1 // SPDX-License-Identifier: GPL-2.0
3 * Support for dynamic device trees.
5 * On some platforms, the device tree can be manipulated at runtime.
6 * The routines in this section support adding, removing and changing
10 #define pr_fmt(fmt) "OF: " fmt
13 #include <linux/spinlock.h>
14 #include <linux/slab.h>
15 #include <linux/string.h>
16 #include <linux/proc_fs.h>
18 #include "of_private.h"
20 static struct device_node *kobj_to_device_node(struct kobject *kobj)
22 return container_of(kobj, struct device_node, kobj);
26 * of_node_get() - Increment refcount of a node
27 * @node: Node to inc refcount, NULL is supported to simplify writing of
30 * Return: The node with refcount incremented.
32 struct device_node *of_node_get(struct device_node *node)
35 kobject_get(&node->kobj);
38 EXPORT_SYMBOL(of_node_get);
41 * of_node_put() - Decrement refcount of a node
42 * @node: Node to dec refcount, NULL is supported to simplify writing of
45 void of_node_put(struct device_node *node)
48 kobject_put(&node->kobj);
50 EXPORT_SYMBOL(of_node_put);
52 static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain);
54 int of_reconfig_notifier_register(struct notifier_block *nb)
56 return blocking_notifier_chain_register(&of_reconfig_chain, nb);
58 EXPORT_SYMBOL_GPL(of_reconfig_notifier_register);
60 int of_reconfig_notifier_unregister(struct notifier_block *nb)
62 return blocking_notifier_chain_unregister(&of_reconfig_chain, nb);
64 EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);
66 static const char *action_names[] = {
68 [OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE",
69 [OF_RECONFIG_DETACH_NODE] = "DETACH_NODE",
70 [OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY",
71 [OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY",
72 [OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY",
75 #define _do_print(func, prefix, action, node, prop, ...) ({ \
76 func("changeset: " prefix "%-15s %pOF%s%s\n", \
77 ##__VA_ARGS__, action_names[action], node, \
78 prop ? ":" : "", prop ? prop->name : ""); \
80 #define of_changeset_action_err(...) _do_print(pr_err, __VA_ARGS__)
81 #define of_changeset_action_debug(...) _do_print(pr_debug, __VA_ARGS__)
83 int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)
86 struct of_reconfig_data *pr = p;
88 of_changeset_action_debug("notify: ", action, pr->dn, pr->prop);
90 rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p);
91 return notifier_to_errno(rc);
95 * of_reconfig_get_state_change() - Returns new state of device
96 * @action - action of the of notifier
97 * @arg - argument of the of notifier
99 * Returns the new state of a device based on the notifier used.
101 * Return: OF_RECONFIG_CHANGE_REMOVE on device going from enabled to
102 * disabled, OF_RECONFIG_CHANGE_ADD on device going from disabled to
103 * enabled and OF_RECONFIG_NO_CHANGE on no change.
