linux-kernel - Re: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply

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Date:	Mon, 3 Aug 2015 11:13:00 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Timo Sigurdsson <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, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com, wens@...e.org
Subject: Re: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20
 to a level all boards can supply

On Sun, Aug 02, 2015 at 09:23:06PM +0200, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains an cpufreq operating point at 0.9 volts. Most A20 boards
> (or all?), however, do not allow the voltage to go below 1.0V. Thus, raise the
> voltage for the lowest operating point to 1.0V so all boards can actually use
> it.

This is not a property of a board, but is the actual limit documented
by Allwinner for the A20. Some individual SoCs might have wider
tolerances, but that's not a property of a board, it's really a
property of a single SoC, and we cannot make any assumption on the
board.

(and please make sure to run checkpatch before sending your patches)

Thanks!
Maxime

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

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