dmaengine: Create a generic dma_slave_caps callback
authorMaxime Ripard <maxime.ripard@free-electrons.com>
Mon, 17 Nov 2014 13:42:04 +0000 (14:42 +0100)
committerVinod Koul <vinod.koul@intel.com>
Mon, 22 Dec 2014 06:58:56 +0000 (12:28 +0530)
commitcb8cea513c80db1dfe2dce468d2d0772005bb9a1
tree44dcb2103f8b2023d0c6b1bab113bfeacdfd5165
parent4f8ef9f4140cc286d7d1cf9237da7a7439e4fc0b
dmaengine: Create a generic dma_slave_caps callback

dma_slave_caps is very important to the generic layers that might interact with
dmaengine, such as ASoC. Unfortunately, it has been added as yet another
dma_device callback, and most of the existing drivers haven't implemented it,
reducing its reliability.

Introduce a generic behaviour to implement this, that rely on both the split of
device_control to derive which functions are supported and on new variables to
be set in the dma_device structure.

These variables holds what used to be the capabilities, that were set
per-channel. However, this proved to be a bit overkill, since every driver
filling these so far were hardcoding it, disregarding which channel was
actually given.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
include/linux/dmaengine.h