1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. 4 * <benh@kernel.crashing.org> 5 * and Arnd Bergmann, IBM Corp. 6 * Merged from powerpc/kernel/of_platform.c and 7 * sparc{,64}/kernel/of_device.c by Stephen Rothwell 8 */ 9 10#define pr_fmt(fmt) "OF: " fmt 11 12#include <linux/errno.h> 13#include <linux/module.h> 14#include <linux/amba/bus.h> 15#include <linux/device.h> 16#include <linux/dma-mapping.h> 17#include <linux/slab.h> 18#include <linux/of_address.h> 19#include <linux/of_device.h> 20#include <linux/of_irq.h> 21#include <linux/of_platform.h> 22#include <linux/platform_device.h> 23#include <linux/sysfb.h> 24 25#include "of_private.h" 26 27const struct of_device_id of_default_bus_match_table[] = { 28 { .compatible = "simple-bus", }, 29 { .compatible = "simple-mfd", }, 30 { .compatible = "isa", }, 31#ifdef CONFIG_ARM_AMBA 32 { .compatible = "arm,amba-bus", }, 33#endif /* CONFIG_ARM_AMBA */ 34 {} /* Empty terminated list */ 35}; 36 37/** 38 * of_find_device_by_node - Find the platform_device associated with a node 39 * @np: Pointer to device tree node 40 * 41 * Takes a reference to the embedded struct device which needs to be dropped 42 * after use. 43 * 44 * Return: platform_device pointer, or NULL if not found 45 */ 46struct platform_device *of_find_device_by_node(struct device_node *np) 47{ 48 struct device *dev; 49 50 dev = bus_find_device_by_of_node(&platform_bus_type, np); 51 return dev ? to_platform_device(dev) : NULL; 52} 53EXPORT_SYMBOL(of_find_device_by_node); 54 55int of_device_add(struct platform_device *ofdev) 56{ 57 BUG_ON(ofdev->dev.of_node == NULL); 58 59 /* name and id have to be set so that the platform bus doesn't get 60 * confused on matching */ 61 ofdev->name = dev_name(&ofdev->dev); 62 ofdev->id = PLATFORM_DEVID_NONE; 63 64 /* 65 * If this device has not binding numa node in devicetree, that is 66 * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this 67 * device is on the same node as the parent. 68 */ 69 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); 70 71 return device_add(&ofdev->dev); 72} 73 74int of_device_register(struct platform_device *pdev) 75{ 76 device_initialize(&pdev->dev); 77 return of_device_add(pdev); 78} 79EXPORT_SYMBOL(of_device_register); 80 81void of_device_unregister(struct platform_device *ofdev) 82{ 83 device_unregister(&ofdev->dev); 84} 85EXPORT_SYMBOL(of_device_unregister); 86 87#ifdef CONFIG_OF_ADDRESS 88static const struct of_device_id of_skipped_node_table[] = { 89 { .compatible = "operating-points-v2", }, 90 {} /* Empty terminated list */ 91}; 92 93/* 94 * The following routines scan a subtree and registers a device for 95 * each applicable node. 96 * 97 * Note: sparc doesn't use these routines because it has a different 98 * mechanism for creating devices from device tree nodes. 99 */ 100 101/** 102 * of_device_alloc - Allocate and initialize an of_device 103 * @np: device node to assign to device 104 * @bus_id: Name to assign to the device. May be null to use default name. 105 * @parent: Parent device. 106 */ 107struct platform_device *of_device_alloc(struct device_node *np, 108 const char *bus_id, 109 struct device *parent) 110{ 111 struct platform_device *dev; 112 int rc, i, num_reg = 0; 113 struct resource *res; 114 115 dev = platform_device_alloc("", PLATFORM_DEVID_NONE); 116 if (!dev) 117 return NULL; 118 119 /* count the io resources */ 120 num_reg = of_address_count(np); 121 122 /* Populate the resource table */ 123 if (num_reg) { 124 res = kcalloc(num_reg, sizeof(*res), GFP_KERNEL); 125 if (!res) { 126 platform_device_put(dev); 127 return NULL; 128 } 129 130 dev->num_resources = num_reg; 131 dev->resource = res; 132 for (i = 0; i < num_reg; i++, res++) { 133 rc = of_address_to_resource(np, i, res); 134 WARN_ON(rc); 135 } 136 } 137 138 /* setup generic device info */ 139 device_set_node(&dev->dev, of_fwnode_handle(of_node_get(np))); 140 dev->dev.parent = parent ? : &platform_bus; 141 142 if (bus_id) 143 dev_set_name(&dev->dev, "%s", bus_id); 144 else 145 of_device_make_bus_id(&dev->dev); 146 147 return dev; 148} 149EXPORT_SYMBOL(of_device_alloc); 150 151/** 152 * of_platform_device_create_pdata - Alloc, initialize and register an of_device 153 * @np: pointer to node to create device for 154 * @bus_id: name to assign device 155 * @platform_data: pointer to populate platform_data pointer with 156 * @parent: Linux device model parent device. 