linux-kernel - Re: [PATCH v5 0/3] Add required-opps support to devfreq passive gov

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Message-ID: <ab504f1d-9024-8ad2-e437-e7c10ad64121@samsung.com>
Date:   Thu, 4 Feb 2021 17:53:18 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Viresh Kumar <vireshk@...nel.org>, linux-pm@...r.kernel.org,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        linux-kernel@...r.kernel.org,
        "MyungJoo Ham )" <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Saravana Kannan <saravanak@...gle.com>
Subject: Re: [PATCH v5 0/3] Add required-opps support to devfreq passive gov

Hi Viresh,

On 2/4/21 2:41 PM, Viresh Kumar wrote:
> On 03-02-21, 17:23, Hsin-Yi Wang wrote:
>> The devfreq passive governor scales the frequency of a "child" device based
>> on the current frequency of a "parent" device (not parent/child in the
>> sense of device hierarchy). As of today, the passive governor requires one
>> of the following to work correctly:
>> 1. The parent and child device have the same number of frequencies
>> 2. The child device driver passes a mapping function to translate from
>>    parent frequency to child frequency.
>>
>> When (1) is not true, (2) is the only option right now. But often times,
>> all that is required is a simple mapping from parent's frequency to child's
>> frequency.
>>
>> Since OPPs already support pointing to other "required-opps", add support
>> for using that to map from parent device frequency to child device
>> frequency. That way, every child device driver doesn't have to implement a
>> separate mapping function anytime (1) isn't true.
> 
> So you guys aren't interested in dev_pm_opp_set_opp() but just the
> translation of the required-OPPs ?
> 
> I am fine with most of the stuff and I would like to take it via OPP
> tree, hope that would be fine ?

I agree. Take these patches to OPP tree.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics