dt-bindings: phy: add binding document for Allwinner F1C100s USB PHY

Allwinner F1C100s has the most simple USB PHY among all Allwinner SoCs,
because it has only one OTG USB controller, no host-only OHCI/EHCI
controllers.

Add a binding document for it. Following the current situation of one
YAML file per SoC, this one is based on
allwinner,sun8i-v3s-usb-phy.yaml, but with OHCI/EHCI-related bits
removed. (The same driver in Linux, phy-sun4i-usb, covers all these
binding files now.)

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20230109012223.4079299-2-andre.przywara@arm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/allwinner,suniv-f1c100s-usb-phy.yaml

@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/allwinner,suniv-f1c100s-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner F1C100s USB PHY
+
+maintainers:
+  - Chen-Yu Tsai <wens@csie.org>
+  - Maxime Ripard <mripard@kernel.org>
+
+properties:
+  "#phy-cells":
+    const: 1
+
+  compatible:
+    const: allwinner,suniv-f1c100s-usb-phy
+
+  reg:
+    maxItems: 1
+    description: PHY Control registers
+
+  reg-names:
+    const: phy_ctrl
+
+  clocks:
+    maxItems: 1
+    description: USB OTG PHY bus clock
+
+  clock-names:
+    const: usb0_phy
+
+  resets:
+    maxItems: 1
+    description: USB OTG reset
+
+  reset-names:
+    const: usb0_reset
+
+  usb0_id_det-gpios:
+    maxItems: 1
+    description: GPIO to the USB OTG ID pin
+
+  usb0_vbus_det-gpios:
+    maxItems: 1
+    description: GPIO to the USB OTG VBUS detect pin
+
+  usb0_vbus_power-supply:
+    description: Power supply to detect the USB OTG VBUS
+
+  usb0_vbus-supply:
+    description: Regulator controlling USB OTG VBUS
+
+required:
+  - "#phy-cells"
+  - compatible
+  - clocks
+  - clock-names
+  - reg
+  - reg-names
+  - resets
+  - reset-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/clock/suniv-ccu-f1c100s.h>
+    #include <dt-bindings/reset/suniv-ccu-f1c100s.h>
+
+    phy@1c13400 {
+        compatible = "allwinner,suniv-f1c100s-usb-phy";
+        reg = <0x01c13400 0x10>;
+        reg-names = "phy_ctrl";
+        clocks = <&ccu CLK_USB_PHY0>;
+        clock-names = "usb0_phy";
+        resets = <&ccu RST_USB_PHY0>;
+        reset-names = "usb0_reset";
+        #phy-cells = <1>;
+        usb0_id_det-gpios = <&pio 4 2 GPIO_ACTIVE_HIGH>;
+    };