linux-kernel - Re: [RFC v3 4/7] dmaengine: Add slave DMA interface

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Date:	Wed, 13 Feb 2008 09:03:10 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	"Dan Williams" <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	"Shannon Nelson" <shannon.nelson@...el.com>,
	"David Brownell" <david-b@...bell.net>, kernel@...32linux.org,
	"Francis Moreau" <francis.moro@...il.com>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	"Vladimir A. Barinov" <vbarinov@...mvista.com>,
	"Pierre Ossman" <drzeus-list@...eus.cx>
Subject: Re: [RFC v3 4/7] dmaengine: Add slave DMA interface

On Wed, 13 Feb 2008 00:21:41 -0700
"Dan Williams" <dan.j.williams@...el.com> wrote:

> On Feb 12, 2008 9:43 AM, Haavard Skinnemoen <hskinnemoen@...el.com> wrote:
> [..]
> > +enum dma_slave_direction {
> > +       DMA_SLAVE_TO_MEMORY,
> > +       DMA_SLAVE_FROM_MEMORY,
> > +};
> 
> Just reuse enum dma_data_direction from the dma-mapping api.

Hmm...ok. That will add two "directions" that are a bit useless in this
context (DMA_BIDIRECTIONAL and DMA_NONE.) But I guess it's still worth
it since we can pass the direction on unchanged when syncing the
buffers.

Haavard
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