dt-bindings: iio: adc: ad7380: add support for ad738x-4 4 channels variants

Add compatible support for ad7380/1/3/4-4 parts which are 4 channels
variants from ad7380/1/3/4

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-v7-6-4cd70a4c12c8@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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

@@ -15,6 +15,10 @@ description: |
   * https://www.analog.com/en/products/ad7381.html
   * https://www.analog.com/en/products/ad7383.html
   * https://www.analog.com/en/products/ad7384.html
+  * https://www.analog.com/en/products/ad7380-4.html
+  * https://www.analog.com/en/products/ad7381-4.html
+  * https://www.analog.com/en/products/ad7383-4.html
+  * https://www.analog.com/en/products/ad7384-4.html
 
 $ref: /schemas/spi/spi-peripheral-props.yaml#
 
@@ -25,6 +29,10 @@ properties:
       - adi,ad7381
       - adi,ad7383
       - adi,ad7384
+      - adi,ad7380-4
+      - adi,ad7381-4
+      - adi,ad7383-4
+      - adi,ad7384-4
 
   reg:
     maxItems: 1
@@ -56,6 +64,16 @@ properties:
       The common mode voltage supply for the AINB- pin on pseudo-differential
       chips.
 
+  ainc-supply:
+    description:
+      The common mode voltage supply for the AINC- pin on pseudo-differential
+      chips.
+
+  aind-supply:
+    description:
+      The common mode voltage supply for the AIND- pin on pseudo-differential
+      chips.
+
   interrupts:
     description:
       When the device is using 1-wire mode, this property is used to optionally
@@ -79,6 +97,8 @@ allOf:
           enum:
             - adi,ad7383
             - adi,ad7384
+            - adi,ad7383-4
+            - adi,ad7384-4
     then:
       required:
         - aina-supply
@@ -87,6 +107,20 @@ allOf:
       properties:
         aina-supply: false
         ainb-supply: false
+  - if:
+      properties:
+        compatible:
+          enum:
+            - adi,ad7383-4
+            - adi,ad7384-4
+    then:
+      required:
+        - ainc-supply
+        - aind-supply
+    else:
+      properties:
+        ainc-supply: false
+        aind-supply: false
 
 examples:
   - |