linux-kernel - Re: [linux-sunxi] [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications

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Date:	Sun, 09 Aug 2015 23:58:55 +0100
From:	Iain Paton <ipaton0@...il.com>
To:	public_timo.s@...entcreek.de
CC:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, maxime.ripard@...e-electrons.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
	wens@...e.org
Subject: Re: [linux-sunxi] [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage
 for sun7i-a20 to meet SoC specifications

Acked-by: Iain Paton <ipaton0@...il.com>

On 04/08/15 22:08, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains a cpufreq operating point at 0.9 volts. The minimum
> CPU voltage for the Allwinner A20 SoC, however, is 1.0 volts. Thus, raise
> the voltage for the lowest operating point to 1.0 volts in order to stay
> within the SoC specifications. It is an undervolted setting that isn't
> stable across all SoCs and boards out there.
> 
> Signed-off-by: Timo Sigurdsson <public_timo.s@...entcreek.de>
> ---
> Changes since v1:
> 
> - Fixed checkpatch warnings
> - Changed the commit message and title to clarify that this is not a board-specific issue, but rather a limitation by the SoC  
> ---
>  arch/arm/boot/dts/sun7i-a20.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> index 6a63f30..f5f384c 100644
> --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> @@ -107,7 +107,7 @@
>  				720000	1200000
>  				528000	1100000
>  				312000	1000000
> -				144000	900000
> +				144000	1000000
>  				>;
>  			#cooling-cells = <2>;
>  			cooling-min-level = <0>;
> 

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