Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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/amba/bus.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/dma-mapping.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/of_address.h> |
| 21 | #include <linux/of_device.h> |
| 22 | #include <linux/of_irq.h> |
| 23 | #include <linux/of_platform.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | |
| 26 | const struct of_device_id of_default_bus_match_table[] = { |
| 27 | { .compatible = "simple-bus", }, |
| 28 | { .compatible = "simple-mfd", }, |
| 29 | #ifdef CONFIG_ARM_AMBA |
| 30 | { .compatible = "arm,amba-bus", }, |
| 31 | #endif /* CONFIG_ARM_AMBA */ |
| 32 | {} /* Empty terminated list */ |
| 33 | }; |
| 34 | |
| 35 | static int of_dev_node_match(struct device *dev, void *data) |
| 36 | { |
| 37 | return dev->of_node == data; |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * of_find_device_by_node - Find the platform_device associated with a node |
| 42 | * @np: Pointer to device tree node |
| 43 | * |
| 44 | * Returns platform_device pointer, or NULL if not found |
| 45 | */ |
| 46 | struct platform_device *of_find_device_by_node(struct device_node *np) |
| 47 | { |
| 48 | struct device *dev; |
| 49 | |
| 50 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); |
| 51 | return dev ? to_platform_device(dev) : NULL; |
| 52 | } |
| 53 | EXPORT_SYMBOL(of_find_device_by_node); |
| 54 | |
| 55 | #ifdef CONFIG_OF_ADDRESS |
| 56 | /* |
| 57 | * The following routines scan a subtree and registers a device for |
| 58 | * each applicable node. |
| 59 | * |
| 60 | * Note: sparc doesn't use these routines because it has a different |
| 61 | * mechanism for creating devices from device tree nodes. |
| 62 | */ |
| 63 | |
| 64 | /** |
| 65 | * of_device_make_bus_id - Use the device node data to assign a unique name |
| 66 | * @dev: pointer to device structure that is linked to a device tree node |
| 67 | * |
| 68 | * This routine will first try using the translated bus address to |
| 69 | * derive a unique name. If it cannot, then it will prepend names from |
| 70 | * parent nodes until a unique name can be derived. |
| 71 | */ |
| 72 | void of_device_make_bus_id(struct device *dev) |
| 73 | { |
| 74 | struct device_node *node = dev->of_node; |
| 75 | const __be32 *reg; |
| 76 | u64 addr; |
| 77 | |
| 78 | /* Construct the name, using parent nodes if necessary to ensure uniqueness */ |
| 79 | while (node->parent) { |
| 80 | /* |
| 81 | * If the address can be translated, then that is as much |
| 82 | * uniqueness as we need. Make it the first component and return |
| 83 | */ |
| 84 | reg = of_get_property(node, "reg", NULL); |
| 85 | if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { |
| 86 | dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s", |
| 87 | (unsigned long long)addr, node->name, |
| 88 | dev_name(dev)); |
| 89 | return; |
| 90 | } |
| 91 | |
| 92 | /* format arguments only used if dev_name() resolves to NULL */ |
| 93 | dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", |
| 94 | strrchr(node->full_name, '/') + 1, dev_name(dev)); |
| 95 | node = node->parent; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * of_device_alloc - Allocate and initialize an of_device |
| 101 | * @np: device node to assign to device |
| 102 | * @bus_id: Name to assign to the device. May be null to use default name. |
| 103 | * @parent: Parent device. |
| 104 | */ |
| 105 | struct platform_device *of_device_alloc(struct device_node *np, |
| 106 | const char *bus_id, |
| 107 | struct device *parent) |
| 108 | { |
| 109 | struct platform_device *dev; |
| 110 | int rc, i, num_reg = 0, num_irq; |
| 111 | struct resource *res, temp_res; |
| 112 | |
| 113 | dev = platform_device_alloc("", -1); |
| 114 | if (!dev) |
| 115 | return NULL; |
| 116 | |
| 117 | /* count the io and irq resources */ |
| 118 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) |
| 119 | num_reg++; |
| 120 | num_irq = of_irq_count(np); |
| 121 | |
| 122 | /* Populate the resource table */ |
| 123 | if (num_irq || num_reg) { |
