[alsa-devel] Porting codec driver to DT

[Andreas Irestål]

Hi!

We're using the adau17x1 codecs in our products. They currently rely on
platform_data to provide information such as mic bias voltage, jack
detection and a few other hardware-specific parameters. As we want to
move to DT while still having support for the old platform_data way of
providing HW-specific information, this makes things a bit more complicated.

There are a few enums declared in <linux/platform_data/adau17x1.h> which
are used by the codec driver to distunguish between different
configurations. I'd like to use/provide these values in my .dts-file as well,
but that would mean either duplicating the definitions, or including
DT-specific parts in platform_data or vice versa. What would the Proper
(TM) way of implementing support for both be? I've peeked on other
drivers but it hasn't helped a lot.

At the moment I'm considering the solution of having a second set of
definitions in the DT path with slightly different names, and then
change the codec driver to use these definitions instead. If platform_data is
provided, there'll be some translation logic at probing time.

Any suggestions?
/Andreas