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dt-bindings: stm32-thermal: add binding documentation

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Add thermal binding documentation for STM32 DTS sensor

Signed-off-by: David Hernandez Sanchez <david.hernandezsanchez@st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
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David HERNANDEZ SANCHEZ 2018-10-05 10:08:45 +00:00 committed by Eduardo Valentin
parent 92ca366e9b
commit 7f1a22ce59
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Documentation/devicetree/bindings/thermal/stm32-thermal.txt Normal file
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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>;
};