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authorRobert Jarzmik <robert.jarzmik@free.fr>2018-06-17 19:02:14 +0200
committerRobert Jarzmik <robert.jarzmik@free.fr>2018-06-18 21:32:15 +0200
commitb6d1a17f4729e4fda5740a855da91d202db2c118 (patch)
treec5a37a9b301831646d2237ee95bff77ad8ac9d57 /include/linux/dma
parent273340e8bf86de53eef7073993352ea11c563696 (diff)
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>
Diffstat (limited to 'include/linux/dma')
-rw-r--r--include/linux/dma/pxa-dma.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/dma/pxa-dma.h b/include/linux/dma/pxa-dma.h
index e56ec7af4fd7..9fc594f69eff 100644
--- a/include/linux/dma/pxa-dma.h
+++ b/include/linux/dma/pxa-dma.h
@@ -9,6 +9,15 @@ enum pxad_chan_prio {
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 {
unsigned int drcmr;
enum pxad_chan_prio prio;