drivers/of/platform.c

   1 /*
   2  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
   3  *                       <benh@kernel.crashing.org>
   4  *    and                Arnd Bergmann, IBM Corp.
   5  *    Merged from powerpc/kernel/of_platform.c and
   6  *    sparc{,64}/kernel/of_device.c by Stephen Rothwell
   7  *
   8  *  This program is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU General Public License
  10  *  as published by the Free Software Foundation; either version
  11  *  2 of the License, or (at your option) any later version.
  12  *
  13  */
  14 #include <linux/errno.h>
  15 #include <linux/module.h>
  16 #include <linux/device.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/slab.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_device.h>
  21 #include <linux/of_irq.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/platform_device.h>
  24
  25 static int platform_driver_probe_shim(struct platform_device *pdev)
  26 {
  27         struct platform_driver *pdrv;
  28         struct of_platform_driver *ofpdrv;
  29         const struct of_device_id *match;
  30
  31         pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
  32         ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
  33
  34         /* There is an unlikely chance that an of_platform driver might match
  35          * on a non-OF platform device.  If so, then of_match_device() will
  36          * come up empty.  Return -EINVAL in this case so other drivers get
  37          * the chance to bind. */
  38         match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
  39         return match ? ofpdrv->probe(pdev, match) : -EINVAL;
  40 }
  41
  42 static void platform_driver_shutdown_shim(struct platform_device *pdev)
  43 {
  44         struct platform_driver *pdrv;
  45         struct of_platform_driver *ofpdrv;
  46
  47         pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
  48         ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
  49         ofpdrv->shutdown(pdev);
  50 }
  51
  52 /**
  53  * of_register_platform_driver
  54  */
  55 int of_register_platform_driver(struct of_platform_driver *drv)
  56 {
  57         /* setup of_platform_driver to platform_driver adaptors */
  58         drv->platform_driver.driver = drv->driver;
  59         if (drv->probe)
  60                 drv->platform_driver.probe = platform_driver_probe_shim;
  61         drv->platform_driver.remove = drv->remove;
  62         if (drv->shutdown)
  63                 drv->platform_driver.shutdown = platform_driver_shutdown_shim;
  64         drv->platform_driver.suspend = drv->suspend;
  65         drv->platform_driver.resume = drv->resume;
  66
  67         return platform_driver_register(&drv->platform_driver);
  68 }
  69 EXPORT_SYMBOL(of_register_platform_driver);
  70
  71 void of_unregister_platform_driver(struct of_platform_driver *drv)
  72 {
  73         platform_driver_unregister(&drv->platform_driver);
  74 }
  75 EXPORT_SYMBOL(of_unregister_platform_driver);
  76
  77 #if defined(CONFIG_PPC_DCR)
  78 #include <asm/dcr.h>
  79 #endif
  80
  81 extern struct device_attribute of_platform_device_attrs[];
  82
  83 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
  84 {
  85         const struct of_device_id *matches = drv->of_match_table;
  86
  87         if (!matches)
  88                 return 0;
  89
  90         return of_match_device(matches, dev) != NULL;
  91 }
  92
  93 static int of_platform_device_probe(struct device *dev)
  94 {
  95         int error = -ENODEV;
  96         struct of_platform_driver *drv;
  97         struct of_device *of_dev;
  98         const struct of_device_id *match;
  99
 100         drv = to_of_platform_driver(dev->driver);
 101         of_dev = to_of_device(dev);
 102
 103         if (!drv->probe)
 104                 return error;
 105
 106         of_dev_get(of_dev);
 107
 108         match = of_match_device(drv->driver.of_match_table, dev);
