drivers/mfd/twl4030-power.c

   1 /*
   2  * linux/drivers/i2c/chips/twl4030-power.c
   3  *
   4  * Handle TWL4030 Power initialization
   5  *
   6  * Copyright (C) 2008 Nokia Corporation
   7  * Copyright (C) 2006 Texas Instruments, Inc
   8  *
   9  * Written by   Kalle Jokiniemi
  10  *              Peter De Schrijver <peter.de-schrijver@nokia.com>
  11  * Several fixes by Amit Kucheria <amit.kucheria@verdurent.com>
  12  *
  13  * This file is subject to the terms and conditions of the GNU General
  14  * Public License. See the file "COPYING" in the main directory of this
  15  * archive for more details.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/pm.h>
  29 #include <linux/i2c/twl.h>
  30 #include <linux/platform_device.h>
  31
  32 #include <asm/mach-types.h>
  33
  34 static u8 twl4030_start_script_address = 0x2b;
  35
  36 #define PWR_P1_SW_EVENTS        0x10
  37 #define PWR_DEVOFF              (1 << 0)
  38 #define SEQ_OFFSYNC             (1 << 0)
  39
  40 #define PHY_TO_OFF_PM_MASTER(p)         (p - 0x36)
  41 #define PHY_TO_OFF_PM_RECEIVER(p)       (p - 0x5b)
  42
  43 /* resource - hfclk */
  44 #define R_HFCLKOUT_DEV_GRP      PHY_TO_OFF_PM_RECEIVER(0xe6)
  45
  46 /* PM events */
  47 #define R_P1_SW_EVENTS          PHY_TO_OFF_PM_MASTER(0x46)
  48 #define R_P2_SW_EVENTS          PHY_TO_OFF_PM_MASTER(0x47)
  49 #define R_P3_SW_EVENTS          PHY_TO_OFF_PM_MASTER(0x48)
  50 #define R_CFG_P1_TRANSITION     PHY_TO_OFF_PM_MASTER(0x36)
  51 #define R_CFG_P2_TRANSITION     PHY_TO_OFF_PM_MASTER(0x37)
  52 #define R_CFG_P3_TRANSITION     PHY_TO_OFF_PM_MASTER(0x38)
  53
  54 #define LVL_WAKEUP      0x08
  55
  56 #define ENABLE_WARMRESET (1<<4)
  57
  58 #define END_OF_SCRIPT           0x3f
  59
  60 #define R_SEQ_ADD_A2S           PHY_TO_OFF_PM_MASTER(0x55)
  61 #define R_SEQ_ADD_S2A12         PHY_TO_OFF_PM_MASTER(0x56)
  62 #define R_SEQ_ADD_S2A3          PHY_TO_OFF_PM_MASTER(0x57)
  63 #define R_SEQ_ADD_WARM          PHY_TO_OFF_PM_MASTER(0x58)
  64 #define R_MEMORY_ADDRESS        PHY_TO_OFF_PM_MASTER(0x59)
  65 #define R_MEMORY_DATA           PHY_TO_OFF_PM_MASTER(0x5a)
  66
  67 /* resource configuration registers
  68    <RESOURCE>_DEV_GRP   at address 'n+0'
  69    <RESOURCE>_TYPE      at address 'n+1'
  70    <RESOURCE>_REMAP     at address 'n+2'
  71    <RESOURCE>_DEDICATED at address 'n+3'
  72 */
  73 #define DEV_GRP_OFFSET          0
  74 #define TYPE_OFFSET             1
  75 #define REMAP_OFFSET            2
  76 #define DEDICATED_OFFSET        3
  77
  78 /* Bit positions in the registers */
  79
  80 /* <RESOURCE>_DEV_GRP */
  81 #define DEV_GRP_SHIFT           5
  82 #define DEV_GRP_MASK            (7 << DEV_GRP_SHIFT)
  83
  84 /* <RESOURCE>_TYPE */
  85 #define TYPE_SHIFT              0
  86 #define TYPE_MASK               (7 << TYPE_SHIFT)
  87 #define TYPE2_SHIFT             3
  88 #define TYPE2_MASK              (3 << TYPE2_SHIFT)
  89
  90 /* <RESOURCE>_REMAP */
  91 #define SLEEP_STATE_SHIFT       0
  92 #define SLEEP_STATE_MASK        (0xf << SLEEP_STATE_SHIFT)
  93 #define OFF_STATE_SHIFT         4
  94 #define OFF_STATE_MASK          (0xf << OFF_STATE_SHIFT)
  95
  96 static u8 res_config_addrs[] = {
  97         [RES_VAUX1]     = 0x17,
  98         [RES_VAUX2]     = 0x1b,
  99         [RES_VAUX3]     = 0x1f,
 100         [RES_VAUX4]     = 0x23,
 101         [RES_VMMC1]     = 0x27,
 102         [RES_VMMC2]     = 0x2b,
 103         [RES_VPLL1]     = 0x2f,
 104         [RES_VPLL2]     = 0x33,
 105         [RES_VSIM]      = 0x37,
 106         [RES_VDAC]      = 0x3b,
 107         [RES_VINTANA1]  = 0x3f,
 108         [RES_VINTANA2]  = 0x43,
 109         [RES_VINTDIG]   = 0x47,
 110         [RES_VIO]       = 0x4b,
 111         [RES_VDD1]      = 0x55,
 112         [RES_VDD2]      = 0x63,
 113         [RES_VUSB_1V5]  = 0x71,
 114         [RES_VUSB_1V8]  = 0x74,
 115         [RES_VUSB_3V1]  = 0x77,
 116         [RES_VUSBCP]    = 0x7a,
 117         [RES_REGEN]     = 0x7f,
 118         [RES_NRES_PWRON] = 0x82,
 119         [RES_CLKEN]     = 0x85,
 120         [RES_SYSEN]     = 0x88,
 121         [RES_HFCLKOUT]  = 0x8b,
 122         [RES_32KCLKOUT] = 0x8e,
 123         [RES_RESET]     = 0x91,
 124         [RES_MAIN_REF]  = 0x94,
 125 };
 126
 127 static int __init twl4030_write_script_byte(u8 address, u8 byte)
 128 {
 129         int err;
 130
 131         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
 132                                 R_MEMORY_ADDRESS);
 133         if (err)
 134                 goto out;
 135         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, byte,
 136                                 R_MEMORY_DATA);
 137 out:
 138         return err;
 139 }
 140
 141 static int __init twl4030_write_script_ins(u8 address, u16 pmb_message,