105 int of_reconfig_get_state_change(unsigned long action, struct of_reconfig_data *pr)
107 struct property *prop, *old_prop = NULL;
108 int is_status, status_state, old_status_state, prev_state, new_state;
110 /* figure out if a device should be created or destroyed */
112 case OF_RECONFIG_ATTACH_NODE:
113 case OF_RECONFIG_DETACH_NODE:
114 prop = of_find_property(pr->dn, "status", NULL);
116 case OF_RECONFIG_ADD_PROPERTY:
117 case OF_RECONFIG_REMOVE_PROPERTY:
120 case OF_RECONFIG_UPDATE_PROPERTY:
122 old_prop = pr->old_prop;
125 return OF_RECONFIG_NO_CHANGE;
130 old_status_state = -1;
134 if (prop && !strcmp(prop->name, "status")) {
136 status_state = !strcmp(prop->value, "okay") ||
137 !strcmp(prop->value, "ok");
139 old_status_state = !strcmp(old_prop->value, "okay") ||
140 !strcmp(old_prop->value, "ok");
144 case OF_RECONFIG_ATTACH_NODE:
146 /* -1 & 0 status either missing or okay */
147 new_state = status_state != 0;
149 case OF_RECONFIG_DETACH_NODE:
150 /* -1 & 0 status either missing or okay */
151 prev_state = status_state != 0;
154 case OF_RECONFIG_ADD_PROPERTY:
156 /* no status property -> enabled (legacy) */
158 new_state = status_state;
161 case OF_RECONFIG_REMOVE_PROPERTY:
163 prev_state = status_state;
164 /* no status property -> enabled (legacy) */
168 case OF_RECONFIG_UPDATE_PROPERTY:
170 prev_state = old_status_state != 0;
171 new_state = status_state != 0;
176 if (prev_state == new_state)
177 return OF_RECONFIG_NO_CHANGE;
179 return new_state ? OF_RECONFIG_CHANGE_ADD : OF_RECONFIG_CHANGE_REMOVE;
181 EXPORT_SYMBOL_GPL(of_reconfig_get_state_change);
183 int of_property_notify(int action, struct device_node *np,
184 struct property *prop, struct property *oldprop)
186 struct of_reconfig_data pr;
188 /* only call notifiers if the node is attached */
189 if (!of_node_is_attached(np))
194 pr.old_prop = oldprop;
195 return of_reconfig_notify(action, &pr);
198 static void __of_attach_node(struct device_node *np)
200 const __be32 *phandle;
204 raw_spin_lock_irqsave(&devtree_lock, flags);
206 if (!of_node_check_flag(np, OF_OVERLAY)) {
207 np->name = __of_get_property(np, "name", NULL);
211 phandle = __of_get_property(np, "phandle", &sz);
213 phandle = __of_get_property(np, "linux,phandle", &sz);
214 if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle)
215 phandle = __of_get_property(np, "ibm,phandle", &sz);
216 if (phandle && (sz >= 4))
217 np->phandle = be32_to_cpup(phandle);
223 np->sibling = np->parent->child;
224 np->parent->child = np;
225 of_node_clear_flag(np, OF_DETACHED);
226 np->fwnode.flags |= FWNODE_FLAG_NOT_DEVICE;
228 raw_spin_unlock_irqrestore(&devtree_lock, flags);
230 __of_attach_node_sysfs(np);
234 * of_attach_node() - Plug a device node into the tree and global list.
235 * @np: Pointer to the caller's Device Node
237 int of_attach_node(struct device_node *np)
239 struct of_reconfig_data rd;
241 memset(&rd, 0, sizeof(rd));
244 mutex_lock(&of_mutex);
245 __of_attach_node(np);
246 mutex_unlock(&of_mutex);
248 of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
253 void __of_detach_node(struct device_node *np)
255 struct device_node *parent;
258 raw_spin_lock_irqsave(&devtree_lock, flags);
261 if (WARN_ON(of_node_check_flag(np, OF_DETACHED) || !parent)) {
262 raw_spin_unlock_irqrestore(&devtree_lock, flags);
266 if (parent->child == np)
267 parent->child = np->sibling;
269 struct device_node *prevsib;
270 for (prevsib = np->parent->child;
271 prevsib->sibling != np;
272 prevsib = prevsib->sibling)
274 prevsib->sibling = np->sibling;
277 of_node_set_flag(np, OF_DETACHED);
279 /* race with of_find_node_by_phandle() prevented by devtree_lock */
280 __of_phandle_cache_inv_entry(np->phandle);
282 raw_spin_unlock_irqrestore(&devtree_lock, flags);
284 __of_detach_node_sysfs(np);
288 * of_detach_node() - "Unplug" a node from the device tree.