 109         if (match)
 110                 error = drv->probe(of_dev, match);
 111         if (error)
 112                 of_dev_put(of_dev);
 113
 114         return error;
 115 }
 116
 117 static int of_platform_device_remove(struct device *dev)
 118 {
 119         struct of_device *of_dev = to_of_device(dev);
 120         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 121
 122         if (dev->driver && drv->remove)
 123                 drv->remove(of_dev);
 124         return 0;
 125 }
 126
 127 static void of_platform_device_shutdown(struct device *dev)
 128 {
 129         struct of_device *of_dev = to_of_device(dev);
 130         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 131
 132         if (dev->driver && drv->shutdown)
 133                 drv->shutdown(of_dev);
 134 }
 135
 136 #ifdef CONFIG_PM_SLEEP
 137
 138 static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 139 {
 140         struct of_device *of_dev = to_of_device(dev);
 141         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 142         int ret = 0;
 143
 144         if (dev->driver && drv->suspend)
 145                 ret = drv->suspend(of_dev, mesg);
 146         return ret;
 147 }
 148
 149 static int of_platform_legacy_resume(struct device *dev)
 150 {
 151         struct of_device *of_dev = to_of_device(dev);
 152         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 153         int ret = 0;
 154
 155         if (dev->driver && drv->resume)
 156                 ret = drv->resume(of_dev);
 157         return ret;
 158 }
 159
 160 static int of_platform_pm_prepare(struct device *dev)
 161 {
 162         struct device_driver *drv = dev->driver;
 163         int ret = 0;
 164
 165         if (drv && drv->pm && drv->pm->prepare)
 166                 ret = drv->pm->prepare(dev);
 167
 168         return ret;
 169 }
 170
 171 static void of_platform_pm_complete(struct device *dev)
 172 {
 173         struct device_driver *drv = dev->driver;
 174
 175         if (drv && drv->pm && drv->pm->complete)
 176                 drv->pm->complete(dev);
 177 }
 178
 179 #ifdef CONFIG_SUSPEND
 180
 181 static int of_platform_pm_suspend(struct device *dev)
 182 {
 183         struct device_driver *drv = dev->driver;
 184         int ret = 0;
 185
 186         if (!drv)
 187                 return 0;
 188
 189         if (drv->pm) {
 190                 if (drv->pm->suspend)
 191                         ret = drv->pm->suspend(dev);
 192         } else {
 193                 ret = of_platform_legacy_suspend(dev, PMSG_SUSPEND);
 194         }
 195
 196         return ret;
 197 }
 198
 199 static int of_platform_pm_suspend_noirq(struct device *dev)
 200 {
 201         struct device_driver *drv = dev->driver;
 202         int ret = 0;
 203
 204         if (!drv)
 205                 return 0;
 206
 207         if (drv->pm) {
 208                 if (drv->pm->suspend_noirq)
 209                         ret = drv->pm->suspend_noirq(dev);
 210         }
 211
 212         return ret;
 213 }
 214
 215 static int of_platform_pm_resume(struct device *dev)
 216 {
 217         struct device_driver *drv = dev->driver;
 218         int ret = 0;
 219
 220         if (!drv)
 221                 return 0;
 222
 223         if (drv->pm) {
 224                 if (drv->pm->resume)
 225                         ret = drv->pm->resume(dev);
 226         } else {
 227                 ret = of_platform_legacy_resume(dev);
 228         }
 229
 230         return ret;
 231 }
 232
 233 static int of_platform_pm_resume_noirq(struct device *dev)
 234 {
 235         struct device_driver *drv = dev->driver;
 236         int ret = 0;
 237
 238         if (!drv)
 239                 return 0;
 240
 241         if (drv->pm) {
 242                 if (drv->pm->resume_noirq)
 243                         ret = drv->pm->resume_noirq(dev);
 244         }
 245
 246         return ret;
 247 }
 248
 249 #else /* !CONFIG_SUSPEND */
 250
