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dmaengine: pxa: document pxad_param 

Add some documentation for the pxad_param structure, and describe the
contract behind the minimal required priority of a DMA channel.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Robert Jarzmik 2018-06-17 19:02:14 +02:00
parent 273340e8bf
commit b6d1a17f47
1 changed files with 9 additions and 0 deletions
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9
include/linux/dma/pxa-dma.h
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@ -9,6 +9,15 @@ enum pxad_chan_prio {
PXAD_PRIO_LOWEST, PXAD_PRIO_LOWEST,
}; };
/**
* struct pxad_param - dma channel request parameters
* @drcmr: requestor line number
* @prio: minimal mandatory priority of the channel
*
* If a requested channel is granted, its priority will be at least @prio,
* ie. if PXAD_PRIO_LOW is required, the requested channel will be either
* PXAD_PRIO_LOW, PXAD_PRIO_NORMAL or PXAD_PRIO_HIGHEST.
*/
struct pxad_param { struct pxad_param {
unsigned int drcmr; unsigned int drcmr;
enum pxad_chan_prio prio; enum pxad_chan_prio prio;