Re: [PATCH] ASoC: mediatek: mt6358: support DMIC one-wire mode

[Tzung-Bi Shih]

On Fri, May 29, 2020 at 9:05 PM Mark Brown <broonie@xxxxxxxxxx> wrote:
>
> On Fri, May 29, 2020 at 07:22:43PM +0800, Tzung-Bi Shih wrote:
> > On Fri, May 29, 2020 at 7:09 PM Mark Brown <broonie@xxxxxxxxxx> wrote:
>
> > > What is DMIC one wire mode?  This doesn't sound like something I'd
> > > expect to vary at runtime.
>
> > It means: 1 PDM data wire carries 2 channel data (rising edge for left
> > and falling edge for right).
>
> I thought that was normal for DMICs - is this selecting between left and
> right or something?

Not sure what is the common name but use the same context here.

MT6358 accepts up to 2 PDM wires for 2 DMICs.
If one wire mode is on, MT6358 only accepts 1 PDM wire.
If one wire mode is off, MT6358 merges L/R from 2 PDM wires into 1
I2S-like to SoC.