 142                                            u8 delay, u8 next)
 143 {
 144         int err;
 145
 146         address *= 4;
 147         err = twl4030_write_script_byte(address++, pmb_message >> 8);
 148         if (err)
 149                 goto out;
 150         err = twl4030_write_script_byte(address++, pmb_message & 0xff);
 151         if (err)
 152                 goto out;
 153         err = twl4030_write_script_byte(address++, delay);
 154         if (err)
 155                 goto out;
 156         err = twl4030_write_script_byte(address++, next);
 157 out:
 158         return err;
 159 }
 160
 161 static int __init twl4030_write_script(u8 address, struct twl4030_ins *script,
 162                                        int len)
 163 {
 164         int err;
 165
 166         for (; len; len--, address++, script++) {
 167                 if (len == 1) {
 168                         err = twl4030_write_script_ins(address,
 169                                                 script->pmb_message,
 170                                                 script->delay,
 171                                                 END_OF_SCRIPT);
 172                         if (err)
 173                                 break;
 174                 } else {
 175                         err = twl4030_write_script_ins(address,
 176                                                 script->pmb_message,
 177                                                 script->delay,
 178                                                 address + 1);
 179                         if (err)
 180                                 break;
 181                 }
 182         }
 183         return err;
 184 }
 185
 186 static int __init twl4030_config_wakeup3_sequence(u8 address)
 187 {
 188         int err;
 189         u8 data;
 190
 191         /* Set SLEEP to ACTIVE SEQ address for P3 */
 192         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
 193                                 R_SEQ_ADD_S2A3);
 194         if (err)
 195                 goto out;
 196
 197         /* P3 LVL_WAKEUP should be on LEVEL */
 198         err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
 199                                 R_P3_SW_EVENTS);
 200         if (err)
 201                 goto out;
 202         data |= LVL_WAKEUP;
 203         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data,
 204                                 R_P3_SW_EVENTS);
 205 out:
 206         if (err)
 207                 pr_err("TWL4030 wakeup sequence for P3 config error\n");
 208         return err;
 209 }
 210
 211 static int __init twl4030_config_wakeup12_sequence(u8 address)
 212 {
 213         int err = 0;
 214         u8 data;
 215
 216         /* Set SLEEP to ACTIVE SEQ address for P1 and P2 */
 217         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
 218                                 R_SEQ_ADD_S2A12);
 219         if (err)
 220                 goto out;
 221
 222         /* P1/P2 LVL_WAKEUP should be on LEVEL */
 223         err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
 224                                 R_P1_SW_EVENTS);
 225         if (err)
 226                 goto out;
 227
 228         data |= LVL_WAKEUP;
 229         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data,
 230                                 R_P1_SW_EVENTS);
 231         if (err)
 232                 goto out;
 233
 234         err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
 235                                 R_P2_SW_EVENTS);
 236         if (err)
 237                 goto out;
 238
 239         data |= LVL_WAKEUP;
 240         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data,
 241                                 R_P2_SW_EVENTS);
 242         if (err)
 243                 goto out;
 244
 245         if (machine_is_omap_3430sdp() || machine_is_omap_ldp()) {
 246                 /* Disabling AC charger effect on sleep-active transitions */
 247                 err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &data,
 248                                         R_CFG_P1_TRANSITION);
 249                 if (err)
 250                         goto out;
 251                 data &= ~(1<<1);
 252                 err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, data ,
 253                                         R_CFG_P1_TRANSITION);
 254                 if (err)
 255                         goto out;
 256         }
 257
 258 out:
 259         if (err)
 260                 pr_err("TWL4030 wakeup sequence for P1 and P2" \
 261                         "config error\n");
 262         return err;
 263 }
 264
 265 static int __init twl4030_config_sleep_sequence(u8 address)
 266 {
 267         int err;
 268
