dt-bindings: iio: dac: ad5696: rework on power supplies

Add supplies for VDD, VLOGIC and VREF input voltage pins. The vcc-supply
property is deprecated, once it does not really exist as none of the
devices describe any power input with that name. VCC is also misleading as
it sounds like the input power supply, but it is being used as an external
voltage reference, which should be called VREF. Certain devices require
vref-supply to be available once an internal reference voltage is absent.
For correct operation vdd and vlogic supplies are required.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Documentation/devicetree/bindings/iio/dac/adi,ad5696.yaml

@@ -33,9 +33,22 @@ properties:
   reg:
     maxItems: 1
 
+  vdd-supply:
+    description: Input power supply.
+
+  vlogic-supply:
+    description:
+      Digital power supply. On some tiny package variants for single-channel
+      devices, this supply is internally connected to vdd; in that case, specify
+      this property with the same regulator as vdd.
+
+  vref-supply:
+    description:
+      Reference voltage supply. If not supplied the internal reference is used.
+
   vcc-supply:
-    description: |
-      The regulator supply for DAC reference voltage.
+    deprecated: true
+    description: Use vref-supply instead.
 
   reset-gpios:
     description: Active-low RESET pin to reset the device.
@@ -62,8 +75,21 @@ properties:
 required:
   - compatible
   - reg
+  - vdd-supply
+  - vlogic-supply
 
 allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - adi,ad5693
+              - adi,ad5694
+              - adi,ad5696
+    then:
+      required:
+        - vref-supply
   - if:
       properties:
         compatible:
@@ -90,7 +116,9 @@ examples:
       ad5696: dac@0 {
         compatible = "adi,ad5696";
         reg = <0>;
-        vcc-supply = <&dac_vref>;
+        vdd-supply = <&dac_vdd>;
+        vlogic-supply = <&dac_vlogic>;
+        vref-supply = <&dac_vref>;
         ldac-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
       };
     };