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ptp_clock: Allow for it to be optional

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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 <[email protected]>
Acked-by: Richard Cochran <[email protected]>
Acked-by: Edward Cree <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Acked-by: John Stultz <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
Cc: Paul Bolle <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Michal Marek <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Nicolas Pitre 2016-11-11 00:10:07 -05:00 • committed by Thomas Gleixner
commit d1cbfd771c
18 changed files with 69 additions and 50 deletions
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8
drivers/ptp/Kconfig
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@ -28,7 +28,7 @@ config PTP_1588_CLOCK
config PTP_1588_CLOCK_GIANFAR
tristate "Freescale eTSEC as PTP clock"
depends on GIANFAR
select PTP_1588_CLOCK
depends on PTP_1588_CLOCK
default y
help
This driver adds support for using the eTSEC as a PTP
@ -42,7 +42,7 @@ config PTP_1588_CLOCK_GIANFAR
config PTP_1588_CLOCK_IXP46X
tristate "Intel IXP46x as PTP clock"
depends on IXP4XX_ETH
select PTP_1588_CLOCK
depends on PTP_1588_CLOCK
default y
help
This driver adds support for using the IXP46X as a PTP
@ -60,7 +60,7 @@ config DP83640_PHY
tristate "Driver for the National Semiconductor DP83640 PHYTER"
depends on NETWORK_PHY_TIMESTAMPING
depends on PHYLIB
select PTP_1588_CLOCK
depends on PTP_1588_CLOCK
---help---
Supports the DP83640 PHYTER with IEEE 1588 features.
@ -76,7 +76,7 @@ config PTP_1588_CLOCK_PCH
tristate "Intel PCH EG20T as PTP clock"
depends on X86_32 || COMPILE_TEST
depends on HAS_IOMEM && NET
select PTP_1588_CLOCK
imply PTP_1588_CLOCK
help
This driver adds support for using the PCH EG20T as a PTP
clock. The hardware supports time stamping of PTP packets