linux-kernel - Re: [PATCH 07/15] arm: dts: exynos: Add missing cooling device properties for CPUs

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Message-ID: <20180531052234.tp6pw45ftsf3g2el@vireshk-i7>
Date:   Thu, 31 May 2018 10:52:34 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     arm@...nel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kukjin Kim <kgene@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        ionela.voinescu@....com,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        chris.redpath@....com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/15] arm: dts: exynos: Add missing cooling device
 properties for CPUs

On 30-05-18, 14:32, Krzysztof Kozlowski wrote:
> OK, I see the possibility although it is still far away from use
> cases. You cannot hotplug booting CPU (CPU0) on Exynos kernels. It
> never worked. Strictly speaking - offlining will work. But bringing it
> online will likely hang the system.

True and I used the following out of tree patch for a long time for my
dual A15 exynos to make hotplug work.

https://git.linaro.org/people/vireshk/backup/linux.git/commit/?h=bkp/exynos/hotplug&id=aab8a906a70b8f1fb15a4b7bd2ee27e6dcabf79d

-- 
viresh