Add the bindings and the related documentation for the audio hdmitx
control glue of the Amlogic g12a SoC family
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Tested-by: NNeil Armstrong <narmstrong@baylibre.com>
Tested-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NMark Brown <broonie@kernel.org>