 251 #define of_platform_pm_suspend          NULL
 252 #define of_platform_pm_resume           NULL
 253 #define of_platform_pm_suspend_noirq    NULL
 254 #define of_platform_pm_resume_noirq     NULL
 255
 256 #endif /* !CONFIG_SUSPEND */
 257
 258 #ifdef CONFIG_HIBERNATION
 259
 260 static int of_platform_pm_freeze(struct device *dev)
 261 {
 262         struct device_driver *drv = dev->driver;
 263         int ret = 0;
 264
 265         if (!drv)
 266                 return 0;
 267
 268         if (drv->pm) {
 269                 if (drv->pm->freeze)
 270                         ret = drv->pm->freeze(dev);
 271         } else {
 272                 ret = of_platform_legacy_suspend(dev, PMSG_FREEZE);
 273         }
 274
 275         return ret;
 276 }
 277
 278 static int of_platform_pm_freeze_noirq(struct device *dev)
 279 {
 280         struct device_driver *drv = dev->driver;
 281         int ret = 0;
 282
 283         if (!drv)
 284                 return 0;
 285
 286         if (drv->pm) {
 287                 if (drv->pm->freeze_noirq)
 288                         ret = drv->pm->freeze_noirq(dev);
 289         }
 290
 291         return ret;
 292 }
 293
 294 static int of_platform_pm_thaw(struct device *dev)
 295 {
 296         struct device_driver *drv = dev->driver;
 297         int ret = 0;
 298
 299         if (!drv)
 300                 return 0;
 301
 302         if (drv->pm) {
 303                 if (drv->pm->thaw)
 304                         ret = drv->pm->thaw(dev);
 305         } else {
 306                 ret = of_platform_legacy_resume(dev);
 307         }
 308
 309         return ret;
 310 }
 311
 312 static int of_platform_pm_thaw_noirq(struct device *dev)
 313 {
 314         struct device_driver *drv = dev->driver;
 315         int ret = 0;
 316
 317         if (!drv)
 318                 return 0;
 319
 320         if (drv->pm) {
 321                 if (drv->pm->thaw_noirq)
 322                         ret = drv->pm->thaw_noirq(dev);
 323         }
 324
 325         return ret;
 326 }
 327
 328 static int of_platform_pm_poweroff(struct device *dev)
 329 {
 330         struct device_driver *drv = dev->driver;
 331         int ret = 0;
 332
 333         if (!drv)
 334                 return 0;
 335
 336         if (drv->pm) {
 337                 if (drv->pm->poweroff)
 338                         ret = drv->pm->poweroff(dev);
 339         } else {
 340                 ret = of_platform_legacy_suspend(dev, PMSG_HIBERNATE);
 341         }
 342
 343         return ret;
 344 }
 345
 346 static int of_platform_pm_poweroff_noirq(struct device *dev)
 347 {
 348         struct device_driver *drv = dev->driver;
 349         int ret = 0;
 350
 351         if (!drv)
 352                 return 0;
 353
 354         if (drv->pm) {
 355                 if (drv->pm->poweroff_noirq)
 356                         ret = drv->pm->poweroff_noirq(dev);
 357         }
 358
 359         return ret;
 360 }
 361
 362 static int of_platform_pm_restore(struct device *dev)
 363 {
 364         struct device_driver *drv = dev->driver;
 365         int ret = 0;
 366
 367         if (!drv)
 368                 return 0;
 369
 370         if (drv->pm) {
 371                 if (drv->pm->restore)
 372                         ret = drv->pm->restore(dev);
 373         } else {
 374                 ret = of_platform_legacy_resume(dev);
 375         }
 376
 377         return ret;
 378 }
 379
 380 static int of_platform_pm_restore_noirq(struct device *dev)
 381 {
 382         struct device_driver *drv = dev->driver;
 383         int ret = 0;
 384
 385         if (!drv)
 386                 return 0;
 387
 388         if (drv->pm) {
 389                 if (drv->pm->restore_noirq)
 390                         ret = drv->pm->restore_noirq(dev);
 391         }
 392
 393         return ret;
 394 }
 395
 396 #else /* !CONFIG_HIBERNATION */
 397
 398 #define of_platform_pm_freeze           NULL
 399 #define of_platform_pm_thaw             NULL
