From mboxrd@z Thu Jan 1 00:00:00 1970 From: Iain Paton Subject: Re: [PATCH v2] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to meet SoC specifications Date: Sun, 09 Aug 2015 23:58:55 +0100 Message-ID: <55C7DB2F.5080907@gmail.com> References: <1438722481-2302-1-git-send-email-public_timo.s@silentcreek.de> Reply-To: ipaton0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <1438722481-2302-1-git-send-email-public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org, maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, wens-jdAy2FN1RRM@public.gmane.org List-Id: devicetree@vger.kernel.org Acked-by: Iain Paton 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 > --- > 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>; >