linux-kernel - Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA

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Date:	Mon, 24 Jun 2013 16:53:40 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Joel A Fernandes <agnel.joel@...il.com>
CC:	Arnd Bergmann <arnd@...db.de>, Joel A Fernandes <joelagnel@...com>,
	Tony Lindgren <tony@...mide.com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Koen Kooi <koen@...gleboard.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>
Subject: Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA

On 6/22/2013 3:23 AM, Joel A Fernandes wrote:
> Hi Arnd,
> 
> On Fri, Jun 21, 2013 at 1:44 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> On Friday 21 June 2013, Joel A Fernandes wrote:
>>> I think we are talking about different things, I agree the 'select
>>> DMADEVICES' can be dropped but lets please keep the default y option
>>> (not adding new select statements, just saying that if someone select
>>> DMADEVICES in menuconfig and if they're ARCH_OMAP=1 , then default to
>>> EDMA). This will simply allow people to have a default. Thanks.
>>
>> Yes, that's ok.
> 
> Ok, thanks. I will follow up with a patch in my next submissions that builds it.
> 
> Perhaps a:
> default y if 'ARCH_OMAP2PLUS'
> 
> and leave the existing as it is...
> default n if  'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2'
> 
> would make most sense to me. Basically EDMA is seen on current and all
> new OMAP2PLUS.

OMAP2PLUS devices like OMAP3/4 do not have EDMA so this is not really true.

> 
>>
>> config TI_EDMA
>>         tristate "TI EDMA support"
>>         default m if 'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2
>>         select DMA_ENGINE
>>         select DMA_VIRTUAL_CHANNELS
> 
> 
> 
> MMC depends on EDMA specially on AM33xx there's no PIO mode AFAIK. The
> 'm' option will require some initramfs to load the module when needing
> to MMC boot, I suggest lets leave it as y.

But there is no reason why it cannot work with PIO, right? Sounds like
the right fix is in driver.

Thanks,
Sekhar
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