linux-kernel - Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

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Date:	Thu, 7 Nov 2013 14:22:05 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc:	Pantelis Antoniou <panto@...oniou-consulting.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

On Thu, Nov 07, 2013 at 08:25:58PM +0100, Sebastian Andrzej Siewior wrote:
> On 06.11.13, Guenter Roeck wrote:
> |…
> thanks for the explanation.
> 
> > 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 overlay would
> > describe its memory and bus number configuration.
> 
> 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 part
> 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?
> 
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, not arm.

Guenter
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