62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
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Binding for Thermal Sensor for STMicroelectronics STM32 series of SoCs.
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On STM32 SoCs, the Digital Temperature Sensor (DTS) is in charge of managing an
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analog block which delivers a frequency depending on the internal SoC's
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temperature. By using a reference frequency, DTS is able to provide a sample
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number which can be translated into a temperature by the user.
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DTS provides interrupt notification mechanism by threshold. This mechanism
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offers two temperature trip points: passive and critical. The first is intended
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for passive cooling notification while the second is used for over-temperature
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reset.
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Required parameters:
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-------------------
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compatible: Should be "st,stm32-thermal"
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reg: This should be the physical base address and length of the
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sensor's registers.
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clocks: Phandle of the clock used by the thermal sensor.
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See: Documentation/devicetree/bindings/clock/clock-bindings.txt
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clock-names: Should be "pclk" for register access clock and reference clock.
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See: Documentation/devicetree/bindings/resource-names.txt
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#thermal-sensor-cells: Should be 0. See ./thermal.txt for a description.
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interrupts: Standard way to define interrupt number.
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Example:
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thermal-zones {
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cpu_thermal: cpu-thermal {
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polling-delay-passive = <0>;
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polling-delay = <0>;
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thermal-sensors = <&thermal>;
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trips {
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cpu_alert1: cpu-alert1 {
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temperature = <85000>;
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hysteresis = <0>;
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type = "passive";
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};
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cpu-crit: cpu-crit {
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temperature = <120000>;
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hysteresis = <0>;
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type = "critical";
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};
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};
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cooling-maps {
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};
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};
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};
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thermal: thermal@50028000 {
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compatible = "st,stm32-thermal";
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reg = <0x50028000 0x100>;
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clocks = <&rcc TMPSENS>;
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clock-names = "pclk";
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#thermal-sensor-cells = <0>;
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interrupts = <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
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};
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