The pcm179x family supports both SPI and I2C for configuration. This
patch splits the driver into core and SPI parts, in preparation for
I2C support.
Signed-off-by: NJacob Siverskog <jacob@teenage.engineering>
Reviewed-by: NJohan Hovold <johan@kernel.org>
Acked-by: NMichael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: NMark Brown <broonie@kernel.org>