diff --git a/common/hw-gfx-dp_dual_mode.ads b/common/hw-gfx-dp_dual_mode.ads
new file mode 100644
index 0000000..3f4dd45
--- /dev/null
+++ b/common/hw-gfx-dp_dual_mode.ads
@@ -0,0 +1,27 @@
+--
+-- Copyright (C) 2021 Angel Pons <th3fanbus@gmail.com>
+--
+-- 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; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- 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.
+--
+
+with HW.GFX.DP_Aux_Ch;
+
+private generic
+
+   type T (<>) is limited private;
+
+   with package Aux_Ch is new DP_Aux_Ch (T => T, others => <>);
+
+package HW.GFX.DP_Dual_Mode is
+
+   procedure Switch_LSPCON (Port : in T);
+
+end HW.GFX.DP_Dual_Mode;