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BeagleBoard-X15 has capability for a fan and has an onboard TMP102 temperature sensor as well. This allows us to create a new thermal zone (called, un-imaginatively "board"), and allows us to use some active cooling as temperatures start edge upward in the system by creating a new alert temperature (emperically 50C) for cpu. NOTE: Fan is NOT mounted by default on the platform, in such a case, all we end up doing is switch on a regulator and leak very minimal current. Signed-off-by: Nishanth Menon <nm@ti.com> Acked-by: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
42 lines
1.2 KiB
Plaintext
42 lines
1.2 KiB
Plaintext
/*
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* Device Tree Source for OMAP4/5 SoC CPU thermal
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*
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* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
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* Contact: Eduardo Valentin <eduardo.valentin@ti.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <dt-bindings/thermal/thermal.h>
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cpu_thermal: cpu_thermal {
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polling-delay-passive = <250>; /* milliseconds */
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polling-delay = <1000>; /* milliseconds */
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/* sensor ID */
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thermal-sensors = <&bandgap 0>;
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cpu_trips: trips {
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cpu_alert0: cpu_alert {
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temperature = <100000>; /* millicelsius */
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hysteresis = <2000>; /* millicelsius */
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type = "passive";
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};
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cpu_crit: cpu_crit {
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temperature = <125000>; /* millicelsius */
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hysteresis = <2000>; /* millicelsius */
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type = "critical";
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};
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};
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cpu_cooling_maps: cooling-maps {
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map0 {
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trip = <&cpu_alert0>;
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cooling-device =
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<&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
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};
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};
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};
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