From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Jon Hunter <jon-hunter@ti.com>
Cc: device-tree <devicetree-discuss@lists.ozlabs.org>,
linux-omap <linux-omap@vger.kernel.org>,
linux-arm <linux-arm-kernel@lists.infradead.org>,
Nicolas Ferre <nicolas.ferre@atmel.com>,
Benoit Cousson <b-cousson@ti.com>,
Stephen Warren <swarren@nvidia.com>,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
Arnd Bergmann <arnd@arndb.de>, Vinod Koul <vinod.koul@intel.com>,
Dan Williams <djbw@fb.com>
Subject: Re: [PATCH V6 1/2] of: Add generic device tree DMA helpers
Date: Sat, 15 Sep 2012 01:14:31 +0100 [thread overview]
Message-ID: <20120915001431.GB12445@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1347662517-4210-2-git-send-email-jon-hunter@ti.com>
On Fri, Sep 14, 2012 at 05:41:56PM -0500, Jon Hunter wrote:
> 3. Supporting legacy devices not using DMA Engine
>
> These devices present a problem, as there may not be a uniform way to easily
> support them with regard to device tree. Ideally, these should be migrated
> to DMA engine. However, if this is not possible, then they should still be
> able to use this binding, the only constaint imposed by this implementation
> is that when requesting a DMA channel via of_dma_request_slave_channel(), it
> will return a type of dma_chan.
As far as devices not using DMA engine, the answer is we don't support
their specification in the DT model. Note that the legacy OMAP DMA
API is scheduled for removal next year, so it's not going to be around
that much longer.
next prev parent reply other threads:[~2012-09-15 0:14 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 22:41 [PATCH V6 0/2] of: Add generic device tree DMA helpers Jon Hunter
2012-09-14 22:41 ` [PATCH V6 1/2] " Jon Hunter
2012-09-14 22:46 ` Stephen Warren
2012-09-15 0:14 ` Russell King - ARM Linux [this message]
[not found] ` <20120915001431.GB12445-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-09-17 20:42 ` Arnd Bergmann
[not found] ` <201209172042.11860.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-17 23:06 ` David Brown
[not found] ` <20120917230615.GA26502-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2012-09-18 12:50 ` Arnd Bergmann
2012-09-18 22:19 ` Mitch Bradley
[not found] ` <5058F35A.8040702-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-09-18 22:32 ` Russell King - ARM Linux
2012-09-19 11:09 ` Arnd Bergmann
[not found] ` <201209191109.16529.arnd-r2nGTMty4D4@public.gmane.org>
2012-09-19 14:40 ` Mitch Bradley
2012-09-19 13:52 ` Matt Porter
2012-09-19 14:07 ` Matt Porter
2012-09-19 14:24 ` Arnd Bergmann
2012-09-19 14:36 ` Rob Herring
2012-09-19 14:40 ` Matt Porter
2012-09-19 14:50 ` Arnd Bergmann
2012-09-19 21:25 ` Mitch Bradley
2012-09-19 14:10 ` Rob Herring
[not found] ` <1347662517-4210-1-git-send-email-jon-hunter-l0cyMroinI0@public.gmane.org>
2012-09-14 22:41 ` [PATCH V6 2/2] dmaengine: add helper function to request a slave DMA channel Jon Hunter
2012-09-17 3:33 ` Vinod Koul
2012-09-17 11:59 ` Arnd Bergmann
2012-09-17 22:36 ` Russell King - ARM Linux
2012-09-18 3:13 ` Vinod Koul
2012-09-18 13:21 ` Matt Porter
2012-09-18 15:20 ` Arnd Bergmann
2012-09-18 18:10 ` Russell King - ARM Linux
2012-09-24 22:25 ` Jon Hunter
2012-09-25 4:35 ` Vinod Koul
2012-10-16 2:43 ` Shawn Guo
2012-10-16 2:39 ` Vinod Koul
2012-11-09 20:01 ` Jon Hunter
2012-11-16 1:37 ` Vinod Koul
2012-11-16 8:39 ` Nicolas Ferre
2012-11-16 15:45 ` Jon Hunter
2012-11-28 17:06 ` Vinod Koul
2012-12-19 17:12 ` Jon Hunter
2012-12-20 14:57 ` Vinod Koul
2012-09-18 3:00 ` Vinod Koul
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