision 2 */
  61
  62 #define PM8XXX_NR_IRQS          256
  63 #define PM8821_NR_IRQS          112
  64
  65 struct pm_irq_data {
  66         int num_irqs;
  67         struct irq_chip *irq_chip;
  68         irq_handler_t irq_handler;
  69 };
  70
  71 struct pm_irq_chip {
  72         struct regmap           *regmap;
  73         spinlock_t              pm_irq_lock;
  74         struct irq_domain       *irqdomain;
  75         unsigned int            num_blocks;
  76         unsigned int            num_masters;
  77         const struct pm_irq_data *pm_irq_data;
  78         /* MUST BE AT THE END OF THIS STRUCT */
  79         u8                      config[];
  80 };
  81
  82 static int pm8xxx_read_block_irq(struct pm_irq_chip *chip, unsigned int bp,
  83                                  unsigned int *ip)
  84 {
  85         int     rc;
  86
  87         spin_lock(&chip->pm_irq_lock);
  88         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
  89         if (rc) {
  90                 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
  91                 goto bail;
  92         }
  93
  94         rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_IT_STATUS, ip);
  95         if (rc)
  96                 pr_err("Failed Reading Status rc=%d\n", rc);
  97 bail:
  98         spin_unlock(&chip->pm_irq_lock);
  99         return rc;
 100 }
 101
 102 static int
 103 pm8xxx_config_irq(struct pm_irq_chip *chip, unsigned int bp, unsigned int cp)
 104 {
 105         int     rc;
 106         unsigned long flags;
 107
 108         spin_lock_irqsave(&chip->pm_irq_lock, flags);
 109         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, bp);
 110         if (rc) {
 111                 pr_err("Failed Selecting Block %d rc=%d\n", bp, rc);
 112                 goto bail;
 113         }
 114
 115         cp |= PM_IRQF_WRITE;
 116         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_CONFIG, cp);
 117         if (rc)
 118                 pr_err("Failed Configuring IRQ rc=%d\n", rc);
 119 bail:
 120         spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
 121         return rc;
 122 }
 123
 124 static int pm8xxx_irq_block_handler(struct pm_irq_chip *chip, int block)
 125 {
 126         int pmirq, i, ret = 0;
 127         unsigned int bits;
 128
 129         ret = pm8xxx_read_block_irq(chip, block, &bits);
 130         if (ret) {
 131                 pr_err("Failed reading %d block ret=%d", block, ret);
 132                 return ret;
 133         }
 134         if (!bits) {
 135                 pr_err("block bit set in master but no irqs: %d", block);
 136                 return 0;
 137         }
 138
 139         /* Check IRQ bits */
 140         for (i = 0; i < 8; i++) {
 141                 if (bits & (1 << i)) {
 142                         pmirq = block * 8 + i;
 143                         generic_handle_domain_irq(chip->irqdomain, pmirq);
 144                 }
 145         }
 146         return 0;
 147 }
 148
 149 static int pm8xxx_irq_master_handler(struct pm_irq_chip *chip, int master)
 150 {
 151         unsigned int blockbits;
 152         int block_number, i, ret = 0;
 153
 154         ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_M_STATUS1 + master,
 155                           &blockbits);
 156         if (ret) {
 157                 pr_err("Failed to read master %d ret=%d\n", master, ret);
 158                 return ret;
 159         }
 160         if (!blockbits) {
 161                 pr_err("master bit set in root but no blocks: %d", master);
 162                 return 0;
 163         }
 164
 165         for (i = 0; i < 8; i++)
 166                 if (blockbits & (1 << i)) {
 167                         block_number = master * 8 + i;  /* block # */
 168                         ret |= pm8xxx_irq_block_handler(chip, block_number);
 169                 }
 170         return ret;
 171 }
 172
 173 static irqreturn_t pm8xxx_irq_handler(int irq, void *data)
 174 {
 175         struct pm_irq_chip *chip = data;
 176         unsigned int root;
