Loading...
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 if (!of_device_is_available(np) ||
170 of_node_test_and_set_flag(np, OF_POPULATED))
171 return NULL;
172
173 dev = of_device_alloc(np, bus_id, parent);
174 if (!dev)
175 goto err_clear_flag;
176
177 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
178 if (!dev->dev.dma_mask)
179 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
180 dev->dev.bus = &platform_bus_type;
181 dev->dev.platform_data = platform_data;
182 of_msi_configure(&dev->dev, dev->dev.of_node);
183
184 if (of_device_add(dev) != 0) {
185 platform_device_put(dev);
186 goto err_clear_flag;
187 }
188
189 return dev;
190
191err_clear_flag:
192 of_node_clear_flag(np, OF_POPULATED);
193 return NULL;
194}
195
196/**
197 * of_platform_device_create - Alloc, initialize and register an of_device
198 * @np: pointer to node to create device for
199 * @bus_id: name to assign device
200 * @parent: Linux device model parent device.
201 *
202 * Return: Pointer to created platform device, or NULL if a device was not
203 * registered. Unavailable devices will not get registered.
204 */
205struct platform_device *of_platform_device_create(struct device_node *np,
206 const char *bus_id,
207 struct device *parent)
208{
209 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
210}
211EXPORT_SYMBOL(of_platform_device_create);
212
213#ifdef CONFIG_ARM_AMBA
214static struct amba_device *of_amba_device_create(struct device_node *node,
215 const char *bus_id,
216 void *platform_data,
217 struct device *parent)
218{
219 struct amba_device *dev;
220 int ret;
221
222 pr_debug("Creating amba device %pOF\n", node);
223
224 if (!of_device_is_available(node) ||
225 of_node_test_and_set_flag(node, OF_POPULATED))
226 return NULL;
227
228 dev = amba_device_alloc(NULL, 0, 0);
229 if (!dev)
230 goto err_clear_flag;
231
232 /* AMBA devices only support a single DMA mask */
233 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
234 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
235
236 /* setup generic device info */
237 device_set_node(&dev->dev, of_fwnode_handle(node));
238 dev->dev.parent = parent ? : &platform_bus;
239 dev->dev.platform_data = platform_data;
240 if (bus_id)
241 dev_set_name(&dev->dev, "%s", bus_id);
242 else
243 of_device_make_bus_id(&dev->dev);
244
245 /* Allow the HW Peripheral ID to be overridden */
246 of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid);
247
248 ret = of_address_to_resource(node, 0, &dev->res);
249 if (ret) {
250 pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n",
251 ret, node);
252 goto err_free;
253 }
254
255 ret = amba_device_add(dev, &iomem_resource);
256 if (ret) {
257 pr_err("amba_device_add() failed (%d) for %pOF\n",
258 ret, node);
259 goto err_free;
260 }
261
262 return dev;
263
264err_free:
265 amba_device_put(dev);
266err_clear_flag:
267 of_node_clear_flag(node, OF_POPULATED);
268 return NULL;
269}
270#else /* CONFIG_ARM_AMBA */
271static struct amba_device *of_amba_device_create(struct device_node *node,
272 const char *bus_id,
273 void *platform_data,
274 struct device *parent)
275{
276 return NULL;
277}
278#endif /* CONFIG_ARM_AMBA */
279
280/*
281 * of_dev_lookup() - Given a device node, lookup the preferred Linux name
282 */
283static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
284 struct device_node *np)
285{
286 const struct of_dev_auxdata *auxdata;
287 struct resource res;
288 int compatible = 0;
289
290 if (!lookup)
291 return NULL;
292
293 auxdata = lookup;
294 for (; auxdata->compatible; auxdata++) {
295 if (!of_device_is_compatible(np, auxdata->compatible))
296 continue;
297 compatible++;
298 if (!of_address_to_resource(np, 0, &res))
299 if (res.start != auxdata->phys_addr)
300 continue;
301 pr_debug("%pOF: devname=%s\n", np, auxdata->name);
302 return auxdata;
303 }
304
305 if (!compatible)
306 return NULL;
307
308 /* Try compatible match if no phys_addr and name are specified */
309 auxdata = lookup;
310 for (; auxdata->compatible; auxdata++) {
311 if (!of_device_is_compatible(np, auxdata->compatible))
312 continue;
313 if (!auxdata->phys_addr && !auxdata->name) {
314 pr_debug("%pOF: compatible match\n", np);
315 return auxdata;
316 }
317 }
318
319 return NULL;
320}
321
322/**
323 * of_platform_bus_create() - Create a device for a node and its children.
324 * @bus: device node of the bus to instantiate
325 * @matches: match table for bus nodes
326 * @lookup: auxdata table for matching id and platform_data with device nodes
327 * @parent: parent for new device, or NULL for top level.
328 * @strict: require compatible property
329 *
330 * Creates a platform_device for the provided device_node, and optionally
331 * recursively create devices for all the child nodes.
