This patch adds Cygnus audio DMA driver. It supports playback
and capture modes and uses ringbuffers for data transfer.
Signed-off-by: NLori Hikichi <lhikichi@broadcom.com>
Signed-off-by: NSimran Rai <ssimran@broadcom.com>
Reviewed-by: NRay Jui <rjui@broadcom.com>
Reviewed-by: NArun Parameswaran <arunp@broadcom.com>
Reviewed-by: NScott Branden <sbranden@broadcom.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

This driver adds support for digital audio (I2S)
for the BCM2835 SoC that is used by the
Raspberry Pi. External audio codecs can be
connected to the Raspberry Pi via P5 header.

It relies on cyclic DMA engine support for BCM2835.
Signed-off-by: NFlorian Meier <florian.meier@koalo.de>
Signed-off-by: NMark Brown <broonie@linaro.org>