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

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Date:	Fri, 7 Mar 2014 11:45:09 +0800
From:	Wei Ni <wni@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	Eduardo Valentin <eduardo.valentin@...com>,
	"linux@...ck-us.net" <linux@...ck-us.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"lm-sensors@...sensors.org" <lm-sensors@...sensors.org>
Subject: Re: [PATCH v2 3/3] ARM: tegra: dalmore: add thermal zones for nct1008

On 03/07/2014 01:59 AM, Stephen Warren wrote:
> 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?

No, if this delay is 0, the driver will not run polling queue, but just
cancel it.

> 
>> +
>> +			thermal-sensors = <&nct1008 0>;
>> +		};
> 
> This zone (and the other) is missing the required (per the binding
> documentation) trips and cooling-maps sub-nodes.

Eduardo,
Are the trips and cooling-maps required properties ?
I think if miss these sub-nodes, the thermal zone device also can work,
and in the of-thermal framework, it doesn't handle them as required
property either.

> 
> 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.

Sure.

Thanks.
Wei.

> 

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