linux-kernel - RE: [PATCH 1/5] dmaengine: add ep93xx DMA support

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Message-ID: <0D753D10438DA54287A00B027084269764D3319EC4@AUSP01VMBX24.collaborationhost.net>
Date:	Thu, 26 May 2011 13:48:12 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Mika Westerberg <mika.westerberg@....fi>,
	Linus Walleij <linus.walleij@...aro.org>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Vinod Koul <vinod.koul@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ryan@...ewatersys.com" <ryan@...ewatersys.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	spi mailing list <spi-devel-general@...ts.sourceforge.net>
Subject: RE: [PATCH 1/5] dmaengine: add ep93xx DMA support

On Thursday, May 26, 2011 11:38 AM, Mika Westerberg wrote:
> On Thu, May 26, 2011 at 09:15:25AM +0200, Linus Walleij wrote:
>> On Thu, May 26, 2011 at 6:33 AM, Mika Westerberg <mika.westerberg@....fi> wrote:
>> 
>>> Do you think that we can go forward with this patch series if I drop the last
>>> patch (spi/ep93xx: add DMA support)? This way we will have dmaengine
>>> implementation in place, whatever SPI driver we choose to use with ep93xx.
>> 
>> Yes and you don't have to drop any DMA support for the existing driver
>> for me alone, now that it's in the tree it should be maintained. I only
>> wanted to raise the issue of code duplication, not block any patches.
>
> Ok, so I'll keep the last patch for now.
>
> BTW: if we get amba-pl022 driver to work with ep93xx, do you have any ideas
> how to proceed from there? I mean, should we convert existing users to use
> that driver instead and finally remove the ep93xx_spi driver?

I think the biggest hurdle with using the amba-pl022 driver is that the ep93xx
spi peripheral does not have the registers with the pid and cid id's.  Without
those I don't think the amba bus driver will be able to match the device to
the driver.

Regards,
Hartley
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