linux-kernel - Re: [PATCH v3 1/2] thermal: mediatek: Add cpu power cooling model.

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Message-ID: <20151106032433.GL3773@ubuntu>
Date:	Fri, 6 Nov 2015 08:54:33 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	dawei chien <dawei.chien@...iatek.com>,
	Javi Merino <javi.merino@....com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v3 1/2] thermal: mediatek: Add cpu power cooling model.

Cc'ing Javi (which you should have as he wrote the power-thing for
cpu-cooling).

On 05-11-15, 19:10, dawei chien wrote:
> This is because our platform currently only support mt8173_cpufreq.c, so
> that I only add static power model for our owner IC.

Bindings are (normally) supposed to be general than a platform
specific.

> Please understanding that I wouldn't give a DT binding document since I
> will remove static power table on next version, but I can try to explain
> it.

Then just don't add things in the first place.

> As far as I know, static power is somewhat leakage of CPU clusters, so
> that we hardly to find a formula, which can suitable all kinds of CPUs
> since leakage is different. In ARM IPA framework, static power only need
> to be defined by who register cpufreq_power_cooling_register. The
> voltage/power table is just one way to present leakage power of CPUs.

The bindings don't fix the values for static power, but just provides
a field for platforms to use. Everyone can then send its own power
figures. Why do you thing it can't be generalized?

> Actually, static power is optional since dynamic power is much more than
> static power.

Maybe, we should still capture it.

@Javi ?

-- 
viresh
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