drivers/of/overlay.c

27  * struct target - info about current target node as recursing through overlay
34  * into.  When recursing to the next level of the overlay subtree, the target
37  * subtree does not exist at the same level in the live devicetree, target->np
41 struct target {
49  * @target:	target of the overlay operation
53 	struct device_node *target;
99 		struct target *target, const struct device_node *overlay_node);
166 		nd.target = fragment->target;
173 			pr_err("overlay changeset %s notifier error %d, target: %pOF\n",
174 			       of_overlay_action_name(action), ret, nd.target);
192  * "/fragment_name/__overlay/" portion of the value  with the target
240 	target_path = kasprintf(GFP_KERNEL, "%pOF", fragment->target);
277  * @target:		where @overlay_prop will be placed
282  * entry to add @overlay_prop in @target, else add changeset entry to update
285  * @target may be either in the live devicetree or in a new subtree that
301 		struct target *target, struct property *overlay_prop,
307 	if (target->in_livetree)
313 	if (target->in_livetree)
314 		prop = of_find_property(target->np, overlay_prop->name, NULL);
322 				       target->np);
330 				       target->np);
349 		if (!target->in_livetree) {
350 			new_prop->next = target->np->deadprops;
351 			target->np->deadprops = new_prop;
353 		ret = of_changeset_add_property(&ovcs->cset, target->np,
356 		ret = of_changeset_update_property(&ovcs->cset, target->np,
360 	if (!of_node_check_flag(target->np, OF_OVERLAY))
362 		       target->np, new_prop->name);
375  * @target:	where @node will be placed in live tree or changeset
378  * If @node does not already exist in @target, add changeset entry
379  * to add @node in @target.
381  * If @node already exists in @target, and the existing node has
406 		struct target *target, struct device_node *node)
411 	struct target target_child;
416 	for_each_child_of_node(target->np, tchild)
425 		tchild->parent = target->np;
454 		target_child.in_livetree = target->in_livetree;
465  * @target:		where to place @overlay_node in live tree
478 		struct target *target, const struct device_node *overlay_node)
485 		ret = add_changeset_property(ovcs, target, prop, 0);
488 				 target->np, prop->name, ret);
494 		ret = add_changeset_node(ovcs, target, child);
497 				 target->np, child, ret);
510 		struct target *target,
517 		ret = add_changeset_property(ovcs, target, prop, 1);
520 				 target->np, prop->name, ret);
635 	struct target target;
650 		target.np = fragment->target;
651 		target.in_livetree = true;
652 		ret = build_changeset_next_level(ovcs, &target,
656 				 fragment->target);
664 		target.np = fragment->target;
665 		target.in_livetree = true;
666 		ret = build_changeset_symbols_node(ovcs, &target,
670 				 fragment->target);
679  * Find the target node using a number of different strategies
682  * 1) "target" property containing the phandle of the target
683  * 2) "target-path" property containing the path of the target
694 	ret = of_property_read_u32(info_node, "target", &val);
698 			pr_err("find target, node: %pOF, phandle 0x%x not found\n",
703 	ret = of_property_read_string(info_node, "target-path", &path);
711 				pr_err("find target, node: %pOF, path '%s' not found\n",
718 				pr_err("find target, node: %pOF, path '%s' not found\n",
725 	pr_err("find target, node: %pOF, no target property\n", info_node);
733  * @target_base:	Point to the target node to apply overlay
804 		fragment->target = find_target(node, target_base);
805 		if (!fragment->target) {
824 		fragment->target = of_find_node_by_path("/__symbols__");
826 		if (!fragment->target) {
867 		of_node_put(ovcs->fragments[i].target);
895  * @base:	point to the target node to apply overlay
972  * @base:		pointer for the target node to apply overlay