drivers/mfd/rk808.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * MFD core driver for Rockchip RK808/RK818
   4  *
   5  * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
   6  *
   7  * Author: Chris Zhong <zyw@rock-chips.com>
   8  * Author: Zhang Qing <zhangqing@rock-chips.com>
   9  *
  10  * Copyright (C) 2016 PHYTEC Messtechnik GmbH
  11  *
  12  * Author: Wadim Egorov <w.egorov@phytec.de>
  13  */
  14
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/mfd/rk808.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/module.h>
  20 #include <linux/of_device.h>
  21 #include <linux/regmap.h>
  22
  23 struct rk808_reg_data {
  24         int addr;
  25         int mask;
  26         int value;
  27 };
  28
  29 static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)
  30 {
  31         /*
  32          * Notes:
  33          * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
  34          *   we don't use that feature.  It's better to cache.
  35          * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
  36          *   bits are cleared in case when we shutoff anyway, but better safe.
  37          */
  38
  39         switch (reg) {
  40         case RK808_SECONDS_REG ... RK808_WEEKS_REG:
  41         case RK808_RTC_STATUS_REG:
  42         case RK808_VB_MON_REG:
  43         case RK808_THERMAL_REG:
  44         case RK808_DCDC_UV_STS_REG:
  45         case RK808_LDO_UV_STS_REG:
  46         case RK808_DCDC_PG_REG:
  47         case RK808_LDO_PG_REG:
  48         case RK808_DEVCTRL_REG:
  49         case RK808_INT_STS_REG1:
  50         case RK808_INT_STS_REG2:
  51                 return true;
  52         }
  53
  54         return false;
  55 }
  56
  57 static const struct regmap_config rk818_regmap_config = {
  58         .reg_bits = 8,
  59         .val_bits = 8,
  60         .max_register = RK818_USB_CTRL_REG,
  61         .cache_type = REGCACHE_RBTREE,
  62         .volatile_reg = rk808_is_volatile_reg,
  63 };
  64
  65 static const struct regmap_config rk805_regmap_config = {
  66         .reg_bits = 8,
  67         .val_bits = 8,
  68         .max_register = RK805_OFF_SOURCE_REG,
  69         .cache_type = REGCACHE_RBTREE,
  70         .volatile_reg = rk808_is_volatile_reg,
  71 };
  72
  73 static const struct regmap_config rk808_regmap_config = {
  74         .reg_bits = 8,
  75         .val_bits = 8,
  76         .max_register = RK808_IO_POL_REG,
  77         .cache_type = REGCACHE_RBTREE,
  78         .volatile_reg = rk808_is_volatile_reg,
  79 };
  80
  81 static struct resource rtc_resources[] = {
  82         {
  83                 .start  = RK808_IRQ_RTC_ALARM,
  84                 .end    = RK808_IRQ_RTC_ALARM,
  85                 .flags  = IORESOURCE_IRQ,
  86         }
  87 };
  88
  89 static struct resource rk805_key_resources[] = {
  90         {
  91                 .start  = RK805_IRQ_PWRON_FALL,
  92                 .end    = RK805_IRQ_PWRON_FALL,
  93                 .flags  = IORESOURCE_IRQ,
  94         },
  95         {
  96                 .start  = RK805_IRQ_PWRON_RISE,
  97                 .end    = RK805_IRQ_PWRON_RISE,
  98                 .flags  = IORESOURCE_IRQ,
  99         }
 100 };
 101
 102 static const struct mfd_cell rk805s[] = {
 103         { .name = "rk808-clkout", },
 104         { .name = "rk808-regulator", },
 105         { .name = "rk805-pinctrl", },
 106         {
 107                 .name = "rk808-rtc",
 108                 .num_resources = ARRAY_SIZE(rtc_resources),
 109                 .resources = &rtc_resources[0],
 110         },
 111         {       .name = "rk805-pwrkey",
