dev/portal: implement portal device

Portal is a device that connect devices. Currently, you can only connect
pipes in portal. Pipes are unidirectional. But with portal, you can
construct a bidirectional device with two pipes.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/rtdef.h b/include/rtdef.h
index 6caf713f45..09574d2233 100644
--- a/include/rtdef.h
+++ b/include/rtdef.h
@@ -740,6 +740,7 @@ enum rt_device_class_type
     RT_Device_Class_SDIO,                               /**< SDIO bus device */
     RT_Device_Class_PM,                                 /**< PM pseudo device */
     RT_Device_Class_Pipe,                               /**< Pipe device */
+    RT_Device_Class_Portal,                             /**< Portal device */
     RT_Device_Class_Miscellaneous,                      /**< Miscellaneous device */
     RT_Device_Class_Unknown                             /**< unknown device */
 };