289 * @np: Pointer to the caller's Device Node
291 int of_detach_node(struct device_node *np)
293 struct of_reconfig_data rd;
295 memset(&rd, 0, sizeof(rd));
298 mutex_lock(&of_mutex);
299 __of_detach_node(np);
300 mutex_unlock(&of_mutex);
302 of_reconfig_notify(OF_RECONFIG_DETACH_NODE, &rd);
306 EXPORT_SYMBOL_GPL(of_detach_node);
308 static void property_list_free(struct property *prop_list)
310 struct property *prop, *next;
312 for (prop = prop_list; prop != NULL; prop = next) {
321 * of_node_release() - release a dynamically allocated node
322 * @kobj: kernel object of the node to be released
324 * In of_node_put() this function is passed to kref_put() as the destructor.
326 void of_node_release(struct kobject *kobj)
328 struct device_node *node = kobj_to_device_node(kobj);
331 * can not use '"%pOF", node' in pr_err() calls from this function
332 * because an of_node_get(node) when refcount is already zero
333 * will result in an error and a stack dump
336 /* We should never be releasing nodes that haven't been detached. */
337 if (!of_node_check_flag(node, OF_DETACHED)) {
339 pr_err("ERROR: %s() detected bad of_node_put() on %pOF/%s\n",
340 __func__, node->parent, node->full_name);
343 * of unittests will test this path. Do not print the stack
344 * trace when the error is caused by unittest so that we do
345 * not display what a normal developer might reasonably
346 * consider a real bug.
348 if (!IS_ENABLED(CONFIG_OF_UNITTEST) ||
349 strcmp(node->parent->full_name, "testcase-data")) {
351 pr_err("ERROR: next of_node_put() on this node will result in a kobject warning 'refcount_t: underflow; use-after-free.'\n");
356 if (!of_node_check_flag(node, OF_DYNAMIC))
359 if (of_node_check_flag(node, OF_OVERLAY)) {
361 if (!of_node_check_flag(node, OF_OVERLAY_FREE_CSET)) {
362 /* premature refcount of zero, do not free memory */
363 pr_err("ERROR: memory leak before free overlay changeset, %pOF\n",
369 * If node->properties non-empty then properties were added
370 * to this node either by different overlay that has not
371 * yet been removed, or by a non-overlay mechanism.
373 if (node->properties)
374 pr_err("ERROR: %s(), unexpected properties in %pOF\n",
379 pr_err("ERROR: %s() unexpected children for %pOF/%s\n",
380 __func__, node->parent, node->full_name);
382 property_list_free(node->properties);
383 property_list_free(node->deadprops);
384 fwnode_links_purge(of_fwnode_handle(node));
386 kfree(node->full_name);
392 * __of_prop_dup - Copy a property dynamically.
393 * @prop: Property to copy
394 * @allocflags: Allocation flags (typically pass GFP_KERNEL)
396 * Copy a property by dynamically allocating the memory of both the
397 * property structure and the property name & contents. The property's
398 * flags have the OF_DYNAMIC bit set so that we can differentiate between
399 * dynamically allocated properties and not.
401 * Return: The newly allocated property or NULL on out of memory error.
403 struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
405 struct property *new;
407 new = kzalloc(sizeof(*new), allocflags);
412 * NOTE: There is no check for zero length value.
413 * In case of a boolean property, this will allocate a value
414 * of zero bytes. We do this to work around the use
415 * of of_get_property() calls on boolean values.
417 new->name = kstrdup(prop->name, allocflags);
418 new->value = kmemdup(prop->value, prop->length, allocflags);
419 new->length = prop->length;
420 if (!new->name || !new->value)
423 /* mark the property as dynamic */
424 of_property_set_flag(new, OF_DYNAMIC);
436 * __of_node_dup() - Duplicate or create an empty device node dynamically.
437 * @np: if not NULL, contains properties to be duplicated in new node
438 * @full_name: string value to be duplicated into new node's full_name field
440 * Create a device tree node, optionally duplicating the properties of
441 * another node. The node data are dynamically allocated and all the node
442 * flags have the OF_DYNAMIC & OF_DETACHED bits set.
