dt-bindings: usb: usb-nop-xceiv: Convert to DT schema

Convert the usb-nop-xceiv binding to DT schema.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210327202816.545282-1-robh@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt

-USB NOP PHY
-
-Required properties:
-- compatible: should be usb-nop-xceiv
-- #phy-cells: Must be 0
-
-Optional properties:
-- clocks: phandle to the PHY clock. Use as per Documentation/devicetree
-  /bindings/clock/clock-bindings.txt
-  This property is required if clock-frequency is specified.
-
-- clock-names: Should be "main_clk"
-
-- clock-frequency: the clock frequency (in Hz) that the PHY clock must
-  be configured to.
-
-- vcc-supply: phandle to the regulator that provides power to the PHY.
-
-- reset-gpios: Should specify the GPIO for reset.
-
-- vbus-detect-gpio: should specify the GPIO detecting a VBus insertion
-                    (see Documentation/devicetree/bindings/gpio/gpio.txt)
-- vbus-regulator : should specifiy the regulator supplying current drawn from
-  the VBus line (see Documentation/devicetree/bindings/regulator/regulator.txt).
-
-Example:
-
-	hsusb1_phy {
-		compatible = "usb-nop-xceiv";
-		clock-frequency = <19200000>;
-		clocks = <&osc 0>;
-		clock-names = "main_clk";
-		vcc-supply = <&hsusb1_vcc_regulator>;
-		reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
-		vbus-detect-gpio = <&gpio2 13 GPIO_ACTIVE_HIGH>;
-		vbus-regulator = <&vbus_regulator>;
-		#phy-cells = <0>;
-	};
-
-hsusb1_phy is a NOP USB PHY device that gets its clock from an oscillator
-and expects that clock to be configured to 19.2MHz by the NOP PHY driver.
-hsusb1_vcc_regulator provides power to the PHY and GPIO 7 controls RESET.
-GPIO 13 detects VBus insertion, and accordingly notifies the vbus-regulator.

Documentation/devicetree/bindings/usb/usb-nop-xceiv.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/usb-nop-xceiv.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: USB NOP PHY
+
+maintainers:
+  - Rob Herring <robh@kernel.org>
+
+properties:
+  compatible:
+    const: usb-nop-xceiv
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: main_clk
+
+  clock-frequency: true
+
+  '#phy-cells':
+    const: 0
+
+  vcc-supply:
+    description: phandle to the regulator that provides power to the PHY.
+
+  reset-gpios:
+    maxItems: 1
+
+  vbus-detect-gpio:
+    description: Should specify the GPIO detecting a VBus insertion
+    maxItems: 1
+
+  vbus-regulator:
+    description: Should specifiy the regulator supplying current drawn from
+      the VBus line.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - '#phy-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    hsusb1_phy {
+        compatible = "usb-nop-xceiv";
+        clock-frequency = <19200000>;
+        clocks = <&osc 0>;
+        clock-names = "main_clk";
+        vcc-supply = <&hsusb1_vcc_regulator>;
+        reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
+        vbus-detect-gpio = <&gpio2 13 GPIO_ACTIVE_HIGH>;
+        vbus-regulator = <&vbus_regulator>;
+        #phy-cells = <0>;
+    };
+
+...