From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Jon Medhurst (Tixy)" <tixy@linaro.org>
Subject: Re: [PATCH v6 05/11] drivers: of: add automated assignment of
 reserved regions to client devices
Date: Wed, 14 May 2014 10:15:38 +0100
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To: Grant Likely <grant.likely@linaro.org>, Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Mark Rutland <mark.rutland@arm.com>, linux-doc@vger.kernel.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Tomasz Figa <t.figa@samsung.com>, Will Deacon <will.deacon@arm.com>, Tomasz Figa <tomasz.figa@gmail.com>, Paul Mackerras <paulus@samba.org>, Pawel Moll <pawel.moll@arm.com>, Josh Cartwright <joshc@codeaurora.org>, Catalin Marinas <catalin.marinas@arm.com>, devicetree@vger.kernel.org, Laura Abbott <lauraa@codeaurora.org>, Ian Campbell <ian.campbell@citrix.com>, Arnd Bergmann <arnd@arndb.de>, Stephen Warren <swarren@wwwdotorg.org>, Sascha Hauer <s.hauer@pengutronix.de>, Michal Nazarewicz <mina86@mina86.com>, linaro-mm-sig@lists.linaro.org, Marc <marc.ceeeee@gmail.com>, Nishanth Peethambaran <nishanth.p@gmail.com>, Rob Herring <robh+dt@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Kumar Gala <galak@codeaurora.org>, Olof
List-Id: devicetree@vger.kernel.org

On Sun, 2014-03-02 at 13:40 +0800, Grant Likely wrote:
> On Fri, 28 Feb 2014 14:42:50 +0100, Marek Szyprowski <m.szyprowski@samsung.com> wrote:
> > This patch adds code for automated assignment of reserved memory regions
> > to struct device. reserved_mem->ops->device_init()/device_cleanup()
> > callbacks are called to perform reserved memory driver specific
> > initialization and cleanup
> > 
> > Based on previous code provided by Josh Cartwright <joshc@codeaurora.org>
> > 
> > Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> 
> Hi Marek,
> 
> I've not applied this one yet, only because there is still the open
> issue of whether or not these functions should be called from drivers or
> from core code. I don't actually have any problems with the content of
> this patch. Once the user is sorted out I'll merge it.

Has anything more come of these patches? I see some of the series is now
in Linux 3.15, but the actual patches to let people use the feature
aren't there yet, namely patches 5 though 8.

My personal immediate interest in these is as a mechanism on arm64 to
limit CMA to a region of memory that is actually DMA-able devices (e.g.
below 4GB for 32-bit devices without an iommu).

For reference, the mail archives for this series is at
http://lkml.org/lkml/2014/2/28/237

-- 
Tixy