[PATCHv3 4/5] of: Added of_set_property_to_child_phandle

[Teresa Gámez]

Set a property to a phandle of a child node. This may be used
for selections like display-timings.

Signed-off-by: Teresa Gámez <t.gamez at phytec.de>
---
 drivers/of/base.c | 21 +++++++++++++++++++++
 include/of.h      |  1 +
 2 files changed, 22 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f363cc1..e9f0883 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -356,6 +356,27 @@ phandle of_node_create_phandle(struct device_node *node)
 }
 EXPORT_SYMBOL(of_node_create_phandle);
 
+int of_set_property_to_child_phandle(struct device_node *node, char *prop_name)
+{
+	int ret;
+	phandle p;
+
+	/* Check if property exist */
+	if (!of_get_property(of_get_parent(node), prop_name, NULL))
+		return -EINVAL;
+
+	/* Create or get existing phandle of child node */
+	p = of_node_create_phandle(node);
+	p = cpu_to_be32(p);
+
+	node = of_get_parent(node);
+
+	ret = of_set_property(node, prop_name, &p, sizeof(p), 0);
+
+	return ret;
+}
+EXPORT_SYMBOL(of_set_property_to_child_phandle);
+
 /*
  * Find a property with a given name for a given node
  * and return the value.
diff --git a/include/of.h b/include/of.h
index decf151..29694a9 100644
--- a/include/of.h
+++ b/include/of.h
@@ -714,6 +714,7 @@ int of_device_disable_path(const char *path);
 
 phandle of_get_tree_max_phandle(struct device_node *root);
 phandle of_node_create_phandle(struct device_node *node);
+int of_set_property_to_child_phandle(struct device_node *node, char *prop_name);
 struct device_node *of_find_node_by_alias(struct device_node *root,
 		const char *alias);
 struct device_node *of_find_node_by_path_or_alias(struct device_node *root,
-- 
1.9.1