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This driver is based on the thermal management framework in thermal_sys.c. A thermal zone device is created with the trip points to which cooling devices can be bound, the current cooling device is cpufreq, e.g. CPU frequency is clipped down to cool the CPU, and other cooling devices can be added and bound to the trip points dynamically. The platform specific PRCMU interrupts are used to active thermal update when trip points are reached. Signed-off-by: hongbo.zhang <hongbo.zhang@linaro.com> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Francesco Lavra <francescolavra.fl@gmail.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
* ST-Ericsson DB8500 Thermal
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** Thermal node properties:
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- compatible : "stericsson,db8500-thermal";
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- reg : address range of the thermal sensor registers;
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- interrupts : interrupts generated from PRCMU;
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- interrupt-names : "IRQ_HOTMON_LOW" and "IRQ_HOTMON_HIGH";
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- num-trips : number of total trip points, this is required, set it 0 if none,
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if greater than 0, the following properties must be defined;
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- tripN-temp : temperature of trip point N, should be in ascending order;
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- tripN-type : type of trip point N, should be one of "active" "passive" "hot"
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"critical";
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- tripN-cdev-num : number of the cooling devices which can be bound to trip
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point N, this is required if trip point N is defined, set it 0 if none,
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otherwise the following cooling device names must be defined;
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- tripN-cdev-nameM : name of the No. M cooling device of trip point N;
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Usually the num-trips and tripN-*** are separated in board related dts files.
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Example:
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thermal@801573c0 {
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compatible = "stericsson,db8500-thermal";
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reg = <0x801573c0 0x40>;
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interrupts = <21 0x4>, <22 0x4>;
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interrupt-names = "IRQ_HOTMON_LOW", "IRQ_HOTMON_HIGH";
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num-trips = <3>;
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trip0-temp = <75000>;
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trip0-type = "active";
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trip0-cdev-num = <1>;
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trip0-cdev-name0 = "thermal-cpufreq-0";
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trip1-temp = <80000>;
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trip1-type = "active";
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trip1-cdev-num = <2>;
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trip1-cdev-name0 = "thermal-cpufreq-0";
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trip1-cdev-name1 = "thermal-fan";
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trip2-temp = <85000>;
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trip2-type = "critical";
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trip2-cdev-num = <0>;
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}
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