Commit f877918c authored by Johan Hovold's avatar Johan Hovold Committed by Rob Herring
Browse files

dt-bindings: usb: document hub and host-controller properties



Hub nodes and host-controller nodes with child nodes must specify values
for #address-cells (1) and #size-cells (0).

Also make the definition of the related reg property a bit more
stringent, and add comments to the example source.
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent bfebcf54
......@@ -4,22 +4,34 @@ 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", 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 port number which this device is connecting to, the range
is 1-255.
- 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
Required properties for host-controller nodes with device nodes:
- #address-cells: shall be 1
- #size-cells: shall be 0
Example:
&usb1 {
&usb1 { /* host controller */
#address-cells = <1>;
#size-cells = <0>;
hub@1 {
hub@1 { /* hub connected to port 1 */
compatible = "usb5e3,608";
reg = <1>;
};
......
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