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>;

};