dt-bindings: iio: light: ROHM BU27008

The ROHM BU27008 is a sensor with 5 photodiodes (red, green, blue, clear
and IR) with four configurable channels. Red and green being always
available and two out of the rest three (blue, clear, IR) can be
selected to be simultaneously measured. Typical application is adjusting
LCD backlight of TVs, mobile phones and tablet PCs.

Add BU27008 dt-bindings.
Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/f24196e11ee73511312b629daa20c7d783d8bf6c.1683541225.git.mazziesaccount@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/light/rohm,bu27008.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/light/rohm,bu27008.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ROHM BU27008 color sensor
+
+maintainers:
+  - Matti Vaittinen <mazziesaccount@gmail.com>
+
+description:
+  The ROHM BU27008 is a sensor with 5 photodiodes (red, green, blue, clear
+  and IR) with four configurable channels. Red and green being always
+  available and two out of the rest three (blue, clear, IR) can be
+  selected to be simultaneously measured. Typical application is adjusting
+  LCD backlight of TVs, mobile phones and tablet PCs.
+
+properties:
+  compatible:
+    const: rohm,bu27008
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      light-sensor@38 {
+        compatible = "rohm,bu27008";
+        reg = <0x38>;
+      };
+    };
+
+...