1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 865d3f66c86b..b2cee3db5ceb 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1884,3 +1884,34 @@ int of_device_is_stdout_path(struct device_node *dn)
         return of_stdout == dn;
 }
 EXPORT_SYMBOL_GPL(of_device_is_stdout_path);
+
+/**
+ *      of_find_next_cache_node - Find a node's subsidiary cache
+ *      @np:    node of type "cpu" or "cache"
+ *
+ *      Returns a node pointer with refcount incremented, use
+ *      of_node_put() on it when done.  Caller should hold a reference
+ *      to np.
+ */
+struct device_node *of_find_next_cache_node(const struct device_node *np)
+{
+        struct device_node *child;
+        const phandle *handle;
+
+        handle = of_get_property(np, "l2-cache", NULL);
+        if (!handle)
+                handle = of_get_property(np, "next-level-cache", NULL);
+
+        if (handle)
+                return of_find_node_by_phandle(be32_to_cpup(handle));
+
+        /* OF on pmac has nodes instead of properties named "l2-cache"
+         * beneath CPU nodes.
+         */
+        if (!strcmp(np->type, "cpu"))
+                for_each_child_of_node(np, child)
+                        if (!strcmp(child->type, "cache"))
+                                return child;
+
+        return NULL;
+}