linux-kernel - Re: [PATCH 6/6] ARM: dts: sun8i: raise the max voltage of DCDC2 in sun8i reference tablets

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Message-ID: <20161213191459.mmoejcmf26qqtyze@lukather>
Date:   Tue, 13 Dec 2016 20:14:59 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Russell King <linux@...linux.org.uk>, Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Jorik Jonker <jorik@...pendief.biz>,
        Hans de Goede <hdegoede@...hat.com>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 6/6] ARM: dts: sun8i: raise the max voltage of DCDC2 in
 sun8i reference tablets

On Tue, Dec 13, 2016 at 11:22:52PM +0800, Icenowy Zheng wrote:
> The "extremity_freq" frequency described in the original FEX files uses
> a voltage of 1.46v, which is beyond the current maximum voltage value of
> DCDC2 (Cortex-A7 supply) in the sun8i reference tablet DTSI file.
> 
> Raise the maximum value to 1.46v.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
> ---
>  arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
> index 7ac8bb4bc95a..325ca5bd67a5 100644
> --- a/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
> +++ b/arch/arm/boot/dts/sun8i-reference-design-tablet.dtsi
> @@ -180,7 +180,7 @@
>  &reg_dcdc2 {
>  	regulator-always-on;
>  	regulator-min-microvolt = <900000>;
> -	regulator-max-microvolt = <1400000>;
> +	regulator-max-microvolt = <1460000>;

This is outside of the voltage range tolerated by the CPU. NAK.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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