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Date:   Thu, 7 Oct 2021 10:44:49 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     oder_chiou@...ltek.com, perex@...ex.cz, tiwai@...e.com,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        alsa-devel@...a-project.org, lkml <linux-kernel@...r.kernel.org>,
        cy_huang <cy_huang@...htek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, allen lin <allen_lin@...htek.com>
Subject: Re: [PATCH 1/2] ASoC: dt-bindings: rt9120: Add initial bindings

Hi,

ChiYuan Huang <u0084500@...il.com> 於 2021年10月6日 週三 下午4:47寫道:
>
> Hi, Mark:
> ChiYuan Huang <u0084500@...il.com> 於 2021年10月5日 週二 下午8:39寫道:
> >
> > Mark Brown <broonie@...nel.org> 於 2021年10月5日 週二 下午8:29寫道:
> > >
> > > On Tue, Oct 05, 2021 at 08:25:43PM +0800, ChiYuan Huang wrote:
> > > > Mark Brown <broonie@...nel.org> 於 2021年10月5日 週二 下午7:49寫道:
> > > > > On Tue, Oct 05, 2021 at 09:16:54AM +0800, cy_huang wrote:
> > >
> > > > > > +  richtek,use-dvdd-1p8v:
> > > > > > +    description: Indicate DVDD 1P8V is used, default for 3P3V or 5V design
> > > > > > +    type: boolean
> > >
> > > > > I would expect this to be done through the regulator bindings, they
> > > > > would allow the driver to query the supply voltage.
> > >
> > > > It's more like as the I/O pad voltage.
> > > > Must be the same as I2C and I2S signal high level.
> > > > It depends on the application SOC design.
> > > > From my understanding, not all application SOC I/O voltage uses
> > > > regulator interface.
> > >
> > > It doesn't really matter what the SoC is doing here, you can always add
> > > regulator support to your device - you'd be requesting the supplies to
> > > your device, if the SoC doesn't request the supplies that go to it that
> > > doesn't really make a difference to what your driver does.
> > >
> > > Please don't take things off-list unless there is a really strong reason
> > > to do so.  Sending things to the list ensures that everyone gets a
> > > chance to read and comment on things.
> >
> After contacting our HW RD, to support DVDD 1.8V not just SW config,
> also HW connections.
> To get only DVDD supply voltage is not enough to meet the HW design.
> The property seems indeed and need to be used by user's HW connection.
>
> Can this property to be kept?

After thinking, This property name may be improper.
I think this change depends on HW external circuit for lowv application.
Currently, I'm modifying the V3 change, this property name also affect
the property parsing code change.
May I directly change the name to 'richtek,dvdd-lowv-application' and
submit the patch v3?

Any comment is appreciated.
> > Sorry, my fault.
> > I just noticed the mail not reply all. Loop all again.

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