157 * 158 * Return: Pointer to created platform device, or NULL if a device was not 159 * registered. Unavailable devices will not get registered. 160 */ 161static struct platform_device *of_platform_device_create_pdata( 162 struct device_node *np, 163 const char *bus_id, 164 void *platform_data, 165 struct device *parent) 166{ 167 struct platform_device *dev; 168 169 pr_debug("create platform device: %pOF\n", np); 170 171 if (!of_device_is_available(np) || 172 of_node_test_and_set_flag(np, OF_POPULATED)) 173 return NULL; 174 175 dev = of_device_alloc(np, bus_id, parent); 176 if (!dev) 177 goto err_clear_flag; 178 179 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 180 if (!dev->dev.dma_mask) 181 dev->dev.dma_mask = &dev->dev.coherent_dma_mask; 182 dev->dev.bus = &platform_bus_type; 183 dev->dev.platform_data = platform_data; 184 of_msi_configure(&dev->dev, dev->dev.of_node); 185 186 if (of_device_add(dev) != 0) { 187 platform_device_put(dev); 188 goto err_clear_flag; 189 } 190 191 return dev; 192 193err_clear_flag: 194 of_node_clear_flag(np, OF_POPULATED); 195 return NULL; 196} 197 198/** 199 * of_platform_device_create - Alloc, initialize and register an of_device 200 * @np: pointer to node to create device for 201 * @bus_id: name to assign device 202 * @parent: Linux device model parent device. 203 * 204 * Return: Pointer to created platform device, or NULL if a device was not 205 * registered. Unavailable devices will not get registered. 206 */ 207struct platform_device *of_platform_device_create(struct device_node *np, 208 const char *bus_id, 209 struct device *parent) 210{ 211 return of_platform_device_create_pdata(np, bus_id, NULL, parent); 212} 213EXPORT_SYMBOL(of_platform_device_create); 214 215#ifdef CONFIG_ARM_AMBA 216static struct amba_device *of_amba_device_create(struct device_node *node, 217 const char *bus_id, 218 void *platform_data, 219 struct device *parent) 220{ 221 struct amba_device *dev; 222 int ret; 223 224 pr_debug("Creating amba device %pOF\n", node); 225 226 if (!of_device_is_available(node) || 227 of_node_test_and_set_flag(node, OF_POPULATED)) 228 return NULL; 229 230 dev = amba_device_alloc(NULL, 0, 0); 231 if (!dev) 232 goto err_clear_flag; 233 234 /* AMBA devices only support a single DMA mask */ 235 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 236 dev->dev.dma_mask = &dev->dev.coherent_dma_mask; 237 238 /* setup generic device info */ 239 device_set_node(&dev->dev, of_fwnode_handle(node)); 240 dev->dev.parent = parent ? : &platform_bus; 241 dev->dev.platform_data = platform_data; 242 if (bus_id) 243 dev_set_name(&dev->dev, "%s", bus_id); 244 else 245 of_device_make_bus_id(&dev->dev); 246 247 /* Allow the HW Peripheral ID to be overridden */ 248 of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid); 249 250 ret = of_address_to_resource(node, 0, &dev->res); 251 if (ret) { 252 pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", 253 ret, node); 254 goto err_free; 255 } 256 257 ret = amba_device_add(dev, &iomem_resource); 258 if (ret) { 259 pr_err("amba_device_add() failed (%d) for %pOF\n", 260 ret, node); 261 goto err_free; 262 } 263 264 return dev; 265 266err_free: 267 amba_device_put(dev); 268err_clear_flag: 269 of_node_clear_flag(node, OF_POPULATED); 270 return NULL; 271} 272#else /* CONFIG_ARM_AMBA */ 273static struct amba_device *of_amba_device_create(struct device_node *node, 274 const char *bus_id, 275 void *platform_data, 276 struct device *parent) 277{ 278 return NULL; 279} 280#endif /* CONFIG_ARM_AMBA */ 281 282/* 283 * of_dev_lookup() - Given