| 124 | res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); |
| 125 | if (!res) { |
| 126 | platform_device_put(dev); |
| 127 | return NULL; |
| 128 | } |
| 129 | |
| 130 | dev->num_resources = num_reg + num_irq; |
| 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 | if (of_irq_to_resource_table(np, res, num_irq) != num_irq) |
| 137 | pr_debug("not all legacy IRQ resources mapped for %s\n", |
| 138 | np->name); |
| 139 | } |
| 140 | |
| 141 | dev->dev.of_node = of_node_get(np); |
| 142 | dev->dev.parent = parent ? : &platform_bus; |
| 143 | |
| 144 | if (bus_id) |
| 145 | dev_set_name(&dev->dev, "%s", bus_id); |
| 146 | else |
| 147 | of_device_make_bus_id(&dev->dev); |
| 148 | |
| 149 | return dev; |
| 150 | } |
| 151 | EXPORT_SYMBOL(of_device_alloc); |
| 152 | |
| 153 | static void of_dma_deconfigure(struct device *dev) |
| 154 | { |
| 155 | arch_teardown_dma_ops(dev); |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
| 160 | * @np: pointer to node to create device for |
| 161 | * @bus_id: name to assign device |
| 162 | * @platform_data: pointer to populate platform_data pointer with |
| 163 | * @parent: Linux device model parent device. |
| 164 | * |
| 165 | * Returns pointer to created platform device, or NULL if a device was not |
| 166 | * registered. Unavailable devices will not get registered. |
| 167 | */ |
| 168 | static struct platform_device *of_platform_device_create_pdata( |
| 169 | struct device_node *np, |
| 170 | const char *bus_id, |
| 171 | void *platform_data, |
| 172 | struct device *parent) |
| 173 | { |
| 174 | struct platform_device *dev; |
| 175 | |
| 176 | if (!of_device_is_available(np) || |
| 177 | of_node_test_and_set_flag(np, OF_POPULATED)) |
| 178 | return NULL; |
| 179 | |
| 180 | dev = of_device_alloc(np, bus_id, parent); |
| 181 | if (!dev) |
| 182 | goto err_clear_flag; |
| 183 | |
| 184 | dev->dev.bus = &platform_bus_type; |
| 185 | dev->dev.platform_data = platform_data; |
| 186 | of_dma_configure(&dev->dev, dev->dev.of_node); |
| 187 | of_msi_configure(&dev->dev, dev->dev.of_node); |
| 188 | |
| 189 | if (of_device_add(dev) != 0) { |
| 190 | of_dma_deconfigure(&dev->dev); |
| 191 | platform_device_put(dev); |
| 192 | goto err_clear_flag; |
| 193 | } |
| 194 | |
| 195 | return dev; |
| 196 | |
| 197 | err_clear_flag: |
| 198 | of_node_clear_flag(np, OF_POPULATED); |
| 199 | return NULL; |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * of_platform_device_create - Alloc, initialize and register an of_device |
| 204 | * @np: pointer to node to create device for |
| 205 | * @bus_id: name to assign device |
| 206 | * @parent: Linux device model parent device. |
| 207 | * |
| 208 | * Returns pointer to created platform device, or NULL if a device was not |
| 209 | * registered. Unavailable devices will not get registered. |
| 210 | */ |
| 211 | struct platform_device *of_platform_device_create(struct device_node *np, |
| 212 | const char *bus_id, |
| 213 | struct device *parent) |
| 214 | { |
| 215 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); |
| 216 | } |
| 217 | EXPORT_SYMBOL(of_platform_device_create); |
| 218 | |
| 219 | #ifdef CONFIG_ARM_AMBA |
| 220 | static struct amba_device *of_amba_device_create(struct device_node *node, |
| 221 | const char *bus_id, |
| 222 | void *platform_data, |
| 223 | struct device *parent) |
| 224 | { |
| 225 | struct amba_device *dev; |
| 226 | const void *prop; |
| 227 | int i, ret; |
| 228 | |
| 229 | pr_debug("Creating amba device %s\n", node->full_name); |
| 230 | |
| 231 | if (!of_device_is_available(node) || |
| 232 | of_node_test_and_set_flag(node, OF_POPULATED)) |
| 233 | return NULL; |
| 234 | |
| 235 | dev = amba_device_alloc(NULL, 0, 0); |
| 236 | if (!dev) { |
| 237 | pr_err("%s(): amba_device_alloc() failed for %s\n", |
| 238 | __func__, node->full_name); |
| 239 | goto err_clear_flag; |
| 240 | } |
| 241 | |
| 242 | /* setup generic device info */ |
| 243 | dev->dev.of_node = of_node_get(node); |
| 244 | dev->dev.parent = parent ? : &platform_bus; |
| 245 | dev->dev.platform_data = platform_data; |
| 246 | if (bus_id) |
