With posix timers having become optional, we get a build error with
the cpts time sync option of the CPSW driver:

drivers/net/ethernet/ti/cpts.c: In function 'cpts_find_ts':
drivers/net/ethernet/ti/cpts.c:291:23: error: implicit declaration of function 
'ptp_classify_raw';did you mean 'ptp_classifier_init'? 

This adds a hard dependency on PTP_CLOCK to avoid the problem, as
building it without PTP support makes no sense anyway.

Fixes: baa73d9e478f ("posix-timers: Make them configurable")
Cc: Nicolas Pitre <nicolas.pi...@linaro.org>
Cc: sta...@vger.kernel.org
Signed-off-by: Arnd Bergmann <a...@arndb.de>
v2: use 'depends on' instead of 'select' as suggested by Nico.
 drivers/net/ethernet/ti/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index d923890a9fda..9e631952b86f 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -76,7 +76,7 @@ config TI_CPSW
 config TI_CPTS
        bool "TI Common Platform Time Sync (CPTS) Support"
        depends on TI_CPSW || TI_KEYSTONE_NETCP
-       imply PTP_1588_CLOCK
+       depends on PTP_1588_CLOCK
          This driver supports the Common Platform Time Sync unit of
          the CPSW Ethernet Switch and Keystone 2 1g/10g Switch Subsystem.

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