Re: [PATCH 0/8] cpufreq: Auto-register with energy model

From: Viresh Kumar
Date: Wed Aug 11 2021 - 05:53:18 EST

On 11-08-21, 10:48, Quentin Perret wrote:
> I think this should work, but perhaps will be a bit tricky for cpufreq
> driver developers as they need to have a pretty good understanding of
> the stack to know that they should do the registration from here and not
> ->init() for instance. Suggested alternative: we introduce a ->register_em()
> callback to cpufreq_driver, and turn dev_pm_opp_of_register_em() into a
> valid handler for this callback. This should 'document' things a bit
> better, avoid some of the problems your other series tried to achieve, and
> allow us to call the EM registration in exactly the right place from
> cpufreq core. On the plus side, we could easily make this work for e.g.
> the SCMI driver which would only need to provide its own version of
> ->register_em().
> Thoughts?

I had exactly the same thing in mind, but was thinking of two
callbacks, to register and unregister. But yeah, we aren't going to
register for now at least :)

I wasn't sure if that should be done or not, since we also have
ready() callback. So was reluctant to suggest it earlier. But that can
work well as well.