From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH 0/2] Revert support for reserved memory regions defined
 in device tree
Date: Wed, 20 Nov 2013 09:01:44 +1100
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To: Grant Likely <grant.likely@secretlab.ca>
Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org, Laura Abbott <lauraa@codeaurora.org>, Pawel Moll <pawel.moll@arm.com>, Arnd Bergmann <arnd@arndb.de>, Stephen Warren <swarren@wwwdotorg.org>, Tomasz Figa <t.figa@samsung.com>, Tomasz Figa <tomasz.figa@gmail.com>, Michal Nazarewicz <mina86@mina86.com>, linaro-mm-sig@lists.linaro.org, Marc <marc.ceeeee@gmail.com>, Kyungmin Park <kyungmin.park@samsung.com>, Sylwester Nawrocki <s.nawrocki@samsung.com>, Kumar Gala <galak@codeaurora.org>, Olof Johansson <olof@lixom.net>, Ian Campbell <ian.campbell@citrix.com>, Nishanth Peethambaran <nishanth.p@gmail.com>, Sascha Hauer <s.hauer@pengutronix.de>, linux-arm-kernel@lists.infradead.org, Marek Szyprowski <m.szyprowski@samsung.com>
List-Id: devicetree@vger.kernel.org

On Tue, 2013-11-19 at 15:14 +0000, Grant Likely wrote:
> > The proposal look good for me. I'm not convinced that we really need the
> > support for 'reg' property, as the fixed memory region is a special case
> > of generic dynamic allocation specified by the size and alloc-ranges, but
> > I assume that there have been already a long discussion about this, so I
> > accept the common consensus.
> 
> It is absolutely necessary for some use cases. For example, a
> framebuffer enabled by firmware and passed onto the kernel for
> flicker-free boot. Some platforms have fixed regions that cannot be
> moved up.

Arguably that could be covered with alloc-range and size by making the range be
the reg property content basically (and thus size == size of range) but I
prefer the reg property, it's a clearer statement of intent.

Cheers,
Ben.