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-rw-r--r--Documentation/devicetree/bindings/usb/usb-device.txt33
1 files changed, 22 insertions, 11 deletions
diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt
index ce02cebac26a..1b27cebb47f4 100644
--- a/Documentation/devicetree/bindings/usb/usb-device.txt
+++ b/Documentation/devicetree/bindings/usb/usb-device.txt
@@ -4,24 +4,35 @@ Usually, we only use device tree for hard wired USB device.
The reference binding doc is from:
http://www.devicetree.org/open-firmware/bindings/usb/usb-1_0.ps
+
Required properties:
-- compatible: usbVID,PID. The textual representation of VID, PID shall
- be in lower case hexadecimal with leading zeroes suppressed. The
- other compatible strings from the above standard binding could also
- be used, but a device adhering to this binding may leave out all except
- for usbVID,PID.
-- reg: the port number which this device is connecting to, the range
- is 1-31.
+- compatible: "usbVID,PID", where VID is the vendor id and PID the product id.
+ The textual representation of VID and PID shall be in lower case hexadecimal
+ with leading zeroes suppressed. The other compatible strings from the above
+ standard binding could also be used, but a device adhering to this binding
+ may leave out all except for "usbVID,PID".
+- reg: the number of the USB hub port or the USB host-controller port to which
+ this device is attached. The range is 1-255.
+
+
+Required properties for hub nodes with device nodes:
+- #address-cells: shall be 1
+- #size-cells: shall be 0
-Example:
-&usb1 {
+Required properties for host-controller nodes with device nodes:
+- #address-cells: shall be 1
+- #size-cells: shall be 0
+
+
+Example:
+&usb1 { /* host controller */
#address-cells = <1>;
#size-cells = <0>;
- hub: genesys@1 {
+ hub@1 { /* hub connected to port 1 */
compatible = "usb5e3,608";
reg = <1>;
};
-}
+};