dt-bindings: Document ltrf216a light sensor bindings

Add devicetree bindings for ltrf216a ambient light sensor.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
Link: https://lore.kernel.org/r/20220725104050.491396-2-shreeya.patel@collabora.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/light/liteon,ltrf216a.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/light/liteon,ltrf216a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LTRF216A Ambient Light Sensor
+
+maintainers:
+  - Shreeya Patel <shreeya.patel@collabora.com>
+
+description:
+  Ambient light sensing with an i2c interface.
+
+properties:
+  compatible:
+    const: liteon,ltrf216a
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply:
+    description: Regulator that provides power to the sensor.
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        light-sensor@53 {
+            compatible = "liteon,ltrf216a";
+            reg = <0x53>;
+            vdd-supply = <&vdd_regulator>;
+            interrupt-parent = <&gpio0>;
+            interrupts = <5 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };