dt-bindings: usb: Add TI tps6598x device tree binding documentation

Add device tree binding documentation for the Texas Instruments tps6598x
Type-C chip driver.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20200507214733.1982696-2-bryan.odonoghue@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/ti,tps6598x.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/usb/ti,tps6598x.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Texas Instruments 6598x Type-C Port Switch and Power Delivery controller DT bindings
+
+maintainers:
+  - Bryan O'Donoghue <bryan.odonoghue@linaro.org>
+
+description: |
+  Texas Instruments 6598x Type-C Port Switch and Power Delivery controller
+
+properties:
+  compatible:
+    enum:
+      - ti,tps6598x
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    items:
+      - const: irq
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        tps6598x: tps6598x@38 {
+            compatible = "ti,tps6598x";
+            reg = <0x38>;
+
+            interrupt-parent = <&msmgpio>;
+            interrupts = <107 IRQ_TYPE_LEVEL_LOW>;
+            interrupt-names = "irq";
+
+            pinctrl-names = "default";
+            pinctrl-0 = <&typec_pins>;
+
+            typec_con: connector {
+                compatible = "usb-c-connector";
+                label = "USB-C";
+                port {
+                    typec_ep: endpoint {
+                        remote-endpoint = <&otg_ep>;
+                    };
+                };
+            };
+        };
+    };
+...