[PATCH 1/8] soundwire: bus_type: add master_device/driver support

[Pierre-Louis Bossart]

> As you are adding new sysfs files here, is there a follow-on patch for
> Documentation/ABI/ updates?

Yes that's the plan. The original patches for sysfs were submitted as an 
RFC:

https://mailman.alsa-project.org/pipermail/alsa-devel/2019-May/148699.html

Most of the sysfs entries would mirror the value of _DSD properties, but 
that's still very useful to check platform integration issues. Some of 
the DSDT blocks are overwritten at run-time depending on BIOS menu 
selections, so it's impossible to figure out what the firmware exposes 
to the OS just by looking at the DSDT contents extracted with acpica tools.