linux-kernel - Re: [PATCH v3 2/2] DMAEngine: Add DMAEngine driver based on old MSM DMA APIs

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Date:	Wed, 14 Mar 2012 08:05:53 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Ravi Kumar V <kumarrav@...eaurora.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bryan Huntsman <bryanh@...eaurora.org>,
	gregkh@...uxfoundation.org,
	Dan Williams <dan.j.williams@...el.com>,
	David Brown <davidb@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/2] DMAEngine: Add DMAEngine driver based on old MSM
 DMA APIs

On Tue, Mar 13, 2012 at 06:16:39PM +0530, Ravi Kumar V wrote:
> On 3/13/2012 1:44 AM, Daniel Walker wrote:
> >On Mon, Mar 12, 2012 at 04:02:44PM +0530, Ravi Kumar V wrote:
> >>Add DMAEngine based driver using the old MSM DMA APIs internally.
> >
> >What do you mean by this?
> >
> There is a MSM DMA driver in arch/arm/mach-msm/ which is not in
> dmaengine framework standards, but that driver is been used by
> client drivers nand, eMMC and serial drivers. Now if we implement
> the whole dma driver using dmaengine framework then nand, eMMC like
> drivers will be failed as they are using old dma driver API's, so
> instead of implementing new driver from scratch we are keeping the
> old dma API's as it is and using those API's in new dmaengine
> framework.So that we can convert clients drivers to use dma engine
> framework.

Did you investigate converting the drivers (nand, eMMC, serial) ? It
seems like there would be a 1:1 mapping between the API's , so it might
only be a find->replace operation.

Daniel
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