dt-bindings: usb: atmel,at91rm9200-udc: convert to DT schema

Convert Atmel AT91 USB Device Controller (UDC) binding to DT schema.
Changes during conversion:
- Include "atmel,pullup-gpio" and "atmel,matrix" in the properties since
  they are required by existing in-tree DTS definitions.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
Link: https://patch.msgid.link/20260327-atmel-usb-v4-4-eb8b6e49b29d@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Charan-Pedumuru

Documentation/devicetree/bindings/usb/atmel,at91rm9200-udc.yaml

@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/atmel,at91rm9200-udc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel AT91 USB Device Controller (UDC)
+
+maintainers:
+  - Nicolas Ferre <nicolas.ferre@microchip.com>
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+
+description:
+  The Atmel AT91 USB Device Controller provides USB gadget (device-mode)
+  functionality on AT91 SoCs. It requires a peripheral clock and an AHB
+  clock for operation and may optionally control VBUS power through a GPIO.
+
+properties:
+  compatible:
+    enum:
+      - atmel,at91rm9200-udc
+      - atmel,at91sam9260-udc
+      - atmel,at91sam9261-udc
+      - atmel,at91sam9263-udc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: hclk
+
+  atmel,vbus-gpio:
+    description: GPIO used to enable or control VBUS power for the USB bus.
+    maxItems: 1
+
+  atmel,matrix:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Phandle to the Atmel bus matrix controller.
+
+  atmel,pullup-gpio:
+    description:
+      GPIO controlling the USB D+ pull-up resistor used to signal device
+      connection to the host.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/at91.h>
+    #include <dt-bindings/gpio/gpio.h>
+    gadget@fffa4000 {
+        compatible = "atmel,at91rm9200-udc";
+        reg = <0xfffa4000 0x4000>;
+        interrupts = <11 IRQ_TYPE_LEVEL_HIGH 2>;
+        clocks = <&udc_clk>, <&udpck>;
+        clock-names = "pclk", "hclk";
+        atmel,vbus-gpio = <&pioC 5 GPIO_ACTIVE_HIGH>;
+    };
+...

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

@@ -1,33 +1,5 @@
 Atmel SOC USB controllers
 
-AT91 USB device controller
-
-Required properties:
- - compatible: Should be one of the following
-	       "atmel,at91rm9200-udc"
-	       "atmel,at91sam9260-udc"
-	       "atmel,at91sam9261-udc"
-	       "atmel,at91sam9263-udc"
- - reg: Address and length of the register set for the device
- - interrupts: Should contain macb interrupt
- - clocks: Should reference the peripheral and the AHB clocks
- - clock-names: Should contain two strings
-		"pclk" for the peripheral clock
-		"hclk" for the AHB clock
-
-Optional properties:
- - atmel,vbus-gpio: If present, specifies a gpio that needs to be
-   activated for the bus to be powered.
-
-usb1: gadget@fffa4000 {
-	compatible = "atmel,at91rm9200-udc";
-	reg = <0xfffa4000 0x4000>;
-	interrupts = <10 4>;
-	clocks = <&udc_clk>, <&udpck>;
-	clock-names = "pclk", "hclk";
-	atmel,vbus-gpio = <&pioC 5 0>;
-};
-
 Atmel High-Speed USB device controller
 
 Required properties: