dt-bindings: input: HID: i2c-hid: Introduce bindings for the Goodix GT7375P

This adds new bindings for the Goodix GT7375P touchscreen.  While this
touchscreen's communications are based on the generic "i2c-over-hid"
protocol, it needs special power sequencing and thus gets its own
compatible and bindings.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

Documentation/devicetree/bindings/input/goodix,gt7375p.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/goodix,gt7375p.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Goodix GT7375P touchscreen
+
+maintainers:
+  - Douglas Anderson <dianders@chromium.org>
+
+description:
+  Supports the Goodix GT7375P touchscreen.
+  This touchscreen uses the i2c-hid protocol but has some non-standard
+  power sequencing required.
+
+properties:
+  compatible:
+    items:
+      - const: goodix,gt7375p
+
+  reg:
+    enum:
+      - 0x5d
+      - 0x14
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    true
+
+  vdd-supply:
+    description: The 3.3V supply to the touchscreen.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - reset-gpios
+  - vdd-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,rpmh.h>
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ap_ts: touchscreen@5d {
+        compatible = "goodix,gt7375p";
+        reg = <0x5d>;
+
+        interrupt-parent = <&tlmm>;
+        interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
+
+        reset-gpios = <&tlmm 8 GPIO_ACTIVE_LOW>;
+        vdd-supply = <&pp3300_ts>;
+      };
+    };