 400 #define of_platform_pm_poweroff         NULL
 401 #define of_platform_pm_restore          NULL
 402 #define of_platform_pm_freeze_noirq     NULL
 403 #define of_platform_pm_thaw_noirq               NULL
 404 #define of_platform_pm_poweroff_noirq   NULL
 405 #define of_platform_pm_restore_noirq    NULL
 406
 407 #endif /* !CONFIG_HIBERNATION */
 408
 409 static struct dev_pm_ops of_platform_dev_pm_ops = {
 410         .prepare = of_platform_pm_prepare,
 411         .complete = of_platform_pm_complete,
 412         .suspend = of_platform_pm_suspend,
 413         .resume = of_platform_pm_resume,
 414         .freeze = of_platform_pm_freeze,
 415         .thaw = of_platform_pm_thaw,
 416         .poweroff = of_platform_pm_poweroff,
 417         .restore = of_platform_pm_restore,
 418         .suspend_noirq = of_platform_pm_suspend_noirq,
 419         .resume_noirq = of_platform_pm_resume_noirq,
 420         .freeze_noirq = of_platform_pm_freeze_noirq,
 421         .thaw_noirq = of_platform_pm_thaw_noirq,
 422         .poweroff_noirq = of_platform_pm_poweroff_noirq,
 423         .restore_noirq = of_platform_pm_restore_noirq,
 424 };
 425
 426 #define OF_PLATFORM_PM_OPS_PTR  (&of_platform_dev_pm_ops)
 427
 428 #else /* !CONFIG_PM_SLEEP */
 429
 430 #define OF_PLATFORM_PM_OPS_PTR  NULL
 431
 432 #endif /* !CONFIG_PM_SLEEP */
 433
 434 int of_bus_type_init(struct bus_type *bus, const char *name)
 435 {
 436         bus->name = name;
 437         bus->match = of_platform_bus_match;
 438         bus->probe = of_platform_device_probe;
 439         bus->remove = of_platform_device_remove;
 440         bus->shutdown = of_platform_device_shutdown;
 441         bus->dev_attrs = of_platform_device_attrs;
 442         bus->pm = OF_PLATFORM_PM_OPS_PTR;
 443         return bus_register(bus);
 444 }
 445
 446 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 447 {
 448         /*
 449          * Temporary: of_platform_bus used to be distinct from the platform
 450          * bus.  It isn't anymore, and so drivers on the platform bus need
 451          * to be registered in a special way.
 452          *
 453          * After all of_platform_bus_type drivers are converted to
 454          * platform_drivers, this exception can be removed.
 455          */
 456         if (bus == &platform_bus_type)
 457                 return of_register_platform_driver(drv);
 458
 459         /* register with core */
 460         drv->driver.bus = bus;
 461         return driver_register(&drv->driver);
 462 }
 463 EXPORT_SYMBOL(of_register_driver);
 464
 465 void of_unregister_driver(struct of_platform_driver *drv)
 466 {
 467         if (drv->driver.bus == &platform_bus_type)
 468                 of_unregister_platform_driver(drv);
 469         else
 470                 driver_unregister(&drv->driver);
 471 }
 472 EXPORT_SYMBOL(of_unregister_driver);
 473
 474 #if !defined(CONFIG_SPARC)
 475 /*
 476  * The following routines scan a subtree and registers a device for
 477  * each applicable node.
 478  *
 479  * Note: sparc doesn't use these routines because it has a different
 480  * mechanism for creating devices from device tree nodes.
 481  */
 482
 483 /**
 484  * of_device_make_bus_id - Use the device node data to assign a unique name
 485  * @dev: pointer to device structure that is linked to a device tree node
 486  *
 487  * This routine will first try using either the dcr-reg or the reg property
 488  * value to derive a unique name.  As a last resort it will use the node
 489  * name followed by a unique number.
 490  */
 491 static void of_device_make_bus_id(struct device *dev)
 492 {
 493         static atomic_t bus_no_reg_magic;
 494         struct device_node *node = dev->of_node;
 495         const u32 *reg;
 496         u64 addr;
 497         int magic;
 498
 499 #ifdef CONFIG_PPC_DCR
 500         /*
 501          * If it's a DCR based device, use 'd' for native DCRs
 502          * and 'D' for MMIO DCRs.
