linux-kernel - Re: [PATCH v3 02/11] ARM: sun8i: a33: add all operating points

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Date:   Wed, 22 Mar 2017 11:31:54 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Lee Jones <lee.jones@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Jonathan Cameron <jic23@...nel.org>, knaack.h@....de,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-iio@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Icenowy Zheng <icenowy@...c.xyz>
Subject: Re: [PATCH v3 02/11] ARM: sun8i: a33: add all operating points

On Tue, Mar 21, 2017 at 11:36 PM, Quentin Schulz
<quentin.schulz@...e-electrons.com> wrote:
> This adds almost all operating points allowed for the A33 as defined by
> fex files available at:
> https://github.com/linux-sunxi/sunxi-boards/tree/master/sys_config/a33
>
> There are more possible frequencies in this patch than there are in the
> fex files because the fex files only give an interval of possible
> frequencies for a given voltage. All supported frequencies are defined
> in the original driver code in Allwinner vendor tree.
>
> There are two missing frequencies though: 1104MHz and 1200MHz which
> require the CPU to have 1.32V supplied, which is higher than the default
> voltage.
>
> Without all A33 boards defining the CPU regulator, we cannot have these
> two frequencies as it would cause the CPU to try to run a higher
> frequency without "overvolting" which is very likely to crash the CPU.
>
> Therefore, these two frequencies must be enabled on a per-board basis.
>
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>

Acked-by: Chen-Yu Tsai <wens@...e.org>