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