[PATCH] net: ti: icssg-prueth: add PTP dependency

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

The driver can now use PTP if enabled but fails to link built-in
if PTP is a loadable module:

aarch64-linux-ld: drivers/net/ethernet/ti/icssg/icss_iep.o: in function `icss_iep_get_ptp_clock_idx':
icss_iep.c:(.text+0x200): undefined reference to `ptp_clock_index'

Add the usual dependency to avoid this.

Fixes: 186734c158865 ("net: ti: icssg-prueth: add packet timestamping and ptp support")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/net/ethernet/ti/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index 7f3e2e96c6e20..26ddc26fc7b8d 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -201,6 +201,7 @@ config TI_ICSSG_PRUETH
 
 config TI_ICSS_IEP
 	tristate "TI PRU ICSS IEP driver"
+	depends on PTP_1588_CLOCK_OPTIONAL
 	depends on TI_PRUSS
 	default TI_PRUSS
 	help
-- 
2.39.2