332 */
333static int of_platform_bus_create(struct device_node *bus,
334 const struct of_device_id *matches,
335 const struct of_dev_auxdata *lookup,
336 struct device *parent, bool strict)
337{
338 const struct of_dev_auxdata *auxdata;
339 struct device_node *child;
340 struct platform_device *dev;
341 const char *bus_id = NULL;
342 void *platform_data = NULL;
343 int rc = 0;
344
345 /* Make sure it has a compatible property */
346 if (strict && (!of_get_property(bus, "compatible", NULL))) {
347 pr_debug("%s() - skipping %pOF, no compatible prop\n",
348 __func__, bus);
349 return 0;
350 }
351
352 /* Skip nodes for which we don't want to create devices */
353 if (unlikely(of_match_node(of_skipped_node_table, bus))) {
354 pr_debug("%s() - skipping %pOF node\n", __func__, bus);
355 return 0;
356 }
357
358 if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
359 pr_debug("%s() - skipping %pOF, already populated\n",
360 __func__, bus);
361 return 0;
362 }
363
364 auxdata = of_dev_lookup(lookup, bus);
365 if (auxdata) {
366 bus_id = auxdata->name;
367 platform_data = auxdata->platform_data;
368 }
369
370 if (of_device_is_compatible(bus, "arm,primecell")) {
371 /*
372 * Don't return an error here to keep compatibility with older
373 * device tree files.
374 */
375 of_amba_device_create(bus, bus_id, platform_data, parent);
376 return 0;
377 }
378
379 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
380 if (!dev || !of_match_node(matches, bus))
381 return 0;
382
383 for_each_child_of_node(bus, child) {
384 pr_debug(" create child: %pOF\n", child);
385 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
386 if (rc) {
387 of_node_put(child);
388 break;
389 }
390 }
391 of_node_set_flag(bus, OF_POPULATED_BUS);
392 return rc;
393}
394
395/**
396 * of_platform_bus_probe() - Probe the device-tree for platform buses
397 * @root: parent of the first level to probe or NULL for the root of the tree
398 * @matches: match table for bus nodes
399 * @parent: parent to hook devices from, NULL for toplevel
400 *
401 * Note that children of the provided root are not instantiated as devices
402 * unless the specified root itself matches the bus list and is not NULL.
403 */
404int of_platform_bus_probe(struct device_node *root,
405 const struct of_device_id *matches,
406 struct device *parent)
407{
408 struct device_node *child;
409 int rc = 0;
410
411 root = root ? of_node_get(root) : of_find_node_by_path("/");
412 if (!root)
413 return -EINVAL;
414
415 pr_debug("%s()\n", __func__);
416 pr_debug(" starting at: %pOF\n", root);
417
418 /* Do a self check of bus type, if there's a match, create children */
419 if (of_match_node(matches, root)) {
420 rc = of_platform_bus_create(root, matches, NULL, parent, false);
421 } else for_each_child_of_node(root, child) {
422 if (!of_match_node(matches, child))
423 continue;
424 rc = of_platform_bus_create(child, matches, NULL, parent, false);
425 if (rc) {
426 of_node_put(child);
427 break;
428 }
429 }
430
431 of_node_put(root);
432 return rc;
433}
434EXPORT_SYMBOL(of_platform_bus_probe);
435
436/**
437 * of_platform_populate() - Populate platform_devices from device tree data
438 * @root: parent of the first level to probe or NULL for the root of the tree
439 * @matches: match table, NULL to use the default
440 * @lookup: auxdata table for matching id and platform_data with device nodes
441 * @parent: parent to hook devices from, NULL for toplevel
442 *
443 * Similar to of_platform_bus_probe(), this function walks the device tree
444 * and creates devices from nodes. It differs in that it follows the modern
445 * convention of requiring all device nodes to have a 'compatible' property,
446 * and it is suitable for creating devices which are children of the root
447 * node (of_platform_bus_probe will only create children of the root which
448 * are selected by the @matches argument).
449 *
450 * New board support should be using this function instead of
451 * of_platform_bus_probe().
452 *
453 * Return: 0 on success, < 0 on failure.
454 */
455int of_platform_populate(struct device_node *root,
456 const struct of_device_id *matches,
457 const struct of_dev_auxdata *lookup,
458 struct device *parent)
459{
460 struct device_node *child;
461 int rc = 0;
462
463 root = root ? of_node_get(root) : of_find_node_by_path("/");
464 if (!root)
465 return -EINVAL;
466
467 pr_debug("%s()\n", __func__);
468 pr_debug(" starting at: %pOF\n", root);
469
470 device_links_supplier_sync_state_pause();
471 for_each_child_of_node(root, child) {
472 rc = of_platform_bus_create(child, matches, lookup, parent, true);
473 if (rc) {
474 of_node_put(child);
475 break;
476 }
477 }
478 device_links_supplier_sync_state_resume();
479
480 of_node_set_flag(root, OF_POPULATED_BUS);
481
482 of_node_put(root);
483 return rc;
484}
485EXPORT_SYMBOL_GPL(of_platform_populate);
486
487int of_platform_default_populate(struct device_node *root,
488 const struct of_dev_auxdata *lookup,
489 struct device *parent)
490{
491 return of_platform_populate(root, of_default_bus_match_table, lookup,
492 parent);
493}
494EXPORT_SYMBOL_GPL(of_platform_default_populate);
495
496static const struct of_device_id reserved_mem_matches[] = {
497 { .compatible = "phram" },
498 { .compatible = "qcom,rmtfs-mem" },
499 { .compatible = "qcom,cmd-db" },
500 { .compatible = "qcom,smem" },
501 { .compatible = "ramoops" },
502 { .compatible = "nvmem-rmem" },
503 { .compatible = "google,open-dice" },
504 {}
505};
506
507static int __init of_platform_default_populate_init(void)
508{
509 struct device_node *node;
510
511 device_links_supplier_sync_state_pause();
512
513 if (!of_have_populated_dt())
514 return -ENODEV;
515
516 if (IS_ENABLED(CONFIG_PPC)) {
517 struct device_node *boot_display = NULL;
518 struct platform_device *dev;
519 int display_number = 0;
520 int ret;
521
522 /* Check if we have a MacOS display without a node spec */
523 if (of_property_present(of_chosen, "linux,bootx-noscreen")) {
524 /*
525 * The old code tried to work out which node was the MacOS
526 * display based on the address. I'm dropping that since the
527 * lack of a node spec only happens with old BootX versions
528 * (users can update) and with this code, they'll still get
529 * a display (just not the palette hacks).
