[PATCH v2] dt-bindings: iio: adc: adi,ad7816: add binding for AD7816/7/8

[Sudharshan <sudharsanam346@gmail.com>]

Add device tree binding documentation for Analog Devices AD7816,
AD7817 and AD7818 10-bit ADC with on-chip temperature sensor.

The devices communicate over SPI and expose:
  - up to 4 analog input channels (AD7817)
  - on-chip temperature sensor
  - a busy GPIO to signal ongoing conversion

Signed-off-by: Sudharshan <sudharsanam346@gmail.com>
---
 .../bindings/iio/adc/adi,ad7816.yaml          | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml
new file mode 100644
index 000000000000..6780510aaeb9
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7816.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7816/AD7817/AD7818 temperature sensor and ADC
+
+maintainers:
+  - Michael Hennerich <michael.hennerich@analog.com>
+
+description: |
+  The AD7816/AD7817/AD7818 are 10-bit analog to digital converters
+  with an on-chip temperature sensor. They communicate over SPI bus
+  and are commonly used in robotics and industrial applications for
+  temperature monitoring and analog signal conversion.
+
+  Specifications on the converters can be found at:
+    AD7816:
+      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7816.pdf
+    AD7817:
+      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7817.pdf
+    AD7818:
+      https://www.analog.com/media/en/technical-documentation/data-sheets/AD7818.pdf
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7816
+      - adi,ad7817
+      - adi,ad7818
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 1000000
+
+  busy-gpios:
+    description:
+      GPIO connected to the busy pin of the AD7816/7/8.
+      The line is active high and indicates the chip is
+      performing a conversion.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        adc@0 {
+            compatible = "adi,ad7816";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            busy-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
+        };
+    };
-- 
2.53.0