Re: [PATCH v7 2/4] dmaengine: Forward slave device pointer to of_xlate callback

[Marek Szyprowski]

Hi Ulf,

On 2017-02-09 10:55, Ulf Hansson wrote:
> > > Yes agreed on that, plus the runtime handling needs to be built in, right
> > > now the APIs dont work well with it, we disucssed these during the KS and
> > > this goes without saying, patches are welcome :)
> > Okay, so what is the conclusion? Do you want me to do the whole rework of
> > dma
> > engine core to get this runtime pm patchset for pl330 merged??? Is there any
> > roadmap for this rework prepared, so I can at least take a look at the
> > amount
> > of work needed to be done?
> >
> > I'm rather new to dma engine framework and I only wanted to fix pl330 driver
> > not to block turning off the power domain on Exynos5422/5433 SoCs.
> As you probably know, this is a common problem for many dma devices,
> slave devices and platforms.

Right, this is a common issue and someone has to finally find a solution 
for it.

> If possible, it would be great if we could avoid a solution that
> doesn't force changes to lots of "dma consumer" drivers.

My current solution doesn't require changing ANY "dma consumer" driver. 
However,
I have one more idea how to avoid touching dma engine ("provider") 
drivers as
well. This will also address some issues pointed by Lars.

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland