The patch is to make driver with flexibility for more platforms support even if
the internal design is just one ADC. Besides, many I2S controllers only support
2 channels.
Signed-off-by: David Lin <CTLIN0@nuvoton.com>
Link: https://lore.kernel.org/r/20220708054647.540621-1-CTLIN0@nuvoton.comSigned-off-by: Mark Brown <broonie@kernel.org>