| 247 | dev_set_name(&dev->dev, "%s", bus_id); |
| 248 | else |
| 249 | of_device_make_bus_id(&dev->dev); |
| 250 | of_dma_configure(&dev->dev, dev->dev.of_node); |
| 251 | |
| 252 | /* Allow the HW Peripheral ID to be overridden */ |
| 253 | prop = of_get_property(node, "arm,primecell-periphid", NULL); |
| 254 | if (prop) |
| 255 | dev->periphid = of_read_ulong(prop, 1); |
| 256 | |
| 257 | /* Decode the IRQs and address ranges */ |
| 258 | for (i = 0; i < AMBA_NR_IRQS; i++) |
| 259 | dev->irq[i] = irq_of_parse_and_map(node, i); |
| 260 | |
| 261 | ret = of_address_to_resource(node, 0, &dev->res); |
| 262 | if (ret) { |
| 263 | pr_err("%s(): of_address_to_resource() failed (%d) for %s\n", |
| 264 | __func__, ret, node->full_name); |
| 265 | goto err_free; |
| 266 | } |
| 267 | |
| 268 | ret = amba_device_add(dev, &iomem_resource); |
| 269 | if (ret) { |
| 270 | pr_err("%s(): amba_device_add() failed (%d) for %s\n", |
| 271 | __func__, ret, node->full_name); |
| 272 | goto err_free; |
| 273 | } |
| 274 | |
| 275 | return dev; |
| 276 | |
| 277 | err_free: |
| 278 | amba_device_put(dev); |
| 279 | err_clear_flag: |
| 280 | of_node_clear_flag(node, OF_POPULATED); |
| 281 | return NULL; |
| 282 | } |
| 283 | #else /* CONFIG_ARM_AMBA */ |
| 284 | static struct amba_device *of_amba_device_create(struct device_node *node, |
| 285 | const char *bus_id, |
| 286 | void *platform_data, |
| 287 | struct device *parent) |
| 288 | { |
| 289 | return NULL; |
| 290 | } |
| 291 | #endif /* CONFIG_ARM_AMBA */ |
| 292 | |
| 293 | /** |
| 294 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name |
| 295 | */ |
| 296 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, |
| 297 | struct device_node *np) |
| 298 | { |
| 299 | struct resource res; |
| 300 | |
| 301 | if (!lookup) |
| 302 | return NULL; |
| 303 | |
| 304 | for(; lookup->compatible != NULL; lookup++) { |
| 305 | if (!of_device_is_compatible(np, lookup->compatible)) |
| 306 | continue; |
| 307 | if (!of_address_to_resource(np, 0, &res)) |
| 308 | if (res.start != lookup->phys_addr) |
| 309 | continue; |
| 310 | pr_debug("%s: devname=%s\n", np->full_name, lookup->name); |
| 311 | return lookup; |
| 312 | } |
| 313 | |
| 314 | return NULL; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * of_platform_bus_create() - Create a device for a node and its children. |
| 319 | * @bus: device node of the bus to instantiate |
| 320 | * @matches: match table for bus nodes |
| 321 | * @lookup: auxdata table for matching id and platform_data with device nodes |
| 322 | * @parent: parent for new device, or NULL for top level. |
| 323 | * @strict: require compatible property |
| 324 | * |
| 325 | * Creates a platform_device for the provided device_node, and optionally |
| 326 | * recursively create devices for all the child nodes. |
| 327 | */ |
| 328 | static int of_platform_bus_create(struct device_node *bus, |
| 329 | const struct of_device_id *matches, |
| 330 | const struct of_dev_auxdata *lookup, |
| 331 | struct device *parent, bool strict) |
| 332 | { |
| 333 | const struct of_dev_auxdata *auxdata; |
| 334 | struct device_node *child; |
| 335 | struct platform_device *dev; |
| 336 | const char *bus_id = NULL; |
| 337 | void *platform_data = NULL; |
| 338 | int rc = 0; |
| 339 | |
| 340 | /* Make sure it has a compatible property */ |
| 341 | if (strict && (!of_get_property(bus, "compatible", NULL))) { |
| 342 | pr_debug("%s() - skipping %s, no compatible prop\n", |
| 343 | __func__, bus->full_name); |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | auxdata = of_dev_lookup(lookup, bus); |
| 348 | if (auxdata) { |
| 349 | bus_id = auxdata->name; |
| 350 | platform_data = auxdata->platform_data; |
| 351 | } |
| 352 | |
| 353 | if (of_device_is_compatible(bus, "arm,primecell")) { |
| 354 | /* |
| 355 | * Don't return an error here to keep compatibility with older |
| 356 | * device tree files. |
| 357 | */ |
| 358 | of_amba_device_create(bus, bus_id, platform_data, parent); |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
| 363 | if (!dev || !of_match_node(matches, bus)) |
| 364 | return 0; |
| 365 | |
