linux-kernel - Re: [PATCH 0/7] OPP/pmdomain: Assign required

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Date: Mon, 24 Jun 2024 17:02:55 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>, 
	Bjorn Andersson <andersson@...nel.org>, Nikunj Kela <nkela@...cinc.com>, 
	Prasad Sodagudi <psodagud@...cinc.com>, Thierry Reding <thierry.reding@...il.com>, 
	Jonathan Hunter <jonathanh@...dia.com>, linux-pm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] OPP/pmdomain: Assign required_devs for required OPPs
 through genpd

On Sat, 22 Jun 2024 at 14:18, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> On 19.06.2024 4:08 PM, Ulf Hansson wrote:
> > Through dev_pm_opp_set_config() the _opp_attach_genpd() allows consumer
> > drivers to hook up a device to its PM domains. This works for both a single
> > and multiple PM domains. Their corresponding virtual devices that are
> > created by genpd during attach, are later being assigned as the
> > required_devs for the corresponding required OPPs.
> >
> > In principle this works fine, but there are some problems. Especially as
> > the index for a "required-opps" may not necessarily need to match the index
> > for the "power-domain" in DT, in which case things gets screwed up.
>
> So, is this series essentially tackling a problem like this:
>
> pdp_A: power-domain-provider@...aaa {
>         [...]
>
>         opp-table {
>                 pdp_A_opp0: opp-0 {
>                         opp-level = <0>;
>                 };
>         };
> };
>
> pdp_B: power-domain-provider@...bbbb {
>         [...]
>
>         opp-table {
>                 pdp_B_opp0: opp-0 {
>                         opp-level = <0>;
>                 };
>         };
> };
>
> nice-device@...cccc {
>         [...]
>
>         power-domains = <&pdp_A>,
>                         <&pdp_B>;
>         // order doesn't match /\
>         required-opps = <&pdp_B_opp0>,
>                         <&pdp_A_opp0>;
> };
>
>
> ?
>

Correct, this should be taken care off by $subject series.

Kind regards
Uffe