linux-kernel - Re: [PATCH] arm64: dts: allwinner: a64: Add gpio bank supply for A64-Olinuxino

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Date:   Sat, 18 Jan 2020 15:27:32 +0100
From:   Emmanuel Vadot <manu@...ouilliste.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Emmanuel Vadot <manu@...ebsd.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: dts: allwinner: a64: Add gpio bank supply for
 A64-Olinuxino

On Fri, 17 Jan 2020 11:20:21 +0800
Chen-Yu Tsai <wens@...e.org> wrote:

> On Fri, Jan 17, 2020 at 3:47 AM Emmanuel Vadot <manu@...ebsd.org> wrote:
> >
> > Add the regulators for each bank on this boards.
> >
> > Signed-off-by: Emmanuel Vadot <manu@...ebsd.org>
> > ---
> >  .../boot/dts/allwinner/sun50i-a64-olinuxino.dts   | 15 +++++++++++++++
> >  1 file changed, 15 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
> > index 01a9a52edae4..1a25abf6065c 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
> > @@ -163,6 +163,17 @@ &ohci1 {
> >         status = "okay";
> >  };
> >
> > +&pio {
> > +       vcc-pa-supply = <&reg_dcdc1>;
> > +       vcc-pb-supply = <&reg_dcdc1>;
> > +       vcc-pc-supply = <&reg_dcdc1>;
> > +       vcc-pd-supply = <&reg_dcdc1>;
> > +       vcc-pe-supply = <&reg_aldo1>;
> > +       vcc-pf-supply = <&reg_dcdc1>;
> > +       vcc-pg-supply = <&reg_dldo4>;
> > +       vcc-ph-supply = <&reg_dcdc1>;
> > +};
> > +
> >  &r_rsb {
> >         status = "okay";
> >
> > @@ -175,6 +186,10 @@ axp803: pmic@3a3 {
> >         };
> >  };
> >
> > +&r_pio {
> > +       vcc-pl-supply = <&reg_aldo2>;
> 
> This is likely going to cause a circular dependency, because the RSB
> interface that is used to talk to the PMIC is also on the PL pins.

 Indeed that cause a Linux kernel to not boot at all.

> (How does FreeBSD deal with this?)

 We don't deal with vcc-X-supply until later in the boot, this is not
ideal but better than not dealing with them.

> Instead, just add a comment describing what is really used, and set
> the regulator to always-on, which should already be the case.

 Ok will do,

Thanks.

> ChenYu
> 
> > +};
> > +
> >  #include "axp803.dtsi"
> >
> >  &ac_power_supply {
> > --
> > 2.24.1
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Emmanuel Vadot <manu@...ouilliste.com> <manu@...ebsd.org>

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