linux-kernel - Re: [PATCH 0/7] DMAENGINE: fixes and PrimeCells

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Message-ID: <k2le9c3a7c21005091026y9140dd46i8020c49ebef7c06c@mail.gmail.com>
Date:	Sun, 9 May 2010 10:26:26 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	jassi brar <jassisinghbrar@...il.com>
Cc:	Linus Walleij <linus.ml.walleij@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/7] DMAENGINE: fixes and PrimeCells

On Sun, May 9, 2010 at 3:06 AM, jassi brar <jassisinghbrar@...il.com> wrote:
> This discussion is purely about what the current DMA API misses and what
> a generic DMA API should do. So, that the current DMA API fills up those
> gap, if possible. I would love to get started implementing the generic
> DMA API for reference but my priorities are decided by my employer.

Well, the only significant miss that has been identified so far is
dynamic channel allocation for the device-to-mem case.  Everything
else can be done with small tweaks to the existing interface.  But
some of this discussion reminds me of Section 2.4 of
Documentaion/SubmittingPatches:

4) Don't over-design.

Don't try to anticipate nebulous future cases which may or may not
be useful:  "Make it as simple as you can, and no simpler."

Let's just wait for the code before outlining what can and cannot be
done, especially given where we started [1].

--
Dan

[1]: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=include/linux/dmaengine.h;hb=v2.6.18#l160
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