444 * Return: The newly allocated node or NULL on out of memory error. Use
445 * of_node_put() on it when done to free the memory allocated for it.
447 struct device_node *__of_node_dup(const struct device_node *np,
448 const char *full_name)
450 struct device_node *node;
452 node = kzalloc(sizeof(*node), GFP_KERNEL);
455 node->full_name = kstrdup(full_name, GFP_KERNEL);
456 if (!node->full_name) {
461 of_node_set_flag(node, OF_DYNAMIC);
462 of_node_set_flag(node, OF_DETACHED);
465 /* Iterate over and duplicate all properties */
467 struct property *pp, *new_pp;
468 for_each_property_of_node(np, pp) {
469 new_pp = __of_prop_dup(pp, GFP_KERNEL);
472 if (__of_add_property(node, new_pp)) {
474 kfree(new_pp->value);
483 of_node_put(node); /* Frees the node and properties */
488 * of_changeset_create_node - Dynamically create a device node and attach to
491 * @ocs: Pointer to changeset
492 * @parent: Pointer to parent device node
493 * @full_name: Node full name
495 * Return: Pointer to the created device node or NULL in case of an error.
497 struct device_node *of_changeset_create_node(struct of_changeset *ocs,
498 struct device_node *parent,
499 const char *full_name)
501 struct device_node *np;
504 np = __of_node_dup(NULL, full_name);
509 ret = of_changeset_attach_node(ocs, np);
517 EXPORT_SYMBOL(of_changeset_create_node);
519 static void __of_changeset_entry_destroy(struct of_changeset_entry *ce)
521 if (ce->action == OF_RECONFIG_ATTACH_NODE &&
522 of_node_check_flag(ce->np, OF_OVERLAY)) {
523 if (kref_read(&ce->np->kobj.kref) > 1) {
524 pr_err("ERROR: memory leak, expected refcount 1 instead of %d, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node %pOF\n",
525 kref_read(&ce->np->kobj.kref), ce->np);
527 of_node_set_flag(ce->np, OF_OVERLAY_FREE_CSET);
536 static void __of_changeset_entry_invert(struct of_changeset_entry *ce,
537 struct of_changeset_entry *rce)
539 memcpy(rce, ce, sizeof(*rce));
541 switch (ce->action) {
542 case OF_RECONFIG_ATTACH_NODE:
543 rce->action = OF_RECONFIG_DETACH_NODE;
545 case OF_RECONFIG_DETACH_NODE:
546 rce->action = OF_RECONFIG_ATTACH_NODE;
548 case OF_RECONFIG_ADD_PROPERTY:
549 rce->action = OF_RECONFIG_REMOVE_PROPERTY;
551 case OF_RECONFIG_REMOVE_PROPERTY:
552 rce->action = OF_RECONFIG_ADD_PROPERTY;
554 case OF_RECONFIG_UPDATE_PROPERTY:
555 rce->old_prop = ce->prop;
556 rce->prop = ce->old_prop;
557 /* update was used but original property did not exist */
559 rce->action = OF_RECONFIG_REMOVE_PROPERTY;
560 rce->prop = ce->prop;
566 static int __of_changeset_entry_notify(struct of_changeset_entry *ce,
569 struct of_reconfig_data rd;
570 struct of_changeset_entry ce_inverted;
574 __of_changeset_entry_invert(ce, &ce_inverted);
578 switch (ce->action) {
579 case OF_RECONFIG_ATTACH_NODE:
580 case OF_RECONFIG_DETACH_NODE:
581 memset(&rd, 0, sizeof(rd));
583 ret = of_reconfig_notify(ce->action, &rd);
585 case OF_RECONFIG_ADD_PROPERTY:
586 case OF_RECONFIG_REMOVE_PROPERTY:
587 case OF_RECONFIG_UPDATE_PROPERTY:
588 ret = of_property_notify(ce->action, ce->np, ce->prop, ce->old_prop);
591 pr_err("invalid devicetree changeset action: %i\n",
597 pr_err("changeset notifier error @%pOF\n", ce->np);
601 static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
