linux-kernel - Re: [PATCH 2/2] x86: intel-mid: add watchdog platform code for Merrifield

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Message-ID: <2205089.MXSpGW1NLo@ws-stein>
Date:	Wed, 09 Apr 2014 16:03:14 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	David Cohen <david.a.cohen@...ux.intel.com>, wim@...ana.be,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: intel-mid: add watchdog platform code for Merrifield

On Wednesday 09 April 2014 14:58:48, One Thousand Gnomes wrote:
> > I'm getting curious: How can I use device-tree on x86(_64)?
> > Reading the dependencies from CONFIG_OF it can only be used on 32bit systems with some special hardware bases.
> > So, how to use otherwise?
> 
> There isn't any fundamental thing tying device tree to a given
> architecture or 32bitness, it's just that sane PC architectures use ACPI
> to enumerate devices, and/or have a discoverable bus architecture.
> 
> Some of the phones don't so this now becoems a point of consideration. In
> fact it's already also used on CE4100 (which is an embedded media SoC
> found in some TV devices and set-top boxes) and on the OLPC (One laptop
> per child). There is no intrinsic reason it couldn't be used in other x86
> special cases.
> 
> If its PC shaped however it probably has ACPI and ACPI and DT are not a
> 1:1 mapping. ACPI has method invocations, and various firmware provided
> interfaces such as the EC, Device tree is better at some other bits.

Yep, like SPI devices on embedded x86 hardware.

> Converting the phones to embedded device tree rather than adding a
> billion little platform files on the other hand seems to me like a
> no-brainer.

I found http://thread.gmane.org/gmane.linux.drivers.devicetree/4475. Why didn't that get into mainline?

Best regards,
Alexander
-- 
Dipl.-Inf. Alexander Stein

SYS TEC electronic GmbH
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