dt-bindings: iio: light: ltr501: Add proximity-near-level

This value inidcates the proximity level that should be considered
"close".
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211125125646.54831-1-nikita@trvn.ruSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/light/liteon,ltr501.yaml

@@ -9,6 +9,9 @@ title: LiteON LTR501 I2C Proximity and Light sensor
 maintainers:
   - Nikita Travkin <nikita@trvn.ru>
 
+allOf:
+  - $ref: ../common.yaml#
+
 properties:
   compatible:
     enum:
@@ -25,6 +28,8 @@ properties:
   interrupts:
     maxItems: 1
 
+  proximity-near-level: true
+
 additionalProperties: false
 
 required:
@@ -42,6 +47,8 @@ examples:
         light-sensor@23 {
             compatible = "liteon,ltr559";
             reg = <0x23>;
+            proximity-near-level = <75>;
+
             vdd-supply = <&pm8916_l17>;
             vddio-supply = <&pm8916_l6>;