dt-bindings: iio: adc: ad7380: add pseudo-differential parts

Adding AD7383 and AD7384 compatible parts that are pseudo-differential.

Pseudo-differential require common mode voltage supplies, so add them
conditionally

Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240528-adding-new-ad738x-driver-v7-3-4cd70a4c12c8@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml

@@ -13,6 +13,8 @@ maintainers:
 description: |
   * https://www.analog.com/en/products/ad7380.html
   * https://www.analog.com/en/products/ad7381.html
+  * https://www.analog.com/en/products/ad7383.html
+  * https://www.analog.com/en/products/ad7384.html
 
 $ref: /schemas/spi/spi-peripheral-props.yaml#
 
@@ -21,6 +23,8 @@ properties:
     enum:
       - adi,ad7380
       - adi,ad7381
+      - adi,ad7383
+      - adi,ad7384
 
   reg:
     maxItems: 1
@@ -42,6 +46,16 @@ properties:
       A 2.5V to 3.3V supply for the external reference voltage. When omitted,
       the internal 2.5V reference is used.
 
+  aina-supply:
+    description:
+      The common mode voltage supply for the AINA- pin on pseudo-differential
+      chips.
+
+  ainb-supply:
+    description:
+      The common mode voltage supply for the AINB- pin on pseudo-differential
+      chips.
+
   interrupts:
     description:
       When the device is using 1-wire mode, this property is used to optionally
@@ -56,6 +70,24 @@ required:
 
 unevaluatedProperties: false
 
+allOf:
+  # pseudo-differential chips require common mode voltage supplies,
+  # true differential chips don't use them
+  - if:
+      properties:
+        compatible:
+          enum:
+            - adi,ad7383
+            - adi,ad7384
+    then:
+      required:
+        - aina-supply
+        - ainb-supply
+    else:
+      properties:
+        aina-supply: false
+        ainb-supply: false
+
 examples:
   - |
     #include <dt-bindings/interrupt-controller/irq.h>