# \[PATCH v3 11/14\] dmaengine: pxa: document pxad\_param

- From: Robert Jarzmik \<robert.jarzmik@free.fr\>
- Date: 2018-06-17 17:04:23 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2018/06/5309342
- Thread: https://ratatoskr.run/linux-arm-kernel/2018/06/5309335/t.md

```text
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>
---
Since v1: added Vinod's ack
---
 include/linux/dma/pxa-dma.h | 9 +++++++++
 1 file changed, 9 insertions(+)

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;
-- 
2.11.0
```