605 of_changeset_action_debug("apply: ", ce->action, ce->np, ce->prop);
607 switch (ce->action) {
608 case OF_RECONFIG_ATTACH_NODE:
609 __of_attach_node(ce->np);
611 case OF_RECONFIG_DETACH_NODE:
612 __of_detach_node(ce->np);
614 case OF_RECONFIG_ADD_PROPERTY:
615 ret = __of_add_property(ce->np, ce->prop);
617 case OF_RECONFIG_REMOVE_PROPERTY:
618 ret = __of_remove_property(ce->np, ce->prop);
621 case OF_RECONFIG_UPDATE_PROPERTY:
622 ret = __of_update_property(ce->np, ce->prop, &ce->old_prop);
629 of_changeset_action_err("apply failed: ", ce->action, ce->np, ce->prop);
636 static inline int __of_changeset_entry_revert(struct of_changeset_entry *ce)
638 struct of_changeset_entry ce_inverted;
640 __of_changeset_entry_invert(ce, &ce_inverted);
641 return __of_changeset_entry_apply(&ce_inverted);
645 * of_changeset_init - Initialize a changeset for use
647 * @ocs: changeset pointer
649 * Initialize a changeset structure
651 void of_changeset_init(struct of_changeset *ocs)
653 memset(ocs, 0, sizeof(*ocs));
654 INIT_LIST_HEAD(&ocs->entries);
656 EXPORT_SYMBOL_GPL(of_changeset_init);
659 * of_changeset_destroy - Destroy a changeset
661 * @ocs: changeset pointer
663 * Destroys a changeset. Note that if a changeset is applied,
664 * its changes to the tree cannot be reverted.
666 void of_changeset_destroy(struct of_changeset *ocs)
668 struct of_changeset_entry *ce, *cen;
670 list_for_each_entry_safe_reverse(ce, cen, &ocs->entries, node)
671 __of_changeset_entry_destroy(ce);
673 EXPORT_SYMBOL_GPL(of_changeset_destroy);
676 * Apply the changeset entries in @ocs.
677 * If apply fails, an attempt is made to revert the entries that were
678 * successfully applied.
680 * If multiple revert errors occur then only the final revert error is reported.
682 * Returns 0 on success, a negative error value in case of an error.
683 * If a revert error occurs, it is returned in *ret_revert.
685 int __of_changeset_apply_entries(struct of_changeset *ocs, int *ret_revert)
687 struct of_changeset_entry *ce;
690 pr_debug("changeset: applying...\n");
691 list_for_each_entry(ce, &ocs->entries, node) {
692 ret = __of_changeset_entry_apply(ce);
694 pr_err("Error applying changeset (%d)\n", ret);
695 list_for_each_entry_continue_reverse(ce, &ocs->entries,
697 ret_tmp = __of_changeset_entry_revert(ce);
699 *ret_revert = ret_tmp;
709 * Returns 0 on success, a negative error value in case of an error.
711 * If multiple changeset entry notification errors occur then only the
712 * final notification error is reported.
714 int __of_changeset_apply_notify(struct of_changeset *ocs)
716 struct of_changeset_entry *ce;
717 int ret = 0, ret_tmp;
719 pr_debug("changeset: emitting notifiers.\n");
721 /* drop the global lock while emitting notifiers */
722 mutex_unlock(&of_mutex);
723 list_for_each_entry(ce, &ocs->entries, node) {
724 ret_tmp = __of_changeset_entry_notify(ce, 0);
728 mutex_lock(&of_mutex);
729 pr_debug("changeset: notifiers sent.\n");
735 * Returns 0 on success, a negative error value in case of an error.
737 * If a changeset entry apply fails, an attempt is made to revert any
738 * previous entries in the changeset. If any of the reverts fails,
739 * that failure is not reported. Thus the state of the device tree
740 * is unknown if an apply error occurs.
