On Thu, May 30, 2013 at 10:31 PM, Tony Lindgren [off-list ref] wrote:

There are many devices where the device FIFO is memory mapped to the
GPMC bus on omaps, like TUSB, OneNAND, smc911x etc. I believe the
only reason why these have not been converted to the dmaengine is
the fact that dmaengine cannot configure the DMA hardware to do
autoincrement and loop over the device FIFO.

OK that seems like something pretty generic that we could just add
to the struct dma_slave_config actually, something like:

u32 src_fifoloop;
u32 dst_fifoloop;

Given in # of words on the src/dst address simply, left as zero
for hitting a constant address over and over again.

We'd need both to make space for device->device transfers.

If this is all that is needed to convert them do DMAengine
I'd surely ACK it (FWIW).

Yours,
Linus Walleij