From mboxrd@z Thu Jan  1 00:00:00 1970
From: Guenter Roeck <linux-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org>
Subject: Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays
Date: Thu, 7 Nov 2013 14:22:05 -0800
Message-ID: <20131107222205.GA24450@roeck-us.net>
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To: Sebastian Andrzej Siewior <sebastian-E0PNVn5OA6ohrxcnuTQ+TQ@public.gmane.org>
Cc: Pantelis Antoniou <panto-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>, Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>, Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>, Matt Porter <matt.porter-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Koen Kooi <koen-QLwJDigV5abLmq1fohREcCpxlwaOVQ5f@public.gmane.org>, Alison Chaiken <Alison_Chaiken-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org>, Dinh Nguyen <dinh.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Jan Lubbe <jluebbe-H4yykcOXDpCzQB+pC5nmwQ@public.gmane.org>, Alexander Sverdlin <alexander.sverdlin-OYasijW0DpE@public.gmane.org>, Michael Stickel <ms-g5CePrrZ5ROELgA04lAiVw@public.gmane.org>, Dirk Behme <dirk.behme-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Alan Tull <delicious.quinoa-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>, Michael Bohan <mbohan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>, Ionut Nicu <ioan.nicu.ext-OYasijW0DpE@public.gmane.org>, Michal Simek <monstr-pSz03upnqPeHXe+LvDLADg@public.gmane.org>, Matt Ranostay <mranostay-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-Id: devicetree@vger.kernel.org

On Thu, Nov 07, 2013 at 08:25:58PM +0100, Sebastian Andrzej Siewior wro=
te:
> On 06.11.13, Guenter Roeck wrote:
> |=E2=80=A6
> thanks for the explanation.
>=20
> > We use DT overlays to describe the hardware on those boards and, if=
 necessary,
> > its configuration. For example, if there is a PCIe switch, the over=
lay would
> > describe its memory and bus number configuration.
>=20
> So have your "fix" configuration and a few overlays you switch at
> runtime. The problem you have is that you want to switch a specific p=
art
> if your configuration at runtime. I assume you run DT on ARM. What
> happens if you swtich from ARM to x86 and you "keep" your FPGA
> configuration requirement? You can't use both, DT and ACPI, right? So
> what happens then?
>=20
We intend to use DT on x86 to augment ACPI data. There is a variety of =
reasons
why we can not use ACPI, nor do we want to as we prefer a single method=
 for
handling OIR on all platforms. FWIW, the non-x86 platform is powerpc, n=
ot arm.

Guenter
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