kernel at martin.sperl.org writes:

From: Martin Sperl <redacted>

Add slave_sg support to bcm2835-dma using shared allocation
code for bcm2835_desc and DMA-control blocks already used by
dma_cyclic.

Note that bcm2835_dma_callback had to get modified to support
both modes of operation (cyclic and non-cyclic).

Tested using:
* Hifiberry I2S card (using cyclic DMA)
* fb_st7735r SPI-framebuffer (using slave_sg DMA via spi-bcm2835)
playing BigBuckBunny for audio and video.

Signed-off-by: Martin Sperl <redacted>

I would have expected bcm2835_dma_create_cb_chain()'s changes to support
slave DMA to be in this patch rather than the refactor patch.  However,
the content of this one and 8/8 are:

Reviewed-by: Eric Anholt <redacted>
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