530 */
531 dev = platform_device_alloc("bootx-noscreen", 0);
532 if (WARN_ON(!dev))
533 return -ENOMEM;
534 ret = platform_device_add(dev);
535 if (WARN_ON(ret)) {
536 platform_device_put(dev);
537 return ret;
538 }
539 }
540
541 /*
542 * For OF framebuffers, first create the device for the boot display,
543 * then for the other framebuffers. Only fail for the boot display;
544 * ignore errors for the rest.
545 */
546 for_each_node_by_type(node, "display") {
547 if (!of_get_property(node, "linux,opened", NULL) ||
548 !of_get_property(node, "linux,boot-display", NULL))
549 continue;
550 dev = of_platform_device_create(node, "of-display", NULL);
551 of_node_put(node);
552 if (WARN_ON(!dev))
553 return -ENOMEM;
554 boot_display = node;
555 display_number++;
556 break;
557 }
558 for_each_node_by_type(node, "display") {
559 char buf[14];
560 const char *of_display_format = "of-display.%d";
561
562 if (!of_get_property(node, "linux,opened", NULL) || node == boot_display)
563 continue;
564 ret = snprintf(buf, sizeof(buf), of_display_format, display_number++);
565 if (ret < sizeof(buf))
566 of_platform_device_create(node, buf, NULL);
567 }
568
569 } else {
570 /*
571 * Handle certain compatibles explicitly, since we don't want to create
572 * platform_devices for every node in /reserved-memory with a
573 * "compatible",
574 */
575 for_each_matching_node(node, reserved_mem_matches)
576 of_platform_device_create(node, NULL, NULL);
577
578 node = of_find_node_by_path("/firmware");
579 if (node) {
580 of_platform_populate(node, NULL, NULL, NULL);
581 of_node_put(node);
582 }
583
584 node = of_get_compatible_child(of_chosen, "simple-framebuffer");
585 if (node) {
586 /*
587 * Since a "simple-framebuffer" device is already added
588 * here, disable the Generic System Framebuffers (sysfb)
589 * to prevent it from registering another device for the
590 * system framebuffer later (e.g: using the screen_info
591 * data that may had been filled as well).
592 *
593 * This can happen for example on DT systems that do EFI
594 * booting and may provide a GOP handle to the EFI stub.
595 */
596 sysfb_disable();
597 of_platform_device_create(node, NULL, NULL);
598 of_node_put(node);
599 }
600
601 /* Populate everything else. */
602 of_platform_default_populate(NULL, NULL, NULL);
603 }
604
605 return 0;
606}
607arch_initcall_sync(of_platform_default_populate_init);
608
609static int __init of_platform_sync_state_init(void)
610{
611 device_links_supplier_sync_state_resume();
612 return 0;
613}
614late_initcall_sync(of_platform_sync_state_init);
615
616int of_platform_device_destroy(struct device *dev, void *data)
617{
618 /* Do not touch devices not populated from the device tree */
619 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
620 return 0;
621
622 /* Recurse for any nodes that were treated as busses */
623 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
624 device_for_each_child(dev, NULL, of_platform_device_destroy);
625
626 of_node_clear_flag(dev->of_node, OF_POPULATED);
627 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
628
629 if (dev->bus == &platform_bus_type)
630 platform_device_unregister(to_platform_device(dev));
631#ifdef CONFIG_ARM_AMBA
632 else if (dev->bus == &amba_bustype)
633 amba_device_unregister(to_amba_device(dev));
634#endif
635
636 return 0;
637}
638EXPORT_SYMBOL_GPL(of_platform_device_destroy);
639
640/**
641 * of_platform_depopulate() - Remove devices populated from device tree
642 * @parent: device which children will be removed
643 *
644 * Complementary to of_platform_populate(), this function removes children
645 * of the given device (and, recursively, their children) that have been
646 * created from their respective device tree nodes (and only those,
647 * leaving others - eg. manually created - unharmed).
648 */
649void of_platform_depopulate(struct device *parent)
650{
651 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
652 device_for_each_child_reverse(parent, NULL, of_platform_device_destroy);
653 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
654 }
655}
656EXPORT_SYMBOL_GPL(of_platform_depopulate);
657
658static void devm_of_platform_populate_release(struct device *dev, void *res)
659{
660 of_platform_depopulate(*(struct device **)res);
661}
662
663/**
664 * devm_of_platform_populate() - Populate platform_devices from device tree data
665 * @dev: device that requested to populate from device tree data
666 *
667 * Similar to of_platform_populate(), but will automatically call
668 * of_platform_depopulate() when the device is unbound from the bus.