 269         /* Set ACTIVE to SLEEP SEQ address in T2 memory*/
 270         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
 271                                 R_SEQ_ADD_A2S);
 272
 273         if (err)
 274                 pr_err("TWL4030 sleep sequence config error\n");
 275
 276         return err;
 277 }
 278
 279 static int __init twl4030_config_warmreset_sequence(u8 address)
 280 {
 281         int err;
 282         u8 rd_data;
 283
 284         /* Set WARM RESET SEQ address for P1 */
 285         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, address,
 286                                 R_SEQ_ADD_WARM);
 287         if (err)
 288                 goto out;
 289
 290         /* P1/P2/P3 enable WARMRESET */
 291         err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
 292                                 R_P1_SW_EVENTS);
 293         if (err)
 294                 goto out;
 295
 296         rd_data |= ENABLE_WARMRESET;
 297         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
 298                                 R_P1_SW_EVENTS);
 299         if (err)
 300                 goto out;
 301
 302         err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
 303                                 R_P2_SW_EVENTS);
 304         if (err)
 305                 goto out;
 306
 307         rd_data |= ENABLE_WARMRESET;
 308         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
 309                                 R_P2_SW_EVENTS);
 310         if (err)
 311                 goto out;
 312
 313         err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &rd_data,
 314                                 R_P3_SW_EVENTS);
 315         if (err)
 316                 goto out;
 317
 318         rd_data |= ENABLE_WARMRESET;
 319         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, rd_data,
 320                                 R_P3_SW_EVENTS);
 321 out:
 322         if (err)
 323                 pr_err("TWL4030 warmreset seq config error\n");
 324         return err;
 325 }
 326
 327 static int __init twl4030_configure_resource(struct twl4030_resconfig *rconfig)
 328 {
 329         int rconfig_addr;
 330         int err;
 331         u8 type;
 332         u8 grp;
 333         u8 remap;
 334
 335         if (rconfig->resource > TOTAL_RESOURCES) {
 336                 pr_err("TWL4030 Resource %d does not exist\n",
 337                         rconfig->resource);
 338                 return -EINVAL;
 339         }
 340
 341         rconfig_addr = res_config_addrs[rconfig->resource];
 342
 343         /* Set resource group */
 344         err = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &grp,
 345                               rconfig_addr + DEV_GRP_OFFSET);
 346         if (err) {
 347                 pr_err("TWL4030 Resource %d group could not be read\n",
 348                         rconfig->resource);
 349                 return err;
 350         }
 351
 352         if (rconfig->devgroup != TWL4030_RESCONFIG_UNDEF) {
 353                 grp &= ~DEV_GRP_MASK;
 354                 grp |= rconfig->devgroup << DEV_GRP_SHIFT;
 355                 err = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
 356                                        grp, rconfig_addr + DEV_GRP_OFFSET);
 357                 if (err < 0) {
 358                         pr_err("TWL4030 failed to program devgroup\n");
 359                         return err;
 360                 }
 361         }
 362
 363         /* Set resource types */
 364         err = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &type,
 365                                 rconfig_addr + TYPE_OFFSET);
 366         if (err < 0) {
 367                 pr_err("TWL4030 Resource %d type could not be read\n",
 368                         rconfig->resource);
 369                 return err;
 370         }
 371
 372         if (rconfig->type != TWL4030_RESCONFIG_UNDEF) {
 373                 type &= ~TYPE_MASK;
 374                 type |= rconfig->type << TYPE_SHIFT;
 375         }
 376
 377         if (rconfig->type2 != TWL4030_RESCONFIG_UNDEF) {
 378                 type &= ~TYPE2_MASK;
 379                 type |= rconfig->type2 << TYPE2_SHIFT;
 380         }
 381
 382         err = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
 383                                 type, rconfig_addr + TYPE_OFFSET);
 384         if (err < 0) {
 385                 pr_err("TWL4030 failed to program resource type\n");
 386                 return err;
 387         }
 388
 389         /* Set remap states */
 390         err = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &remap,
 391                               rconfig_addr + REMAP_OFFSET);
 392         if (err < 0) {
 393                 pr_err("TWL4030 Resource %d remap could not be read\n",
 394                         rconfig->resource);
 395                 return err;
 396         }
 397
 398         if (rconfig->remap_off != TWL4030_RESCONFIG_UNDEF) {
 399                 remap &= ~OFF_STATE_MASK;
 400                 remap |= rconfig->remap_off << OFF_STATE_SHIFT;
 401         }
 402
 403         if (rconfig->remap_sleep != TWL4030_RESCONFIG_UNDEF) {
 404                 remap &= ~SLEEP_STATE_MASK;
 405                 remap |= rconfig->remap_sleep << SLEEP_STATE_SHIFT;
 406         }
 407
 408         err = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
 409                                remap,
 410                                rconfig_addr + REMAP_OFFSET);
 411         if (err < 0) {
 412                 pr_err("TWL4030 failed to program remap\n");
 413                 return err;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int __init load_twl4030_script(struct twl4030_script *tscript,
 420                u8 address)
 421 {
 422         int err;
 423         static int order;
 424
 425         /* Make sure the script isn't going beyond last valid address (0x3f) */
 426         if ((address + tscript->size) > END_OF_SCRIPT) {
 427                 pr_err("TWL4030 scripts too big error\n");
 428                 return -EINVAL;
 429         }
 430
 431         err = twl4030_write_script(address, tscript->script, tscript->size);
 432         if (err)
 433                 goto out;
 434
 435         if (tscript->flags & TWL4030_WRST_SCRIPT) {
 436                 err = twl4030_config_warmreset_sequence(address);
 437                 if (err)
 438                         goto out;
 439         }
 440         if (tscript->flags & TWL4030_WAKEUP12_SCRIPT) {
 441                 err = twl4030_config_wakeup12_sequence(address);
 442                 if (err)
 443                         goto out;
 444         }
 445         if (tscript->flags & TWL4030_WAKEUP3_SCRIPT) {
 446                 err = twl4030_config_wakeup3_sequence(address);
 447                 if (err)
 448                         goto out;
 449                 order = 1;
 450         }
 451         if (tscript->flags & TWL4030_SLEEP_SCRIPT) {
 452                 if (!order)
 453                         pr_warning("TWL4030: Bad order of scripts (sleep "\
 454                                         "script before wakeup) Leads to boot"\
 455                                         "failure on some boards\n");
 456                 err = twl4030_config_sleep_sequence(address);
 457         }
 458 out:
 459         return err;
 460 }
 461
 462 int twl4030_remove_script(u8 flags)
 463 {
 464         int err = 0;
 465
 466         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 467                         TWL4030_PM_MASTER_KEY_CFG1,
 468                         TWL4030_PM_MASTER_PROTECT_KEY);
 469         if (err) {
 470                 pr_err("twl4030: unable to unlock PROTECT_KEY\n");
 471                 return err;
 472         }
 473
 474         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 475                         TWL4030_PM_MASTER_KEY_CFG2,
 476                         TWL4030_PM_MASTER_PROTECT_KEY);
 477         if (err) {
 478                 pr_err("twl4030: unable to unlock PROTECT_KEY\n");
 479                 return err;
 480         }
 481
 482         if (flags & TWL4030_WRST_SCRIPT) {
 483                 err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT,
 484                                 R_SEQ_ADD_WARM);
 485                 if (err)
 486                         return err;
 487         }
 488         if (flags & TWL4030_WAKEUP12_SCRIPT) {
 489                 err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT,
 490                                 R_SEQ_ADD_S2A12);
 491                 if (err)
 492                         return err;
 493         }
 494         if (flags & TWL4030_WAKEUP3_SCRIPT) {
 495                 err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT,
 496                                 R_SEQ_ADD_S2A3);
 497                 if (err)
 498                         return err;
 499         }
 500         if (flags & TWL4030_SLEEP_SCRIPT) {
 501                 err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, END_OF_SCRIPT,
 502                                 R_SEQ_ADD_A2S);
 503                 if (err)
 504                         return err;
 505         }
 506
 507         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0,
 508                         TWL4030_PM_MASTER_PROTECT_KEY);
 509         if (err)
 510                 pr_err("TWL4030 Unable to relock registers\n");
 511
 512         return err;
 513 }
 514
 515 /*
 516  * In master mode, start the power off sequence.
