dt-bindings: mfd: maxim,max77759: reference power-supply schema and add regulator property

Extend the max77759 binding to reference power-supply schema, so that
PMIC node can reference its supplier. Also, add regulator property to
control CHGIN (OTG) voltage.

Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20260325-max77759-charger-v9-1-4486dd297adc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/mfd/maxim,max77759.yaml

@@ -16,6 +16,9 @@ description: |
   The MAX77759 includes Battery Charger, Fuel Gauge, temperature sensors, USB
   Type-C Port Controller (TCPC), NVMEM, and a GPIO expander.
 
+allOf:
+  - $ref: /schemas/power/supply/power-supply.yaml#
+
 properties:
   compatible:
     const: maxim,max77759
@@ -37,12 +40,18 @@ properties:
   nvmem-0:
     $ref: /schemas/nvmem/maxim,max77759-nvmem.yaml
 
+  chgin-otg-regulator:
+    type: object
+    description: Provides Boost for sourcing VBUS.
+    $ref: /schemas/regulator/regulator.yaml#
+    unevaluatedProperties: false
+
 required:
   - compatible
   - interrupts
   - reg
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |
@@ -59,6 +68,11 @@ examples:
 
             interrupt-controller;
             #interrupt-cells = <2>;
+            power-supplies = <&maxtcpci>;
+
+            chgin-otg-regulator {
+                regulator-name = "chgin-otg";
+            };
 
             gpio {
                 compatible = "maxim,max77759-gpio";