linux-kernel - Re: [PATCH 1/4] arm64: dts: allwinner: h6: orangepi: Add CPU supply regulator

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Date:   Thu, 14 Feb 2019 14:46:17 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     wens@...e.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] arm64: dts: allwinner: h6: orangepi: Add CPU supply
 regulator

Hi!

Thanks for your patches

On Thu, Feb 14, 2019 at 08:09:07AM -0500, Yangtao Li wrote:
> The original orangepi use the dcdca to supply the CPU cores. According
> to the axp805 spec, the range of dcdca is 0.6 to 1.1v, 1.12 to 1.52v.
> In order to support more CPU frequency, slightly increase the voltage
> maximum and minimum.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
> index b2526dac2fcf..e7aebaf91ede 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
> @@ -159,8 +159,8 @@
>  
>  			reg_dcdca: dcdca {
>  				regulator-always-on;
> -				regulator-min-microvolt = <810000>;
> -				regulator-max-microvolt = <1080000>;
> +				regulator-min-microvolt = <800000>;
> +				regulator-max-microvolt = <1160000>;

This violates the minimum and maximum recommended voltages in the H6
datasheet. Could you clarify why you are doing so (ideally in the
commit log)?

Thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com