Implement the ->apply() hook and drop the ->enable(), ->disable,
->set_polarity and ->config() ones.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: NNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>