dt-bindings: thermal: al-thermal: Add binding documentation

Add thermal binding documentation for Amazon's Annapurna Labs Thermal
Sensor.

Signed-off-by: Talel Shenhar <talel@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

diff --git a/Documentation/devicetree/bindings/thermal/amazon,al-thermal.txt b/Documentation/devicetree/bindings/thermal/amazon,al-thermal.txt
new file mode 100644 (file)
index 0000000..703979d
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/amazon,al-thermal.txt
@@ -0,0 +1,33 @@
+Amazon's Annapurna Labs Thermal Sensor
+
+Simple thermal device that allows temperature reading by a single MMIO
+transaction.
+
+Required properties:
+- compatible: "amazon,al-thermal".
+- reg: The physical base address and length of the sensor's registers.
+- #thermal-sensor-cells: Must be 1. See ./thermal.txt for a description.
+
+Example:
+       thermal: thermal {
+               compatible = "amazon,al-thermal";
+               reg = <0x0 0x05002860 0x0 0x1>;
+               #thermal-sensor-cells = <0x1>;
+       };
+
+       thermal-zones {
+               thermal-z0 {
+                       polling-delay-passive = <250>;
+                       polling-delay = <1000>;
+                       thermal-sensors = <&thermal 0>;
+                       trips {
+                               critical {
+                                       temperature = <105000>;
+                                       hysteresis = <2000>;
+                                       type = "critical";
+                               };
+                       };
+
+               };
+       };
+