On Wed, 14 Aug 2013, Mark Brown wrote: > On Wed, Aug 14, 2013 at 10:27:26AM -0400, Alan Stern wrote: > > On Wed, 14 Aug 2013, Mark Brown wrote: > > > > I'd expect that we're just looking at hooks around connection and > > > disconnection here here - if we're looking at much more it seems like we > > > must be doing something wrong. > > > Connection and disconnection of what? > > The device on the bus. > > > In the example mentioned earlier, the GPIOs to power an on-board USB > > hub would have to be initialized when the host controller was started. > > You wouldn't want to wait for the on-board hub to be detected, because > > without those GPIOs set properly, it never would be discovered on the > > USB bus. Right? > > Yes, so you'd want callbacks when the device actually appears and > disappears. No, no -- this is exactly the point I was trying to make. The on-board hub _won't_ appear on the USB bus until the GPIOs are set. Therefore the callback to set the GPIOs needs to be at a different place, not when the device appears. > > Perhaps the platform-level code would need to hook into the places > > where the discoverable bus is registered and unregistered. > > We'd need some way to get information to the drivers still, and to > handle drivers that want to stop and start things. Um... What exactly does this mean? It's so generic, it could apply to anything under drivers/. After all, what driver doesn't want to stop and start things? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
