This driver is used by SIRF internal audio codec.
Use dedicated SiRF audio port TXFIFO and RXFIFO
Supports two DMA channels for SiRF audio port TXFIFO and RXFIFO
The audio port like as audio bus such as i2s.
Signed-off-by: NRongjun Ying <rongjun.ying@csr.com>
Signed-off-by: NMark Brown <broonie@linaro.org>