On 13 July 2016 at 16:48, Jacek Anaszewski [off-list ref] wrote:

On 07/13/2016 02:42 PM, Rafał Miłecki wrote:

quoted

This allows specifying USB ports that should be observed by a trigger
right after activating it. Example:

usb {
        gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
        linux,default-trigger = "usbport";
        usb-controllers = <&ohci>, <&ehci>, <&xhci USB_HCD_SHARED>;
        usb-ports = "1", "1", "1";

Port is a numerical value, right?
Wouldn't it be better to define it as an array of integers?

e.g.: usb-ports = <1>. <1>, <1>;

Not always. Let me quote this part of "usbport" documentation:

This also allows handling devices with internal hubs (when root hub's port has
always a device (hub) connected). User can simply specify specify internal hub
ports then (e.g. 1-1.1, 1-1.2, etc.).

In such case we'd need usb-ports = "1.1", "1.2";

Anyway, there is a discussion ongoing in:
[PATCH V2 0/1] usb: add HCD providers
so let's see if someone will have a better idea for referencing USB
ports inside DT.
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