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Some host controllers must be told about the hubs in a topology, not only about the device at the end of it. xHCI is one: a hub's slot context carries a hub flag, its downstream port count and the think time of its transaction translator, and the controller routes to anything behind that hub using them. The hub class driver already reads both values from the hub descriptor and keeps them privately. Publish them on the hub's own hub port, beside the speed and function address that already describe the device attached there. A driver setting up a device behind a hub finds them on that device's parent. They are written before the hub activates any downstream port, so they are in place before there is anything behind it, and a port with no hub reports zero ports because the hub class clears each child before use. Nothing is required to read them. Fields rather than a driver method: a method would need a null check at the call site and would define an order it must be called in. Both are inside CONFIG_USBHOST_HUB, as struct usbhost_hubport_s's parent pointer already is. Multi-TT is not included; it comes from the hub's interface protocol rather than its descriptor, and driving a multi-TT hub as single-TT costs bandwidth behind it but is correct. Assisted-by: Claude:claude-opus-5 Signed-off-by: Justin Hammond <justin@dynam.ac> |
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