linux-kernel - Re: ACPI vs Device Tree

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Message-ID: <52183A56.5020707@roeck-us.net>
Date:	Fri, 23 Aug 2013 21:45:10 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Matthew Garrett <mjg59@...f.ucam.org>
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 08/23/2013 08:06 PM, Matthew Garrett wrote:
> On Fri, Aug 23, 2013 at 07:55:31PM -0700, Guenter Roeck wrote:
>
>> Question is: Does this work _today_ with any existing driver, where
>> one interrupt is served through ACPI and another as 'standard' Linux
>> interrupt ? If yes, it must be working, and using fdt to describe
>> the interrupt mapping for the non-ACPI interrupt should not make
>> a difference. If no, the problem does not really have anything
>> to do with fdt.
>
> There's no such thing as an ACPI interrupt, it's just a data source in
> the same way that PnP used to be. _CRS refers to platform interrupts.
>
Ah, you are catching my lack of ACPI knowledge.

Rephrasing the question:

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

Does the situation occur today, ie does it ever happen that one interrupt
for a device is specified (if that is the correct term) in _CRS and
another by some other means ?

Guenter

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