dt-bindings: reset: renesas,rzg2l-usbphy-ctrl: Document RZ/G3S support

The Renesas USB PHY hardware block needs to have the PWRRDY bit in the
system controller set before applying any other settings. The PWRRDY bit
must be controlled during power-on, power-off, and system suspend/resume
sequences as follows:
- during power-on/resume, it must be set to zero before enabling clocks and
  modules
- during power-off/suspend, it must be set to one after disabling clocks
  and modules

Add the renesas,sysc-pwrrdy device tree property, which allows the
reset-rzg2l-usbphy-ctrl driver to parse, map, and control the system
controller PWRRDY bit at the appropriate time. Along with it add a new
compatible for the RZ/G3S SoC.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

Documentation/devicetree/bindings/reset/renesas,rzg2l-usbphy-ctrl.yaml

@@ -15,12 +15,14 @@ description:
 
 properties:
   compatible:
-    items:
+    oneOf:
+      - items:
           - enum:
               - renesas,r9a07g043-usbphy-ctrl # RZ/G2UL and RZ/Five
               - renesas,r9a07g044-usbphy-ctrl # RZ/G2{L,LC}
               - renesas,r9a07g054-usbphy-ctrl # RZ/V2L
           - const: renesas,rzg2l-usbphy-ctrl
+      - const: renesas,r9a08g045-usbphy-ctrl # RZ/G3S
 
   reg:
     maxItems: 1
@@ -48,6 +50,20 @@ properties:
     $ref: /schemas/regulator/regulator.yaml#
     unevaluatedProperties: false
 
+  renesas,sysc-pwrrdy:
+    description:
+      The system controller PWRRDY indicates to the USB PHY if the power supply
+      is ready. PWRRDY needs to be set during power-on before applying any
+      other settings. It also needs to be set before powering off the USB.
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description:
+              System controller phandle required by USB PHY CTRL driver to set
+              PWRRDY
+          - description: Register offset associated with PWRRDY
+          - description: Register bitmask associated with PWRRDY
+
 required:
   - compatible
   - reg
@@ -57,6 +73,19 @@ required:
   - '#reset-cells'
   - regulator-vbus
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a08g045-usbphy-ctrl
+    then:
+      required:
+        - renesas,sysc-pwrrdy
+    else:
+      properties:
+        renesas,sysc-pwrrdy: false
+
 additionalProperties: false
 
 examples: