[Skiboot] [PATCH 09/14] dt: add dt_new_check()

[Oliver O'Halloran]

This is similar to dt_new(), but if the node already exists it will
return the existing node. This is useful because some init code depends
on the presence of certain nodes, but where the node is actually created
is unimportant.

Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
---
 core/device.c    | 14 ++++++++++++++
 include/device.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/core/device.c b/core/device.c
index d0731b149177..30b31f461c45 100644
--- a/core/device.c
+++ b/core/device.c
@@ -352,6 +352,20 @@ struct dt_node *dt_find_by_name(struct dt_node *root, const char *name)
 	return NULL;
 }
 
+
+struct dt_node *dt_new_check(struct dt_node *parent, const char *name)
+{
+	struct dt_node *node = dt_find_by_name(parent, name);
+
+	if (!node) {
+		node = dt_new(parent, name);
+		assert(node);
+	}
+
+	return node;
+}
+
+
 struct dt_node *dt_find_by_phandle(struct dt_node *root, u32 phandle)
 {
 	struct dt_node *node;
diff --git a/include/device.h b/include/device.h
index 4198a41c1b91..1ad403f18450 100644
--- a/include/device.h
+++ b/include/device.h
@@ -67,6 +67,7 @@ struct dt_node *dt_new_addr(struct dt_node *parent, const char *name,
 			    uint64_t unit_addr);
 struct dt_node *dt_new_2addr(struct dt_node *parent, const char *name,
 			     uint64_t unit_addr0, uint64_t unit_addr1);
+struct dt_node *dt_new_check(struct dt_node *parent, const char *name);
 
 /* Copy node to new parent, including properties and subnodes */
 struct dt_node *dt_copy(struct dt_node *node, struct dt_node *parent);
-- 
2.7.4