linux-kernel - Re: [PATCHv9 02/20] thermal: introduce device tree parser

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Message-ID: <52C5A6CE.5060904@nvidia.com>
Date:	Thu, 2 Jan 2014 09:50:06 -0800
From:	Matthew Longnecker <mlongnecker@...dia.com>
To:	Wei Ni <wni@...dia.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	<swarren@...dotorg.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ian.campbell@...rix.com>,
	<rob.herring@...xeda.com>, <linux@...ck-us.net>,
	<rui.zhang@...el.com>
CC:	<grant.likely@...aro.org>, <durgadoss.r@...el.com>,
	<linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv9 02/20] thermal: introduce device tree parser


> I think the platform driver may set governor for the thermal zone,
> so how about to add a property named as "governor",
> and parse it to tzp->governor_name,
> something like:
>                  ret = of_property_read_string(child, "governor", &str);
>                  if (ret == 0)
>                          if (strlen(str) < THERMAL_NAME_LENGTH)
>                                  strcpy(tzp->governor_name, str);
>
> Thanks.
> Wei.

DT is supposed to describe the hardware, right? The governor isn't 
hardware -- it's a software control policy. On the other hand, that 
control policy must be tuned according to the behaviors of the platform 
hardware otherwise the system will be unstable.

Is it appropriate to be naming the governor in DT? If so, is it equally 
appropriate to describe any governor-specific parameters in DT (even 
though they are pure software constructs)?

-Matt
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