linux-kernel - Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

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Message-ID: <8af4327f-b779-9d97-347f-bfe4b8303a60@free-electrons.com>
Date:   Mon, 19 Dec 2016 15:18:03 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>, Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

Hi,

On 19/12/2016 15:06, Icenowy Zheng wrote:
> 
> After proper testing of A23 ccu, the operating points can also apply to A23.
> (According to A23 devices' fex)
> 

I disagree. I've looked into using the same operating points for A23 and
A33 for CPUfreq and I came to the conclusion that not all A23-based
boards share the same operating points. You can find the fex files for
the different boards here:
https://github.com/linux-sunxi/sunxi-boards/tree/master/sys_config/a23

After gathering all supported frequencies/voltages for each A23-based
boards, I found that only the following frequencies and voltages are
supported by all A23-based boards:

 - 1008 MHz, 1220 mV
 - 816 MHz, 1120 mV
 - 600 MHz, 1040 mV

Quentin

-- 
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com