[PATCH v2] dmaengine: bcm2835: Add slave dma support

[Martin Sperl]

I did tests with the (almost) finished dma-support of spi-bcm2835
against a TFT device and it work fine there.

Upstreaming this spi-bcm2835 patch obviously requires that the DMA
support is in the dma-engine driver first...

Please also see prior note about unnecessary interrupts when none
are requested for possible improvements.

> On 18.04.2015, at 13:06, Noralf Trønnes <noralf at tronnes.org> wrote:
> 
> Add slave transfer capability to BCM2835 dmaengine driver.
> This patch is pulled from the bcm2708-dmaengine driver in the
> Raspberry Pi repo. The work was done by Gellert Weisz.
> 
> Tested using the bcm2835-mmc driver from the same repo.
> 
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>

Tested-by: Martin Sperl <kernel at martin.sperl.org>