Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

MFC: r266270

Remove some unused variables.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Correct capitalization of "Hz" in user-visible text (manpages, printf(),
etc).

MFC after: 3 days

Rename device_delete_all_children() into device_delete_children().

Suggested by: jhb @ and marius @
MFC after: 1 week

Move the device_delete_all_children() function from usb_util.c
to kern/subr_bus.c. Simplify this function so that it no longer
depends on malloc() to execute. Identify a few other places where
it makes sense to use device_delete_all_children().

MFC after: 1 week

Do a sweep of the tree replacing calls to pci_find_extcap() with calls to
pci_find_cap() instead.

Revert r204992 and just wrap it all in ifdef INVARIANTS to fix the debug and
non-debug cases.

fixes a compile error if INVARIANTS is disabled.

Pointy hat to: me
Submitted by: Michael Butler <imb at protected-networks dot net>

o uses bus accessor macros to read values from ivar so no more values
are referenced directly from ivar pointer. It's to do like what other
buses do. [1]
o changes exported prototypes. It doesn't use struct siba_* structures
anymore that instead of it it uses only device_t.
o removes duplicate code and debug messages.
o style(9)

Pointed out by: imp [1]

fixes an attached-at-boot issue that bwn(4) using device_identify
interface didn't be attached automatically at boot time so changes a
approach to attach children based on leveraging some newbus niceties.

Submitted by: nwhitehorn

supports SPROM rev8 informations properly which are used to support
low-power PHY of bwn(4) and LDO voltage adjustments.

Adds siba_bwn module which is used with bwn(4). Main purpose of this
module is to distinguish parts of Silicon Backplane and of Broadcom
Wireless.