 112                 .num_resources = ARRAY_SIZE(rk805_key_resources),
 113                 .resources = &rk805_key_resources[0],
 114         },
 115 };
 116
 117 static const struct mfd_cell rk808s[] = {
 118         { .name = "rk808-clkout", },
 119         { .name = "rk808-regulator", },
 120         {
 121                 .name = "rk808-rtc",
 122                 .num_resources = ARRAY_SIZE(rtc_resources),
 123                 .resources = rtc_resources,
 124         },
 125 };
 126
 127 static const struct mfd_cell rk818s[] = {
 128         { .name = "rk808-clkout", },
 129         { .name = "rk808-regulator", },
 130         {
 131                 .name = "rk808-rtc",
 132                 .num_resources = ARRAY_SIZE(rtc_resources),
 133                 .resources = rtc_resources,
 134         },
 135 };
 136
 137 static const struct rk808_reg_data rk805_pre_init_reg[] = {
 138         {RK805_BUCK1_CONFIG_REG, RK805_BUCK1_2_ILMAX_MASK,
 139                                  RK805_BUCK1_2_ILMAX_4000MA},
 140         {RK805_BUCK2_CONFIG_REG, RK805_BUCK1_2_ILMAX_MASK,
 141                                  RK805_BUCK1_2_ILMAX_4000MA},
 142         {RK805_BUCK3_CONFIG_REG, RK805_BUCK3_4_ILMAX_MASK,
 143                                  RK805_BUCK3_ILMAX_3000MA},
 144         {RK805_BUCK4_CONFIG_REG, RK805_BUCK3_4_ILMAX_MASK,
 145                                  RK805_BUCK4_ILMAX_3500MA},
 146         {RK805_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK, BUCK_ILMIN_400MA},
 147         {RK805_GPIO_IO_POL_REG, SLP_SD_MSK, SLEEP_FUN},
 148         {RK805_THERMAL_REG, TEMP_HOTDIE_MSK, TEMP115C},
 149 };
 150
 151 static const struct rk808_reg_data rk808_pre_init_reg[] = {
 152         { RK808_BUCK3_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_150MA },
 153         { RK808_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_200MA },
 154         { RK808_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
 155         { RK808_BUCK1_CONFIG_REG, BUCK1_RATE_MASK,  BUCK_ILMIN_200MA },
 156         { RK808_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_200MA },
 157         { RK808_DCDC_UV_ACT_REG,  BUCK_UV_ACT_MASK, BUCK_UV_ACT_DISABLE},
 158         { RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
 159                                                     VB_LO_SEL_3500MV },
 160 };
 161
 162 static const struct rk808_reg_data rk818_pre_init_reg[] = {
 163         /* improve efficiency */
 164         { RK818_BUCK2_CONFIG_REG, BUCK2_RATE_MASK,  BUCK_ILMIN_250MA },
 165         { RK818_BUCK4_CONFIG_REG, BUCK_ILMIN_MASK,  BUCK_ILMIN_250MA },
 166         { RK818_BOOST_CONFIG_REG, BOOST_ILMIN_MASK, BOOST_ILMIN_100MA },
 167         { RK818_USB_CTRL_REG,     RK818_USB_ILIM_SEL_MASK,
 168                                                     RK818_USB_ILMIN_2000MA },
 169         /* close charger when usb lower then 3.4V */
 170         { RK818_USB_CTRL_REG,     RK818_USB_CHG_SD_VSEL_MASK,
 171                                                     (0x7 << 4) },
 172         /* no action when vref */
 173         { RK818_H5V_EN_REG,       BIT(1),           RK818_REF_RDY_CTRL },
 174         /* enable HDMI 5V */
 175         { RK818_H5V_EN_REG,       BIT(0),           RK818_H5V_EN },
 176         { RK808_VB_MON_REG,       MASK_ALL,         VB_LO_ACT |
 177                                                     VB_LO_SEL_3500MV },
 178 };
 179
 180 static const struct regmap_irq rk805_irqs[] = {
 181         [RK805_IRQ_PWRON_RISE] = {
 182                 .mask = RK805_IRQ_PWRON_RISE_MSK,
 183                 .reg_offset = 0,
