dt-bindings: usb: Add RK3588 OHCI

Add compatible for RK3588 OHCI. As far as I know it's fully
compatible with generic-ohci.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230522162937.53190-2-sebastian.reichel@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/generic-ohci.yaml

@@ -44,6 +44,7 @@ properties:
               - hpe,gxp-ohci
               - ibm,476gtr-ohci
               - ingenic,jz4740-ohci
+              - rockchip,rk3588-ohci
               - snps,hsdk-v1.0-ohci
           - const: generic-ohci
       - enum:
@@ -69,7 +70,7 @@ properties:
 
   clocks:
     minItems: 1
-    maxItems: 3
+    maxItems: 4
     description: |
       In case the Renesas R-Car Gen3 SoCs:
         - if a host only channel: first clock should be host.
@@ -147,6 +148,20 @@ allOf:
     then:
       properties:
         transceiver: false
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: rockchip,rk3588-ohci
+    then:
+      properties:
+        clocks:
+          minItems: 4
+    else:
+      properties:
+        clocks:
+          minItems: 1
+          maxItems: 3
 
 unevaluatedProperties: false