Add a boolean property indicating that a device is hardwired to the upstream port. Although hubs can provide this information, they are not always configured correctly. An alternate means of indicating this for built-in USB devices is thus useful. Signed-off-by: Mans Rullgard <mans@xxxxxxxxx> --- I have a situation where userspace would like to know which USB devices are built-in, but the on-board hub doesn't have the right setting. Also, the hub itself can't be indicated as fixed in any other way that I'm aware of. In a way, adding this property seems a bit silly since dt can only sensibly be used for hardwired devices in the first place. Thus the mere presence of a dt node could be taken to indicate the same thing. On the other hand, it's conceivable that someone might dynamically generate a devicetree based on what happens to be connected on boot or something. For that reason, and explicit property seems safer. --- Documentation/devicetree/bindings/usb/usb-device.txt | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt index 036be172b1ae..903d39b7e415 100644 --- a/Documentation/devicetree/bindings/usb/usb-device.txt +++ b/Documentation/devicetree/bindings/usb/usb-device.txt @@ -26,6 +26,10 @@ Required properties for device nodes: - 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. +Optional properties for device nodes: +- non-removable: boolean, if present the device is hardwired to the + upstream port. + Required properties for device nodes with interface nodes: - #address-cells: shall be 2 @@ -55,6 +59,10 @@ Required properties for combined nodes: - 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. +Optional properties for combined nodes: +- non-removable: boolean, if present the device is hardwired to the + upstream port. + Required properties for hub nodes with device nodes: - #address-cells: shall be 1 -- 2.20.1
