]> git.karo-electronics.de Git - linux-beck.git/commit
dmaengine: add interface of dma_get_slave_channel
authorZhangfei Gao <zhangfei.gao@linaro.org>
Fri, 28 Jun 2013 12:39:12 +0000 (20:39 +0800)
committerVinod Koul <vinod.koul@intel.com>
Tue, 13 Aug 2013 11:02:59 +0000 (16:32 +0530)
commit7bb587f4eef8f71ce589f360ab99bb54ab0fc85d
treef2ab1f2830f68fe172224765f366c176d809717f
parentc095ba7224d8edc71dcef0d655911399a8bd4a3f
dmaengine: add interface of dma_get_slave_channel

Suggested by Arnd, add dma_get_slave_channel interface
Dma host driver could get specific channel specificied by request line, rather than filter.

host example:
static struct dma_chan *xx_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct xx_dma_dev *d = ofdma->of_dma_data;
unsigned int request = dma_spec->args[0];

if (request > d->dma_requests)
return NULL;

return dma_get_slave_channel(&(d->chans[request].vc.chan));
}

probe:
of_dma_controller_register((&op->dev)->of_node, xx_of_dma_simple_xlate, d);

Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
drivers/dma/dmaengine.c
include/linux/dmaengine.h