greybus: connection: add helper to create control connections

Add dedicated helper to create control connections.

This will allow us to simplify the generic (dynamic) interface.
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/connection.c

@@ -222,6 +222,12 @@ gb_connection_create_static(struct gb_host_device *hd, u16 hd_cport_id)
 	return gb_connection_create(hd, hd_cport_id, NULL, NULL, 0, 0);
 }
 
+struct gb_connection *
+gb_connection_create_control(struct gb_interface *intf)
+{
+	return gb_connection_create(intf->hd, -1, intf, NULL, 0, 0);
+}
+
 struct gb_connection *
 gb_connection_create_dynamic(struct gb_interface *intf,
 					struct gb_bundle *bundle,

drivers/staging/greybus/connection.h

@@ -57,6 +57,7 @@ struct gb_connection {
 
 struct gb_connection *gb_connection_create_static(struct gb_host_device *hd,
 				u16 hd_cport_id);
+struct gb_connection *gb_connection_create_control(struct gb_interface *intf);
 struct gb_connection *gb_connection_create_dynamic(struct gb_interface *intf,
 				struct gb_bundle *bundle, u16 cport_id,
 				u8 protocol_id);

drivers/staging/greybus/control.c

@@ -186,9 +186,7 @@ struct gb_control *gb_control_create(struct gb_interface *intf)
 	if (!control)
 		return NULL;
 
-	control->connection = gb_connection_create_dynamic(intf, NULL,
-						GB_CONTROL_CPORT_ID,
-						GREYBUS_PROTOCOL_CONTROL);
+	control->connection = gb_connection_create_control(intf);
 	if (!control->connection) {
 		dev_err(&intf->dev, "failed to create control connection\n");
 		kfree(control);