On Mon, May 02, 2016 at 11:55:01AM +0100, Mark Brown wrote: > On Mon, May 02, 2016 at 11:49:12AM +0200, Krzysztof Kozlowski wrote: > > > This VDD regulator supply actually is not a usb3503 USB HUB regulator > > supply... but a supply to the LAN attached to this HUB. Regulator off/on > > is needed for LAN to show up. The hub will show up with typical reset > > (which is also missing before my patchset btw). > > > The LAN, as a USB device, is auto-probed so it cannot take the regulator > > and play with it. The simplest idea I have is to add it as "external > > supply" to the parent: usb3503. > > This is common enough that that just isn't going to scale well I fear > without some generic handling, either walking child devices at the bus > level or at the device level with a pre-probe() callback to get the > device to power on. The latter is more appropriate to things like > Slimbus where the device is more likely to do active management at > runtime, it's not clear people are building USB devices like that. There's a new binding and support in -next (.../usb/usb-device.txt) for USB devices that should help here. Though, how to handle a hub on USB and I2C buses would need to be worked out. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