 503          */
 504         reg = of_get_property(node, "dcr-reg", NULL);
 505         if (reg) {
 506 #ifdef CONFIG_PPC_DCR_NATIVE
 507                 dev_set_name(dev, "d%x.%s", *reg, node->name);
 508 #else /* CONFIG_PPC_DCR_NATIVE */
 509                 u64 addr = of_translate_dcr_address(node, *reg, NULL);
 510                 if (addr != OF_BAD_ADDR) {
 511                         dev_set_name(dev, "D%llx.%s",
 512                                      (unsigned long long)addr, node->name);
 513                         return;
 514                 }
 515 #endif /* !CONFIG_PPC_DCR_NATIVE */
 516         }
 517 #endif /* CONFIG_PPC_DCR */
 518
 519         /*
 520          * For MMIO, get the physical address
 521          */
 522         reg = of_get_property(node, "reg", NULL);
 523         if (reg) {
 524                 addr = of_translate_address(node, reg);
 525                 if (addr != OF_BAD_ADDR) {
 526                         dev_set_name(dev, "%llx.%s",
 527                                      (unsigned long long)addr, node->name);
 528                         return;
 529                 }
 530         }
 531
 532         /*
 533          * No BusID, use the node name and add a globally incremented
 534          * counter (and pray...)
 535          */
 536         magic = atomic_add_return(1, &bus_no_reg_magic);
 537         dev_set_name(dev, "%s.%d", node->name, magic - 1);
 538 }
 539
 540 /**
 541  * of_device_alloc - Allocate and initialize an of_device
 542  * @np: device node to assign to device
 543  * @bus_id: Name to assign to the device.  May be null to use default name.
 544  * @parent: Parent device.
 545  */
 546 struct of_device *of_device_alloc(struct device_node *np,
 547                                   const char *bus_id,
 548                                   struct device *parent)
 549 {
 550         struct of_device *dev;
 551         int rc, i, num_reg = 0, num_irq = 0;
 552         struct resource *res, temp_res;
 553
 554         /* First count how many resources are needed */
 555         while (of_address_to_resource(np, num_reg, &temp_res) == 0)
 556                 num_reg++;
 557         while (of_irq_to_resource(np, num_irq, &temp_res) != NO_IRQ)
 558                 num_irq++;
 559
 560         /* Allocate memory for both the struct device and the resource table */
 561         dev = kzalloc(sizeof(*dev) + (sizeof(*res) * (num_reg + num_irq)),
 562                       GFP_KERNEL);
 563         if (!dev)
 564                 return NULL;
 565         res = (struct resource *) &dev[1];
 566
 567         /* Populate the resource table */
 568         if (num_irq || num_reg) {
 569                 dev->num_resources = num_reg + num_irq;
 570                 dev->resource = res;
 571                 for (i = 0; i < num_reg; i++, res++) {
 572                         rc = of_address_to_resource(np, i, res);
 573                         WARN_ON(rc);
 574                 }
 575                 for (i = 0; i < num_irq; i++, res++) {
 576                         rc = of_irq_to_resource(np, i, res);
 577                         WARN_ON(rc == NO_IRQ);
 578                 }
 579         }
 580
 581         dev->dev.of_node = of_node_get(np);
 582 #if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
 583         dev->dev.dma_mask = &dev->archdata.dma_mask;
 584 #endif
 585         dev->dev.parent = parent;
 586         dev->dev.release = of_release_dev;
 587
 588         if (bus_id)
 589                 dev_set_name(&dev->dev, "%s", bus_id);
 590         else
 591                 of_device_make_bus_id(&dev->dev);
 592
 593         return dev;
 594 }
 595 EXPORT_SYMBOL(of_device_alloc);
 596
 597 /**
 598  * of_platform_device_create - Alloc, initialize and register an of_device
 599  * @np: pointer to node to create device for
 600  * @bus_id: name to assign device
 601  * @parent: Linux device model parent device.
 602  */
 603 struct of_device *of_platform_device_create(struct device_node *np,
 604                                             const char *bus_id,
 605                                             struct device *parent)
 606 {
 607         struct of_device *dev;
 608
 609         dev = of_device_alloc(np, bus_id, parent);
 610         if (!dev)
 611                 return NULL;
 612
 613 #if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
 614         dev->archdata.dma_mask = 0xffffffffUL;
 615 #endif
 616         dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 617         dev->dev.bus = &platform_bus_type;
 618
 619         /* We do not fill the DMA ops for platform devices by default.
