71 lines
1.7 KiB
Plaintext
71 lines
1.7 KiB
Plaintext
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* User space thermal alert cooling device node
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Provides the facility for user space to know whether a thermal alert
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occurred or not for a particular temperature trip value. This is Supported
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by adding a Thermal cooling device.
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This cooling device is intended with single trip point. When associated
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with multiple trip points, alert will come for every trip temperature except
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for the case when temperature goes to lower than the lowest trip temperature.
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Required properties:
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- compatible: "userspace-therm-alert";
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- cdev-type: Name of cdev.
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Type: string
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Size: one cell
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- #cooling-cells: Provides cooling device specific information.
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Type: unsigned Must be at least 2, to represent minimum followed
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Size: one cell by maximum cooling state.
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Optional properties:
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- cooling-min-level: The smallest cooling state.
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Type: unsigned
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Size: one cell
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- cooling-max-level: The largest cooling state.
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Type: unsigned
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Size: one cell
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For more information on cooling device refer,
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Documentation/devicetree/bindings/thermal/thermal.txt
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Examples:
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userspace-alert {
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compatible = "userspace-therm-alert";
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cdev-type = "userspace-alert";
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cooling-min-state = <0>;
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cooling-max-state = <1>;
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#cooling-cells = <2>;
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};
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thermal-zones {
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Tdiode{
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status = "okay";
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thermal-zone-params {
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governor-name = "pid_thermal_gov";
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};
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trips {
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trip_usr_alert {
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temperature = <60000>;
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type = "passive";
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hysteresis = <1>;
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writable;
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};
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};
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cooling-maps {
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map0 {
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trip = <&{/thermal-zones/Tdiode_tegra/trips/trip_usr_alert}>;
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cdev-type = "userspace-alert";
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cooling-device = <&{/userspace-alert} THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
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};
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};
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};
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