linux-kernel - Re: [PATCH 4/4] ASoC: wm8904: add DMIC support

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Message-ID: <AM6PR08MB4376C690036C5558058C4F16FFB09@AM6PR08MB4376.eurprd08.prod.outlook.com>
Date:   Mon, 20 Jun 2022 15:03:50 +0000
From:   Pierluigi Passaro <pierluigi.p@...iscite.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Alifer Willians de Moraes <alifer.m@...iscite.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Eran Matityahu <eran.m@...iscite.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "nicoleotsuka@...il.com" <nicoleotsuka@...il.com>,
        "patches@...nsource.cirrus.com" <patches@...nsource.cirrus.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shengjiu.wang@...il.com" <shengjiu.wang@...il.com>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>
Subject: Re: [PATCH 4/4] ASoC: wm8904: add DMIC support

> > > > +static const char *cin_text[] = {
> > > > +     "ADC", "DMIC"
> > > > +};

> > > > +static SOC_ENUM_SINGLE_DECL(cin_enum,
> > > > +                         WM8904_DIGITAL_MICROPHONE_0, 12, cin_text);

> > > Why would this be runtime selectable?  I'd expect the decision to use
> > > an analogue or digital microphone to be made in the hardware design.

> > I agree that dedicated HW is required, but currently SW side there's no support at all.
> > This patch is aiming to provide a way to enable DMIC on boards using it.
> > Is this supposed to be managed in a different way ?

> Via firmware description.

Can you please provide any reference approach in the kernel code ?