669 *
670 * Return: 0 on success, < 0 on failure.
671 */
672int devm_of_platform_populate(struct device *dev)
673{
674 struct device **ptr;
675 int ret;
676
677 if (!dev)
678 return -EINVAL;
679
680 ptr = devres_alloc(devm_of_platform_populate_release,
681 sizeof(*ptr), GFP_KERNEL);
682 if (!ptr)
683 return -ENOMEM;
684
685 ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
686 if (ret) {
687 devres_free(ptr);
688 } else {
689 *ptr = dev;
690 devres_add(dev, ptr);
691 }
692
693 return ret;
694}
695EXPORT_SYMBOL_GPL(devm_of_platform_populate);
696
697static int devm_of_platform_match(struct device *dev, void *res, void *data)
698{
699 struct device **ptr = res;
700
701 if (!ptr) {
702 WARN_ON(!ptr);
703 return 0;
704 }
705
706 return *ptr == data;
707}
708
709/**
710 * devm_of_platform_depopulate() - Remove devices populated from device tree
711 * @dev: device that requested to depopulate from device tree data
712 *
713 * Complementary to devm_of_platform_populate(), this function removes children
714 * of the given device (and, recursively, their children) that have been
715 * created from their respective device tree nodes (and only those,
716 * leaving others - eg. manually created - unharmed).
717 */
718void devm_of_platform_depopulate(struct device *dev)
719{
720 int ret;
721
722 ret = devres_release(dev, devm_of_platform_populate_release,
723 devm_of_platform_match, dev);
724
725 WARN_ON(ret);
726}
727EXPORT_SYMBOL_GPL(devm_of_platform_depopulate);
728
729#ifdef CONFIG_OF_DYNAMIC
730static int of_platform_notify(struct notifier_block *nb,
731 unsigned long action, void *arg)
732{
733 struct of_reconfig_data *rd = arg;
734 struct platform_device *pdev_parent, *pdev;
735 bool children_left;
736
737 switch (of_reconfig_get_state_change(action, rd)) {
738 case OF_RECONFIG_CHANGE_ADD:
739 /* verify that the parent is a bus */
740 if (!of_node_check_flag(rd->dn->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 /*
748 * Clear the flag before adding the device so that fw_devlink
749 * doesn't skip adding consumers to this device.
750 */
751 rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE;
752 /* pdev_parent may be NULL when no bus platform device */
753 pdev_parent = of_find_device_by_node(rd->dn->parent);
754 pdev = of_platform_device_create(rd->dn, NULL,
755 pdev_parent ? &pdev_parent->dev : NULL);
756 platform_device_put(pdev_parent);
757
758 if (pdev == NULL) {
759 pr_err("%s: failed to create for '%pOF'\n",
760 __func__, rd->dn);
761 /* of_platform_device_create tosses the error code */
762 return notifier_from_errno(-EINVAL);
763 }
764 break;
765
766 case OF_RECONFIG_CHANGE_REMOVE:
767
768 /* already depopulated? */
769 if (!of_node_check_flag(rd->dn, OF_POPULATED))
770 return NOTIFY_OK;
771
772 /* find our device by node */
773 pdev = of_find_device_by_node(rd->dn);
774 if (pdev == NULL)
775 return NOTIFY_OK; /* no? not meant for us */
776
777 /* unregister takes one ref away */
778 of_platform_device_destroy(&pdev->dev, &children_left);
779
780 /* and put the reference of the find */
781 platform_device_put(pdev);
782 break;
783 }
784
785 return NOTIFY_OK;
786}
787
788static struct notifier_block platform_of_notifier = {
789 .notifier_call = of_platform_notify,
790};
791
792void of_platform_register_reconfig_notifier(void)
793{
794 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
795}
796#endif /* CONFIG_OF_DYNAMIC */
797
798#endif /* CONFIG_OF_ADDRESS */
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
24const struct of_device_id of_default_bus_match_table[] = {
25 { .compatible = "simple-bus", },
26 { .compatible = "simple-mfd", },
27 { .compatible = "isa", },
28#ifdef CONFIG_ARM_AMBA
29 { .compatible = "arm,amba-bus", },
30#endif /* CONFIG_ARM_AMBA */
31 {} /* Empty terminated list */
32};
33
34static const struct of_device_id of_skipped_node_table[] = {
35 { .compatible = "operating-points-v2", },
36 {} /* Empty terminated list */
37};
38
39/**
40 * of_find_device_by_node - Find the platform_device associated with a node
41 * @np: Pointer to device tree node
42 *
43 * Takes a reference to the embedded struct device which needs to be dropped
44 * after use.
45 *
46 * Return: platform_device pointer, or NULL if not found
47 */
48struct platform_device *of_find_device_by_node(struct device_node *np)
49{
50 struct device *dev;
51
52 dev = bus_find_device_by_of_node(&platform_bus_type, np);
53 return dev ? to_platform_device(dev) : NULL;
54}
55EXPORT_SYMBOL(of_find_device_by_node);
56
57#ifdef CONFIG_OF_ADDRESS
58/*
59 * The following routines scan a subtree and registers a device for
60 * each applicable node.
