dt-bindings: soc: rockchip: add rk3588 USB3 syscon

RK3588 USB3 support requires the GRF for USB, USBDP PHY and VO.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

Documentation/devicetree/bindings/soc/rockchip/grf.yaml

@@ -28,6 +28,9 @@ properties:
               - rockchip,rk3588-sys-grf
               - rockchip,rk3588-pcie3-phy-grf
               - rockchip,rk3588-pcie3-pipe-grf
+              - rockchip,rk3588-usb-grf
+              - rockchip,rk3588-usbdpphy-grf
+              - rockchip,rk3588-vo-grf
               - rockchip,rv1108-usbgrf
           - const: syscon
       - items:
@@ -64,6 +67,9 @@ properties:
   reg:
     maxItems: 1
 
+  clocks:
+    maxItems: 1
+
   "#address-cells":
     const: 1
 
@@ -245,6 +251,22 @@ allOf:
 
           unevaluatedProperties: false
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rockchip,rk3588-vo-grf
+
+    then:
+      required:
+        - clocks
+
+    else:
+      properties:
+        clocks: false
+
+
 examples:
   - |
     #include <dt-bindings/clock/rk3399-cru.h>