 177         int     i, ret, masters = 0;
 178
 179         ret = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_ROOT, &root);
 180         if (ret) {
 181                 pr_err("Can't read root status ret=%d\n", ret);
 182                 return IRQ_NONE;
 183         }
 184
 185         /* on pm8xxx series masters start from bit 1 of the root */
 186         masters = root >> 1;
 187
 188         /* Read allowed masters for blocks. */
 189         for (i = 0; i < chip->num_masters; i++)
 190                 if (masters & (1 << i))
 191                         pm8xxx_irq_master_handler(chip, i);
 192
 193         return IRQ_HANDLED;
 194 }
 195
 196 static void pm8821_irq_block_handler(struct pm_irq_chip *chip,
 197                                      int master, int block)
 198 {
 199         int pmirq, i, ret;
 200         unsigned int bits;
 201
 202         ret = regmap_read(chip->regmap,
 203                           PM8821_SSBI_ADDR_IRQ_ROOT(master, block), &bits);
 204         if (ret) {
 205                 pr_err("Reading block %d failed ret=%d", block, ret);
 206                 return;
 207         }
 208
 209         /* Convert block offset to global block number */
 210         block += (master * PM8821_BLOCKS_PER_MASTER) - 1;
 211
 212         /* Check IRQ bits */
 213         for (i = 0; i < 8; i++) {
 214                 if (bits & BIT(i)) {
 215                         pmirq = block * 8 + i;
 216                         generic_handle_domain_irq(chip->irqdomain, pmirq);
 217                 }
 218         }
 219 }
 220
 221 static inline void pm8821_irq_master_handler(struct pm_irq_chip *chip,
 222                                              int master, u8 master_val)
 223 {
 224         int block;
 225
 226         for (block = 1; block < 8; block++)
 227                 if (master_val & BIT(block))
 228                         pm8821_irq_block_handler(chip, master, block);
 229 }
 230
 231 static irqreturn_t pm8821_irq_handler(int irq, void *data)
 232 {
 233         struct pm_irq_chip *chip = data;
 234         unsigned int master;
 235         int ret;
 236
 237         ret = regmap_read(chip->regmap,
 238                           PM8821_SSBI_REG_ADDR_IRQ_MASTER0, &master);
 239         if (ret) {
 240                 pr_err("Failed to read master 0 ret=%d\n", ret);
 241                 return IRQ_NONE;
 242         }
 243
 244         /* bits 1 through 7 marks the first 7 blocks in master 0 */
 245         if (master & GENMASK(7, 1))
 246                 pm8821_irq_master_handler(chip, 0, master);
 247
 248         /* bit 0 marks if master 1 contains any bits */
 249         if (!(master & BIT(0)))
 250                 return IRQ_NONE;
 251
 252         ret = regmap_read(chip->regmap,
 253                           PM8821_SSBI_REG_ADDR_IRQ_MASTER1, &master);
 254         if (ret) {
 255                 pr_err("Failed to read master 1 ret=%d\n", ret);
 256                 return IRQ_NONE;
 257         }
 258
 259         pm8821_irq_master_handler(chip, 1, master);
 260
 261         return IRQ_HANDLED;
 262 }
 263
 264 static void pm8xxx_irq_mask_ack(struct irq_data *d)
 265 {
 266         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 267         unsigned int pmirq = irqd_to_hwirq(d);
 268         u8      block, config;
 269
 270         block = pmirq / 8;
 271
 272         config = chip->config[pmirq] | PM_IRQF_MASK_ALL | PM_IRQF_CLR;
 273         pm8xxx_config_irq(chip, block, config);
 274 }
 275
 276 static void pm8xxx_irq_unmask(struct irq_data *d)
 277 {
 278         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 279         unsigned int pmirq = irqd_to_hwirq(d);
 280         u8      block, config;
 281
 282         block = pmirq / 8;
 283
 284         config = chip->config[pmirq];
 285         pm8xxx_config_irq(chip, block, config);
 286 }
 287
 288 static int pm8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
 289 {
 290         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 291         unsigned int pmirq = irqd_to_hwirq(d);
 292         int irq_bit;
 293         u8 block, config;
 294
 295         block = pmirq / 8;
 296         irq_bit  = pmirq % 8;
 297
 298         chip->config[pmirq] = (irq_bit << PM_IRQF_BITS_SHIFT)
 299                                                         | PM_IRQF_MASK_ALL;
 300         if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) {
 301                 if (flow_type & IRQF_TRIGGER_RISING)
 302                         chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
 303                 if (flow_type & IRQF_TRIGGER_FALLING)
 304                         chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
 305         } else {
 306                 chip->config[pmirq] |= PM_IRQF_LVL_SEL;
 307
 308                 if (flow_type & IRQF_TRIGGER_HIGH)
 309                         chip->config[pmirq] &= ~PM_IRQF_MASK_RE;
 310                 else
 311                         chip->config[pmirq] &= ~PM_IRQF_MASK_FE;
 312         }
 313
 314         config = chip->config[pmirq] | PM_IRQF_CLR;
 315         return pm8xxx_config_irq(chip, block, config);
 316 }
 317
 318 static int pm8xxx_irq_get_irqchip_state(struct irq_data *d,
 319                                         enum irqchip_irq_state which,
 320                                         bool *state)
 321 {
 322         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 323         unsigned int pmirq = irqd_to_hwirq(d);
 324         unsigned int bits;
 325         unsigned long flags;
 326         int irq_bit;
 327         u8 block;
 328         int rc;
 329
 330         if (which != IRQCHIP_STATE_LINE_LEVEL)
 331                 return -EINVAL;
 332
 333         block = pmirq / 8;
 334         irq_bit = pmirq % 8;
 335
 336         spin_lock_irqsave(&chip->pm_irq_lock, flags);
 337         rc = regmap_write(chip->regmap, SSBI_REG_ADDR_IRQ_BLK_SEL, block);
 338         if (rc) {
 339                 pr_err("Failed Selecting Block %d rc=%d\n", block, rc);
 340                 goto bail;
 341         }
 342
 343         rc = regmap_read(chip->regmap, SSBI_REG_ADDR_IRQ_RT_STATUS, &bits);
 344         if (rc) {
 345                 pr_err("Failed Reading Status rc=%d\n", rc);
 346                 goto bail;
 347         }
 348
 349         *state = !!(bits & BIT(irq_bit));
 350 bail:
 351         spin_unlock_irqrestore(&chip->pm_irq_lock, flags);
 352
 353         return rc;
 354 }
 355
 356 static struct irq_chip pm8xxx_irq_chip = {
 357         .name           = "pm8xxx",
 358         .irq_mask_ack   = pm8xxx_irq_mask_ack,
 359         .irq_unmask     = pm8xxx_irq_unmask,
 360         .irq_set_type   = pm8xxx_irq_set_type,
 361         .irq_get_irqchip_state = pm8xxx_irq_get_irqchip_state,
 362         .flags          = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
 363 };
 364
 365 static void pm8xxx_irq_domain_map(struct pm_irq_chip *chip,
 366                                   struct irq_domain *domain, unsigned int irq,
 367                                   irq_hw_number_t hwirq, unsigned int type)
 368 {
 369         irq_domain_set_info(domain, irq, hwirq, chip->pm_irq_data->irq_chip,
 370                             chip, handle_level_irq, NULL, NULL);
 371         irq_set_noprobe(irq);
 372 }
 373
 374 static int pm8xxx_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 375                                    unsigned int nr_irqs, void *data)
 376 {
 377         struct pm_irq_chip *chip = domain->host_data;
 378         struct irq_fwspec *fwspec = data;
 379         irq_hw_number_t hwirq;
 380         unsigned int type;
 381         int ret, i;
 382
 383         ret = irq_domain_translate_twocell(domain, fwspec, &hwirq, &type);
 384         if (ret)
 385                 return ret;
 386
 387         for (i = 0; i < nr_irqs; i++)
 388                 pm8xxx_irq_domain_map(chip, domain, virq + i, hwirq + i, type);
 389
 390         return 0;
 391 }
 392
 393 static const struct irq_domain_ops pm8xxx_irq_domain_ops = {
 394         .alloc = pm8xxx_irq_domain_alloc,
 395         .free = irq_domain_free_irqs_common,
