[PATCH 15/22] OF: base: import of_parse_phandle from Linux OF API

[Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>]

This imports of_parse_phandle from Linux OF API.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
---
Cc: barebox@lists.infradead.org
---
 drivers/of/base.c |   23 +++++++++++++++++++++++
 include/of.h      |   10 ++++++++++
 2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 4689f3e..e729a65 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
diff --git a/include/of.h b/include/of.h
index d782eaf..81df5a6 100644
--- a/include/of.h
+++ b/include/of.h
@@ -214,6 +214,10 @@ extern int of_property_match_string(struct device_node *np,
 extern int of_property_count_strings(struct device_node *np,
 				     const char *propname);
 
+extern struct device_node *of_parse_phandle(const struct device_node *np,
+					    const char *phandle_name,
+					    int index);
+
 extern void of_alias_scan(void);
 extern int of_alias_get_id(struct device_node *np, const char *stem);
 extern const char *of_alias_get(struct device_node *np);
@@ -342,6 +346,12 @@ static inline int of_property_count_strings(struct device_node *np,
 	return -ENOSYS;
 }
 
+static inline struct device_node *of_parse_phandle(const struct device_node *np,
+					    const char *phandle_name, int index)
+{
+	return NULL;
+}
+
 static inline struct device_node *of_find_node_by_path(const char *path)
 {
 	return NULL;
-- 
1.7.2.5


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