61 *
62 * Note: sparc doesn't use these routines because it has a different
63 * mechanism for creating devices from device tree nodes.
64 */
65
66/**
67 * of_device_make_bus_id - Use the device node data to assign a unique name
68 * @dev: pointer to device structure that is linked to a device tree node
69 *
70 * This routine will first try using the translated bus address to
71 * derive a unique name. If it cannot, then it will prepend names from
72 * parent nodes until a unique name can be derived.
73 */
74static void of_device_make_bus_id(struct device *dev)
75{
76 struct device_node *node = dev->of_node;
77 const __be32 *reg;
78 u64 addr;
79
80 /* Construct the name, using parent nodes if necessary to ensure uniqueness */
81 while (node->parent) {
82 /*
83 * If the address can be translated, then that is as much
84 * uniqueness as we need. Make it the first component and return
85 */
86 reg = of_get_property(node, "reg", NULL);
87 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
88 dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn",
89 addr, node, dev_name(dev));
90 return;
91 }
92
93 /* format arguments only used if dev_name() resolves to NULL */
94 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
95 kbasename(node->full_name), dev_name(dev));
96 node = node->parent;
97 }
98}
99
100/**
101 * of_device_alloc - Allocate and initialize an of_device
102 * @np: device node to assign to device
103 * @bus_id: Name to assign to the device. May be null to use default name.
104 * @parent: Parent device.
105 */
106struct platform_device *of_device_alloc(struct device_node *np,
107 const char *bus_id,
108 struct device *parent)
109{
110 struct platform_device *dev;
111 int rc, i, num_reg = 0, num_irq;
112 struct resource *res, temp_res;
113
114 dev = platform_device_alloc("", PLATFORM_DEVID_NONE);
115 if (!dev)
116 return NULL;
117
118 /* count the io and irq resources */
119 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
120 num_reg++;
121 num_irq = of_irq_count(np);
122
123 /* Populate the resource table */
124 if (num_irq || num_reg) {
125 res = kcalloc(num_irq + num_reg, sizeof(*res), GFP_KERNEL);
126 if (!res) {
127 platform_device_put(dev);
128 return NULL;
129 }
130
131 dev->num_resources = num_reg + num_irq;
132 dev->resource = res;
133 for (i = 0; i < num_reg; i++, res++) {
134 rc = of_address_to_resource(np, i, res);
135 WARN_ON(rc);
136 }
137 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
138 pr_debug("not all legacy IRQ resources mapped for %pOFn\n",
139 np);
140 }
141
142 dev->dev.of_node = of_node_get(np);
143 dev->dev.fwnode = &np->fwnode;
144 dev->dev.parent = parent ? : &platform_bus;
145
146 if (bus_id)
147 dev_set_name(&dev->dev, "%s", bus_id);
148 else
149 of_device_make_bus_id(&dev->dev);
150
151 return dev;
152}
153EXPORT_SYMBOL(of_device_alloc);
154
155/**
156 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
157 * @np: pointer to node to create device for
158 * @bus_id: name to assign device
159 * @platform_data: pointer to populate platform_data pointer with
160 * @parent: Linux device model parent device.
161 *
162 * Return: Pointer to created platform device, or NULL if a device was not
163 * registered. Unavailable devices will not get registered.
164 */
165static struct platform_device *of_platform_device_create_pdata(
166 struct device_node *np,
167 const char *bus_id,
168 void *platform_data,
169 struct device *parent)
170{
171 struct platform_device *dev;
172
173 if (!of_device_is_available(np) ||
174 of_node_test_and_set_flag(np, OF_POPULATED))
175 return NULL;
176
177 dev = of_device_alloc(np, bus_id, parent);
178 if (!dev)
179 goto err_clear_flag;
180
181 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
182 if (!dev->dev.dma_mask)
183 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
184 dev->dev.bus = &platform_bus_type;
185 dev->dev.platform_data = platform_data;
186 of_msi_configure(&dev->dev, dev->dev.of_node);
187
188 if (of_device_add(dev) != 0) {
189 platform_device_put(dev);
190 goto err_clear_flag;
191 }
192
193 return dev;
194
195err_clear_flag:
196 of_node_clear_flag(np, OF_POPULATED);
197 return NULL;
198}
199
200/**
201 * of_platform_device_create - Alloc, initialize and register an of_device
202 * @np: pointer to node to create device for
203 * @bus_id: name to assign device
204 * @parent: Linux device model parent device.
205 *
206 * Return: Pointer to created platform device, or NULL if a device was not
207 * registered. Unavailable devices will not get registered.