 396         .translate = irq_domain_translate_twocell,
 397 };
 398
 399 static void pm8821_irq_mask_ack(struct irq_data *d)
 400 {
 401         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 402         unsigned int pmirq = irqd_to_hwirq(d);
 403         u8 block, master;
 404         int irq_bit, rc;
 405
 406         block = pmirq / 8;
 407         master = block / PM8821_BLOCKS_PER_MASTER;
 408         irq_bit = pmirq % 8;
 409         block %= PM8821_BLOCKS_PER_MASTER;
 410
 411         rc = regmap_update_bits(chip->regmap,
 412                                 PM8821_SSBI_ADDR_IRQ_MASK(master, block),
 413                                 BIT(irq_bit), BIT(irq_bit));
 414         if (rc) {
 415                 pr_err("Failed to mask IRQ:%d rc=%d\n", pmirq, rc);
 416                 return;
 417         }
 418
 419         rc = regmap_update_bits(chip->regmap,
 420                                 PM8821_SSBI_ADDR_IRQ_CLEAR(master, block),
 421                                 BIT(irq_bit), BIT(irq_bit));
 422         if (rc)
 423                 pr_err("Failed to CLEAR IRQ:%d rc=%d\n", pmirq, rc);
 424 }
 425
 426 static void pm8821_irq_unmask(struct irq_data *d)
 427 {
 428         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 429         unsigned int pmirq = irqd_to_hwirq(d);
 430         int irq_bit, rc;
 431         u8 block, master;
 432
 433         block = pmirq / 8;
 434         master = block / PM8821_BLOCKS_PER_MASTER;
 435         irq_bit = pmirq % 8;
 436         block %= PM8821_BLOCKS_PER_MASTER;
 437
 438         rc = regmap_update_bits(chip->regmap,
 439                                 PM8821_SSBI_ADDR_IRQ_MASK(master, block),
 440                                 BIT(irq_bit), ~BIT(irq_bit));
 441         if (rc)
 442                 pr_err("Failed to read/write unmask IRQ:%d rc=%d\n", pmirq, rc);
 443
 444 }
 445
 446 static int pm8821_irq_get_irqchip_state(struct irq_data *d,
 447                                         enum irqchip_irq_state which,
 448                                         bool *state)
 449 {
 450         struct pm_irq_chip *chip = irq_data_get_irq_chip_data(d);
 451         int rc, pmirq = irqd_to_hwirq(d);
 452         u8 block, irq_bit, master;
 453         unsigned int bits;
 454
 455         block = pmirq / 8;
 456         master = block / PM8821_BLOCKS_PER_MASTER;
 457         irq_bit = pmirq % 8;
 458         block %= PM8821_BLOCKS_PER_MASTER;
 459
 460         rc = regmap_read(chip->regmap,
 461                 PM8821_SSBI_ADDR_IRQ_RT_STATUS(master, block), &bits);
 462         if (rc) {
 463                 pr_err("Reading Status of IRQ %d failed rc=%d\n", pmirq, rc);
 464                 return rc;
 465         }
 466
 467         *state = !!(bits & BIT(irq_bit));
 468
 469         return rc;
 470 }
 471
 472 static struct irq_chip pm8821_irq_chip = {
 473         .name           = "pm8821",
 474         .irq_mask_ack   = pm8821_irq_mask_ack,
 475         .irq_unmask     = pm8821_irq_unmask,
 476         .irq_get_irqchip_state = pm8821_irq_get_irqchip_state,
 477         .flags          = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
 478 };
 479
 480 static const struct regmap_config ssbi_regmap_config = {
 481         .reg_bits = 16,
 482         .val_bits = 8,
 483         .max_register = 0x3ff,
 484         .fast_io = true,
 485         .reg_read = ssbi_reg_read,
 486         .reg_write = ssbi_reg_write
 487 };
 488
 489 static const struct pm_irq_data pm8xxx_data = {
 490         .num_irqs = PM8XXX_NR_IRQS,
 491         .irq_chip = &pm8xxx_irq_chip,
 492         .irq_handler = pm8xxx_irq_handler,
 493 };
 494
 495 static const struct pm_irq_data pm8821_data = {
 496         .num_irqs = PM8821_NR_IRQS,
 497         .irq_chip = &pm8821_irq_chip,
 498         .irq_handler = pm8821_irq_handler,
 499 };
 500
 501 static const struct of_device_id pm8xxx_id_table[] = {
 502         { .compatible = "qcom,pm8058", .data = &pm8xxx_data},
 503         { .compatible = "qcom,pm8821", .data = &pm8821_data},
 504         { .compatible = "qcom,pm8921", .data = &pm8xxx_data},
