[RFC PATCH 04/12] device_tree: add qemu_fdt_add_path

[Ying Fang]

From: Andrew Jones <drjones@redhat.com>

qemu_fdt_add_path works like qemu_fdt_add_subnode, except it
also recursively adds any missing parent nodes.

Cc: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 device_tree.c                | 24 ++++++++++++++++++++++++
 include/sysemu/device_tree.h |  1 +
 2 files changed, 25 insertions(+)

diff --git a/device_tree.c b/device_tree.c
index b335dae707..1854be3a02 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -524,6 +524,30 @@ int qemu_fdt_add_subnode(void *fdt, const char *name)
     return retval;
 }
 
+int qemu_fdt_add_path(void *fdt, const char *path)
+{
+    char *parent;
+    int offset;
+
+    offset = fdt_path_offset(fdt, path);
+    if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
+        error_report("%s Couldn't find node %s: %s", __func__, path,
+                     fdt_strerror(offset));
+        exit(1);
+    }
+
+    if (offset != -FDT_ERR_NOTFOUND) {
+        return offset;
+    }
+
+    parent = g_strdup(path);
+    strrchr(parent, '/')[0] = '\0';
+    qemu_fdt_add_path(fdt, parent);
+    g_free(parent);
+
+    return qemu_fdt_add_subnode(fdt, path);
+}
+
 void qemu_fdt_dumpdtb(void *fdt, int size)
 {
     const char *dumpdtb = qemu_opt_get(qemu_get_machine_opts(), "dumpdtb");
diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
index 982c89345f..15fb98af98 100644
--- a/include/sysemu/device_tree.h
+++ b/include/sysemu/device_tree.h
@@ -104,6 +104,7 @@ uint32_t qemu_fdt_get_phandle(void *fdt, const char *path);
 uint32_t qemu_fdt_alloc_phandle(void *fdt);
 int qemu_fdt_nop_node(void *fdt, const char *node_path);
 int qemu_fdt_add_subnode(void *fdt, const char *name);
+int qemu_fdt_add_path(void *fdt, const char *path);
 
 #define qemu_fdt_setprop_cells(fdt, node_path, property, ...)                 \
     do {                                                                      \
-- 
2.23.0