linux-kernel - Re: [PATCH] ARM: /proc/atags: Export also for DT

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Date:	Wed, 28 Jan 2015 16:13:17 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Rob Herring <robherring2@...il.com>
Cc:	Nicolas Pitre <nico@...xnic.net>,
	Pali Rohár <pali.rohar@...il.com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Sebastian Reichel <sre@...ian.org>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: /proc/atags: Export also for DT

On Wed, Jan 28, 2015 at 09:57:18AM -0600, Rob Herring wrote:
> I'm fine with that, but we just need to have a standard kernel
> userspace interface in addition to something like
> /proc/device-tree/bootreason. Perhaps this can be the default
> implementation for the watchdog dev. Someday when we decide DT is crap
> and have a new boot interface, we'll have people relying on
> /proc/device-tree. I hope to be retired when that happens...

Anyone who thinks that DT can be replaced in the same way that we made
the mistake with ATAGs would really need their head examined.

As you point out, removing DT removes the /proc/device-tree/ sub-tree.
Whether we like it or not, that is a userspace API, one which we have
users of already.  That pretty much means that we can't remove DT for
existing platforms or any platform we have now converted to DT.

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