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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Saravana Kannan <saravanak@google.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
	Stephen Boyd <sboyd@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	kernel-team@android.com, linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 0/3] Add required-opps support to devfreq passive gov
Date: Mon, 24 Jun 2019 15:13:49 +0530
Message-ID: <20190624094349.rtjb7nuv6g7zmsf2@vireshk-i7> (raw)
In-Reply-To: <20190622003449.33707-1-saravanak@google.com>

On 21-06-19, 17:34, Saravana Kannan 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.

Can you please provide a real world example with DT code here so I
can understand it better ?

-- 
viresh

  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-22  0:34 Saravana Kannan
2019-06-22  0:34 ` [PATCH v1 1/3] OPP: Allow required-opps even if the device doesn't have power-domains Saravana Kannan
2019-06-22  0:34 ` [PATCH v1 2/3] OPP: Add function to look up required OPP's for a given OPP Saravana Kannan
2019-06-22 11:49   ` Chanwoo Choi
2019-06-22 21:41     ` Saravana Kannan
2019-06-23  4:27       ` Chanwoo Choi
2019-06-23  6:07         ` Saravana Kannan
2019-06-22  0:34 ` [PATCH v1 3/3] PM / devfreq: Add required OPPs support to passive governor Saravana Kannan
2019-06-22 12:00   ` Chanwoo Choi
2019-06-22 21:45     ` Saravana Kannan
2019-06-24  9:43 ` Viresh Kumar [this message]
2019-06-24 22:17   ` [PATCH v1 0/3] Add required-opps support to devfreq passive gov Saravana Kannan
2019-06-25  4:10     ` Viresh Kumar
2019-06-25  5:00       ` Saravana Kannan
2019-06-25  5:22         ` Viresh Kumar
2019-06-25  5:29           ` Saravana Kannan
2019-06-26  6:32             ` Viresh Kumar
2019-06-26 18:10               ` Saravana Kannan
2019-06-28  6:49                 ` Viresh Kumar
2019-06-28 20:26                   ` Saravana Kannan
2019-07-11 23:16                     ` Saravana Kannan

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