linux-kernel - Re: [linux-sunxi] [PATCH 2/4] ARM: dts: sun8i-a83t-tbs-a711: HM5065 doesn't like such a high voltage

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Date:   Sun, 23 Feb 2020 10:57:36 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     linux-sunxi <linux-sunxi@...glegroups.com>,
        Maxime Ripard <mripard@...nel.org>,
        Tomas Novotny <tomas@...otny.cz>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH 2/4] ARM: dts: sun8i-a83t-tbs-a711: HM5065
 doesn't like such a high voltage

Hello,

On Sun, Feb 23, 2020 at 11:39:17AM +0800, Chen-Yu Tsai wrote:
> On Sun, Feb 23, 2020 at 6:32 AM Ondrej Jirman <megous@...ous.com> wrote:
> >
> > Lowering the voltage solves the quick image degradation over time
> > (minutes), that was probably caused by overheating.
> >
> > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> 
> Makes sense. A lot of camera sensors run their digital parts off 1.8V.
> This one is no different.
> 
> Acked-by: Chen-Yu Tsai <wens@...e.org>
> 
> The whole CSI stuff isn't enabled in the device tree yet though, and
> there are a lot of regulators with CSI in their names. Will this get
> worked on?

Yes, I'm preparing support for both cameras in this branch:

  https://megous.com/git/linux/log/?h=cam-5.6

Both already work quite well. I'm just sending some fixes early.

Both cameras work best at 1.8V for the digital part.

regards,
	o.

> ChenYu
> 
> > ---
> >  arch/arm/boot/dts/sun8i-a83t-tbs-a711.dts | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/sun8i-a83t-tbs-a711.dts b/arch/arm/boot/dts/sun8i-a83t-tbs-a711.dts
> > index ee5ce3556b2ad..ae1fd2ee3bcce 100644
> > --- a/arch/arm/boot/dts/sun8i-a83t-tbs-a711.dts
> > +++ b/arch/arm/boot/dts/sun8i-a83t-tbs-a711.dts
> > @@ -371,8 +371,8 @@ &reg_dldo2 {
> >  };
> >
> >  &reg_dldo3 {
> > -       regulator-min-microvolt = <2800000>;
> > -       regulator-max-microvolt = <2800000>;
> > +       regulator-min-microvolt = <1800000>;
> > +       regulator-max-microvolt = <1800000>;
> >         regulator-name = "vdd-csi";
> >  };
> >
> > --
> > 2.25.1
> >
> > --
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