regmap should handle any byte ordering issues required, it is looking for
a byte stream from the bus, so don't set 16 bits per word. This is likely
to have tested out OK due to use of an unmerged SPI controller driver.
Signed-off-by: NMark Brown <broonie@linaro.org>
Tested-by: NMax Filippov <jcmvbkbc@gmail.com>

tlv320aic23 chip control interface may work in either I2C or SPI mode
depending on the MODE pin state. Functionality and register layout are
independent of the control mode.

Implement bus-specific parts as separate modules.
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NMark Brown <broonie@linaro.org>