linux-kernel - Re: [PATCH 1/2] opp: Attach genpds to devices from within OPP core

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Date:   Mon, 8 Jul 2019 11:31:38 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, niklas.cassel@...aro.org,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] opp: Attach genpds to devices from within OPP core

On 04-07-19, 11:55, Rajendra Nayak wrote:
> 
> On 5/13/2019 3:54 PM, Viresh Kumar wrote:
> > The OPP core requires the virtual device pointers to set performance
> > state on behalf of the device, for the multiple power domain case. The
> > genpd API (dev_pm_domain_attach_by_name()) has evolved now to support
> > even the single power domain case and that lets us add common code for
> > handling both the cases more efficiently.
> > 
> > The virtual device structure returned by dev_pm_domain_attach_by_name()
> > isn't normally used by the cpufreq drivers as they don't manage power
> > on/off of the domains and so is only useful for the OPP core.
> 
> This might be true for CPUs but not necessarily so for IO devices which might
> want to set up device links so the devices runtime pm calls can trigger the
> on/off of the power domain. Is there a way to handle that case now?

https://lore.kernel.org/lkml/027985ce35873cd218298302a1408da06d48458b.1562565567.git.viresh.kumar@linaro.org

-- 
viresh