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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Fri, 7 Jun 2019 13:19:22 +0200
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Subject: Re: [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI
To:     Sudeep Holla <sudeep.holla@arm.com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
        Mark Rutland <mark.rutland@arm.com>
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        Daniel Lezcano <daniel.lezcano@linaro.org>,
        "Raju P . L . S . S . S . N" <rplsssn@codeaurora.org>,
        Amit Kucheria <amit.kucheria@linaro.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Niklas Cassel <niklas.cassel@linaro.org>,
        Tony Lindgren <tony@atomide.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Kevin Hilman <khilman@kernel.org>,
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        Geert Uytterhoeven <geert+renesas@glider.be>,
        Souvik Chakravarty <souvik.chakravarty@arm.com>,
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Sudeep, Lorenzo, Mark,

On Mon, 13 May 2019 at 21:23, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> This series enables support for hierarchical CPU arrangement, managed by PSCI
> for ARM/ARM64. It's based on using the generic PM domain (genpd), which
> recently was extended to manage devices belonging to CPUs.
>
> The last two DTS patches enables the hierarchical topology to be used for the
> Qcom 410c Dragonboard and the Hisilicon Hikey board. The former uses PSCI OS-
> initiated mode, while the latter uses the PSCI Platform-Coordinated mode. In
> other words, the hierarchical description of the topology in DT, is orthogonal
> to the supported PSCI CPU suspend mode.
>
> Do note, these patches have been posted earlier, but then being part of bigger
> series, which at that point also included the needed infrastructure changes to
> genpd and cpuidle. Rather than continue to carry the old version history,
> which may be a bit confusing, I decided to start over. Although, for clarity,
> the changelog below explains what changes that have been made since the last
> submission was made.

Is there anything I can do to help the review to get going here?

FYI, I hosted a talk about "cluster idle" at OSPM in Pisa a few weeks
ago. There is a couple of slides [1] with flowcharts of how it works,
that may be of interest for you.

Kind regards
Uffe

[...]

[1]
http://retis.sssup.it/ospm-summit/Downloads/01_02-ClusterIdle_UlfHansson.pdf