linux-kernel - Re: [PATCH v2] ARM: dts: sun8i-h3: add sy8106a to orange pi plus

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Message-ID: <20181001154545.iwxjgw5exg4psfy4@flea>
Date:   Mon, 1 Oct 2018 17:45:45 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     jorik@...pendief.biz
Cc:     robh+dt@...nel.org, mark.rutland@....com, wens@...e.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2] ARM: dts: sun8i-h3: add sy8106a to orange pi plus

On Sat, Sep 29, 2018 at 03:18:30PM +0200, jorik@...pendief.biz wrote:
> From: Jorik Jonker <jorik@...pendief.biz>
> 
> The Orange Pi Plus board lacks voltage scaling capabilities in its
> current form. This results in random freezes during boot when cpufreq is
> enabled, probably due to wrong voltages.
> 
> This patch (more or less copy/paste from 06139c) does the following
> things on this board:
> - enable r_i2c
> - add sy8106a to the r_i2c bus
> - have the sy8106a regulate VDD of cpu
> 
> Since the Orange Pi Plus has the same PMU setup as the Orange Pi PC, I
> simply took min/max/fixed/ramp from the latter DTS. In that file the
> origin of the values are described by the following comment:
> 
>   "The datasheet uses 1.1V as the minimum value of VDD-CPUX,
>   however both the Armbian DVFS table and the official one
>   have operating points with voltage under 1.1V, and both
>   DVFS table are known to work properly at the lowest
>   operating point.
>   Use 1.0V as the minimum voltage instead."
> 
> I have tested this on patch two Orange Pi Plus boards, by running a
> kernel with this patch and do intermettent runs of cpuburn while
> monitoring voltage, frequency and temperature. The board runs stable
> across its operatiing points while showing a reasonable (< 40C)
> temperature. My Orange Pi PC, when put to the same test, yields similar
> stable results.
> 
> Signed-off-by: Jorik Jonker <jorik@...pendief.biz>

Queued for 4.21, thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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