 517  * After a successful execution, TWL shuts down the power to the SoC
 518  * and all peripherals connected to it.
 519  */
 520 void twl4030_power_off(void)
 521 {
 522         int err;
 523
 524         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, PWR_DEVOFF,
 525                                TWL4030_PM_MASTER_P1_SW_EVENTS);
 526         if (err)
 527                 pr_err("TWL4030 Unable to power off\n");
 528 }
 529
 530 void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts)
 531 {
 532         int err = 0;
 533         int i;
 534         struct twl4030_resconfig *resconfig;
 535         u8 val, address = twl4030_start_script_address;
 536
 537         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 538                         TWL4030_PM_MASTER_KEY_CFG1,
 539                         TWL4030_PM_MASTER_PROTECT_KEY);
 540         if (err)
 541                 goto unlock;
 542
 543         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 544                         TWL4030_PM_MASTER_KEY_CFG2,
 545                         TWL4030_PM_MASTER_PROTECT_KEY);
 546         if (err)
 547                 goto unlock;
 548
 549         for (i = 0; i < twl4030_scripts->num; i++) {
 550                 err = load_twl4030_script(twl4030_scripts->scripts[i], address);
 551                 if (err)
 552                         goto load;
 553                 address += twl4030_scripts->scripts[i]->size;
 554         }
 555
 556         resconfig = twl4030_scripts->resource_config;
 557         if (resconfig) {
 558                 while (resconfig->resource) {
 559                         err = twl4030_configure_resource(resconfig);
 560                         if (err)
 561                                 goto resource;
 562                         resconfig++;
 563
 564                 }
 565         }
 566
 567         /* Board has to be wired properly to use this feature */
 568         if (twl4030_scripts->use_poweroff && !pm_power_off) {
 569                 /* Default for SEQ_OFFSYNC is set, lets ensure this */
 570                 err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &val,
 571                                       TWL4030_PM_MASTER_CFG_P123_TRANSITION);
 572                 if (err) {
 573                         pr_warning("TWL4030 Unable to read registers\n");
 574
 575                 } else if (!(val & SEQ_OFFSYNC)) {
 576                         val |= SEQ_OFFSYNC;
 577                         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, val,
 578                                         TWL4030_PM_MASTER_CFG_P123_TRANSITION);
 579                         if (err) {
 580                                 pr_err("TWL4030 Unable to setup SEQ_OFFSYNC\n");
 581                                 goto relock;
 582                         }
 583                 }
 584
 585                 pm_power_off = twl4030_power_off;
 586         }
 587
 588 relock:
 589         err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0,
 590                         TWL4030_PM_MASTER_PROTECT_KEY);
 591         if (err)
 592                 pr_err("TWL4030 Unable to relock registers\n");
 593         return;
 594
 595 unlock:
 596         if (err)
 597                 pr_err("TWL4030 Unable to unlock registers\n");
 598         return;
 599 load:
 600         if (err)
 601                 pr_err("TWL4030 failed to load scripts\n");
 602         return;
 603 resource:
 604         if (err)
 605                 pr_err("TWL4030 failed to configure resource\n");
 606         return;
 607 }