From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Mon, 3 Aug 2015 11:16:24 +0200 Subject: [linux-sunxi] [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply In-Reply-To: References: <1438543386-7253-1-git-send-email-public_timo.s@silentcreek.de> Message-ID: <20150803091624.GZ2564@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Aug 03, 2015 at 09:35:51AM +1000, Julian Calaby wrote: > Hi Timo, > > On Mon, Aug 3, 2015 at 5:23 AM, 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. > > Surely it wouldn't be added here if some could supply 0.9v. > > Is the code that uses this smart enough to sensibly switch between two > operating points with the same frequency and different voltages? If > so, maybe just add a 144MHz @ 1.0v operating point? And how would it choose between the two exactly ? Switch to the 144MHz @ 0.9V and see if it works ? If it doesn't you might have screwed your system already, and might not be able to recover from it at all. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: