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dmaengine: Clarify device parameter for dma_sync_*_for_*() 

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
hifive-unleashed-5.1
Geert Uytterhoeven 2014-07-11 17:56:21 +02:00 committed by Vinod Koul
parent 211bfef7c2
commit 70c9b8bd7a
1 changed files with 4 additions and 2 deletions
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6
Documentation/dmaengine.txt
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@ -100,8 +100,10 @@ The slave DMA usage consists of following steps:
The peripheral driver is expected to have mapped the scatterlist for
the DMA operation prior to calling device_prep_slave_sg, and must
keep the scatterlist mapped until the DMA operation has completed.
The scatterlist must be mapped using the DMA struct device. So,
normal setup should look like this:
The scatterlist must be mapped using the DMA struct device.
If a mapping needs to be synchronized later, dma_sync_*_for_*() must be
called using the DMA struct device, too.
So, normal setup should look like this:
nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len);
if (nr_sg == 0)