linux-kernel - Re: [PATCH] arm64: dts: imx8mq-librem5-devkit: Use 0.9V for VDD

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Message-ID: <4cd156bb-ada6-7638-86ce-10b8e69b47a2@posteo.de>
Date:   Mon, 23 Mar 2020 20:17:56 +0100
From:   Martin Kepplinger <martink@...teo.de>
To:     Guido Günther <agx@...xcpu.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "Angus Ainslie (Purism)" <angus@...ea.ca>,
        Abel Vesa <abel.vesa@....com>,
        Anson Huang <Anson.Huang@....com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mq-librem5-devkit: Use 0.9V for VDD_GPU

On 19.03.20 17:46, Guido Günther wrote:
> According to the imx8mq data sheet running VDD_GPU at 0.9V is enough
> when not overclocking to 1GHz (which we currently don't do).
> 
> Signed-off-by: Guido Günther <agx@...xcpu.org>
> ---
>  arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> index c47a26cf8e43..736b250bc9c2 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts
> @@ -318,7 +318,7 @@
>  				regulator-min-microvolt = <700000>;
>  				regulator-max-microvolt = <1300000>;
>  				regulator-always-on;
> -				rohm,dvs-run-voltage = <1000000>;
> +				rohm,dvs-run-voltage = <900000>;
>  			};
>  
>  			buck4_reg: BUCK4 {
> 


since I'm running this now:

Tested-by: Martin Kepplinger <martin.kepplinger@...i.sm>

thanks