[PATCH] eth: fbnic: add CONFIG_PTP_1588_CLOCK_OPTIONAL dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

fbnic fails to link as built-in when PTP support is in a loadable
module:

aarch64-linux-ld: drivers/net/ethernet/meta/fbnic/fbnic_ethtool.o: in function `fbnic_get_ts_info':
fbnic_ethtool.c:(.text+0x428): undefined reference to `ptp_clock_index'
aarch64-linux-ld: drivers/net/ethernet/meta/fbnic/fbnic_time.o: in function `fbnic_time_start':
fbnic_time.c:(.text+0x820): undefined reference to `ptp_schedule_worker'
aarch64-linux-ld: drivers/net/ethernet/meta/fbnic/fbnic_time.o: in function `fbnic_ptp_setup':
fbnic_time.c:(.text+0xa68): undefined reference to `ptp_clock_register'

Add the appropriate dependency to enforce this.

Fixes: 6a2b3ede9543 ("eth: fbnic: add RX packets timestamping support")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/net/ethernet/meta/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/meta/Kconfig b/drivers/net/ethernet/meta/Kconfig
index 85519690b837..831921b9d4d5 100644
--- a/drivers/net/ethernet/meta/Kconfig
+++ b/drivers/net/ethernet/meta/Kconfig
@@ -23,6 +23,7 @@ config FBNIC
 	depends on !S390
 	depends on MAX_SKB_FRAGS < 22
 	depends on PCI_MSI
+	depends on PTP_1588_CLOCK_OPTIONAL
 	select NET_DEVLINK
 	select PAGE_POOL
 	select PHYLINK
-- 
2.39.5