[PATCH 3/3] dt-bindings: adc: ad7887: add binding doc for AD7887

[Alexandru Ardelean <alexandru.ardelean@analog.com>]

This change adds a simple device-tree binding for thhe Analog Devices
AD7887 ADC.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 .../bindings/iio/adc/adi,ad7887.yaml          | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7887.yaml

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7887.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7887.yaml
new file mode 100644
index 000000000000..9b30f4569b4e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7887.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7887.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD7887 low power, 12-bit ADC
+
+maintainers:
+  - Michael Hennerich <michael.hennerich@analog.com>
+
+description: |
+  Analog Devices AD7887 low power, 12-bit analog-to-digital converter (ADC)
+  that operates from a single 2.7 V to 5.25 V power supply.
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7887
+
+  reg:
+    maxItems: 1
+
+  spi-cpha: true
+
+  spi-cpol: true
+
+  avcc-supply: true
+
+  spi-max-frequency: true
+
+  vref-supply:
+    description:
+      ADC reference voltage supply
+
+  adi,dual-channel-mode:
+    description:
+      Configures dual-channel mode for the ADC. In dual-channel operation,
+      the AIN1/VREF pin assumes its AIN1 function, providing a second analog
+      input channel. In this case, he reference voltage for the part is provided
+      via the VDD pin. As a result, the input voltage range on both the AIN0 and
+      AIN1 inputs is 0 to VDD.
+    type: boolean
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - spi-cpha
+  - spi-cpol
+
+examples:
+  - |
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+                compatible = "adi,ad7887";
+                reg = <0>;
+                spi-max-frequency = <1000000>;
+                spi-cpol;
+                spi-cpha;
+
+                avcc-supply = <&adc_supply>;
+                vref-supply = <&adc_vref>;
+        };
+    };
+...
-- 
2.17.1