>>>>> While the hardware supports PDM streams, this capability has never >>>>> been tested or enabled on any product, so this is dead-code. Let's >>>>> remove all this. >>>> >>>> So no plans to test and enable this? Do the DMICs not use PDM? >>> >>> The point is that this code is unused/untested. We can re-add it after >>> it was tested. >> >> That does not answer my question. Do the DMICs not use PDM? > > I will leave the question to Pierre. 😊 traditional digital microphones using the Nokia spec with two microphones using opposite clock edges do use PDM. PDM over SoundWire is possible as well, it's e.g. used by Qualcomm for amplifiers. This patch does not make a statement on whether PDM support makes sense or not in general. As mentioned above on Intel platforms the hardware is in theory capable of supporting PDM, but that capability has never been deployed, all existing devices we connect to are PCM based and all the PDM references are essentially untested - and likely broken.
