linux-kernel - Re: [RFC/RFT v3 11/14] arm64: dts: meson-g12a: add cpus OPP table

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Message-ID: <7acdafc1-39e7-a2ec-886f-ca337c60dfe7@baylibre.com>
Date:   Wed, 3 Jul 2019 13:53:15 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     jbrunet@...libre.com, khilman@...libre.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [RFC/RFT v3 11/14] arm64: dts: meson-g12a: add cpus OPP table

On 03/07/2019 01:47, Martin Blumenstingl wrote:
> Hi Neil,
> 
> On Mon, Jul 1, 2019 at 11:13 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> Add the OPP table taken from the vendor u200 and u211 DTS.
>>
>> The Amlogic G12A SoC seems to available in 3 types :
>> - low-speed: up to 1,8GHz
>> - mid-speed: up to 1,908GHz
>> - high-speed: up to 2.1GHz
>>
>> And the S905X2 opp voltages are slightly higher than the S905D2
>> OPP voltages for the low-speed table.
>>
>> This adds the conservative OPP table with the S905X2 higher voltages
>> and the maximum low-speed OPP frequency.
> have you considered all three as separate voltage tables?
> you're other patches are assigning the OPP table to the CPU in the
> board.dts anyways, so it's easy to use different OPP tables for
> different boards

We can't assume the board and the CPU type :-/

Kevin told me about cpufreq policy, where we could add a policy reading the
eFUSE and changing the max frequency, then we could add the whole OPP table.

Neil

>