linux-kernel - Re: [PATCH 0/3] OPP: Simplify set_required

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Message-ID: <CABymUCNBkr_65JHNVfbUGjxs6rhnj=eUyZ+5j6VtiDwqzLYtcA@mail.gmail.com>
Date:   Mon, 27 Feb 2023 17:21:56 +0800
From:   Jun Nie <jun.nie@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     cw00.choi@...sung.com, Nishanth Menon <nm@...com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] OPP: Simplify set_required_opp handling

Viresh Kumar <viresh.kumar@...aro.org> 于2023年2月27日周一 12:23写道：
>
> On 24-02-23, 16:17, Jun Nie wrote:
> > For the opp lib, this is right direction. We still need to find a method to
> > pass devfreq device node to opp lib, just genpd_virt_devs for power domain.
>
> I am not really sure I understood it all. What is "device node" ? DT node or
> struct device ? What exactly do you need ?

Sorry for not expressing it accurately. I should say devfreq devices
pointers, just
devfreq_virt_devs vs genpd_virt_devs. Then you know why I add devfreq-devs
dts nodes below.

>
> > But I am not clear below is the right way yet and this also involves wider
> > changes. Or the opp's owner, devfreq device can be referred via opp lib?
> > If so, we do not need to add devfreq-devs to cpu node at all.
> >
> >               cpu1: cpu@101 {
> >                       compatible = "arm,cortex-a53";
> >                       device_type = "cpu";
> >                       power-domains = <&cpr>;
> >                       power-domain-names = "cpr";
> >                       devfreq-devs = <&cci>;
> >                       devfreq-names = "cci";
>
> Why do you need these ?
>
> >                       operating-points-v2 = <&cluster1_opp_table>;
> >               };
> >
> >               opp-200000000 {
> >                       opp-hz = /bits/ 64 <200000000>;
> >                       required-opps = <&cpr_opp3>, <&cci_opp1>;
>
> This looks fine though.
>
> >               };
>
> --
> viresh