| 366 | for_each_child_of_node(bus, child) { |
| 367 | pr_debug(" create child: %s\n", child->full_name); |
| 368 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
| 369 | if (rc) { |
| 370 | of_node_put(child); |
| 371 | break; |
| 372 | } |
| 373 | } |
| 374 | of_node_set_flag(bus, OF_POPULATED_BUS); |
| 375 | return rc; |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
| 380 | * @root: parent of the first level to probe or NULL for the root of the tree |
| 381 | * @matches: match table for bus nodes |
| 382 | * @parent: parent to hook devices from, NULL for toplevel |
| 383 | * |
| 384 | * Note that children of the provided root are not instantiated as devices |
| 385 | * unless the specified root itself matches the bus list and is not NULL. |
| 386 | */ |
| 387 | int of_platform_bus_probe(struct device_node *root, |
| 388 | const struct of_device_id *matches, |
| 389 | struct device *parent) |
| 390 | { |
| 391 | struct device_node *child; |
| 392 | int rc = 0; |
| 393 | |
| 394 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
| 395 | if (!root) |
| 396 | return -EINVAL; |
| 397 | |
| 398 | pr_debug("of_platform_bus_probe()\n"); |
| 399 | pr_debug(" starting at: %s\n", root->full_name); |
| 400 | |
| 401 | /* Do a self check of bus type, if there's a match, create children */ |
| 402 | if (of_match_node(matches, root)) { |
| 403 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
| 404 | } else for_each_child_of_node(root, child) { |
| 405 | if (!of_match_node(matches, child)) |
| 406 | continue; |
| 407 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
| 408 | if (rc) { |
| 409 | of_node_put(child); |
| 410 | break; |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | of_node_put(root); |
| 415 | return rc; |
| 416 | } |
| 417 | EXPORT_SYMBOL(of_platform_bus_probe); |
| 418 | |
| 419 | /** |
| 420 | * of_platform_populate() - Populate platform_devices from device tree data |
| 421 | * @root: parent of the first level to probe or NULL for the root of the tree |
| 422 | * @matches: match table, NULL to use the default |
| 423 | * @lookup: auxdata table for matching id and platform_data with device nodes |
| 424 | * @parent: parent to hook devices from, NULL for toplevel |
| 425 | * |
| 426 | * Similar to of_platform_bus_probe(), this function walks the device tree |
| 427 | * and creates devices from nodes. It differs in that it follows the modern |
| 428 | * convention of requiring all device nodes to have a 'compatible' property, |
| 429 | * and it is suitable for creating devices which are children of the root |
| 430 | * node (of_platform_bus_probe will only create children of the root which |
| 431 | * are selected by the @matches argument). |
| 432 | * |
| 433 | * New board support should be using this function instead of |
| 434 | * of_platform_bus_probe(). |
| 435 | * |
| 436 | * Returns 0 on success, < 0 on failure. |
| 437 | */ |
| 438 | int of_platform_populate(struct device_node *root, |
| 439 | const struct of_device_id *matches, |
| 440 | const struct of_dev_auxdata *lookup, |
| 441 | struct device *parent) |
| 442 | { |
| 443 | struct device_node *child; |
| 444 | int rc = 0; |
| 445 | |
| 446 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
| 447 | if (!root) |
| 448 | return -EINVAL; |
| 449 | |
| 450 | for_each_child_of_node(root, child) { |
| 451 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
| 452 | if (rc) { |
| 453 | of_node_put(child); |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | of_node_set_flag(root, OF_POPULATED_BUS); |
| 458 | |
| 459 | of_node_put(root); |
| 460 | return rc; |
| 461 | } |
| 462 | EXPORT_SYMBOL_GPL(of_platform_populate); |
| 463 | |
| 464 | int of_platform_default_populate(struct device_node *root, |
| 465 | const struct of_dev_auxdata *lookup, |
| 466 | struct device *parent) |
| 467 | { |
| 468 | return of_platform_populate(root, of_default_bus_match_table, lookup, |
| 469 | parent); |
| 470 | } |
| 471 | EXPORT_SYMBOL_GPL(of_platform_default_populate); |
| 472 | |
| 473 | static int of_platform_device_destroy(struct device *dev, void *data) |
