diff --git a/common/skylake/hw-gfx-gma-plls-dpll.ads b/common/skylake/hw-gfx-gma-plls-dpll.ads
new file mode 100644
index 0000000..61bd55e
--- /dev/null
+++ b/common/skylake/hw-gfx-gma-plls-dpll.ads
@@ -0,0 +1,27 @@
+--
+-- Copyright (C) 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.PLLs.DPLL is
+
+   type Value_Array is array (Configurable_DPLLs) of Word32;
+   Register_Value : constant Value_Array := Value_Array'
+     (DPLL1 => 1, DPLL2 => 2, DPLL3 => 3);
+
+   procedure On
+     (PLL      : in     Configurable_DPLLs;
+      Port_Cfg : in     Port_Config;
+      Success  :    out Boolean);
+
+   procedure Off (PLL : Configurable_DPLLs);
+
+end HW.GFX.GMA.PLLs.DPLL;