thermal: sti: Supply Device Tree documentation

Binding for Thermal Sensor driver for STMicroelectronics STi series of SoCs.

Required parameters:

-------------------

compatible : 	st,<SoC>-<module>-thermal; should be one of:

		  "st,stih415-sas-thermal",

		  "st,stih415-mpe-thermal",

		  "st,stih416-sas-thermal"

		  "st,stih416-mpe-thermal"

		  "st,stid127-thermal" or

		  "st,stih407-thermal"

		according to the SoC type (stih415, stih416, stid127, stih407)

		and module type (sas or mpe). On stid127 & stih407 there is only

		one die/module, so there is no module type in the compatible

		string.

clock-names : 	Should be "thermal".

		  See: Documentation/devicetree/bindings/resource-names.txt

clocks : 	Phandle of the clock used by the thermal sensor.

		  See: Documentation/devicetree/bindings/clock/clock-bindings.txt

Optional parameters:

-------------------

reg : 		For non-sysconf based sensors, this should be the physical base

		address and length of the sensor's registers.

interrupts :	Standard way to define interrupt number.

		Interrupt is mandatory to be defined when compatible is

		"stih416-mpe-thermal".

		  NB: For thermal sensor's for which no interrupt has been

		  defined, a polling delay of 1000ms will be used to read the

		  temperature from device.

Example:

	temp1@fdfe8000 {

		compatible	= "st,stih416-mpe-thermal";

		reg		= <0xfdfe8000 0x10>;

		clock-names	= "thermal";

		clocks		= <&clk_m_mpethsens>;

		interrupts	= <GIC_SPI 23 IRQ_TYPE_NONE>;

	};