linux-kernel - Re: [PATCH] dmaengine: add CSR SiRFprimaII DMAC driver

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Date:	Wed, 14 Sep 2011 10:24:17 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Barry Song <21cnbao@...il.com>,
	linux-kernel@...r.kernel.org, workgroup.linux@....com,
	Rongjun Ying <rongjun.ying@....com>,
	Barry Song <Baohua.Song@....com>, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dmaengine: add CSR SiRFprimaII DMAC driver

On Sun, 2011-09-11 at 23:27 +0200, Linus Walleij wrote:
> On Thu, Sep 8, 2011 at 11:38 PM, Vinod Koul <vkoul@...radead.org> wrote:
> >
> > Linus W, any progress on that patches you posted??
> 
> I haven't written any, and I felt the whole issue was pretty inflamed
> too so I felt bad about it and avoided to think about it even since
> I have no real problem with this in my current setups.
> 
> Currently there is a strong coupling between platforms and filter
> functions and I can live with it in the systems I use since they have
> just one DMAC and need only one filter function per device,
> that is specified in platform data for the device. This would likely
> also work for the SiRFprimaII if it has only a single DMAC.
> The people facing an immediate issue with this are IIRC the
> Samsung S5Ps.
> 
> If you think this is in need of solving soon and want me to propose
> patches for channel mapping to devices using the approach used in
> clkdev and regulator APIs to create an attributed mapping table
> using struct device * or its string representations, I can
> try it out of course, but if it gets flamy I will just back off again.
Please try at my request. I really would like this problem to be solved.

What we want is API which solves filter function issues (we should be
able to completely do away after proper mapping). Making a simple to
understand/code/maintain scheme which is platform independent.


-- 
~Vinod

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