at91: dt: dma usage

[Arnd Bergmann]

On Wednesday 17 December 2014 21:16:22 Alexandre Belloni wrote:
> On 22/10/2014 at 10:53:43 +0200, Jiří Prchal wrote :
> > in fact that in at91sam chips has a lot of peripherals but only 2*8 dma channels
> > and as my patch in last week "at91: sam9x5 dt: add usart dma definitions to dt"
> > adds only dma definitions, not make to use them, leave it on board definition,
> > shouldn't do the same all other peripherals definitions?
> > I think that I2C, SPI are not as necessary as USART, but thous are always "on".
> 
> Not much discussion happened on that and I have the feeling this is
> something we have to sort out. Until the dma driver are able to allocate
> channels dynamically, it is true that this may be something we shouldn't
> enable in the dtsi and let people activate dma in the board dts.

Could you use the drivers/dma/virt-dma.c infrastructure in the driver
to do this? Are you already planning to use it?

	Arnd