[v3,02/12] dt-bindings: usb: add documentation for typec port controller(TCPCI)

[Jun Li <jun.li@nxp.com>]

TCPCI stands for typec port controller interface, its implementation
has full typec port control with power delivery support, it's a
standard i2c slave with GPIO input as irq interface, detail see spec
"Universal Serial Bus Type-C Port Controller Interface Specification
Revision 1.0, Version 1.1"

Signed-off-by: Li Jun <jun.li@nxp.com>
---
change for v3:
- change compatible string from "usb,tcpci" to be
  "usb-tcpci,chip-specific-string", update example of it.

 .../devicetree/bindings/usb/typec-tcpci.txt        | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/typec-tcpci.txt b/Documentation/devicetree/bindings/usb/typec-tcpci.txt
new file mode 100644
index 0000000..fe7d2ff
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/typec-tcpci.txt
@@ -0,0 +1,36 @@
+TCPCI(Typec port cotroller interface) binding
+---------------------------------------------
+
+Required properties:
+- compatible:       should be "usb-tcpci,chip-specific-string".
+- reg:              the i2c slave address of typec port controller device.
+- interrupt-parent: the phandle to the interrupt controller which provides
+                    the interrupt.
+- interrupts:       interrupt specification for tcpci alert.
+
+Required sub-node:
+- connector: The "usb-c-connector" attached to the tcpci chip, the bindings
+  of connector node are specified in
+  Documentation/devicetree/bindings/connector/usb-connector.txt
+
+Example:
+
+ptn5110@50 {
+	compatible = "usb-tcpci,ptn5110";
+	reg = <0x50>;
+	interrupt-parent = <&gpio3>;
+	interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+
+	usb_con: connector {
+		compatible = "usb-c-connector";
+		label = "USB-C";
+		port-type = "dual";
+		try-power-role = "sink"
+		source-pdos = <0x380190c8>;
+		sink-pdos = <0x380190c8 0x3802d0c8>;
+		max-sink-microvolt = <9000>;
+		max-sink-microamp = <2000>;
+		max-sink-microwatt-hours = <18000>;
+		op-sink-microwatt-hours = <9000>;
+	};
+};