linux-kernel - Re: [PATCH] Documentation: dmaengine: Add a documentation for the dma controller API

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Message-ID: <20140730160607.GM8181@intel.com>
Date:	Wed, 30 Jul 2014 21:36:07 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	dmaengine@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Antoine Ténart <antoine@...e-electrons.com>,
	Thomas Petazzoni <thomas@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Boris Brezillon <boris@...e-electrons.com>,
	Matt Porter <matt.porter@...aro.org>,
	laurent.pinchart@...asonboard.com, ludovic.desroches@...el.com,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: Re: [PATCH] Documentation: dmaengine: Add a documentation for the
 dma controller API

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
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