1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index d6dc5e74c27c..70b60845140e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -18,6 +18,12 @@
  */
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/spinlock.h>
+
+/* use when traversing tree through the allnext, child, sibling,
+ * or parent members of struct device_node.
+ */
+DEFINE_RWLOCK(devtree_lock);
 
 int of_n_addr_cells(struct device_node *np)
 {
@@ -51,6 +57,26 @@ int of_n_size_cells(struct device_node *np)
 }
 EXPORT_SYMBOL(of_n_size_cells);
 
+struct property *of_find_property(const struct device_node *np,
+                                  const char *name,
+                                  int *lenp)
+{
+        struct property *pp;
+
+        read_lock(&devtree_lock);
+        for (pp = np->properties; pp != 0; pp = pp->next) {
+                if (of_prop_cmp(pp->name, name) == 0) {
+                        if (lenp != 0)
+                                *lenp = pp->length;
+                        break;
+                }
+        }
+        read_unlock(&devtree_lock);
+
+        return pp;
+}
+EXPORT_SYMBOL(of_find_property);
+
 /*
  * Find a property with a given name for a given node
  * and return the value.