[PATCH v5 6/6] device property: Add fwnode_graph_get_port_parent

[Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>]

From: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>

Provide a helper to obtain the parent device fwnode without first
parsing the remote-endpoint as per fwnode_graph_get_remote_port_parent.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
 drivers/base/property.c  | 28 ++++++++++++++++++++++++----
 include/linux/property.h |  2 ++
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 519d290..c2776d7 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1170,6 +1170,26 @@ fwnode_graph_get_next_endpoint(struct fwnode_handle *fwnode,
 EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
 
 /**
+ * fwnode_graph_get_port_parent - Return the device fwnode of a port endpoint
+ * @endpoint: Endpoint firmware node of the port
+ *
+ * Return: the firmware node of the device the @endpoint belongs to.
+ */
+struct fwnode_handle *
+fwnode_graph_get_port_parent(struct fwnode_handle *endpoint)
+{
+	struct fwnode_handle *port, *parent;
+
+	port = fwnode_get_parent(endpoint);
+	parent = fwnode_call_ptr_op(port, graph_get_port_parent);
+
+	fwnode_handle_put(port);
+
+	return parent;
+}
+EXPORT_SYMBOL_GPL(fwnode_graph_get_port_parent);
+
+/**
  * fwnode_graph_get_remote_port_parent - Return fwnode of a remote device
  * @fwnode: Endpoint firmware node pointing to the remote endpoint
  *
@@ -1178,12 +1198,12 @@ EXPORT_SYMBOL_GPL(fwnode_graph_get_next_endpoint);
 struct fwnode_handle *
 fwnode_graph_get_remote_port_parent(struct fwnode_handle *fwnode)
 {
-	struct fwnode_handle *port, *parent;
+	struct fwnode_handle *endpoint, *parent;
 
-	port = fwnode_graph_get_remote_port(fwnode);
-	parent = fwnode_call_ptr_op(port, graph_get_port_parent);
+	endpoint = fwnode_graph_get_remote_endpoint(fwnode);
+	parent = fwnode_graph_get_port_parent(endpoint);
 
-	fwnode_handle_put(port);
+	fwnode_handle_put(endpoint);
 
 	return parent;
 }
diff --git a/include/linux/property.h b/include/linux/property.h
index 0597a74..7e77039 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -275,6 +275,8 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen);
 
 struct fwnode_handle *fwnode_graph_get_next_endpoint(
 	struct fwnode_handle *fwnode, struct fwnode_handle *prev);
+struct fwnode_handle *
+fwnode_graph_get_port_parent(struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_graph_get_remote_port_parent(
 	struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_graph_get_remote_port(
-- 
2.7.4

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