linux-kernel - Re: [PATCH v2 1/2] ARM: imx: Add the secondary request into the structure for imx-sdma

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Date:	Thu, 24 Jul 2014 21:30:04 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Nicolin Chen <nicoleotsuka@...il.com>
CC:	<broonie@...nel.org>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <rdunlap@...radead.org>,
	<lgirdwood@...il.com>, <perex@...ex.cz>, <tiwai@...e.de>,
	<timur@...i.org>, <grant.likely@...aro.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<alsa-devel@...a-project.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<b02247@...escale.com>, <b42378@...escale.com>
Subject: Re: [PATCH v2 1/2] ARM: imx: Add the secondary request into the
 structure for imx-sdma

On Thu, Jul 24, 2014 at 04:35:28PM +0800, Nicolin Chen wrote:
> SDMA supports device to device (per_2_per) scripts to handle DMA transfering
> between two peripheral devices. The per_2_per script, however, needs two dma
> requests from two sides while the current structure only defined one request.
> 
> So this patch just simply adds the secondary request so as to let SDMA and
> its user to add its implementation later.
> 
> [ Both change in the SDMA driver and its users like Freescale ASRC ASoC driver
>   should be taken along with this change in order to truly support per_2_per
>   sciprts. However, we here make an expediency by adding this first so that
>   we can add either side later since this patch won't break any function and
>   meanwhile it can make merge window more smoothly: we don't need to apply the
>   change inside dmaengine branch via ASoC tree any more. -- Nicolin ]
> 
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>

Acked-by: Shawn Guo <shawn.guo@...aro.org>
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