diff --git a/common/hw-gfx-gma-connectors.ads b/common/hw-gfx-gma-connectors.ads
new file mode 100644
index 0000000..91c2801
--- /dev/null
+++ b/common/hw-gfx-gma-connectors.ads
@@ -0,0 +1,36 @@
+--
+-- Copyright (C) 2015-2016 secunet Security Networks AG
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; version 2 of the License.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+private package HW.GFX.GMA.Connectors is
+
+   pragma Warnings (GNATprove, Off, "unused variable ""P*""",
+                    Reason => "Needed for a common interface");
+   procedure Pre_On
+     (Port_Cfg    : in     Port_Config;
+      PLL_Hint    : in     Word32;
+      Pipe_Hint   : in     Word32;
+      Success     :    out Boolean);
+
+   procedure Post_On
+     (Port_Cfg : in     Port_Config;
+      PLL_Hint : in     Word32;
+      Success  :    out Boolean);
+   pragma Warnings (GNATprove, On, "unused variable ""P*""");
+
+   procedure Pre_Off (Port_Cfg : Port_Config);
+   procedure Post_Off (Port_Cfg : Port_Config);
+
+   procedure Pre_All_Off;
+   procedure Post_All_Off;
+
+end HW.GFX.GMA.Connectors;