[Skiboot] [RFC PATCH 1/5] 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 9e7ef0d448d9..bd0674e31fda 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 ed4fc460598f..47ec95b92528 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);
-- 
2.5.5