dt-bindings: phy: renesas,usb2-phy: Document USB VBUS regulator

Document the 'vbus-regulator' child node in the Renesas USB2 PHY binding
to describe the internal USB VBUS regulator.

Require this regulator node on OTG channels to accurately represent
hardware dependencies in the device tree.

Documenting this regulator allows device trees to model the VBUS power
requirements of these SoCs properly.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/aaa8044283eb736817afd43d4fba3aa93b50b1dd.1766405010.git.tommaso.merciai.xr@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Tommaso Merciai

Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml

@@ -89,6 +89,12 @@ properties:
       Phandle to a regulator that provides power to the VBUS. This regulator
       will be managed during the PHY power on/off sequence.
 
+  vbus-regulator:
+    $ref: /schemas/regulator/regulator.yaml#
+    description: USB VBUS internal regulator
+    type: object
+    unevaluatedProperties: false
+
   renesas,no-otg-pins:
     $ref: /schemas/types.yaml#/definitions/flag
     description: |