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 11:39:17 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Ondřej Jirman <megous@...ous.com>
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

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?

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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