linux-kernel - Re: [PATCH] opp: of: Allow lazy-linking of required-opps to non genpd

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Message-ID: <20210616070948.2oaxc54p5uxknw36@vireshk-i7>
Date:   Wed, 16 Jun 2021 12:39:48 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     "Viresh Kumar )" <vireshk@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "andrew-sh . cheng" <andrew-sh.cheng@...iatek.com>
Subject: Re: [PATCH] opp: of: Allow lazy-linking of required-opps to non genpd

On 16-06-21, 14:25, Hsin-Yi Wang wrote:
> When cpufreq changes, the (cpufreq based) passive governor will
> calculate a target devfreq based on that, and the device governor
> (mt8183-cci-devfreq) will change the actual opp of the device.
> 
> The required-opp is set in the cpufreq table:
> 
> cpufreq_opp_table: opp_table0 {
>     compatible = "operating-points-v2";
>     opp-shared;
>     ...
>     opp0_01 {
>         opp-hz = /bits/ 64 <910000000>;
>         opp-microvolt = <687500>;
>         required-opps = <&opp2_01>;
>     };
>     ...
> };
> 
> devfreq_opp_table: opp_table2 {
>     compatible = "operating-points-v2";
>     opp-shared;
>     ...
>     opp2_01: opp-338000000 {
>         opp-hz = /bits/ 64 <338000000>;
>         opp-microvolt = <687500>;
>     };
>     ...
> };

Ah, you aren't using dev_pm_opp_set_opp() or dev_pm_opp_set_rate()
interfaces.

Looks okay then.

-- 
viresh