[PATCH] spi: qup: Add DMA capabilities

On Thu, Jun 26, 2014 at 04:06:21PM -0500, Andy Gross wrote:

+	if (xfer->rx_buf) {
+		rx_dma = dma_map_single(controller->dev, xfer->rx_buf,
+			xfer->len, DMA_FROM_DEVICE);

It would be better to use the core DMA mapping code rather than open
coding.  This code won't work for vmalloc()ed addresses, or physically
non-contiguous addresses unless there's an IOMMU fixing things up.
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