linux-kernel - Re: [PATCH v2 0/5] PM: domains: Add helpers for multi PM domains to avoid open-coding

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Date: Fri, 26 Jan 2024 11:07:57 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Kevin Hilman <khilman@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>, linux-pm@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Nikunj Kela <nkela@...cinc.com>,
	Prasad Sodagudi <psodagud@...cinc.com>,
	Stephan Gerhold <stephan@...hold.net>,
	Ben Horgan <Ben.Horgan@....com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-remoteproc@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v2 0/5] PM: domains: Add helpers for multi PM domains to
 avoid open-coding

On Fri, Jan 26, 2024 at 05:12:12PM +0100, Ulf Hansson wrote:
> On Fri, 5 Jan 2024 at 17:01, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> >
> > Updates in v2:
> >         - Ccing Daniel Baluta and Iuliana Prodan the NXP remoteproc patches to
> >         requests help with testing.
> >         - Fixed NULL pointer bug in patch1, pointed out by Nikunj.
> >         - Added some tested/reviewed-by tags.
> >
> >
> > Attaching/detaching of a device to multiple PM domains has started to become a
> > common operation for many drivers, typically during ->probe() and ->remove().
> > In most cases, this has lead to lots of boilerplate code in the drivers.
> >
> > This series adds a pair of helper functions to manage the attach/detach of a
> > device to its multiple PM domains. Moreover, a couple of drivers have been
> > converted to use the new helpers as a proof of concept.
> >
> > Note 1)
> > The changes in the drivers have only been compile tested, while the helpers
> > have been tested along with a couple of local dummy drivers that I have hacked
> > up to model both genpd providers and genpd consumers.
> >
> > Note 2)
> > I was struggling to make up mind if we should have a separate helper to attach
> > all available power-domains described in DT, rather than providing "NULL" to the
> > dev_pm_domain_attach_list(). I decided not to, but please let me know if you
> > prefer the other option.
> >
> > Note 3)
> > For OPP integration, as a follow up I am striving to make the
> > dev_pm_opp_attach_genpd() redundant. Instead I think we should move towards
> > using dev_pm_opp_set_config()->_opp_set_required_devs(), which would allow us to
> > use the helpers that $subject series is adding.
> >
> > Kind regards
> > Ulf Hansson
> 
> Rafael, Greg, do have any objections to this series or would you be
> okay that I queue this up via my pmdomain tree?

I'll defer to Rafael here.