[RESEND] spi: davinci: Allow device tree devices to use DMA

[Mark Brown]

On Thu, Jan 12, 2017 at 01:34:10PM -0800, Kevin Hilman wrote:

> I thinks this driver needs an update to use spi_map_buf() to be able to
> handle vmalloc'd buffers before always enabling DMA.

Right.  As I said elsewhere in the thread the driver looks like it needs
some very serious TLC based on a quick scan through.
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