 184         },
 185         [RK805_IRQ_VB_LOW] = {
 186                 .mask = RK805_IRQ_VB_LOW_MSK,
 187                 .reg_offset = 0,
 188         },
 189         [RK805_IRQ_PWRON] = {
 190                 .mask = RK805_IRQ_PWRON_MSK,
 191                 .reg_offset = 0,
 192         },
 193         [RK805_IRQ_PWRON_LP] = {
 194                 .mask = RK805_IRQ_PWRON_LP_MSK,
 195                 .reg_offset = 0,
 196         },
 197         [RK805_IRQ_HOTDIE] = {
 198                 .mask = RK805_IRQ_HOTDIE_MSK,
 199                 .reg_offset = 0,
 200         },
 201         [RK805_IRQ_RTC_ALARM] = {
 202                 .mask = RK805_IRQ_RTC_ALARM_MSK,
 203                 .reg_offset = 0,
 204         },
 205         [RK805_IRQ_RTC_PERIOD] = {
 206                 .mask = RK805_IRQ_RTC_PERIOD_MSK,
 207                 .reg_offset = 0,
 208         },
 209         [RK805_IRQ_PWRON_FALL] = {
 210                 .mask = RK805_IRQ_PWRON_FALL_MSK,
 211                 .reg_offset = 0,
 212         },
 213 };
 214
 215 static const struct regmap_irq rk808_irqs[] = {
 216         /* INT_STS */
 217         [RK808_IRQ_VOUT_LO] = {
 218                 .mask = RK808_IRQ_VOUT_LO_MSK,
 219                 .reg_offset = 0,
 220         },
 221         [RK808_IRQ_VB_LO] = {
 222                 .mask = RK808_IRQ_VB_LO_MSK,
 223                 .reg_offset = 0,
 224         },
 225         [RK808_IRQ_PWRON] = {
 226                 .mask = RK808_IRQ_PWRON_MSK,
 227                 .reg_offset = 0,
 228         },
 229         [RK808_IRQ_PWRON_LP] = {
 230                 .mask = RK808_IRQ_PWRON_LP_MSK,
 231                 .reg_offset = 0,
 232         },
 233         [RK808_IRQ_HOTDIE] = {
 234                 .mask = RK808_IRQ_HOTDIE_MSK,
 235                 .reg_offset = 0,
 236         },
 237         [RK808_IRQ_RTC_ALARM] = {
 238                 .mask = RK808_IRQ_RTC_ALARM_MSK,
 239                 .reg_offset = 0,
 240         },
 241         [RK808_IRQ_RTC_PERIOD] = {
 242                 .mask = RK808_IRQ_RTC_PERIOD_MSK,
 243                 .reg_offset = 0,
 244         },
 245
 246         /* INT_STS2 */
 247         [RK808_IRQ_PLUG_IN_INT] = {
 248                 .mask = RK808_IRQ_PLUG_IN_INT_MSK,
 249                 .reg_offset = 1,
 250         },
 251         [RK808_IRQ_PLUG_OUT_INT] = {
 252                 .mask = RK808_IRQ_PLUG_OUT_INT_MSK,
 253                 .reg_offset = 1,
 254         },
 255 };
 256
 257 static const struct regmap_irq rk818_irqs[] = {
 258         /* INT_STS */
 259         [RK818_IRQ_VOUT_LO] = {
 260                 .mask = RK818_IRQ_VOUT_LO_MSK,
 261                 .reg_offset = 0,
 262         },
 263         [RK818_IRQ_VB_LO] = {
 264                 .mask = RK818_IRQ_VB_LO_MSK,
 265                 .reg_offset = 0,
 266         },
 267         [RK818_IRQ_PWRON] = {
 268                 .mask = RK818_IRQ_PWRON_MSK,
 269                 .reg_offset = 0,
 270         },
 271         [RK818_IRQ_PWRON_LP] = {
 272                 .mask = RK818_IRQ_PWRON_LP_MSK,
 273                 .reg_offset = 0,
 274         },
 275         [RK818_IRQ_HOTDIE] = {
 276                 .mask = RK818_IRQ_HOTDIE_MSK,
 277                 .reg_offset = 0,
 278         },
 279         [RK818_IRQ_RTC_ALARM] = {
 280                 .mask = RK818_IRQ_RTC_ALARM_MSK,
 281                 .reg_offset = 0,
 282         },
 283         [RK818_IRQ_RTC_PERIOD] = {
 284                 .mask = RK818_IRQ_RTC_PERIOD_MSK,
 285                 .reg_offset = 0,
 286         },
 287         [RK818_IRQ_USB_OV] = {
 288                 .mask = RK818_IRQ_USB_OV_MSK,
 289                 .reg_offset = 0,
 290         },
 291
 292         /* INT_STS2 */
 293         [RK818_IRQ_PLUG_IN] = {
 294                 .mask = RK818_IRQ_PLUG_IN_MSK,
 295                 .reg_offset = 1,
 296         },
 297         [RK818_IRQ_PLUG_OUT] = {
 298                 .mask = RK818_IRQ_PLUG_OUT_MSK,
 299                 .reg_offset = 1,
 300         },
 301         [RK818_IRQ_CHG_OK] = {
 302                 .mask = RK818_IRQ_CHG_OK_MSK,
 303                 .reg_offset = 1,
 304         },
 305         [RK818_IRQ_CHG_TE] = {
 306                 .mask = RK818_IRQ_CHG_TE_MSK,
 307                 .reg_offset = 1,
 308         },
 309         [RK818_IRQ_CHG_TS1] = {
 310                 .mask = RK818_IRQ_CHG_TS1_MSK,
 311                 .reg_offset = 1,
 312         },
 313         [RK818_IRQ_TS2] = {
 314                 .mask = RK818_IRQ_TS2_MSK,
 315                 .reg_offset = 1,
 316         },
 317         [RK818_IRQ_CHG_CVTLIM] = {
 318                 .mask = RK818_IRQ_CHG_CVTLIM_MSK,
 319                 .reg_offset = 1,
 320         },
 321         [RK818_IRQ_DISCHG_ILIM] = {
 322                 .mask = RK818_IRQ_DISCHG_ILIM_MSK,
 323                 .reg_offset = 1,
 324         },
 325 };
 326
 327 static struct regmap_irq_chip rk805_irq_chip = {
 328         .name = "rk805",
 329         .irqs = rk805_irqs,
 330         .num_irqs = ARRAY_SIZE(rk805_irqs),
 331         .num_regs = 1,
 332         .status_base = RK805_INT_STS_REG,
 333         .mask_base = RK805_INT_STS_MSK_REG,
 334         .ack_base = RK805_INT_STS_REG,
 335         .init_ack_masked = true,
 336 };
 337
 338 static const struct regmap_irq_chip rk808_irq_chip = {
 339         .name = "rk808",
 340         .irqs = rk808_irqs,
 341         .num_irqs = ARRAY_SIZE(rk808_irqs),
 342         .num_regs = 2,
 343         .irq_reg_stride = 2,
 344         .status_base = RK808_INT_STS_REG1,
 345         .mask_base = RK808_INT_STS_MSK_REG1,
 346         .ack_base = RK808_INT_STS_REG1,
 347         .init_ack_masked = true,
 348 };
 349
 350 static const struct regmap_irq_chip rk818_irq_chip = {
 351         .name = "rk818",
 352         .irqs = rk818_irqs,
 353         .num_irqs = ARRAY_SIZE(rk818_irqs),
 354         .num_regs = 2,
 355         .irq_reg_stride = 2,
 356         .status_base = RK818_INT_STS_REG1,
 357         .mask_base = RK818_INT_STS_MSK_REG1,
 358         .ack_base = RK818_INT_STS_REG1,
 359         .init_ack_masked = true,
 360 };
 361
 362 static struct i2c_client *rk808_i2c_client;
 363
 364 static void rk805_device_shutdown(void)
 365 {
 366         int ret;
 367         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 368
 369         if (!rk808) {
 370                 dev_warn(&rk808_i2c_client->dev,
 371                          "have no rk805, so do nothing here\n");
 372                 return;
 373         }
 374
 375         ret = regmap_update_bits(rk808->regmap,
 376                                  RK805_DEV_CTRL_REG,
 377                                  DEV_OFF, DEV_OFF);
 378         if (ret)
 379                 dev_err(&rk808_i2c_client->dev, "power off error!\n");
 380 }
 381
 382 static void rk808_device_shutdown(void)
 383 {
 384         int ret;
 385         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 386
 387         if (!rk808) {
 388                 dev_warn(&rk808_i2c_client->dev,
 389                          "have no rk808, so do nothing here\n");
 390                 return;
 391         }
 392
 393         ret = regmap_update_bits(rk808->regmap,
