linux-kernel - Re: [PATCH v5 2/2] arm64: dts: mediatek: enable i2c0 for mt8365-evk board

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Message-ID: <CAFGrd9pf+ojPDciF3Mtw-QT51LZCj+GNLHXurGx_vcC17GHA2A@mail.gmail.com>
Date:   Mon, 27 Mar 2023 12:56:36 +0200
From:   Alexandre Mergnat <amergnat@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Qii Wang <qii.wang@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Fabien Parent <fparent@...libre.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v5 2/2] arm64: dts: mediatek: enable i2c0 for mt8365-evk board

Hi Angelo,

Le lun. 27 mars 2023 à 10:45, AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> a écrit :
>
> Il 27/03/23 10:27, Alexandre Mergnat ha scritto:
> > Enable the I2C0 bus provides communication with:
> > - The integrated RT9466 Switching Battery Charger.
> > - The integrated MT6691 LP4X buck for VDDQ.
> > - The integrated MT6691 LP4X buck for VDD2.
> > - The pin header, to plug external I2C devices.
> >
> > Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>
> > ---
> >   arch/arm64/boot/dts/mediatek/mt8365-evk.dts | 16 ++++++++++++++++
> >   1 file changed, 16 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
> > index 4683704ea235..35cb142004a4 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
> > +++ b/arch/arm64/boot/dts/mediatek/mt8365-evk.dts
> > @@ -87,6 +87,13 @@ optee_reserved: optee@...00000 {
> >       };
> >   };
> >
> > +&i2c0 {
> > +     clock-frequency = <100000>;
> > +     pinctrl-0 = <&i2c0_pins>;
> > +     pinctrl-names = "default";
> > +     status = "okay";
> > +};
> > +
> >   &pio {
> >       gpio_keys: gpio-keys-pins {
> >               pins {
> > @@ -96,6 +103,15 @@ pins {
> >               };
> >       };
> >
> > +     i2c0_pins: i2c0-pins {
> > +             pins {
>                         pinmux = ...pins...
>                         bias-pull-up = <your-pull-up-adv-value>;
>                 };
>
> ...and please do *not* use the mediatek,pull-up-adv property: this is
> supposed to be there only for older devicetrees and there's a replacement
> for it.... unless you have any specific reason to do so (and if you do,
> you should well explain that).

bias-pull-up isn't necessary currently because MT8365 doesn't use MTK
paris/moore drivers.

> Besides, if you introduce the usage of that property in any 8365 devicetree,
> the previously proposed 8365 pinctrl cleanup will become a bit harder to do.

I'm thinking of deprecating the "mediatek,pull-up-adv",
"mediatek,pull-down-adv" properties from mt8365 pinctrl binding too.

Regards,
Alex