dt-bindings:iio:humidity:dht11 yaml conversion

The conversion is straight forward, but leaves an open question.
The compatible for this device has never had a vendor.

Harald Geyer has identified as probably being made by aosong,
but we have no current match to any of their more specific part
numbers.  As such, this is noted in the file but the
compatible doesn't include the vendor prefix.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-By: Harald Geyer <harald@ccbib.org>
Link: https://lore.kernel.org/r/20201031134110.724233-5-jic23@kernel.org

Documentation/devicetree/bindings/iio/humidity/dht11.txt

-* DHT11 humidity/temperature sensor (and compatibles like DHT22)
-
-Required properties:
-  - compatible: Should be "dht11"
-  - gpios: Should specify the GPIO connected to the sensor's data
-    line, see "gpios property" in
-    Documentation/devicetree/bindings/gpio/gpio.txt.
-
-Example:
-
-humidity_sensor {
-	compatible = "dht11";
-	gpios = <&gpio0 6 0>;
-}

Documentation/devicetree/bindings/iio/humidity/dht11.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/humidity/dht11.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DHT11 humidity + temperature sensor
+
+maintainers:
+  - Harald Geyer <harald@ccbib.org>
+
+description: |
+   A simple and low cost module providing a non standard single GPIO based
+   interface.  It is believed the part is made by aosong but don't have
+   absolute confirmation of this, or what the aosong part number is.
+
+properties:
+  compatible:
+    const: dht11
+
+  reg:
+    maxItems: 1
+
+  gpios:
+    maxItems: 1
+    description:
+      Single, interrupt capable, GPIO used to communicate with the device.
+
+required:
+  - compatible
+  - gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    humidity_sensor {
+        compatible = "dht11";
+        gpios = <&gpio0 6 0>;
+    };
+...