__of_find_node_by_full_name recursively searches for a matching node
with the given full name without taking any locks.
of_find_node_by_full_name takes locks and takes a reference on the
matching node.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
drivers/of/base.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of.h | 4 ++++
2 files changed, 62 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 19bcdb4..08156e6 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1142,6 +1142,64 @@ static void *of_find_property_value_of_size(const struct device_node *np,
}
/**
+ * __of_find_node_by_full_name - Find a node with the full name recursively
+ * @node: Root of the tree to perform the search
+ * @full_name: Full name of the node to find.
+ *
+ * Find a node with the give full name by recursively following any of
+ * the child node links.
+ * Returns the matching node, or NULL if not found.
+ * Note that the devtree lock is not taken, so this function is only
+ * safe to call on either detached trees, or when devtree lock is already
+ * taken.
+ */
+struct device_node *__of_find_node_by_full_name(struct device_node *node,
+ const char *full_name)
+{
+ struct device_node *child, *found;
+
+ if (node == NULL)
+ return NULL;
+
+ /* check */
+ if (of_node_cmp(node->full_name, full_name) == 0)
+ return node;
+
+ __for_each_child_of_node(node, child) {
+ found = __of_find_node_by_full_name(child, full_name);
+ if (found != NULL)
+ return found;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(__of_find_node_by_full_name);
+
+/**
+ * of_find_node_by_full_name - Find a node with the full name recursively
+ * @node: Root of the tree to perform the search
+ * @full_name: Full name of the node to find.
+ *
+ * Find a node with the give full name by recursively following any of
+ * the child node links.
+ * Returns the matching node (with a ref taken), or NULL if not found.
+ */
+struct device_node *of_find_node_by_full_name(struct device_node *node,
+ const char *full_name)
+{
+ unsigned long flags;
+ struct device_node *np;
+
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+ np = of_find_node_by_full_name(node, full_name);
+ of_node_get(np);
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+
+ return np;
+}
+EXPORT_SYMBOL(of_find_node_by_full_name);
+
+/**
* of_property_read_u32_index - Find and read a u32 from a multi-value property.
*
* @np: device node from which the property value is to be read.
diff --git a/include/linux/of.h b/include/linux/of.h
index a8b9dad..bef3d5b 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -223,6 +223,10 @@ extern struct device_node *of_find_matching_node_and_match(
extern struct device_node *of_find_node_by_path(const char *path);
extern struct device_node *of_find_node_by_phandle(phandle handle);
+struct device_node *__of_find_node_by_full_name(struct device_node *node,
+ const char *full_name);
+struct device_node *of_find_node_by_full_name(struct device_node *node,
+ const char *full_name);
extern struct device_node *of_get_parent(const struct device_node *node);
extern struct device_node *of_get_next_parent(struct device_node *node);
extern struct device_node *of_get_next_child(const struct device_node *node,
--
1.7.12
--
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