742 static int __of_changeset_apply(struct of_changeset *ocs)
744 int ret, ret_revert = 0;
746 ret = __of_changeset_apply_entries(ocs, &ret_revert);
748 ret = __of_changeset_apply_notify(ocs);
754 * of_changeset_apply - Applies a changeset
756 * @ocs: changeset pointer
758 * Applies a changeset to the live tree.
759 * Any side-effects of live tree state changes are applied here on
760 * success, like creation/destruction of devices and side-effects
761 * like creation of sysfs properties and directories.
763 * Return: 0 on success, a negative error value in case of an error.
764 * On error the partially applied effects are reverted.
766 int of_changeset_apply(struct of_changeset *ocs)
770 mutex_lock(&of_mutex);
771 ret = __of_changeset_apply(ocs);
772 mutex_unlock(&of_mutex);
776 EXPORT_SYMBOL_GPL(of_changeset_apply);
779 * Revert the changeset entries in @ocs.
780 * If revert fails, an attempt is made to re-apply the entries that were
781 * successfully removed.
783 * If multiple re-apply errors occur then only the final apply error is
786 * Returns 0 on success, a negative error value in case of an error.
787 * If an apply error occurs, it is returned in *ret_apply.
789 int __of_changeset_revert_entries(struct of_changeset *ocs, int *ret_apply)
791 struct of_changeset_entry *ce;
794 pr_debug("changeset: reverting...\n");
795 list_for_each_entry_reverse(ce, &ocs->entries, node) {
796 ret = __of_changeset_entry_revert(ce);
798 pr_err("Error reverting changeset (%d)\n", ret);
799 list_for_each_entry_continue(ce, &ocs->entries, node) {
800 ret_tmp = __of_changeset_entry_apply(ce);
802 *ret_apply = ret_tmp;
812 * If multiple changeset entry notification errors occur then only the
813 * final notification error is reported.
815 int __of_changeset_revert_notify(struct of_changeset *ocs)
817 struct of_changeset_entry *ce;
818 int ret = 0, ret_tmp;
820 pr_debug("changeset: emitting notifiers.\n");
822 /* drop the global lock while emitting notifiers */
823 mutex_unlock(&of_mutex);
824 list_for_each_entry_reverse(ce, &ocs->entries, node) {
825 ret_tmp = __of_changeset_entry_notify(ce, 1);
829 mutex_lock(&of_mutex);
830 pr_debug("changeset: notifiers sent.\n");
835 static int __of_changeset_revert(struct of_changeset *ocs)
840 ret = __of_changeset_revert_entries(ocs, &ret_reply);
843 ret = __of_changeset_revert_notify(ocs);
849 * of_changeset_revert - Reverts an applied changeset
851 * @ocs: changeset pointer
853 * Reverts a changeset returning the state of the tree to what it
854 * was before the application.
855 * Any side-effects like creation/destruction of devices and
856 * removal of sysfs properties and directories are applied.
858 * Return: 0 on success, a negative error value in case of an error.
860 int of_changeset_revert(struct of_changeset *ocs)
864 mutex_lock(&of_mutex);
865 ret = __of_changeset_revert(ocs);
866 mutex_unlock(&of_mutex);
870 EXPORT_SYMBOL_GPL(of_changeset_revert);
873 * of_changeset_action - Add an action to the tail of the changeset list
875 * @ocs: changeset pointer
876 * @action: action to perform
877 * @np: Pointer to device node
878 * @prop: Pointer to property
880 * On action being one of:
881 * + OF_RECONFIG_ATTACH_NODE
882 * + OF_RECONFIG_DETACH_NODE,
883 * + OF_RECONFIG_ADD_PROPERTY
884 * + OF_RECONFIG_REMOVE_PROPERTY,
885 * + OF_RECONFIG_UPDATE_PROPERTY
887 * Return: 0 on success, a negative error value in case of an error.
