dt-bindings: phy: st: convert phy-stih407-usb to DT schema

Convert the st,stih407-usb2-phy binding to DT schema format.
Signed-off-by: Raphael Gallais-Pou <rgallaispou@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230823132224.111326-1-rgallaispou@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/phy-stih407-usb.txt

-ST STiH407 USB PHY controller
-
-This file documents the dt bindings for the usb picoPHY driver which is the PHY for both USB2 and USB3
-host controllers (when controlling usb2/1.1 devices) available on STiH407 SoC family from STMicroelectronics.
-
-Required properties:
-- compatible		: should be "st,stih407-usb2-phy"
-- st,syscfg		: phandle of sysconfig bank plus integer array containing phyparam and phyctrl register offsets
-- resets		: list of phandle and reset specifier pairs. There should be two entries, one
-			  for the whole phy and one for the port
-- reset-names		: list of reset signal names. Should be "global" and "port"
-See: Documentation/devicetree/bindings/reset/st,stih407-powerdown.yaml
-See: Documentation/devicetree/bindings/reset/reset.txt
-
-Example:
-
-usb2_picophy0: usbpicophy@f8 {
-	compatible	= "st,stih407-usb2-phy";
-	#phy-cells	= <0>;
-	st,syscfg	= <&syscfg_core 0x100 0xf4>;
-	resets		= <&softreset STIH407_PICOPHY_SOFTRESET>,
-			  <&picophyreset STIH407_PICOPHY0_RESET>;
-	reset-names	= "global", "port";
-};

Documentation/devicetree/bindings/phy/st,stih407-usb2-phy.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/st,stih407-usb2-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STiH407 USB PHY controller
+
+maintainers:
+  - Patrice Chotard <patrice.chotard@foss.st.com>
+
+description:
+  The USB picoPHY device is the PHY for both USB2 and USB3 host controllers
+  (when controlling usb2/1.1 devices) available on STiH407 SoC family from
+  STMicroelectronics.
+
+properties:
+  compatible:
+    const: st,stih407-usb2-phy
+
+  st,syscfg:
+    description: Phandle to the syscfg bank
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to syscfg
+          - description: phyparam register offset
+          - description: phyctrl register offset
+
+  resets:
+    items:
+      - description: Phandle and reset specifier pair for the whole phy.
+      - description: Phandle and reset specifier pair for the port.
+
+  reset-names:
+    items:
+      - const: global
+      - const: port
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - st,syscfg
+  - resets
+  - reset-names
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/reset/stih407-resets.h>
+    usb-phy {
+        compatible = "st,stih407-usb2-phy";
+        #phy-cells = <0>;
+        st,syscfg = <&syscfg_core 0x100 0xf4>;
+        resets = <&softreset STIH407_PICOPHY_SOFTRESET>,
+                 <&picophyreset STIH407_PICOPHY0_RESET>;
+        reset-names = "global", "port";
+    };
+...