Multiple device attachments

[Frank Zerangue <frank.zerangue%gmail.com@localhost>]

/sys/device.h -- seems to indicate that a device driver can attach to multiple 
parent
drivers (e.g. busses, controllers, …)

/*
 * Devices can have multiple configuration attachments if they attach
 * to different attributes (busses, or whatever), to allow specification
 * of multiple match and attach functions.  There is only one configuration
 * driver per driver, so that things like unit numbers and the device
 * structure array will be shared.
 */

Does anyone know how this is done in practice?

Frank