dt-bindings: usb: hd3ss3220 device tree binding document

Add device tree binding document for TI HD3SS3220 Type-C DRP port
controller driver.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1567584941-13690-2-git-send-email-biju.das@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/usb/ti,hd3ss3220.txt b/Documentation/devicetree/bindings/usb/ti,hd3ss3220.txt
new file mode 100644 (file)
index 0000000..25780e9
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ti,hd3ss3220.txt
@@ -0,0 +1,38 @@
+TI HD3SS3220 TypeC DRP Port Controller.
+
+Required properties:
+ - compatible: Must be "ti,hd3ss3220".
+ - reg: I2C slave address, must be 0x47 or 0x67 based on ADDR pin.
+ - interrupts: An interrupt specifier.
+
+Required sub-node:
+ - connector: The "usb-c-connector" attached to the hd3ss3220 chip. The
+   bindings of the connector node are specified in:
+
+       Documentation/devicetree/bindings/connector/usb-connector.txt
+
+Example:
+hd3ss3220@47 {
+       compatible = "ti,hd3ss3220";
+       reg = <0x47>;
+       interrupt-parent = <&gpio6>;
+       interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+
+       connector {
+               compatible = "usb-c-connector";
+               label = "USB-C";
+               data-role = "dual";
+
+               ports {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       port@1 {
+                               reg = <1>;
+                               hd3ss3220_ep: endpoint {
+                                       remote-endpoint = <&usb3_role_switch>;
+                               };
+                       };
+               };
+       };
+};