From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sergei Shtylyov <sshtylyov@mvista.com>
Subject: Re: [PATCH v7 01/10] ARM: davinci: move private EDMA API to arm/common
Date: Sat, 02 Feb 2013 04:01:37 +0400
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To: Matt Porter <mporter@ti.com>
Cc: Tony Lindgren <tony@atomide.com>, Linux DaVinci Kernel List <davinci-linux-open-source@linux.davincidsp.com>, Linux OMAP List <linux-omap@vger.kernel.org>, Russell King <linux@arm.linux.org.uk>, "Cousson, Benoit" <b-cousson@ti.com>, Arnd Bergmann <arnd@arndb.de>, Linux Documentation List <linux-doc@vger.kernel.org>, Vinod Koul <vinod.koul@intel.com>, Linux MMC List <linux-mmc@vger.kernel.org>, Devicetree Discuss <devicetree-discuss@lists.ozlabs.org>, Mark Brown <broonie@opensource.wolfsonmicro.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Rob Herring <rob.herring@calxeda.com>, Grant Likely <grant.likely@secretlab.ca>, Rob Landley <rob@landley.net>, Dan Williams <djbw@fb.com>, Linux SPI Devel List <spi-devel-general@lists.sourceforge.net>, Chris Ball <cjb@laptop.org>, Linux ARM Kernel List <linux-arm-kernel@lists.infradead.org>
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Hello.

On 01-02-2013 22:59, Matt Porter wrote:

>>>>> Move mach-davinci/dma.c to common/edma.c so it can be used
>>>>> by OMAP (specifically AM33xx) as well.

>>>> I think this should rather go to drivers/dma/?

>>> No, this is the private EDMA API. It's the analogous thing to
>>> the private OMAP dma API that is in plat-omap/dma.c. The actual
>>> dmaengine driver is in drivers/dma/edma.c as a wrapper around
>>> this...same way OMAP DMA engine conversion is being done.

>>    Keeps me wondering why we couldn't have the same with CPPI 4.1 when I proposed
>> that, instead of waiting indefinitely for TI to convert it to drivers/dma/
>> directly. We could have working MUSB DMA on OMAP-L1x/Sitara all this time... Sigh.

> That is a shame. Yeah, I've pointed out that I was doing this exactly
> the same way as was acceptable for the OMAP DMA conversion since it was
> in RFC. The reasons are sound since in both cases, we have many drivers
> to convert that need to continue using the private DMA APIs.

    In case of CPPI 4.1, we'd only have to convert MUSB DMA driver. Other 
in-tree CPPI 4.1 having SoCs don't use it for anything but MUSB -- it even is 
sub-block of their MUSB device, AFAIK (I maybe wrong about Sitaras -- I don't 
know them well).

> -Matt

WBR, Sergei