Messages in this thread | | | From | Tomeu Vizoso <> | Date | Fri, 18 Sep 2015 16:56:32 +0200 | Subject | Re: [PATCH v5 01/23] driver core: Add pre_probe callback to bus_type |
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On 17 September 2015 at 17:52, Alan Stern <stern@rowland.harvard.edu> 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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