[PATCH/RFC 02/11] dt-bindings: usb: add usb role switch driver

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>]

This patch adds a new documentation for a usb role switch driver.
The usb role switch framework will parse this to get each device
pointer by using each remote-endpoint.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 .../devicetree/bindings/usb/usb-role-switch.txt    | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/usb-role-switch.txt

diff --git a/Documentation/devicetree/bindings/usb/usb-role-switch.txt b/Documentation/devicetree/bindings/usb/usb-role-switch.txt
new file mode 100644
index 0000000..941d582
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/usb-role-switch.txt
@@ -0,0 +1,42 @@
+USB role switch driver
+
+Optional nodes:
+- If a role switch driver has OF graph ports, the usb role switch framework
+  will parse the remote-endpoints in usb_role_switch_register(). The OF graph
+  port number as follows:
+    0: USB 2.0 host port
+    1: USB 3.0 host port
+    2: UDC port
+
+For example:
+	usb-role-sw {
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				usb2_host_sw0: endpoint {
+					remote-endpoint = <&usb2_host_ep0>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				usb3_host_sw0: endpoint {
+					remote-endpoint = <&usb3_host_ep0>;
+				};
+			};
+
+			port@2 {
+				reg = <2>;
+
+				udc_sw0: endpoint {
+					remote-endpoint = <&udc_ep0>;
+				};
+			};
+		};
+	};
-- 
1.9.1