dt-bindings: phy: Convert img,pistachio-usb-phy to DT schema

Convert the Imagination Pistachio USB PHY binding to DT schema format.
It's a straight forward conversion.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/phy/img,pistachio-usb-phy.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/img,pistachio-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Imagination Pistachio USB PHY
+
+maintainers:
+  - Andrew Bresticker <[e-mail]>
+
+properties:
+  compatible:
+    const: img,pistachio-usb-phy
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: usb_phy
+
+  '#phy-cells':
+    const: 0
+
+  phy-supply:
+    description: USB VBUS supply. Must supply 5.0V.
+
+  img,refclk:
+    description:
+      Reference clock source for the USB PHY. See
+      <dt-bindings/phy/phy-pistachio-usb.h> for valid values.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  img,cr-top:
+    description: CR_TOP syscon phandle.
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - '#phy-cells'
+  - img,refclk
+  - img,cr-top
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/phy/phy-pistachio-usb.h>
+    #include <dt-bindings/clock/pistachio-clk.h>
+
+    usb-phy {
+        compatible = "img,pistachio-usb-phy";
+        clocks = <&clk_core CLK_USB_PHY>;
+        clock-names = "usb_phy";
+        #phy-cells = <0>;
+        phy-supply = <&usb_vbus>;
+        img,refclk = <REFCLK_CLK_CORE>;
+        img,cr-top = <&cr_top>;
+    };

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

···
-IMG Pistachio USB PHY
-=====================
-
-Required properties:
---------------------
- - compatible: Must be "img,pistachio-usb-phy".
- - #phy-cells: Must be 0.  See ./phy-bindings.txt for details.
- - clocks: Must contain an entry for each entry in clock-names.
-   See ../clock/clock-bindings.txt for details.
- - clock-names: Must include "usb_phy".
- - img,cr-top: Must contain a phandle to the CR_TOP syscon node.
- - img,refclk: Indicates the reference clock source for the USB PHY.
-   See <dt-bindings/phy/phy-pistachio-usb.h> for a list of valid values.
-
-Optional properties:
---------------------
- - phy-supply: USB VBUS supply.  Must supply 5.0V.
-
-Example:
---------
-usb_phy: usb-phy {
-	compatible = "img,pistachio-usb-phy";
-	clocks = <&clk_core CLK_USB_PHY>;
-	clock-names = "usb_phy";
-	phy-supply = <&usb_vbus>;
-	img,refclk = <REFCLK_CLK_CORE>;
-	img,cr-top = <&cr_top>;
-	#phy-cells = <0>;
-};