OF: base: import of_parse_phandle from Linux OF API

This imports of_parse_phandle from Linux OF API.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index b6d2b59165..309d236b36 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -839,6 +839,29 @@ int of_property_write_u32_array(struct device_node *np,
 }
 
 /**
+ * of_parse_phandle - Resolve a phandle property to a device_node pointer
+ * @np: Pointer to device node holding phandle property
+ * @phandle_name: Name of property holding a phandle value
+ * @index: For properties holding a table of phandles, this is the index into
+ *         the table
+ *
+ * Returns the device_node pointer found or NULL.
+ */
+struct device_node *of_parse_phandle(const struct device_node *np,
+				     const char *phandle_name, int index)
+{
+	const __be32 *phandle;
+	int size;
+
+	phandle = of_get_property(np, phandle_name, &size);
+	if ((!phandle) || (size < sizeof(*phandle) * (index + 1)))
+		return NULL;
+
+	return of_find_node_by_phandle(be32_to_cpup(phandle + index));
+}
+EXPORT_SYMBOL(of_parse_phandle);
+
+/**
  * of_parse_phandles_with_args - Find a node pointed by phandle in a list
  * @np:		pointer to a device tree node containing a list
  * @list_name:	property name that contains a list