[PATCH v3] dt-bindings: iio: adc: add documentation for adi,ad7816

[wrmfwv]

From: Tenglong Guo <admin@xxxxxxxxxxxx>

Add a YAML binding document for the AD7816 family of ADCs.
This fixes the checkpatch.pl warning about un-documented
DT compatible strings in the staging driver.

Reviewed-by: Sashiko AI <sashiko-bot@xxxxxxxxxx>
Signed-off-by: Tenglong Guo <admin@xxxxxxxxxxxx>
---
 .../bindings/iio/adc/adi,ad7816.yaml          | 83 +++++++++++++++++++
 1 file changed, 83 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..a969e046883a
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7816.yaml
@@ -0,0 +1,83 @@
+# 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 ADC
+
+maintainers:
+  - Tenglong Guo <admin@xxxxxxxxxxxx>
+
+description: |
+  The AD7816/AD7817/AD7818 are 10-bit ADCs with on-chip temperature sensors.
+  They use a SPI interface for communication.
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7816
+      - adi,ad7817
+      - adi,ad7818
+
+  reg:
+    maxItems: 1
+
+  rdwr-gpios:
+    maxItems: 1
+    description: GPIO connected to the RD/WR pin.
+
+  convert-gpios:
+    maxItems: 1
+    description: GPIO connected to the CONVST pin.
+
+  busy-gpios:
+    maxItems: 1
+    description: GPIO connected to the BUSY pin. Required for AD7816 and AD7817.
+
+  interrupts:
+    maxItems: 1
+    description: Optional interrupt for over-temperature indication.
+
+required:
+  - compatible
+  - reg
+  - rdwr-gpios
+  - convert-gpios
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,ad7816
+              - adi,ad7817
+    then:
+      required:
+        - busy-gpios
+    else:
+      properties:
+        busy-gpios: false
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad7816";
+            reg = <0>;
+            rdwr-gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
+            convert-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+            busy-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
+            interrupts-extended = <&gpio0 4 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };
+...
-- 
2.25.1