linux-kernel - Re: [PATCH v5 10/10] arm64: dts: actions: Add uSD support for Cubieboard7

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Date:   Mon, 13 Jul 2020 00:15:28 +0530
From:   Amit Tomer <amittomer25@...il.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Andre Przywara <andre.przywara@....com>,
        Andreas Färber <afaerber@...e.de>,
        Rob Herring <robh+dt@...nel.org>, cristian.ciocaltea@...il.com,
        linux-kernel@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-actions@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 10/10] arm64: dts: actions: Add uSD support for Cubieboard7

Hi,

On Sun, Jul 12, 2020 at 11:00 PM Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
>
> On Thu, Jul 02, 2020 at 08:22:56PM +0530, Amit Singh Tomar wrote:
> > This commit adds uSD support for Cubieboard7 board based on Actions Semi
> > S700 SoC. SD0 is connected to uSD slot. Since there is no PMIC support
> > added yet, fixed regulator has been used as a regulator node.
> >
> > Signed-off-by: Amit Singh Tomar <amittomer25@...il.com>
> > ---
> > Changes since v4:
> >       * No change.
> > Changes since v3:
> >         * No change.
> > Changes since v2:
> >         * No change.
> > Changes since v1:
> >         * No change.
> > Changes since RFC:
> >         * No change.
> > ---
> >  arch/arm64/boot/dts/actions/s700-cubieboard7.dts | 41 ++++++++++++++++++++++++
> >  arch/arm64/boot/dts/actions/s700.dtsi            |  1 +
> >  2 files changed, 42 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/actions/s700-cubieboard7.dts b/arch/arm64/boot/dts/actions/s700-cubieboard7.dts
> > index 63e375cd9eb4..ec117eb12f3a 100644
> > --- a/arch/arm64/boot/dts/actions/s700-cubieboard7.dts
> > +++ b/arch/arm64/boot/dts/actions/s700-cubieboard7.dts
> > @@ -13,6 +13,7 @@
> >
> >       aliases {
> >               serial3 = &uart3;
> > +             mmc0 = &mmc0;
> >       };
> >
> >       chosen {
> > @@ -28,6 +29,23 @@
> >               device_type = "memory";
> >               reg = <0x1 0xe0000000 0x0 0x0>;
> >       };
> > +
> > +     /* Fixed regulator used in the absence of PMIC */
> > +     vcc_3v1: vcc-3v1 {
> > +             compatible = "regulator-fixed";
> > +             regulator-name = "fixed-3.1V";
> > +             regulator-min-microvolt = <3100000>;
> > +             regulator-max-microvolt = <3100000>;
> > +     };
>
> Is this regulator used somewhere?

This is something I copied from bubblegum dts as I wasn't sure what is right way
to include these regulators.

Also, another day tested it without having these regulators in , and
still it seems to
work.  So should these be removed ?

Thanks
-Amit