[XEN][RFC PATCH v3 05/14] xen/device-tree: Add _dt_find_node_by_path() to find nodes in device tree

[Vikram Garhwal <fnu.vikram@xxxxxxxxxx>]

Add _dt_find_by_path() to find a matching node with path for a dt_device_node.

Signed-off-by: Vikram Garhwal <fnu.vikram@xxxxxxxxxx>
---
 xen/common/device_tree.c      | 10 ++++++++--
 xen/include/xen/device_tree.h |  9 +++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index f43d66a501..2e334f949e 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -358,17 +358,23 @@ struct dt_device_node *dt_find_node_by_type(struct 
dt_device_node *from,
     return np;
 }
 
-struct dt_device_node *dt_find_node_by_path(const char *path)
+struct dt_device_node *_dt_find_node_by_path(struct dt_device_node *dt,
+                                             const char *path)
 {
     struct dt_device_node *np;
 
-    dt_for_each_device_node(dt_host, np)
+    dt_for_each_device_node(dt, np)
         if ( np->full_name && (dt_node_cmp(np->full_name, path) == 0) )
             break;
 
     return np;
 }
 
+struct dt_device_node *dt_find_node_by_path(const char *path)
+{
+    return _dt_find_node_by_path(dt_host, path);
+}
+
 int dt_find_node_by_gpath(XEN_GUEST_HANDLE(char) u_path, uint32_t u_plen,
                           struct dt_device_node **node)
 {
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 06d7866c10..9da32a851e 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -525,6 +525,15 @@ struct dt_device_node *dt_find_node_by_alias(const char 
*alias);
  */
 struct dt_device_node *dt_find_node_by_path(const char *path);
 
+/**
+ * _dt_find_node_by_path - Find a node matching a full DT path
+ * @dt_node: The device tree to search
+ * @path: The full path to match
+ *
+ * Returns a node pointer.
+ */
+struct dt_device_node *_dt_find_node_by_path(struct dt_device_node *dt,
+                                             const char *path);
 
 /**
  * dt_find_node_by_gpath - Same as dt_find_node_by_path but retrieve the
-- 
2.17.1