a device node, lookup the preferred Linux name 284 */ 285static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, 286 struct device_node *np) 287{ 288 const struct of_dev_auxdata *auxdata; 289 struct resource res; 290 int compatible = 0; 291 292 if (!lookup) 293 return NULL; 294 295 auxdata = lookup; 296 for (; auxdata->compatible; auxdata++) { 297 if (!of_device_is_compatible(np, auxdata->compatible)) 298 continue; 299 compatible++; 300 if (!of_address_to_resource(np, 0, &res)) 301 if (res.start != auxdata->phys_addr) 302 continue; 303 pr_debug("%pOF: devname=%s\n", np, auxdata->name); 304 return auxdata; 305 } 306 307 if (!compatible) 308 return NULL; 309 310 /* Try compatible match if no phys_addr and name are specified */ 311 auxdata = lookup; 312 for (; auxdata->compatible; auxdata++) { 313 if (!of_device_is_compatible(np, auxdata->compatible)) 314 continue; 315 if (!auxdata->phys_addr && !auxdata->name) { 316 pr_debug("%pOF: compatible match\n", np); 317 return auxdata; 318 } 319 } 320 321 return NULL; 322} 323 324/** 325 * of_platform_bus_create() - Create a device for a node and its children. 326 * @bus: device node of the bus to instantiate 327 * @matches: match table for bus nodes 328 * @lookup: auxdata table for matching id and platform_data with device nodes 329 * @parent: parent for new device, or NULL for top level. 330 * @strict: require compatible property 331 * 332 * Creates a platform_device for the provided device_node, and optionally 333 * recursively create devices for all the child nodes. 334 */ 335static int of_platform_bus_create(struct device_node *bus, 336 const struct of_device_id *matches, 337 const struct of_dev_auxdata *lookup, 338 struct device *parent, bool strict) 339{ 340 const struct of_dev_auxdata *auxdata; 341 struct device_node *child; 342 struct platform_device *dev; 343 const char *bus_id = NULL; 344 void *platform_data = NULL; 345 int rc = 0; 346 347 /* Make sure it has a compatible property */ 348 if (strict && (!of_get_property(bus, "compatible", NULL))) { 349 pr_debug("%s() - skipping %pOF, no compatible prop\n", 350 __func__, bus); 351 return 0; 352 } 353 354 /* Skip nodes for which we don't want to create devices */ 355 if (unlikely(of_match_node(of_skipped_node_table, bus))) { 356 pr_debug("%s() - skipping %pOF node\n", __func__, bus); 357 return 0; 358 } 359 360 if (of_node_check_flag(bus, OF_POPULATED_BUS)) { 361 pr_debug("%s() - skipping %pOF, already populated\n", 362 __func__, bus); 363 return 0; 364 } 365 366 auxdata = of_dev_lookup(lookup, bus); 367 if (auxdata) { 368 bus_id = auxdata->name; 369 platform_data = auxdata->platform_data; 370 } 371 372 if (of_device_is_compatible(bus, "arm,primecell")) { 373 /* 374 * Don't return an error here to keep compatibility with older 375 * device tree files. 376 */ 377 of_amba_device_create(bus, bus_id, platform_data, parent); 378 return 0; 379 } 380 381 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); 382 if (!dev || !of_match_node(matches, bus)) 383 return 0; 384 385 for_each_child_of_node(bus, child) { 386 pr_debug(" create child: %pOF\n", child); 387 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); 388 if (rc) { 389 of_node_put(child); 390 break; 391 } 392 } 393 of_node_set_flag(bus, OF_POPULATED_BUS); 394 return rc; 395} 396 397/** 398 * of_platform_bus_probe() - Probe the device-tree for platform buses 399 * @root: parent of the first level to probe or NULL for the root of the tree 400 * @matches: match table for bus nodes 401 * @parent: parent to hook devices from, NULL for toplevel 402 * 403 * Note that children of the provided root are not instantiated as devices 404 * unless the specified root itself matches the bus list and is not NULL. 405 */ 406int of_platform_bus_probe(struct device_node *root, 407 const struct of_device_id *matches, 408 struct device *parent) 409{ 410 struct device_node *child; 411 int rc = 0; 412 413 root = root ? of_node_get(root) : of_find_node_by_path("/"); 414 if (!root) 415 return -EINVAL; 416 417 pr_debug("%s()\n", __func__); 418 pr_debug(" starting at: %pOF\n", root); 419 420 /* Do a self check of bus type, if there's a match, create children */ 421 if (of_match_node(matches, root)) { 422 rc = of_platform_bus_create(root, matches, NULL, parent, false); 423 } else for_each_child_of_node(root, child) { 424 if (!of_match_node(matches, child)) 425 continue; 426 rc = of_platform_bus_create(child, matches, NULL, parent, false); 427 if (rc) { 428 of_node_put(child); 429 break; 430 } 431 } 432 433 of_node_put(root); 434 return rc; 435} 436EXPORT_SYMBOL(of_platform_bus_probe); 437 438/** 439 * of_platform_populate() - Populate platform_devices from device tree data 440 * @root: parent of the first level to probe or NULL for the root of the tree 441 * @matches: match table, NULL to use the default 442 * @lookup: auxdata table for matching id and platform_data with device nodes 443 * @parent: parent to hook devices from, NULL for toplevel 444 * 445 * Similar to of_platform_bus_probe(), this function walks the device tree 446 * and creates devices from nodes. It differs in that it follows the modern 447 * convention of requiring all device nodes to have a 'compatible' property, 448 * and it is suitable for creating devices which are children of the root 449 * node (of_platform_bus_probe will only create children of the root which 450 * are selected by the @matches argument). 451 * 452 * New board support should be using this function instead of 453 * of_platform_bus_probe(). 454 * 455 * Return: 0 on success, < 0 on failure. 456 */ 457int of_platform_populate(struct device_node *root, 458 const struct of_device_id *matches, 459 const struct of_dev_auxdata *lookup, 460 struct device *parent) 461{ 462 struct device_node *child; 463 int rc = 0; 464 465 root = root ? of_node_get(root) : of_find_node_by_path("/"); 466 if (!root) 467 return -EINVAL; 468 469 pr_debug("%s()\n", __func__); 470 pr_debug(" starting at: %pOF\n", root); 471 472 device_links_supplier_sync_state_pause(); 473 for_each_child_of_node(root, child) { 474 rc = of_platform_bus_create(child, matches, lookup, parent, true); 475 if (rc) { 476 of_node_put(child); 477 break; 478 } 479 } 480 device_links_supplier_sync_state_resume(); 481 482 of_node_set_flag(root, OF_POPULATED_BUS); 483 484 of_node_put(root); 485 return rc; 486} 487EXPORT_SYMBOL_GPL(of_platform_populate); 488 489int of_platform_default_populate(struct device_node *root, 490 const struct of_dev_auxdata *lookup, 491 struct device *parent) 492{ 493 return of_platform_populate(root, of_default_bus_match_table, lookup, 494 parent); 495} 496EXPORT_SYMBOL_GPL(of_platform_default_populate); 497 498static const struct of_device_id reserved_mem_matches[] = { 499 { .compatible = "phram" }, 500 { .compatible = "qcom,rmtfs-mem" }, 501 { .compatible = "qcom,cmd-db" }, 502 { .compatible = "qcom,smem" }, 503 { .compatible = "ramoops" }, 504 { .compatible = "nvmem-rmem" }, 505 { .compatible = "google,open-dice" }, 506 {} 507}; 508 509static int __init of_platform_default_populate_init(void) 510{ 511 struct device_node *node; 512 513 device_links_supplier_sync_state_pause(); 514 515 if (IS_ENABLED(CONFIG_PPC)) { 516 struct device_node *boot_display = NULL; 517 struct platform_device *dev; 518 int display_number = 0; 519 int ret; 520 521 /* Check if we have a MacOS display without a node spec */ 522 if (of_property_present(of_chosen, "linux,bootx-noscreen")) { 523 /* 524 * The old code tried to work out which node was the MacOS 525 * display based on the address. I'm dropping that since the 526 * lack of a node spec only happens with old BootX versions 527 * (users can update) and with this code, they'll still get 528 * a display (just not the palette hacks). 