linux-kernel - Re: [PATCH RFC v1 7/8] drivers: qcom: cpu

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Message-ID: <20181011112013.GC32752@e107155-lin>
Date:   Thu, 11 Oct 2018 12:20:13 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org, rjw@...ysocki.net,
        ulf.hansson@...aro.org, khilman@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, sboyd@...nel.org, evgreen@...omium.org,
        dianders@...omium.org, mka@...omium.org, ilina@...eaurora.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH RFC v1 7/8] drivers: qcom: cpu_pd: Handle cpu hotplug in
 the domain

On Thu, Oct 11, 2018 at 02:50:54AM +0530, Raju P.L.S.S.S.N wrote:
> Use cpu hotplug callback mechanism to attach/dettach the cpu in
> the cpu power domain. During cpu hotplug callback registration,
> the starting callback is invoked on all online cpus. So there is
> no need to attach from device probe.
>

To be more explicit, NACK to this series(patches 4-8 to be more specific)
unless you provide details on:

1. Why this is not in PSCI implementation ?
2. If PSCI is used on this platform, how does it work/co-exist ?
3. Is this a shortcut approached taken to bypass the CPU genpd attempts
   from Lina/Ulf ?

--
Regards,
Sudeep