 620          * This is currently the responsibility of the platform code
 621          * to do such, possibly using a device notifier
 622          */
 623
 624         if (of_device_register(dev) != 0) {
 625                 of_device_free(dev);
 626                 return NULL;
 627         }
 628
 629         return dev;
 630 }
 631 EXPORT_SYMBOL(of_platform_device_create);
 632
 633 /**
 634  * of_platform_bus_create - Create an OF device for a bus node and all its
 635  * children. Optionally recursively instantiate matching busses.
 636  * @bus: device node of the bus to instantiate
 637  * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
 638  * disallow recursive creation of child busses
 639  */
 640 static int of_platform_bus_create(const struct device_node *bus,
 641                                   const struct of_device_id *matches,
 642                                   struct device *parent)
 643 {
 644         struct device_node *child;
 645         struct of_device *dev;
 646         int rc = 0;
 647
 648         for_each_child_of_node(bus, child) {
 649                 pr_debug("   create child: %s\n", child->full_name);
 650                 dev = of_platform_device_create(child, NULL, parent);
 651                 if (dev == NULL)
 652                         rc = -ENOMEM;
 653                 else if (!of_match_node(matches, child))
 654                         continue;
 655                 if (rc == 0) {
 656                         pr_debug("   and sub busses\n");
 657                         rc = of_platform_bus_create(child, matches, &dev->dev);
 658                 }
 659                 if (rc) {
 660                         of_node_put(child);
 661                         break;
 662                 }
 663         }
 664         return rc;
 665 }
 666
 667 /**
 668  * of_platform_bus_probe - Probe the device-tree for platform busses
 669  * @root: parent of the first level to probe or NULL for the root of the tree
 670  * @matches: match table, NULL to use the default
 671  * @parent: parent to hook devices from, NULL for toplevel
 672  *
 673  * Note that children of the provided root are not instantiated as devices
 674  * unless the specified root itself matches the bus list and is not NULL.
 675  */
 676 int of_platform_bus_probe(struct device_node *root,
 677                           const struct of_device_id *matches,
 678                           struct device *parent)
 679 {
 680         struct device_node *child;
 681         struct of_device *dev;
 682         int rc = 0;
 683
 684         if (matches == NULL)
 685                 matches = of_default_bus_ids;
 686         if (matches == OF_NO_DEEP_PROBE)
 687                 return -EINVAL;
 688         if (root == NULL)
 689                 root = of_find_node_by_path("/");
 690         else
 691                 of_node_get(root);
 692         if (root == NULL)
 693                 return -EINVAL;
 694
 695         pr_debug("of_platform_bus_probe()\n");
 696         pr_debug(" starting at: %s\n", root->full_name);
 697
 698         /* Do a self check of bus type, if there's a match, create
 699          * children
 700          */
 701         if (of_match_node(matches, root)) {
 702                 pr_debug(" root match, create all sub devices\n");
 703                 dev = of_platform_device_create(root, NULL, parent);
 704                 if (dev == NULL) {
 705                         rc = -ENOMEM;
 706                         goto bail;
 707                 }
 708                 pr_debug(" create all sub busses\n");
 709                 rc = of_platform_bus_create(root, matches, &dev->dev);
 710                 goto bail;
 711         }
 712         for_each_child_of_node(root, child) {
 713                 if (!of_match_node(matches, child))
 714                         continue;
 715
 716                 pr_debug("  match: %s\n", child->full_name);
 717                 dev = of_platform_device_create(child, NULL, parent);
 718                 if (dev == NULL)
 719                         rc = -ENOMEM;
 720                 else
 721                         rc = of_platform_bus_create(child, matches, &dev->dev);
 722                 if (rc) {
 723                         of_node_put(child);
 724                         break;
 725                 }
 726         }
 727  bail:
 728         of_node_put(root);
 729         return rc;
 730 }
 731 EXPORT_SYMBOL(of_platform_bus_probe);
 732 #endif /* !CONFIG_SPARC */