529 */ 530 dev = platform_device_alloc("bootx-noscreen", 0); 531 if (WARN_ON(!dev)) 532 return -ENOMEM; 533 ret = platform_device_add(dev); 534 if (WARN_ON(ret)) { 535 platform_device_put(dev); 536 return ret; 537 } 538 } 539 540 /* 541 * For OF framebuffers, first create the device for the boot display, 542 * then for the other framebuffers. Only fail for the boot display; 543 * ignore errors for the rest. 544 */ 545 for_each_node_by_type(node, "display") { 546 if (!of_get_property(node, "linux,opened", NULL) || 547 !of_get_property(node, "linux,boot-display", NULL)) 548 continue; 549 dev = of_platform_device_create(node, "of-display", NULL); 550 of_node_put(node); 551 if (WARN_ON(!dev)) 552 return -ENOMEM; 553 boot_display = node; 554 display_number++; 555 break; 556 } 557 for_each_node_by_type(node, "display") { 558 char buf[14]; 559 const char *of_display_format = "of-display.%d"; 560 561 if (!of_get_property(node, "linux,opened", NULL) || node == boot_display) 562 continue; 563 ret = snprintf(buf, sizeof(buf), of_display_format, display_number++); 564 if (ret < sizeof(buf)) 565 of_platform_device_create(node, buf, NULL); 566 } 567 568 } else { 569 /* 570 * Handle certain compatibles explicitly, since we don't want to create 571 * platform_devices for every node in /reserved-memory with a 572 * "compatible", 573 */ 574 for_each_matching_node(node, reserved_mem_matches) 575 of_platform_device_create(node, NULL, NULL); 576 577 node = of_find_node_by_path("/firmware"); 578 if (node) { 579 of_platform_populate(node, NULL, NULL, NULL); 580 of_node_put(node); 581 } 582 583 node = of_get_compatible_child(of_chosen, "simple-framebuffer"); 584 if (node) { 585 /* 586 * Since a "simple-framebuffer" device is already added 587 * here, disable the Generic System Framebuffers (sysfb) 588 * to prevent it from registering another device for the 589 * system framebuffer later (e.g: using the screen_info 590 * data that may had been filled as well). 591 * 592 * This can happen for example on DT systems that do EFI 593 * booting and may provide a GOP handle to the EFI stub. 594 */ 595 sysfb_disable(); 596 of_platform_device_create(node, NULL, NULL); 597 of_node_put(node); 598 } 599 600 /* Populate everything else. */ 601 of_platform_default_populate(NULL, NULL, NULL); 602 } 603 604 return 0; 605} 606arch_initcall_sync(of_platform_default_populate_init); 607 608static int __init of_platform_sync_state_init(void) 609{ 610 device_links_supplier_sync_state_resume(); 611 return 0; 612} 613late_initcall_sync(of_platform_sync_state_init); 614 615int of_platform_device_destroy(struct device *dev, void *data) 616{ 617 /* Do not touch devices not populated from the device tree */ 618 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) 619 return 0; 620 621 /* Recurse for any nodes that were treated as busses */ 622 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) 623 device_for_each_child(dev, NULL, of_platform_device_destroy); 624 625 of_node_clear_flag(dev->of_node, OF_POPULATED); 626 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); 627 628 if (dev->bus == &platform_bus_type) 629 platform_device_unregister(to_platform_device(dev)); 630#ifdef CONFIG_ARM_AMBA 631 else if (dev->bus == &amba_bustype) 632 amba_device_unregister(to_amba_device(dev)); 633#endif 634 635 return 0; 636} 637EXPORT_SYMBOL_GPL(of_platform_device_destroy); 638 639/** 640 * of_platform_depopulate() - Remove devices populated from device tree 641 * @parent: device which children will be removed 642 * 643 * Complementary to of_platform_populate(), this function removes children 644 * of the given device (and, recursively, their children) that have been 645 * created from their respective device tree nodes (and only those, 646 * leaving others - eg. manually created - unharmed). 