linux-kernel - Re: [PATCH v2 3/3] ARM: tegra: dalmore: add thermal zones for nct1008

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Date:	Thu, 06 Mar 2014 10:59:44 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Wei Ni <wni@...dia.com>, khali@...ux-fr.org, linux@...ck-us.net
CC:	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
	lm-sensors@...sensors.org
Subject: Re: [PATCH v2 3/3] ARM: tegra: dalmore: add thermal zones for nct1008

On 03/04/2014 04:31 AM, Wei Ni wrote:
> Add dt node to describe the thermal zone for the nct1008.

> diff --git a/arch/arm/boot/dts/tegra114-dalmore.dts b/arch/arm/boot/dts/tegra114-dalmore.dts

> +	thermal-zones {
> +		nct1008-local {
> +			polling-delay-passive = <2000>; /* milliseconds */
> +			polling-delay = <0>; /* milliseconds */

A delay of 0 implies that software continually polls this zone, thus
consuming an entire CPU. Is this really what you want?

> +
> +			thermal-sensors = <&nct1008 0>;
> +		};

This zone (and the other) is missing the required (per the binding
documentation) trips and cooling-maps sub-nodes.

I've also sent a query in response to the thermal-zones binding so see
whether or not it can be fixed so that software doesn't bind against the
node name, but rather against a compatible property like almost
everything else. Let's see what the response is there before reposting
this patch.
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