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

From: Viresh Kumar
Date: Mon Jul 08 2019 - 02:01:44 EST

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?