linux-kernel - RE: [PATCH] dma: xilinx-dma: move header file to common location

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Date:	Thu, 5 Mar 2015 09:34:23 +0000
From:	Appana Durga Kedareswara Rao <appana.durga.rao@...inx.com>
To:	Vinod Koul <vinod.koul@...el.com>, Arnd Bergmann <arnd@...db.de>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	Michal Simek <michals@...inx.com>,
	"Soren Brinkmann" <sorenb@...inx.com>,
	Srikanth Vemula <svemula@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Anirudha Sarangi" <anirudh@...inx.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Subject: RE: [PATCH] dma: xilinx-dma: move header file to common location

Hi Arnd,

> -----Original Message-----
> From: Vinod Koul [mailto:vinod.koul@...el.com]
> Sent: Wednesday, March 04, 2015 5:33 PM
> To: Arnd Bergmann
> Cc: linux-arm-kernel@...ts.infradead.org; Appana Durga Kedareswara Rao;
> dan.j.williams@...el.com; Michal Simek; Soren Brinkmann; Srikanth Vemula;
> linux-kernel@...r.kernel.org; Anirudha Sarangi;
> dmaengine@...r.kernel.org; Appana Durga Kedareswara Rao
> Subject: Re: [PATCH] dma: xilinx-dma: move header file to common location
>
> On Mon, Mar 02, 2015 at 08:28:01PM +0100, Arnd Bergmann wrote:
> > On Monday 02 March 2015 23:24:24 Kedareswara rao Appana wrote:
> > > This patch moves the xilinx_dma.h header file to the
> > > include/linux/dma.
> > >
> > > Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> >
> > Please move this header file to drivers/dma/xilinx/ directly to make
> > it inaccessible by other driver. No driver should pass extra data
> > structures to a dmaengine driver.
> Actually that is not true. Few of the drivers need some additional parameters
> to be set which are not covered by the common set, hence an additional API
> is exposed by this driver to do so...
>
> If ever we could get rid of these...

As I said earlier in the below thread.
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-January/317705.html

Some DMA IP's have a specific features which is not supported by the DMA engine framework.
For those DMA IP's as suggested by Lars (http://www.spinics.net/lists/dmaengine/msg00010.html )
We are exporting that functionality and that functionality may needed by some other IP's that's why the header file should be in common location.

Please let me know if my explanation is not clear to you.

@Vinod: Thanks for the comment. Any functional comments for this patch?

Regards
Kedar.

>
> --
> ~Vinod

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