linux-kernel - Re: [PATCH 0/6] arm64: g12a: add support for DVFS

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Message-ID: <7h1rxu42tj.fsf@baylibre.com>
Date:   Fri, 09 Aug 2019 11:21:44 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] arm64: g12a: add support for DVFS

Kevin Hilman <khilman@...libre.com> writes:

> Kevin Hilman <khilman@...libre.com> writes:
>
>> Neil Armstrong <narmstrong@...libre.com> writes:
>>
>>> The G12A & G12B SoCs has kernel controllable CPU clocks and PWMs for
>>> voltage regulators.
>>>
>>> This patchsets moves the meson-g12a.dtsi to meson-g12-common.dtsi to simplify
>>> handling the G12A & G12B differences in the meson-g12a.dtsi & meson-g12b.dtsi
>>> files, like the OPPs and CPU nodes.
>>>
>>> Then G12A & G12B OPP tables are added, followed by the CPU voltages regulators
>>> in each boards DT.
>>>
>>> It was voluntary chosen to enabled DVFS (CPU regulator and CPU clocks) only
>>> in boards, to make sure only tested boards has DVFS enabled.
>>>
>>> This patchset :
>>> - moves the G12A DT to a common g12a-common dtsi
>>> - adds the G12A and G12B OPPs
>>> - enables DVFS on all supported boards
>>>
>>> Dependencies:
>>> - None
>>
>> Not quite.  The last patch to enable DVFS on odroid-n2 has a build-time
>> dependency on the clock series that adds the CPUB clock.
>>
>> I'll apply the rest of the series to v5.4/dt64 until there's a stable
>> clock tag I can use for the clocks.
>
> In order to test this, I noticed another dependency needed for the PWM
> regulators to work:
>
>    https://lore.kernel.org/linux-amlogic/20190729125838.6498-1-narmstrong@baylibre.com/
>
> With that and the clock deps, it's working well on my odroid-n2.
>
> Tested-by: Kevin Hilman <khilman@...libre.com>

Also now tested on g12a: u200, x96-max and sei510 boards.

Kevin