889 int of_changeset_action(struct of_changeset *ocs, unsigned long action,
890 struct device_node *np, struct property *prop)
892 struct of_changeset_entry *ce;
894 if (WARN_ON(action >= ARRAY_SIZE(action_names)))
897 ce = kzalloc(sizeof(*ce), GFP_KERNEL);
901 /* get a reference to the node */
903 ce->np = of_node_get(np);
906 /* add it to the list */
907 list_add_tail(&ce->node, &ocs->entries);
910 EXPORT_SYMBOL_GPL(of_changeset_action);
912 static int of_changeset_add_prop_helper(struct of_changeset *ocs,
913 struct device_node *np,
914 const struct property *pp)
916 struct property *new_pp;
919 new_pp = __of_prop_dup(pp, GFP_KERNEL);
923 ret = of_changeset_add_property(ocs, np, new_pp);
926 kfree(new_pp->value);
934 * of_changeset_add_prop_string - Add a string property to a changeset
936 * @ocs: changeset pointer
937 * @np: device node pointer
938 * @prop_name: name of the property to be added
939 * @str: pointer to null terminated string
941 * Create a string property and add it to a changeset.
943 * Return: 0 on success, a negative error value in case of an error.
945 int of_changeset_add_prop_string(struct of_changeset *ocs,
946 struct device_node *np,
947 const char *prop_name, const char *str)
949 struct property prop;
951 prop.name = (char *)prop_name;
952 prop.length = strlen(str) + 1;
953 prop.value = (void *)str;
955 return of_changeset_add_prop_helper(ocs, np, &prop);
957 EXPORT_SYMBOL_GPL(of_changeset_add_prop_string);
960 * of_changeset_add_prop_string_array - Add a string list property to
963 * @ocs: changeset pointer
964 * @np: device node pointer
965 * @prop_name: name of the property to be added
966 * @str_array: pointer to an array of null terminated strings
967 * @sz: number of string array elements
969 * Create a string list property and add it to a changeset.
971 * Return: 0 on success, a negative error value in case of an error.
973 int of_changeset_add_prop_string_array(struct of_changeset *ocs,
974 struct device_node *np,
975 const char *prop_name,
976 const char **str_array, size_t sz)
978 struct property prop;
982 prop.name = (char *)prop_name;
985 for (i = 0; i < sz; i++)
986 prop.length += strlen(str_array[i]) + 1;
988 prop.value = kmalloc(prop.length, GFP_KERNEL);
993 for (i = 0; i < sz; i++) {
994 vp += snprintf(vp, (char *)prop.value + prop.length - vp, "%s",
997 ret = of_changeset_add_prop_helper(ocs, np, &prop);
1002 EXPORT_SYMBOL_GPL(of_changeset_add_prop_string_array);
1005 * of_changeset_add_prop_u32_array - Add a property of 32 bit integers
1006 * property to a changeset
1008 * @ocs: changeset pointer
1009 * @np: device node pointer
1010 * @prop_name: name of the property to be added
1011 * @array: pointer to an array of 32 bit integers
1012 * @sz: number of array elements
1014 * Create a property of 32 bit integers and add it to a changeset.
1016 * Return: 0 on success, a negative error value in case of an error.
1018 int of_changeset_add_prop_u32_array(struct of_changeset *ocs,
1019 struct device_node *np,
1020 const char *prop_name,
1021 const u32 *array, size_t sz)
1023 struct property prop;
1027 val = kcalloc(sz, sizeof(__be32), GFP_KERNEL);
1031 for (i = 0; i < sz; i++)
1032 val[i] = cpu_to_be32(array[i]);
1033 prop.name = (char *)prop_name;
1034 prop.length = sizeof(u32) * sz;
1035 prop.value = (void *)val;
1037 ret = of_changeset_add_prop_helper(ocs, np, &prop);
1042 EXPORT_SYMBOL_GPL(of_changeset_add_prop_u32_array);