linux-kernel - Re: [PATCH 0/3] add CPUs OPPs to sun8i a83t

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Date:   Wed, 28 Feb 2018 15:40:13 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Quentin Schulz <quentin.schulz@...tlin.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
        wens@...e.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, thomas.petazzoni@...tlin.com,
        mylene.josserand@...tlin.com
Subject: Re: [PATCH 0/3] add CPUs OPPs to sun8i a83t

On Wed, Feb 28, 2018 at 02:11:19PM +0100, Quentin Schulz wrote:
> Hi all,
> 
> The Allwinner A83T is an octacore A7 divided in two clusters of 4 A7,
> each cluster having its own regulator and clock.
> 
> Let's add the OPPs for each cluster so that we can use cpufreq on this SoC.
> 
> The operating points were found in Allwinner BSP and fex files and have
> been tested on a TBS A711 with cpuburn and cpufreq-ljt-stress-test.
> 
> Note that there are a few OPPs that are missing:
> 
> 1608000000Hz with 920000mV
> 1800000000Hz with 1000000mV
> 2016000000Hz with 1080000mV
> 
> These OPPs are pretty unstable but it might be due to the SoC quickly
> overheating (till the board completely shuts down).
> It seems[1] impossible to reach those frequencies with none or passive
> cooling, so better leave them out by default.
> 
> It's still possible to add those OPPs on a per-board basis though.
> 
> [1] http://linux-sunxi.org/User:Tkaiser#First_steps_with_Banana_Pi_M3

Applied all three. The patch 3/3 wasn't ordered properly, so I fixed
it, and I removed the newline pointed out by Thomas.

Thanks!
Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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