647 */ 648void of_platform_depopulate(struct device *parent) 649{ 650 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { 651 device_for_each_child_reverse(parent, NULL, of_platform_device_destroy); 652 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); 653 } 654} 655EXPORT_SYMBOL_GPL(of_platform_depopulate); 656 657static void devm_of_platform_populate_release(struct device *dev, void *res) 658{ 659 of_platform_depopulate(*(struct device **)res); 660} 661 662/** 663 * devm_of_platform_populate() - Populate platform_devices from device tree data 664 * @dev: device that requested to populate from device tree data 665 * 666 * Similar to of_platform_populate(), but will automatically call 667 * of_platform_depopulate() when the device is unbound from the bus. 668 * 669 * Return: 0 on success, < 0 on failure. 670 */ 671int devm_of_platform_populate(struct device *dev) 672{ 673 struct device **ptr; 674 int ret; 675 676 if (!dev) 677 return -EINVAL; 678 679 ptr = devres_alloc(devm_of_platform_populate_release, 680 sizeof(*ptr), GFP_KERNEL); 681 if (!ptr) 682 return -ENOMEM; 683 684 ret = of_platform_populate(dev->of_node, NULL, NULL, dev); 685 if (ret) { 686 devres_free(ptr); 687 } else { 688 *ptr = dev; 689 devres_add(dev, ptr); 690 } 691 692 return ret; 693} 694EXPORT_SYMBOL_GPL(devm_of_platform_populate); 695 696static int devm_of_platform_match(struct device *dev, void *res, void *data) 697{ 698 struct device **ptr = res; 699 700 if (!ptr) { 701 WARN_ON(!ptr); 702 return 0; 703 } 704 705 return *ptr == data; 706} 707 708/** 709 * devm_of_platform_depopulate() - Remove devices populated from device tree 710 * @dev: device that requested to depopulate from device tree data 711 * 712 * Complementary to devm_of_platform_populate(), this function removes children 713 * of the given device (and, recursively, their children) that have been 714 * created from their respective device tree nodes (and only those, 715 * leaving others - eg. manually created - unharmed). 716 */ 717void devm_of_platform_depopulate(struct device *dev) 718{ 719 int ret; 720 721 ret = devres_release(dev, devm_of_platform_populate_release, 722 devm_of_platform_match, dev); 723 724 WARN_ON(ret); 725} 726EXPORT_SYMBOL_GPL(devm_of_platform_depopulate); 727 728#ifdef CONFIG_OF_DYNAMIC 729static int of_platform_notify(struct notifier_block *nb, 730 unsigned long action, void *arg) 731{ 732 struct of_reconfig_data *rd = arg; 733 struct platform_device *pdev_parent, *pdev; 734 bool children_left; 735 736 switch (of_reconfig_get_state_change(action, rd)) { 737 case OF_RECONFIG_CHANGE_ADD: 738 /* verify that the parent is a bus */ 739 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) 740 return NOTIFY_OK; /* not for us */ 741 742 /* already populated? (driver using of_populate manually) */ 743 if (of_node_check_flag(rd->dn, OF_POPULATED)) 744 return NOTIFY_OK; 745 746 /* 747 * Clear the flag before adding the device so that fw_devlink 748 * doesn't skip adding consumers to this device. 749 */ 750 rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; 751 /* pdev_parent may be NULL when no bus platform device */ 752 pdev_parent = of_find_device_by_node(rd->dn->parent); 753 pdev = of_platform_device_create(rd->dn, NULL, 754 pdev_parent ? &pdev_parent->dev : NULL); 755 platform_device_put(pdev_parent); 756 757 if (pdev == NULL) { 758 pr_err("%s: failed to create for '%pOF'\n", 759 __func__, rd->dn); 760 /* of_platform_device_create tosses the error code */ 761 return notifier_from_errno(-EINVAL); 762 } 763 break; 764 765 case OF_RECONFIG_CHANGE_REMOVE: 766 767 /* already depopulated? */ 768 if (!of_node_check_flag(rd->dn, OF_POPULATED)) 769 return NOTIFY_OK; 770 771 /* find our device by node */ 772 pdev = of_find_device_by_node(rd->dn); 773 if (pdev == NULL) 774 return NOTIFY_OK; /* no? not meant for us */ 775 776 /* unregister takes one ref away */ 777 of_platform_device_destroy(&pdev->dev, &children_left); 778 779 /* and put the reference of the find */ 780 platform_device_put(pdev); 781 break; 782 } 783 784 return NOTIFY_OK; 785} 786 787static struct notifier_block platform_of_notifier = { 788 .notifier_call = of_platform_notify, 789}; 790 791void of_platform_register_reconfig_notifier(void) 792{ 793 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); 794} 795#endif /* CONFIG_OF_DYNAMIC */ 796 797#endif /* CONFIG_OF_ADDRESS */ 798