dt-bindings: usb: generic-ohci: add AT91RM9200 OHCI binding support

Convert the Atmel AT91RM9200 OHCI USB host controller binding to DT schema
by defining it in the existing generic OHCI schema.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260327-atmel-usb-v4-2-eb8b6e49b29d@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Charan-Pedumuru

Documentation/devicetree/bindings/usb/atmel-usb.txt

@@ -1,32 +1,5 @@
 Atmel SOC USB controllers
 
-OHCI
-
-Required properties:
- - compatible: Should be "atmel,at91rm9200-ohci" for USB controllers
-   used in host mode.
- - reg: Address and length of the register set for the device
- - interrupts: Should contain ohci interrupt
- - clocks: Should reference the peripheral, host and system clocks
- - clock-names: Should contain three strings
-		"ohci_clk" for the peripheral clock
-		"hclk" for the host clock
-		"uhpck" for the system clock
- - num-ports: Number of ports.
- - atmel,vbus-gpio: If present, specifies a gpio that needs to be
-   activated for the bus to be powered.
- - atmel,oc-gpio: If present, specifies a gpio that needs to be
-   activated for the overcurrent detection.
-
-usb0: ohci@500000 {
-	compatible = "atmel,at91rm9200-ohci", "usb-ohci";
-	reg = <0x00500000 0x100000>;
-	clocks = <&uhphs_clk>, <&uhphs_clk>, <&uhpck>;
-	clock-names = "ohci_clk", "hclk", "uhpck";
-	interrupts = <20 4>;
-	num-ports = <2>;
-};
-
 EHCI
 
 Required properties:

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

@@ -55,6 +55,7 @@ properties:
           - ti,ohci-omap3
       - items:
           - enum:
+              - atmel,at91rm9200-ohci
               - cavium,octeon-6335-ohci
               - nintendo,hollywood-usb-ohci
               - nxp,ohci-nxp
@@ -137,13 +138,53 @@ properties:
       The associated ISP1301 device. Necessary for the UDC controller for
       connecting to the USB physical layer.
 
+  atmel,vbus-gpio:
+    description:
+      GPIO used to control or sense the USB VBUS power. Each entry
+      represents a VBUS-related GPIO; count and order may vary by hardware.
+      Entries follow standard GPIO specifier format. A value of 0 indicates
+      an unused or unavailable VBUS signal.
+    minItems: 1
+    maxItems: 3
+
+  atmel,oc-gpio:
+    description:
+      GPIO used to signal USB overcurrent condition. Each entry represents
+      an OC detection GPIO; count and order may vary by hardware. Entries
+      follow standard GPIO specifier format. A value of 0 indicates an
+      unused or unavailable OC signal.
+    minItems: 1
+    maxItems: 3
+
 required:
   - compatible
   - reg
   - interrupts
 
 allOf:
   - $ref: usb-hcd.yaml
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: atmel,at91rm9200-ohci
+    then:
+      properties:
+        clock-names:
+          items:
+            - const: ohci_clk
+            - const: hclk
+            - const: uhpck
+
+      required:
+        - clocks
+        - clock-names
+
+    else:
+      properties:
+        atmel,vbus-gpio: false
+        atmel,oc-gpio: false
+
   - if:
       not:
         properties: