linux-kernel - Re: [PATCH 5/5] Add DMA engine driver for Freescale MPC85xxprocessors.

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Date:	Thu, 13 Sep 2007 09:25:57 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Zhang Wei-r63237" <Wei.Zhang@...escale.com>
Cc:	"Wood Scott-B07421" <scottwood@...escale.com>, paulus@...ba.org,
	shannon.nelson@...el.com, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] Add DMA engine driver for Freescale MPC85xxprocessors.

On 9/13/07, Zhang Wei-r63237 <Wei.Zhang@...escale.com> wrote:
> Hi,
>
> > > +static void fsl_dma_set_src(dma_addr_t addr,
> > > +                           struct dma_async_tx_descriptor
> > *tx, int index)
> > > +{
> >
> > What is index supposed to mean?  It's not used, or documented
> > anywhere than
> > I can see.
>
> I've also got more document here. Hi, Dan, could you give me some
> explanation about this API? :)
>
The index field gets used for multi-source (or multi-dest) operations.
 XOR, for example, is a multi-source operation.  I am preparing a
documentation patch.

[..]

--
Dan
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