linux/include
Nicolas Pitre d1cbfd771c ptp_clock: Allow for it to be optional
In order to break the hard dependency between the PTP clock subsystem and
ethernet drivers capable of being clock providers, this patch provides
simple PTP stub functions to allow linkage of those drivers into the
kernel even when the PTP subsystem is configured out. Drivers must be
ready to accept NULL from ptp_clock_register() in that case.

And to make it possible for PTP to be configured out, the select statement
in those driver's Kconfig menu entries is converted to the new "imply"
statement. This way the PTP subsystem may have Kconfig dependencies of
its own, such as POSIX_TIMERS, without having to make those ethernet
drivers unavailable if POSIX timers are cconfigured out. And when support
for POSIX timers is selected again then the default config option for PTP
clock support will automatically be adjusted accordingly.

The pch_gbe driver is a bit special as it relies on extra code in
drivers/ptp/ptp_pch.c. Therefore we let the make process descend into
drivers/ptp/ even if PTP_1588_CLOCK is unselected.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Edward Cree <ecree@solarflare.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: linux-kbuild@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: Michal Marek <mmarek@suse.com>
Link: http://lkml.kernel.org/r/1478841010-28605-4-git-send-email-nicolas.pitre@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-11-16 09:26:34 +01:00
..
acpi Merge branches 'acpi-wdat' and 'acpi-cppc' 2016-10-21 22:24:23 +02:00
asm-generic Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
clocksource
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2016-10-10 11:19:47 +08:00
drm drm/crtc: constify drm_crtc_index parameter 2016-10-10 17:28:58 +02:00
dt-bindings Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2016-10-12 11:05:23 -07:00
keys
kvm ARM: KVM: Support vgic-v3 2016-09-22 13:22:21 +02:00
linux ptp_clock: Allow for it to be optional 2016-11-16 09:26:34 +01:00
math-emu
media Linux 4.8 2016-10-05 16:43:53 -03:00
memory
misc
net A single commit converting the mac80211 DocBook template over to Sphinx. 2016-10-14 14:11:22 -07:00
pcmcia
ras
rdma Merge of primary rdma-core code for 4.9 2016-10-09 17:04:33 -07:00
rxrpc rxrpc: Add tracepoint for ACK proposal 2016-09-23 15:49:19 +01:00
scsi Merge remote-tracking branch 'mkp-scsi/4.8/scsi-fixes' into fixes 2016-09-27 22:30:51 -07:00
soc powerpc updates for 4.9 2016-10-14 11:07:42 -07:00
sound ASoC: Updates for v4.9 2016-09-30 18:40:40 +02:00
target target: Make EXTENDED_COPY 0xe4 failure return COPY TARGET DEVICE NOT REACHABLE 2016-10-19 21:22:32 -07:00
trace Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2016-10-14 12:18:50 -07:00
uapi A small bug fix and a new driver for acting as an IPMI device. 2016-10-23 15:56:23 -07:00
video fbdev changes for 4.9 2016-10-12 11:01:37 -07:00
xen xen: features and fixes for 4.9-rc0 2016-10-06 11:19:10 -07:00
Kbuild