208 */
209struct platform_device *of_platform_device_create(struct device_node *np,
210 const char *bus_id,
211 struct device *parent)
212{
213 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
214}
215EXPORT_SYMBOL(of_platform_device_create);
216
217#ifdef CONFIG_ARM_AMBA
218static struct amba_device *of_amba_device_create(struct device_node *node,
219 const char *bus_id,
220 void *platform_data,
221 struct device *parent)
222{
223 struct amba_device *dev;
224 const void *prop;
225 int i, ret;
226
227 pr_debug("Creating amba device %pOF\n", node);
228
229 if (!of_device_is_available(node) ||
230 of_node_test_and_set_flag(node, OF_POPULATED))
231 return NULL;
232
233 dev = amba_device_alloc(NULL, 0, 0);
234 if (!dev)
235 goto err_clear_flag;
236
237 /* AMBA devices only support a single DMA mask */
238 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
239 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
240
241 /* setup generic device info */
242 dev->dev.of_node = of_node_get(node);
243 dev->dev.fwnode = &node->fwnode;
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
251 /* Allow the HW Peripheral ID to be overridden */
252 prop = of_get_property(node, "arm,primecell-periphid", NULL);
253 if (prop)
254 dev->periphid = of_read_ulong(prop, 1);
255
256 /* Decode the IRQs and address ranges */
257 for (i = 0; i < AMBA_NR_IRQS; i++)
258 dev->irq[i] = irq_of_parse_and_map(node, i);
259
260 ret = of_address_to_resource(node, 0, &dev->res);
261 if (ret) {
262 pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n",
263 ret, node);
264 goto err_free;
265 }
266
267 ret = amba_device_add(dev, &iomem_resource);
268 if (ret) {
269 pr_err("amba_device_add() failed (%d) for %pOF\n",
270 ret, node);
271 goto err_free;
272 }
273
274 return dev;
275
276err_free:
277 amba_device_put(dev);
278err_clear_flag:
279 of_node_clear_flag(node, OF_POPULATED);
280 return NULL;
281}
282#else /* CONFIG_ARM_AMBA */
283static struct amba_device *of_amba_device_create(struct device_node *node,
284 const char *bus_id,
285 void *platform_data,
286 struct device *parent)
287{
288 return NULL;
289}
290#endif /* CONFIG_ARM_AMBA */
291
292/*
293 * of_dev_lookup() - Given a device node, lookup the preferred Linux name
294 */
295static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
296 struct device_node *np)
297{
298 const struct of_dev_auxdata *auxdata;
299 struct resource res;
300 int compatible = 0;
301
302 if (!lookup)
303 return NULL;
304
305 auxdata = lookup;
306 for (; auxdata->compatible; auxdata++) {
307 if (!of_device_is_compatible(np, auxdata->compatible))
308 continue;
309 compatible++;
310 if (!of_address_to_resource(np, 0, &res))
311 if (res.start != auxdata->phys_addr)
312 continue;
313 pr_debug("%pOF: devname=%s\n", np, auxdata->name);
314 return auxdata;
315 }
316
317 if (!compatible)
318 return NULL;
319
320 /* Try compatible match if no phys_addr and name are specified */
321 auxdata = lookup;
322 for (; auxdata->compatible; auxdata++) {
323 if (!of_device_is_compatible(np, auxdata->compatible))
324 continue;
325 if (!auxdata->phys_addr && !auxdata->name) {
326 pr_debug("%pOF: compatible match\n", np);
327 return auxdata;
328 }
329 }
330
331 return NULL;
332}
333
334/**
335 * of_platform_bus_create() - Create a device for a node and its children.
336 * @bus: device node of the bus to instantiate
337 * @matches: match table for bus nodes
338 * @lookup: auxdata table for matching id and platform_data with device nodes
339 * @parent: parent for new device, or NULL for top level.
340 * @strict: require compatible property
341 *
342 * Creates a platform_device for the provided device_node, and optionally
343 * recursively create devices for all the child nodes.
344 */
345static int of_platform_bus_create(struct device_node *bus,
346 const struct of_device_id *matches,
347 const struct of_dev_auxdata *lookup,
348 struct device *parent, bool strict)
349{
350 const struct of_dev_auxdata *auxdata;
351 struct device_node *child;
352 struct platform_device *dev;
353 const char *bus_id = NULL;
354 void *platform_data = NULL;
355 int rc = 0;
356
357 /* Make sure it has a compatible property */
358 if (strict && (!of_get_property(bus, "compatible", NULL))) {
359 pr_debug("%s() - skipping %pOF, no compatible prop\n",
360 __func__, bus);
361 return 0;
362 }
363
364 /* Skip nodes for which we don't want to create devices */
365 if (unlikely(of_match_node(of_skipped_node_table, bus))) {
366 pr_debug("%s() - skipping %pOF node\n", __func__, bus);
367 return 0;
368 }
369
370 if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
371 pr_debug("%s() - skipping %pOF, already populated\n",
372 __func__, bus);
373 return 0;
374 }
375
376 auxdata = of_dev_lookup(lookup, bus);
377 if (auxdata) {
378 bus_id = auxdata->name;
379 platform_data = auxdata->platform_data;
380 }
381
382 if (of_device_is_compatible(bus, "arm,primecell")) {
383 /*
384 * Don't return an error here to keep compatibility with older
385 * device tree files.
386 */
387 of_amba_device_create(bus, bus_id, platform_data, parent);
388 return 0;
389 }
390
391 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
392 if (!dev || !of_match_node(matches, bus))
393 return 0;
394
395 for_each_child_of_node(bus, child) {
396 pr_debug(" create child: %pOF\n", child);
397 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
398 if (rc) {
399 of_node_put(child);
400 break;
401 }
402 }
403 of_node_set_flag(bus, OF_POPULATED_BUS);
404 return rc;
405}
406
407/**
408 * of_platform_bus_probe() - Probe the device-tree for platform buses
409 * @root: parent of the first level to probe or NULL for the root of the tree
410 * @matches: match table for bus nodes
411 * @parent: parent to hook devices from, NULL for toplevel
412 *
413 * Note that children of the provided root are not instantiated as devices
414 * unless the specified root itself matches the bus list and is not NULL.
