[Qemu-devel] [PATCH 05/31] dt: add helper for phandle enumeration

[Alexander Graf]

This patch adds a helper to search for a node's phandle by its path. This
is especially useful when the phandle is part of an array, not just a single
cell in which case qemu_devtree_setprop_phandle would be the easy choice.

Signed-off-by: Alexander Graf <ag...@suse.de>
---
 device_tree.c |   16 +++++++++++++++-
 device_tree.h |    1 +
 2 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/device_tree.c b/device_tree.c
index 6cbc5af..6745d17 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -162,10 +162,24 @@ int qemu_devtree_setprop_string(void *fdt, const char 
*node_path,
     return r;
 }
 
+uint32_t qemu_devtree_get_phandle(void *fdt, const char *path)
+{
+    uint32_t r;
+
+    r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
+    if (r <= 0) {
+        fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,
+                path, fdt_strerror(r));
+        exit(1);
+    }
+
+    return r;
+}
+
 int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
                                  const char *property, const char *string)
 {
-    uint32_t phandle = fdt_get_phandle(fdt, findnode_nofail(fdt, string));
+    uint32_t phandle = qemu_devtree_get_phandle(fdt, string);
     return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
 }
 
diff --git a/device_tree.h b/device_tree.h
index 2e87c58..376287a 100644
--- a/device_tree.h
+++ b/device_tree.h
@@ -33,6 +33,7 @@ int qemu_devtree_setprop_string(void *fdt, const char 
*node_path,
                                 const char *property, const char *string);
 int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
                                  const char *property, const char *string);
+uint32_t qemu_devtree_get_phandle(void *fdt, const char *path);
 int qemu_devtree_nop_node(void *fdt, const char *node_path);
 int qemu_devtree_add_subnode(void *fdt, const char *name);
 
-- 
1.6.0.2