Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r226173, r227843, r227848 and r227908:
Use DEVMETHOD_END to mark end of device methods.
Remove superfluous device methods.
Add some missing __FBSBID() macros.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

bus_add_child: change type of order parameter to u_int

This reflects actual type used to store and compare child device orders.
Change is mostly done via a Coccinelle (soon to be devel/coccinelle)
semantic patch.
Verified by LINT+modules kernel builds.

Followup to: r212213
MFC after: 10 days

strict kobj signatures: fix assortment of bus_read_ivar impls

Reviewed by: imp, current@
Approved by: jhb (mentor)

- Make SPI bus bridge be non-arch dependent by using more generic
name

Reviewed by: imp

MFp4: when passing the transfer up the foodchain, make sure we go up
the food chain. devi == NULL is the error condition. Treat it as such.

MFp4:
Initial spibus support. Seems to be OK, but needs some polish.

# someone should write a bit-bang spi parallel port interface :-)