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Message-Id: <201301111140.41584.arnd@arndb.de>
Date: Fri, 11 Jan 2013 11:40:41 +0000
From: Arnd Bergmann <arnd@...db.de>
To: Matt Porter <mporter@...com>
Cc: Tony Lindgren <tony@...mide.com>, Sekhar Nori <nsekhar@...com>,
Grant Likely <grant.likely@...retlab.ca>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Benoit Cousson <b-cousson@...com>,
Russell King <linux@....linux.org.uk>,
Vinod Koul <vinod.koul@...el.com>,
Rob Landley <rob@...dley.net>, Chris Ball <cjb@...top.org>,
Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
Linux OMAP List <linux-omap@...r.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
Linux DaVinci Kernel List
<davinci-linux-open-source@...ux.davincidsp.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Documentation List <linux-doc@...r.kernel.org>,
Linux MMC List <linux-mmc@...r.kernel.org>,
Linux SPI Devel List
<spi-devel-general@...ts.sourceforge.net>,
Dan Williams <djbw@...com>,
Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v4 00/14] DMA Engine support for AM33XX
On Friday 11 January 2013, Matt Porter wrote:
> The approach taken is similar to how OMAP DMA is being converted to
> DMA Engine support. With the functional EDMA private API already
> existing in mach-davinci/dma.c, we first move that to an ARM common
> area so it can be shared. Adding DT and runtime PM support to the
> private EDMA API implementation allows it to run on AM33xx. AM33xx
> only boots using DT so we leverage Jon's generic DT DMA helpers to
> register EDMA DMAC with the of_dma framework and then add support
> for calling the dma_request_slave_channel() API to both the mmc
> and spi drivers.
I think this looks very good. What I wonder is whether we should
make the non-DT parts of the dmaengine driver compile-time
conditional on CONFIG_ATAGS though, so the slave drivers don't
have a link-time dependency on the dmaengine driver's
omap_dma_filter_fn symbol when building without ATAGS support.
Arnd
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