On Wed, Feb 07, 2007 at 02:15:08PM -0800, Simon White wrote:
> Hi,
>
> I've been working through trying to create a virtual
> bus.
How does this differ from a "real" bus?
> I've successfuly made it work for a single instance but wanted to
> confirm how to create multiple instances of the virtual bus.
Why would you need that?
> I believe to do this you have only one instance of your new
> bus_type registered but register multiple instances of struct device
> for it. I just wanted to confirm that was correct.
That would create multiple devices on the same bus. Is that what you
need to do?
> Lastly how do you walk over all devices on a bus
> instance?
You usually do this in your bus-specific code somehow.
> I note bus_for_each_dev but that appears to take a bus_type rather
> than struct device instance, hence I assume it will return all devices
> from all instances.
No, it will walk the bus that you created. If you need multiple busses,
create multiple 'struct bus_type' structures.
> I know I could compare each device to see if it is on a certain bus
> instance but wondered if there was a better way?
I think you will find that it works the way it is described.
Might I ask what you are trying to do with these multiple busses?
Note that you can have multiple trees of devices, all with the same
bus_type, yet not joined together in any other way. Odds are, you
probably want to do that, right?
thanks,
greg k-h
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