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Date: Wed, 27 Aug 2014 10:54:07 +0800 From: Wei Ni <wni@...dia.com> To: Eduardo Valentin <edubezval@...il.com> CC: <khali@...ux-fr.org>, <linux@...ck-us.net>, <swarren@...dotorg.org>, <lm-sensors@...sensors.org>, <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v3 3/4] thermal: add more description for thermal-zones On 08/26/2014 08:12 PM, Eduardo Valentin wrote: > On Tue, Aug 26, 2014 at 10:17:29AM +0800, Wei Ni wrote: >> On 08/25/2014 07:07 PM, Eduardo Valentin wrote: >>> Hello Wei Ni, >>> >>> On Mon, Aug 25, 2014 at 02:29:47PM +0800, Wei Ni wrote: >>>> Add more description for the "polling-delay" property. >>>> Set "trips" and "cooling maps" as optional property, because >>>> if missing these two sub-nodes, the thermal zone device still >>>> work properly. >>>> >>>> Signed-off-by: Wei Ni <wni@...dia.com> >>>> --- >>>> Documentation/devicetree/bindings/thermal/thermal.txt | 10 ++++++---- >>>> 1 file changed, 6 insertions(+), 4 deletions(-) >>>> >>>> diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt >>>> index f5db6b7..e3d3ed9 100644 >>>> --- a/Documentation/devicetree/bindings/thermal/thermal.txt >>>> +++ b/Documentation/devicetree/bindings/thermal/thermal.txt >>>> @@ -136,8 +136,8 @@ containing trip nodes and one sub-node containing all the zone cooling maps. >>>> >>>> Required properties: >>>> - polling-delay: The maximum number of milliseconds to wait between polls >>>> - Type: unsigned when checking this thermal zone. >>>> - Size: one cell >>>> + Type: unsigned when checking this thermal zone. If this value is 0, the >>>> + Size: one cell driver will not run polling queue, but just cancel it. >>>> >>> >>> The description above is specific to Linux kernel implementation >>> nomenclature. DT description needs to be OS agnostic. >>> >>>> - polling-delay-passive: The maximum number of milliseconds to wait >>>> Type: unsigned between polls when performing passive cooling. >>>> @@ -148,14 +148,16 @@ Required properties: >>>> phandles + sensor >>>> specifier >>>> >>>> +Optional property: >>>> - trips: A sub-node which is a container of only trip point nodes >>>> Type: sub-node required to describe the thermal zone. >>>> >>>> - cooling-maps: A sub-node which is a container of only cooling device >>>> Type: sub-node map nodes, used to describe the relation between trips >>>> - and cooling devices. >>>> + and cooling devices. If missing the "trips" property, >>>> + This sub-node will not be parsed, because no trips can >>>> + be bound to cooling devices. >>> >>> Do you mean if the thermal zone misses the "trips" property? Actually, >>> the binding describes both, cooling-maps and trips, as required >>> properties. Thus, both needs to be in place to consider the thermal zone >>> as a proper described zone. >> >> I moved the "trips" and "cooling-maps" to optional property, because if >> missing these two properties, the thermal zone devices still can be >> registered, and the driver can work properly, it has the basic function, >> can read temperature from thermal sysfs, although it doesn't have trips >> and bind with cooling devices. > > > If a thermal zone is used only for monitoring, then I believe it lost > its purpose. As Maybe a different framework shall be used, such as hwmon, > for instance? Yes, if we only use it for monitoring, we can use hwmon. But we have more functions base on these two thermal zone devices. We have a skin-temperature driver, which used nct1008's remote and local temperatures to estimator the skin temperature. As you know the thermal framework is more powerful, the remote/local sensors can be register as thermal zone, then the skin-temp driver can use thermal_zone_get_temp() to read their temperatures and then estimator skin's temp. We also will set trips and cooling devices for this skin-temp. Wei. > > The purpose of a thermal zone is to describe thermal behavior of a > hardware. As it is mentioned in the thermal.txt file. > > >> >> Thanks. >> Wei. >> >>> >>>> >>>> -Optional property: >>>> - coefficients: An array of integers (one signed cell) containing >>>> Type: array coefficients to compose a linear relation between >>>> Elem size: one cell the sensors listed in the thermal-sensors property. >>>> -- >>>> 1.8.1.5 >>>> >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-tegra" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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