 394                                  RK808_DEVCTRL_REG,
 395                                  DEV_OFF_RST, DEV_OFF_RST);
 396         if (ret)
 397                 dev_err(&rk808_i2c_client->dev, "power off error!\n");
 398 }
 399
 400 static void rk818_device_shutdown(void)
 401 {
 402         int ret;
 403         struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 404
 405         if (!rk808) {
 406                 dev_warn(&rk808_i2c_client->dev,
 407                          "have no rk818, so do nothing here\n");
 408                 return;
 409         }
 410
 411         ret = regmap_update_bits(rk808->regmap,
 412                                  RK818_DEVCTRL_REG,
 413                                  DEV_OFF, DEV_OFF);
 414         if (ret)
 415                 dev_err(&rk808_i2c_client->dev, "power off error!\n");
 416 }
 417
 418 static const struct of_device_id rk808_of_match[] = {
 419         { .compatible = "rockchip,rk805" },
 420         { .compatible = "rockchip,rk808" },
 421         { .compatible = "rockchip,rk818" },
 422         { },
 423 };
 424 MODULE_DEVICE_TABLE(of, rk808_of_match);
 425
 426 static int rk808_probe(struct i2c_client *client,
 427                        const struct i2c_device_id *id)
 428 {
 429         struct device_node *np = client->dev.of_node;
 430         struct rk808 *rk808;
 431         const struct rk808_reg_data *pre_init_reg;
 432         const struct mfd_cell *cells;
 433         void (*pm_pwroff_fn)(void);
 434         int nr_pre_init_regs;
 435         int nr_cells;
 436         int pm_off = 0, msb, lsb;
 437         int ret;
 438         int i;
 439
 440         rk808 = devm_kzalloc(&client->dev, sizeof(*rk808), GFP_KERNEL);
 441         if (!rk808)
 442                 return -ENOMEM;
 443
 444         /* Read chip variant */
 445         msb = i2c_smbus_read_byte_data(client, RK808_ID_MSB);
 446         if (msb < 0) {
 447                 dev_err(&client->dev, "failed to read the chip id at 0x%x\n",
 448                         RK808_ID_MSB);
 449                 return msb;
 450         }
 451
 452         lsb = i2c_smbus_read_byte_data(client, RK808_ID_LSB);
 453         if (lsb < 0) {
 454                 dev_err(&client->dev, "failed to read the chip id at 0x%x\n",
 455                         RK808_ID_LSB);
 456                 return lsb;
 457         }
 458
 459         rk808->variant = ((msb << 8) | lsb) & RK8XX_ID_MSK;
 460         dev_info(&client->dev, "chip id: 0x%x\n", (unsigned int)rk808->variant);
 461
 462         switch (rk808->variant) {
 463         case RK805_ID:
 464                 rk808->regmap_cfg = &rk805_regmap_config;
 465                 rk808->regmap_irq_chip = &rk805_irq_chip;
 466                 pre_init_reg = rk805_pre_init_reg;
 467                 nr_pre_init_regs = ARRAY_SIZE(rk805_pre_init_reg);
 468                 cells = rk805s;
 469                 nr_cells = ARRAY_SIZE(rk805s);
 470                 pm_pwroff_fn = rk805_device_shutdown;
 471                 break;
 472         case RK808_ID:
 473                 rk808->regmap_cfg = &rk808_regmap_config;
 474                 rk808->regmap_irq_chip = &rk808_irq_chip;
 475                 pre_init_reg = rk808_pre_init_reg;
 476                 nr_pre_init_regs = ARRAY_SIZE(rk808_pre_init_reg);
 477                 cells = rk808s;
 478                 nr_cells = ARRAY_SIZE(rk808s);
 479                 pm_pwroff_fn = rk808_device_shutdown;
 480                 break;
 481         case RK818_ID:
 482                 rk808->regmap_cfg = &rk818_regmap_config;
 483                 rk808->regmap_irq_chip = &rk818_irq_chip;
