dmaengine: add helper function to request a slave DMA channel
authorJon Hunter <jon-hunter@ti.com>
Fri, 14 Sep 2012 22:41:57 +0000 (17:41 -0500)
committerVinod Koul <vinod.koul@intel.com>
Mon, 7 Jan 2013 04:57:45 +0000 (20:57 -0800)
commit9a6cecc846169159bfce511f4c0034bb96eea1ca
treee5d0dcef464741a0988e4355744a33cb55e6bcd4
parentd1c3ed669a2d452cacfb48c2d171a1f364dae2ed
dmaengine: add helper function to request a slave DMA channel

Currently slave DMA channels are requested by calling dma_request_channel()
and requires DMA clients to pass various filter parameters to obtain the
appropriate channel.

With device-tree being used by architectures such as arm and the addition of
device-tree helper functions to extract the relevant DMA client information
from device-tree, add a new function to request a slave DMA channel using
device-tree. This function is currently a simple wrapper that calls the
device-tree of_dma_request_slave_channel() function.

Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <djbw@fb.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Reviewed-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
drivers/dma/dmaengine.c
include/linux/dmaengine.h