| 474 | { |
| 475 | /* Do not touch devices not populated from the device tree */ |
| 476 | if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED)) |
| 477 | return 0; |
| 478 | |
| 479 | /* Recurse for any nodes that were treated as busses */ |
| 480 | if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS)) |
| 481 | device_for_each_child(dev, NULL, of_platform_device_destroy); |
| 482 | |
| 483 | if (dev->bus == &platform_bus_type) |
| 484 | platform_device_unregister(to_platform_device(dev)); |
| 485 | #ifdef CONFIG_ARM_AMBA |
| 486 | else if (dev->bus == &amba_bustype) |
| 487 | amba_device_unregister(to_amba_device(dev)); |
| 488 | #endif |
| 489 | |
| 490 | of_dma_deconfigure(dev); |
| 491 | of_node_clear_flag(dev->of_node, OF_POPULATED); |
| 492 | of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * of_platform_depopulate() - Remove devices populated from device tree |
| 498 | * @parent: device which children will be removed |
| 499 | * |
| 500 | * Complementary to of_platform_populate(), this function removes children |
| 501 | * of the given device (and, recurrently, their children) that have been |
| 502 | * created from their respective device tree nodes (and only those, |
| 503 | * leaving others - eg. manually created - unharmed). |
| 504 | * |
| 505 | * Returns 0 when all children devices have been removed or |
| 506 | * -EBUSY when some children remained. |
| 507 | */ |
| 508 | void of_platform_depopulate(struct device *parent) |
| 509 | { |
| 510 | if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { |
| 511 | device_for_each_child(parent, NULL, of_platform_device_destroy); |
| 512 | of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); |
| 513 | } |
| 514 | } |
| 515 | EXPORT_SYMBOL_GPL(of_platform_depopulate); |
| 516 | |
| 517 | #ifdef CONFIG_OF_DYNAMIC |
| 518 | static int of_platform_notify(struct notifier_block *nb, |
| 519 | unsigned long action, void *arg) |
| 520 | { |
| 521 | struct of_reconfig_data *rd = arg; |
| 522 | struct platform_device *pdev_parent, *pdev; |
| 523 | bool children_left; |
| 524 | |
| 525 | switch (of_reconfig_get_state_change(action, rd)) { |
| 526 | case OF_RECONFIG_CHANGE_ADD: |
| 527 | /* verify that the parent is a bus */ |
| 528 | if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) |
| 529 | return NOTIFY_OK; /* not for us */ |
| 530 | |
| 531 | /* already populated? (driver using of_populate manually) */ |
| 532 | if (of_node_check_flag(rd->dn, OF_POPULATED)) |
| 533 | return NOTIFY_OK; |
| 534 | |
| 535 | /* pdev_parent may be NULL when no bus platform device */ |
| 536 | pdev_parent = of_find_device_by_node(rd->dn->parent); |
| 537 | pdev = of_platform_device_create(rd->dn, NULL, |
| 538 | pdev_parent ? &pdev_parent->dev : NULL); |
| 539 | of_dev_put(pdev_parent); |
| 540 | |
| 541 | if (pdev == NULL) { |
| 542 | pr_err("%s: failed to create for '%s'\n", |
| 543 | __func__, rd->dn->full_name); |
| 544 | /* of_platform_device_create tosses the error code */ |
| 545 | return notifier_from_errno(-EINVAL); |
| 546 | } |
| 547 | break; |
| 548 | |
| 549 | case OF_RECONFIG_CHANGE_REMOVE: |
| 550 | |
| 551 | /* already depopulated? */ |
| 552 | if (!of_node_check_flag(rd->dn, OF_POPULATED)) |
| 553 | return NOTIFY_OK; |
| 554 | |
| 555 | /* find our device by node */ |
| 556 | pdev = of_find_device_by_node(rd->dn); |
| 557 | if (pdev == NULL) |
| 558 | return NOTIFY_OK; /* no? not meant for us */ |
| 559 | |
| 560 | /* unregister takes one ref away */ |
| 561 | of_platform_device_destroy(&pdev->dev, &children_left); |
| 562 | |
| 563 | /* and put the reference of the find */ |
| 564 | of_dev_put(pdev); |
| 565 | break; |
| 566 | } |
| 567 | |
| 568 | return NOTIFY_OK; |
| 569 | } |
| 570 | |
| 571 | static struct notifier_block platform_of_notifier = { |
| 572 | .notifier_call = of_platform_notify, |
| 573 | }; |
| 574 | |
| 575 | void of_platform_register_reconfig_notifier(void) |
| 576 | { |
| 577 | WARN_ON(of_reconfig_notifier_register(&platform_of_notifier)); |
| 578 | } |
| 579 | #endif /* CONFIG_OF_DYNAMIC */ |
| 580 | |
| 581 | #endif /* CONFIG_OF_ADDRESS */ |