linux-kernel - Re: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we have people interested in device tree janitoring / cleanup?]

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Date:	Thu, 01 Aug 2013 11:18:35 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	"jonsmirl@...il.com" <jonsmirl@...il.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"ksummit-2013-discuss@...ts.linuxfoundation.org" 
	<ksummit-2013-discuss@...ts.linuxfoundation.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Richard Cochran <richardcochran@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Domenico Andreoli <cavokz@...il.com>, mbizon@...ebox.fr,
	Dave P Martin <Dave.Martin@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Ksummit-2013-discuss] DT bindings as ABI [was: Do we have
 people interested in device tree janitoring / cleanup?]

On Wed, 2013-07-31 at 17:26 -0400, jonsmirl@...il.com wrote:
> Alternatively you may be of the belief that it is impossible to get
> rid of the board specific code. But x86 doesn't have any of it, why
> should ARM?

The reason x86 doesn't have it is because it carries three decades worth
of legacy baggage so that it can still look like a 1980s IBM PC when
necessary.

There *have* been some x86 platforms which abandon that legacy crap, and
for those we *do* have board-specific code. (Is James still maintaining
Voyager support? It feels very strange to talk about Voyager with it
*not* being the 'legacy crap' in question...)

We've even seen *recent* attempts to abandon the legacy crap in the
embedded x86 space, which backtracked and added it all back again — in
part because x86 lacked any sane way to describe the hardware if it
wasn't pretending to be a PC. ACPI doesn't cut it, and DT "wasn't
invented here"...

Unless you want the ARM world to settle on a strategy of "all the world
is an Assabet", I'd be careful what you wish for...

-- 
dwmw2

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