linux-kernel - Re: [PATCH, RFC] MIPS: jz4740: use dma filter function

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Message-ID: <10623722.YrKe6DgiSS@wuerfel>
Date:	Wed, 07 Jan 2015 17:13:44 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	linux-kernel@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
	dmaengine@...r.kernel.org, alsa-devel@...a-project.org,
	linux-mmc@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH, RFC] MIPS: jz4740: use dma filter function

On Wednesday 07 January 2015 15:29:36 Lars-Peter Clausen wrote:
> On 01/06/2015 02:48 PM, Arnd Bergmann wrote:
> > On Tuesday 06 January 2015 11:45:58 Lars-Peter Clausen wrote:
> >> On 01/05/2015 11:39 PM, Arnd Bergmann wrote:
> >>> As discussed on the topic of shmobile DMA today, jz4740 is the only
> >>> user of the slave_id field in dma_slave_config besides shmobile. This
> >>> use is really incompatible with the way that other drivers use the
> >>> dmaengine API, so we should get rid of it.
> >>
> >> Do you have a link to that discussion?
> >
> > http://www.spinics.net/lists/linux-mmc/msg30069.html
> 
> I'm really not comfortable with this patch, since it is a step back. But I 
> guess the end justify the means. So if it helps to get rid of slave_id I'm 
> ok with it, sooner or later jz4740 will be converted to DT so once that's 
> done the filter function can be removed again. But please put the filter 
> function in a non arch specific header so we can still compile test things. 
> And maybe note in the commit message that this is meant as a temporary hack.
> 

Do you have a timeline for DT support? Maybe it's easier to just
wait for the problem to solve itself.

	Arnd
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