415 */
416int of_platform_bus_probe(struct device_node *root,
417 const struct of_device_id *matches,
418 struct device *parent)
419{
420 struct device_node *child;
421 int rc = 0;
422
423 root = root ? of_node_get(root) : of_find_node_by_path("/");
424 if (!root)
425 return -EINVAL;
426
427 pr_debug("%s()\n", __func__);
428 pr_debug(" starting at: %pOF\n", root);
429
430 /* Do a self check of bus type, if there's a match, create children */
431 if (of_match_node(matches, root)) {
432 rc = of_platform_bus_create(root, matches, NULL, parent, false);
433 } else for_each_child_of_node(root, child) {
434 if (!of_match_node(matches, child))
435 continue;
436 rc = of_platform_bus_create(child, matches, NULL, parent, false);
437 if (rc) {
438 of_node_put(child);
439 break;
440 }
441 }
442
443 of_node_put(root);
444 return rc;
445}
446EXPORT_SYMBOL(of_platform_bus_probe);
447
448/**
449 * of_platform_populate() - Populate platform_devices from device tree data
450 * @root: parent of the first level to probe or NULL for the root of the tree
451 * @matches: match table, NULL to use the default
452 * @lookup: auxdata table for matching id and platform_data with device nodes
453 * @parent: parent to hook devices from, NULL for toplevel
454 *
455 * Similar to of_platform_bus_probe(), this function walks the device tree
456 * and creates devices from nodes. It differs in that it follows the modern
457 * convention of requiring all device nodes to have a 'compatible' property,
458 * and it is suitable for creating devices which are children of the root
459 * node (of_platform_bus_probe will only create children of the root which
460 * are selected by the @matches argument).
461 *
462 * New board support should be using this function instead of
463 * of_platform_bus_probe().
464 *
465 * Return: 0 on success, < 0 on failure.
466 */
467int of_platform_populate(struct device_node *root,
468 const struct of_device_id *matches,
469 const struct of_dev_auxdata *lookup,
470 struct device *parent)
471{
472 struct device_node *child;
473 int rc = 0;
474
475 root = root ? of_node_get(root) : of_find_node_by_path("/");
476 if (!root)
477 return -EINVAL;
478
479 pr_debug("%s()\n", __func__);
480 pr_debug(" starting at: %pOF\n", root);
481
482 device_links_supplier_sync_state_pause();
483 for_each_child_of_node(root, child) {
484 rc = of_platform_bus_create(child, matches, lookup, parent, true);
485 if (rc) {
486 of_node_put(child);
487 break;
488 }
489 }
490 device_links_supplier_sync_state_resume();
491
492 of_node_set_flag(root, OF_POPULATED_BUS);
493
494 of_node_put(root);
495 return rc;
496}
497EXPORT_SYMBOL_GPL(of_platform_populate);
498
499int of_platform_default_populate(struct device_node *root,
500 const struct of_dev_auxdata *lookup,
501 struct device *parent)
502{
503 return of_platform_populate(root, of_default_bus_match_table, lookup,
504 parent);
505}
506EXPORT_SYMBOL_GPL(of_platform_default_populate);
507
508#ifndef CONFIG_PPC
509static const struct of_device_id reserved_mem_matches[] = {
510 { .compatible = "qcom,rmtfs-mem" },
511 { .compatible = "qcom,cmd-db" },
512 { .compatible = "ramoops" },
513 { .compatible = "nvmem-rmem" },
514 {}
515};
516
517static int __init of_platform_default_populate_init(void)
518{
519 struct device_node *node;
520
521 device_links_supplier_sync_state_pause();
522
523 if (!of_have_populated_dt())
524 return -ENODEV;
525
526 /*
527 * Handle certain compatibles explicitly, since we don't want to create
528 * platform_devices for every node in /reserved-memory with a
529 * "compatible",
530 */
531 for_each_matching_node(node, reserved_mem_matches)
532 of_platform_device_create(node, NULL, NULL);
533
534 node = of_find_node_by_path("/firmware");
535 if (node) {
536 of_platform_populate(node, NULL, NULL, NULL);
537 of_node_put(node);
538 }
539
540 /* Populate everything else. */
541 of_platform_default_populate(NULL, NULL, NULL);
542
543 return 0;
544}
545arch_initcall_sync(of_platform_default_populate_init);
546
547static int __init of_platform_sync_state_init(void)
548{
549 device_links_supplier_sync_state_resume();
550 return 0;
551}
552late_initcall_sync(of_platform_sync_state_init);
553#endif
554
555int of_platform_device_destroy(struct device *dev, void *data)
556{
557 /* Do not touch devices not populated from the device tree */
558 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
559 return 0;
560
561 /* Recurse for any nodes that were treated as busses */
562 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
563 device_for_each_child(dev, NULL, of_platform_device_destroy);
564
565 of_node_clear_flag(dev->of_node, OF_POPULATED);
566 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
567
568 if (dev->bus == &platform_bus_type)
569 platform_device_unregister(to_platform_device(dev));
570#ifdef CONFIG_ARM_AMBA
571 else if (dev->bus == &amba_bustype)
572 amba_device_unregister(to_amba_device(dev));
573#endif
574
575 return 0;
576}
577EXPORT_SYMBOL_GPL(of_platform_device_destroy);
578
579/**
580 * of_platform_depopulate() - Remove devices populated from device tree
581 * @parent: device which children will be removed
582 *
583 * Complementary to of_platform_populate(), this function removes children
584 * of the given device (and, recurrently, their children) that have been
585 * created from their respective device tree nodes (and only those,
586 * leaving others - eg. manually created - unharmed).
