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

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Date:   Mon, 27 Feb 2023 09:53:49 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Jun Nie <jun.nie@...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

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 ?

> 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