linux-kernel - Re: ACPI vs Device Tree

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Message-ID: <20130824023806.GA3388@srcf.ucam.org>
Date:	Sat, 24 Aug 2013 03:38:06 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Darren Hart <dvhart@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: ACPI vs Device Tree - moving forward

On Fri, Aug 23, 2013 at 06:47:23PM -0700, Guenter Roeck wrote:
> On Sat, Aug 24, 2013 at 02:10:36AM +0100, Matthew Garrett wrote:
> > On Fri, Aug 23, 2013 at 05:13:45PM -0700, Guenter Roeck wrote:
> > 
> > > Did the group conclude that the idea of FDT augmenting ACPI is not feasible ? 
> > 
> > I think expressing FDT in ACPI is feasible, I'm just not sure it's 
> > desirable. We'd still end up with duplicate information and no mechanism 
> > for drivers to handle both.
> > 
> Not sure I understand what you are saying. My understanding of "augment"
> would be that there is ACPI information, and there is a separate FDT
> (or an FDT overlay) providing additional information. There should be
> no duplicate information in this model.

What happens when you have an ACPI device that contains an interrupt in 
_CRS and contains a different interrupt in an embedded FDT block?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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