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Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/thermal/stm32-thermal.txt | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/thermal/stm32-thermal.txt b/Documentation/devicetree/bindings/thermal/stm32-thermal.txt new file mode 100644 index 000000000000..8c0d5a4d8031 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/stm32-thermal.txt @@ -0,0 +1,61 @@ +Binding for Thermal Sensor for STMicroelectronics STM32 series of SoCs. + +On STM32 SoCs, the Digital Temperature Sensor (DTS) is in charge of managing an +analog block which delivers a frequency depending on the internal SoC's +temperature. By using a reference frequency, DTS is able to provide a sample +number which can be translated into a temperature by the user. + +DTS provides interrupt notification mechanism by threshold. This mechanism +offers two temperature trip points: passive and critical. The first is intended +for passive cooling notification while the second is used for over-temperature +reset. + +Required parameters: +------------------- + +compatible: Should be "st,stm32-thermal" +reg: This should be the physical base address and length of the + sensor's registers. +clocks: Phandle of the clock used by the thermal sensor. + See: Documentation/devicetree/bindings/clock/clock-bindings.txt +clock-names: Should be "pclk" for register access clock and reference clock. + See: Documentation/devicetree/bindings/resource-names.txt +#thermal-sensor-cells: Should be 0. See ./thermal.txt for a description. +interrupts: Standard way to define interrupt number. + +Example: + + thermal-zones { + cpu_thermal: cpu-thermal { + polling-delay-passive = <0>; + polling-delay = <0>; + + thermal-sensors = <&thermal>; + + trips { + cpu_alert1: cpu-alert1 { + temperature = <85000>; + hysteresis = <0>; + type = "passive"; + }; + + cpu-crit: cpu-crit { + temperature = <120000>; + hysteresis = <0>; + type = "critical"; + }; + }; + + cooling-maps { + }; + }; + }; + + thermal: thermal@50028000 { + compatible = "st,stm32-thermal"; + reg = <0x50028000 0x100>; + clocks = <&rcc TMPSENS>; + clock-names = "pclk"; + #thermal-sensor-cells = <0>; + interrupts = <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>; + }; |