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

[Lars-Peter Clausen]

On 01/07/2015 05:13 PM, Arnd Bergmann wrote:
> 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.

2 to 3 upstream releases. I have the code and it is working, but the 
migration path has a lot of inter dependencies between different frameworks, 
so it is going to take a while until all is upstream.

- Lars

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