On Wed, Jul 30, 2014 at 06:03:13PM +0200, Maxime Ripard wrote:

The dmaengine is neither trivial nor properly documented at the moment, which
means a lot of trial and error development, which is not that good for such a
central piece of the system.

Attempt at making such a documentation.

Did you miss Documentation/dmaengine.txt, lots of this is already covered
there. But yes i would be really glad to know what isnt, so that we can fix
that.

+  * device_slave_caps
+    - Isn't that redundant with the cap_mask already?
+    - Only a few drivers seem to implement it

For audio to know what your channel can do rather than hardcoding it

+
+  * dma cookies?

cookie is dma transaction representation which is monotonically incrementing
number.

-- 
~Vinod