linux-kernel - Re: [PATCH v2 2/4] ASoC: dt-bindings: realtek, rt5682s: Add AVDD and MICVDD supplies

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Message-ID: <CAGXv+5EZO0+Af-Fmz8JW0SiV+b5He8ZSrinJ3TtaCP0vEoW1Mg@mail.gmail.com>
Date:   Thu, 27 Oct 2022 11:11:08 -0700
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org, Derek Fang <derek.fang@...ltek.com>,
        kernel@...labora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v2 2/4] ASoC: dt-bindings: realtek, rt5682s: Add AVDD and
 MICVDD supplies

On Thu, Oct 27, 2022 at 10:48 AM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> On Thu, Oct 27, 2022 at 7:36 AM Nícolas F. R. A. Prado
> <nfraprado@...labora.com> wrote:
> >
> > On Tue, Oct 25, 2022 at 01:12:49PM -0700, Chen-Yu Tsai wrote:
> > > On Mon, Oct 24, 2022 at 3:01 PM Nícolas F. R. A. Prado
> > > <nfraprado@...labora.com> wrote:
> > > >
> > > > The rt5682s codec can have two supplies: AVDD and MICVDD. They are
> > >
> > > The actual chip also has LDO1_IN (for digital core and charge pump)
> > > and DBVDD (for I/O). However in the Chromebook designs these two
> > > and AVDD are all provided from the same power rail, through separate
> > > filter banks.
> >
> > What about rt5682 (no s), does that chip also have these same supplies?

(Missed this question)

The RT5682 has the same supplies, plus the VBAT one.

ChenYu

> > Also, since you already gave the purpose of these other supplies, could you also
> > tell the purpose of AVDD, MICVDD and (for rt5682) VBAT? That way I could add
> > some description for them in the binding.
>
> As Mark mentioned in his reply, these are quite standard names.
>
> AVDD is for the analog bits. MICVDD is for the microphone bias.
> VBAT is called battery power in the datasheet. The block diagram
> shows it going through an internal controllable LDO whose output
> then powers MICVDD. This could be used in designs that don't
> include a suitable external supply for MICVDD. If MICVDD is provided,
> then one would turn the internal LDO off.
>
> So either VBAT or MICVDD has to be provided.
>
> ChenYu
>
> > Thanks,
> > Nícolas
> >
> > >
> > > Neither does the datasheet specify the ordering of AVDD, DBVDD, and
> > > LDO1_IN for power sequencing, just that three should be toggled together.
> > >
> > > Should we model these? Or wait until some design actually splits these?
> > [..]