 505         { }
 506 };
 507 MODULE_DEVICE_TABLE(of, pm8xxx_id_table);
 508
 509 static int pm8xxx_probe(struct platform_device *pdev)
 510 {
 511         const struct pm_irq_data *data;
 512         struct regmap *regmap;
 513         int irq, rc;
 514         unsigned int val;
 515         struct pm_irq_chip *chip;
 516
 517         data = of_device_get_match_data(&pdev->dev);
 518         if (!data) {
 519                 dev_err(&pdev->dev, "No matching driver data found\n");
 520                 return -EINVAL;
 521         }
 522
 523         irq = platform_get_irq(pdev, 0);
 524         if (irq < 0)
 525                 return irq;
 526
 527         regmap = devm_regmap_init(&pdev->dev, NULL, pdev->dev.parent,
 528                                   &ssbi_regmap_config);
 529         if (IS_ERR(regmap))
 530                 return PTR_ERR(regmap);
 531
 532         /* Read PMIC chip revision */
 533         rc = regmap_read(regmap, REG_HWREV, &val);
 534         if (rc) {
 535                 pr_err("Failed to read hw rev reg %d:rc=%d\n", REG_HWREV, rc);
 536                 return rc;
 537         }
 538         pr_info("PMIC revision 1: %02X\n", val);
 539
 540         /* Read PMIC chip revision 2 */
 541         rc = regmap_read(regmap, REG_HWREV_2, &val);
 542         if (rc) {
 543                 pr_err("Failed to read hw rev 2 reg %d:rc=%d\n",
 544                         REG_HWREV_2, rc);
 545                 return rc;
 546         }
 547         pr_info("PMIC revision 2: %02X\n", val);
 548
 549         chip = devm_kzalloc(&pdev->dev,
 550                             struct_size(chip, config, data->num_irqs),
 551                             GFP_KERNEL);
 552         if (!chip)
 553                 return -ENOMEM;
 554
 555         platform_set_drvdata(pdev, chip);
 556         chip->regmap = regmap;
 557         chip->num_blocks = DIV_ROUND_UP(data->num_irqs, 8);
 558         chip->num_masters = DIV_ROUND_UP(chip->num_blocks, 8);
 559         chip->pm_irq_data = data;
 560         spin_lock_init(&chip->pm_irq_lock);
 561
 562         chip->irqdomain = irq_domain_add_linear(pdev->dev.of_node,
 563                                                 data->num_irqs,
 564                                                 &pm8xxx_irq_domain_ops,
 565                                                 chip);
 566         if (!chip->irqdomain)
 567                 return -ENODEV;
 568
 569         rc = devm_request_irq(&pdev->dev, irq, data->irq_handler, 0, dev_name(&pdev->dev), chip);
 570         if (rc)
 571                 return rc;
 572
 573         irq_set_irq_wake(irq, 1);
 574
 575         rc = of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 576         if (rc)
 577                 irq_domain_remove(chip->irqdomain);
 578
 579         return rc;
 580 }
 581
 582 static int pm8xxx_remove_child(struct device *dev, void *unused)
 583 {
 584         platform_device_unregister(to_platform_device(dev));
 585         return 0;
 586 }
 587
 588 static int pm8xxx_remove(struct platform_device *pdev)
 589 {
 590         struct pm_irq_chip *chip = platform_get_drvdata(pdev);
 591
 592         device_for_each_child(&pdev->dev, NULL, pm8xxx_remove_child);
 593         irq_domain_remove(chip->irqdomain);
 594
 595         return 0;
 596 }
 597
 598 static struct platform_driver pm8xxx_driver = {
 599         .probe          = pm8xxx_probe,
 600         .remove         = pm8xxx_remove,
 601         .driver         = {
 602                 .name   = "pm8xxx-core",
 603                 .of_match_table = pm8xxx_id_table,
 604         },
 605 };
 606
 607 static int __init pm8xxx_init(void)
 608 {
 609         return platform_driver_register(&pm8xxx_driver);
 610 }
 611 subsys_initcall(pm8xxx_init);
 612
 613 static void __exit pm8xxx_exit(void)
 614 {
 615         platform_driver_unregister(&pm8xxx_driver);
 616 }
 617 module_exit(pm8xxx_exit);
 618
 619 MODULE_LICENSE("GPL v2");
 620 MODULE_DESCRIPTION("PMIC 8xxx core driver");
 621 MODULE_VERSION("1.0");
 622 MODULE_ALIAS("platform:pm8xxx-core");