 484                 pre_init_reg = rk818_pre_init_reg;
 485                 nr_pre_init_regs = ARRAY_SIZE(rk818_pre_init_reg);
 486                 cells = rk818s;
 487                 nr_cells = ARRAY_SIZE(rk818s);
 488                 pm_pwroff_fn = rk818_device_shutdown;
 489                 break;
 490         default:
 491                 dev_err(&client->dev, "Unsupported RK8XX ID %lu\n",
 492                         rk808->variant);
 493                 return -EINVAL;
 494         }
 495
 496         rk808->i2c = client;
 497         i2c_set_clientdata(client, rk808);
 498
 499         rk808->regmap = devm_regmap_init_i2c(client, rk808->regmap_cfg);
 500         if (IS_ERR(rk808->regmap)) {
 501                 dev_err(&client->dev, "regmap initialization failed\n");
 502                 return PTR_ERR(rk808->regmap);
 503         }
 504
 505         if (!client->irq) {
 506                 dev_err(&client->dev, "No interrupt support, no core IRQ\n");
 507                 return -EINVAL;
 508         }
 509
 510         ret = regmap_add_irq_chip(rk808->regmap, client->irq,
 511                                   IRQF_ONESHOT, -1,
 512                                   rk808->regmap_irq_chip, &rk808->irq_data);
 513         if (ret) {
 514                 dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
 515                 return ret;
 516         }
 517
 518         for (i = 0; i < nr_pre_init_regs; i++) {
 519                 ret = regmap_update_bits(rk808->regmap,
 520                                         pre_init_reg[i].addr,
 521                                         pre_init_reg[i].mask,
 522                                         pre_init_reg[i].value);
 523                 if (ret) {
 524                         dev_err(&client->dev,
 525                                 "0x%x write err\n",
 526                                 pre_init_reg[i].addr);
 527                         return ret;
 528                 }
 529         }
 530
 531         ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
 532                               cells, nr_cells, NULL, 0,
 533                               regmap_irq_get_domain(rk808->irq_data));
 534         if (ret) {
 535                 dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
 536                 goto err_irq;
 537         }
 538
 539         pm_off = of_property_read_bool(np,
 540                                 "rockchip,system-power-controller");
 541         if (pm_off && !pm_power_off) {
 542                 rk808_i2c_client = client;
 543                 pm_power_off = pm_pwroff_fn;
 544         }
 545
 546         return 0;
 547
 548 err_irq:
 549         regmap_del_irq_chip(client->irq, rk808->irq_data);
 550         return ret;
 551 }
 552
 553 static int rk808_remove(struct i2c_client *client)
 554 {
 555         struct rk808 *rk808 = i2c_get_clientdata(client);
 556
 557         regmap_del_irq_chip(client->irq, rk808->irq_data);
 558         pm_power_off = NULL;
 559
 560         return 0;
 561 }
 562
 563 static struct i2c_driver rk808_i2c_driver = {
 564         .driver = {
 565                 .name = "rk808",
 566                 .of_match_table = rk808_of_match,
 567         },
 568         .probe    = rk808_probe,
 569         .remove   = rk808_remove,
 570 };
 571
 572 module_i2c_driver(rk808_i2c_driver);
 573
 574 MODULE_LICENSE("GPL");
 575 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
 576 MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
 577 MODULE_AUTHOR("Wadim Egorov <w.egorov@phytec.de>");
 578 MODULE_DESCRIPTION("RK808/RK818 PMIC driver");