linux-kernel - Re: [PATCH 1/2] ARM: dts: pfuze3000: update sw1a/vldo4 voltage range

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Date:   Sat, 17 Mar 2018 11:53:08 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Robin Gong <yibin.gong@....com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        NXP Linux Team <Linux-imx@....com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: dts: pfuze3000: update sw1a/vldo4 voltage range

Hi Anson,

On Sat, Mar 17, 2018 at 3:57 AM, Anson Huang <Anson.Huang@....com> wrote:
> Update sw1a/vldo4's voltage range according to latest pfuze3000
> datasheet from:
>
> http://cache.freescale.com/files/analog/doc/data_sheet/PF3000.pdf?fsrch=1&sr=1&pageNum=1
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> Signed-off-by: Robin Gong <yibin.gong@....com>
> ---
>  arch/arm/boot/dts/imx6sx-udoo-neo.dtsi  | 2 +-
>  arch/arm/boot/dts/imx7d-cl-som-imx7.dts | 4 ++--
>  arch/arm/boot/dts/imx7d-nitrogen7.dts   | 2 +-
>  arch/arm/boot/dts/imx7d-sdb.dts         | 6 +++---
>  arch/arm/boot/dts/imx7s-warp.dts        | 2 +-
>  5 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi b/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi
> index 53b3eac..1de0a0f 100644
> --- a/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi
> +++ b/arch/arm/boot/dts/imx6sx-udoo-neo.dtsi
> @@ -142,7 +142,7 @@
>                 regulators {
>                         sw1a_reg: sw1a {
>                                 regulator-min-microvolt = <700000>;
> -                               regulator-max-microvolt = <1475000>;
> +                               regulator-max-microvolt = <3300000>;

This change does not look like a safe thing to do without carefully
checking each one of the board schematics.

Even if the regulator itself is capable of driving a higher voltage,
it does not mean that the circuitry that consumes such regulator is
allowed to receive the higher voltages.