linux-kernel - Re: [PATCH v3 0/2] thermal: mediatek: Add cpu power cooling model

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Message-ID: <20151106032046.GK3773@ubuntu>
Date:	Fri, 6 Nov 2015 08:50:46 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	dawei chien <dawei.chien@...iatek.com>
Cc:	"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 0/2] thermal: mediatek: Add cpu power cooling model

On 05-11-15, 19:09, dawei chien wrote:
> Thank you for your kindly explaining, now I could understand what I
> miss, I will send device tree binding on next version such like
> following description.
> 
> --- a/Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt
> +++ b/Documentation/devicetree/bindings/clock/mt8173-cpu-dvfs.txt
> @@ -10,6 +10,17 @@ Required properties:
>         Please refer to
> Documentation/devicetree/bindings/clk/clock-bindings.txt for
>         generic clock consumer properties.
>  - proc-supply: Regulator for Vproc of CPU cluster.
> +- dynamic-power-coefficient:
> +       Usage: optional
> +       Value type: <prop-encoded-array>
> +       Definition: A u32 value that represents an indicative
> +       running time dynamic power coefficient in
> +       fundamental units of mW/MHz/uVolt^2.
> +       The dynamic energy consumption of the CPU
> +       is proportional to the square of the
> +       Voltage (V) and the clock frequency (f).
> +       Pdyn = dynamic-power-coefficient * V^2 * f
> +       where voltage is in uV, frequency is in MHz.

Please check with Punit if he is planning to add the same..

> Thank you for your kindly explaining, Now I know I should develop and
> test on mainline branch since this is where I try to add code.
> 
> However, please understanding currently mt8173_cpufreq.c is not ready
> for OPPV2 in mainline as far, that's the reason why currently I can't
> reuse OPPV2 and extend for static power table. My propose is for adding
> CPU cooling device for our own product.

Firstly, we don't care. You are pushing something to mainline, you
have to get it tested someway on mainline.

Secondly, there are *almost* no changes required to the mtk cpufreq
driver for OPPV2. Just update your DT in a similar way it is done for
one of the exynos platforms and it should just work fine.

-- 
viresh
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