587 */
588void of_platform_depopulate(struct device *parent)
589{
590 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
591 device_for_each_child_reverse(parent, NULL, of_platform_device_destroy);
592 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
593 }
594}
595EXPORT_SYMBOL_GPL(of_platform_depopulate);
596
597static void devm_of_platform_populate_release(struct device *dev, void *res)
598{
599 of_platform_depopulate(*(struct device **)res);
600}
601
602/**
603 * devm_of_platform_populate() - Populate platform_devices from device tree data
604 * @dev: device that requested to populate from device tree data
605 *
606 * Similar to of_platform_populate(), but will automatically call
607 * of_platform_depopulate() when the device is unbound from the bus.
608 *
609 * Return: 0 on success, < 0 on failure.
610 */
611int devm_of_platform_populate(struct device *dev)
612{
613 struct device **ptr;
614 int ret;
615
616 if (!dev)
617 return -EINVAL;
618
619 ptr = devres_alloc(devm_of_platform_populate_release,
620 sizeof(*ptr), GFP_KERNEL);
621 if (!ptr)
622 return -ENOMEM;
623
624 ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
625 if (ret) {
626 devres_free(ptr);
627 } else {
628 *ptr = dev;
629 devres_add(dev, ptr);
630 }
631
632 return ret;
633}
634EXPORT_SYMBOL_GPL(devm_of_platform_populate);
635
636static int devm_of_platform_match(struct device *dev, void *res, void *data)
637{
638 struct device **ptr = res;
639
640 if (!ptr) {
641 WARN_ON(!ptr);
642 return 0;
643 }
644
645 return *ptr == data;
646}
647
648/**
649 * devm_of_platform_depopulate() - Remove devices populated from device tree
650 * @dev: device that requested to depopulate from device tree data
651 *
652 * Complementary to devm_of_platform_populate(), this function removes children
653 * of the given device (and, recurrently, their children) that have been
654 * created from their respective device tree nodes (and only those,
655 * leaving others - eg. manually created - unharmed).
656 */
657void devm_of_platform_depopulate(struct device *dev)
658{
659 int ret;
660
661 ret = devres_release(dev, devm_of_platform_populate_release,
662 devm_of_platform_match, dev);
663
664 WARN_ON(ret);
665}
666EXPORT_SYMBOL_GPL(devm_of_platform_depopulate);
667
668#ifdef CONFIG_OF_DYNAMIC
669static int of_platform_notify(struct notifier_block *nb,
670 unsigned long action, void *arg)
671{
672 struct of_reconfig_data *rd = arg;
673 struct platform_device *pdev_parent, *pdev;
674 bool children_left;
675
676 switch (of_reconfig_get_state_change(action, rd)) {
677 case OF_RECONFIG_CHANGE_ADD:
678 /* verify that the parent is a bus */
679 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
680 return NOTIFY_OK; /* not for us */
681
682 /* already populated? (driver using of_populate manually) */
683 if (of_node_check_flag(rd->dn, OF_POPULATED))
684 return NOTIFY_OK;
685
686 /* pdev_parent may be NULL when no bus platform device */
687 pdev_parent = of_find_device_by_node(rd->dn->parent);
688 pdev = of_platform_device_create(rd->dn, NULL,
689 pdev_parent ? &pdev_parent->dev : NULL);
690 platform_device_put(pdev_parent);
691
692 if (pdev == NULL) {
693 pr_err("%s: failed to create for '%pOF'\n",
694 __func__, rd->dn);
695 /* of_platform_device_create tosses the error code */
696 return notifier_from_errno(-EINVAL);
697 }
698 break;
699
700 case OF_RECONFIG_CHANGE_REMOVE:
701
702 /* already depopulated? */
703 if (!of_node_check_flag(rd->dn, OF_POPULATED))
704 return NOTIFY_OK;
705
706 /* find our device by node */
707 pdev = of_find_device_by_node(rd->dn);
708 if (pdev == NULL)
709 return NOTIFY_OK; /* no? not meant for us */
710
711 /* unregister takes one ref away */
712 of_platform_device_destroy(&pdev->dev, &children_left);
713
714 /* and put the reference of the find */
715 platform_device_put(pdev);
716 break;
717 }
718
719 return NOTIFY_OK;
720}
721
722static struct notifier_block platform_of_notifier = {
723 .notifier_call = of_platform_notify,
724};
725
726void of_platform_register_reconfig_notifier(void)
727{
728 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
729}
730#endif /* CONFIG_OF_DYNAMIC */
731
732#endif /* CONFIG_OF_ADDRESS */