diff --git a/common/tigerlake/hw-gfx-gma-power_and_clocks.ads b/common/tigerlake/hw-gfx-gma-power_and_clocks.ads
new file mode 100644
index 0000000..72854e8
--- /dev/null
+++ b/common/tigerlake/hw-gfx-gma-power_and_clocks.ads
@@ -0,0 +1,44 @@
+--
+-- Copyright (C) 2022 Google, LLC
+--
+-- 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.GMA.Config_Helpers;
+
+private package HW.GFX.GMA.Power_And_Clocks is
+
+   pragma Warnings (Off, "subprogram ""*"" has no effect",
+                    Reason => "Not yet implemented.");
+   procedure Pre_All_Off;
+   procedure Post_All_Off;
+
+   procedure Initialize;
+
+   pragma Warnings (Off, """Configs"" is not modified, could be IN",
+                    Reason => "Not yet implemented.");
+   procedure Limit_Dotclocks
+     (Configs           : in out Pipe_Configs;
+      CDClk_Switch      : out Boolean)
+   with
+      Post => Config_Helpers.Stable_FB (Configs'Old, Configs);
+   procedure Update_CDClk (Configs : in out Pipe_Configs)
+   with
+      Post => Config_Helpers.Stable_FB (Configs'Old, Configs);
+   pragma Warnings (On, """Configs"" is not modified, could be IN");
+   procedure Enable_CDClk is null;
+
+   procedure Power_Set_To (Configs : Pipe_Configs);
+   procedure Power_Up (Old_Configs, New_Configs : Pipe_Configs);
+   procedure Power_Down (Old_Configs, Tmp_Configs, New_Configs : Pipe_Configs);
+   pragma Warnings (On, "subprogram ""*"" has no effect");
+
+end HW.GFX.GMA.Power_And_Clocks;