On 17 September 2015 at 17:52, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > 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? That seems to work, thanks for the idea! Regards, Tomeu > Alan Stern > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- 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
