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

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Message-ID: <20200529181606.GU4610@sirena.org.uk>
Date:   Fri, 29 May 2020 19:16:06 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Tzung-Bi Shih <tzungbi@...gle.com>
Cc:     Jiaxin Yu <jiaxin.yu@...iatek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hariprasad Kelam <hariprasad.kelam@...il.com>,
        ALSA development <alsa-devel@...a-project.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        howie.huang@...iatek.com
Subject: Re: [PATCH] ASoC: mediatek: mt6358: support DMIC one-wire mode

On Sat, May 30, 2020 at 01:26:20AM +0800, Tzung-Bi Shih wrote:
> On Fri, May 29, 2020 at 9:05 PM Mark Brown <broonie@...nel.org> wrote:

> > 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.

Oh, interesting - so it's essentially a mixer?  Not seen that before but
makes sense.  In any case this definitely seems like a good fit for a DT
property.

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