On Thu, 17 Sep 2015, Tomeu Vizoso wrote: > Some buses (eg. AMBA) need access to some HW resources (it may need a > clock to be enabled so a device ID can be read) before a device can be > matched to a driver. > > The pre_probe callback allows the device-driver core to request the bus > to perform this initialization and can defer the probe if any of the > resources needed are missing. > > This gives us more flexibility when setting the order in which devices > are probed because the resources needed to get the matching information > don't need to be available by the time that the bus devices are > registered. Can't the subsystem do this itself in its matching routine? 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
