[PATCH net] net: micrel: Fix KS8851 Kconfig

[Horatiu Vultur]

KS8851 selects MICREL_PHY, which depends on PTP_1588_CLOCK_OPTIONAL, so
make KS8851 also depend on PTP_1588_CLOCK_OPTIONAL.

Fixes kconfig warning and build errors:

WARNING: unmet direct dependencies detected for MICREL_PHY
  Depends on [m]: NETDEVICES [=y] && PHYLIB [=y] && PTP_1588_CLOCK_OPTIONAL [=m]
    Selected by [y]:
      - KS8851 [=y] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_MICREL [=y] && SPI [=y]

ld.lld: error: undefined symbol: ptp_clock_register referenced by micrel.c
net/phy/micrel.o:(lan8814_probe) in archive drivers/built-in.a
ld.lld: error: undefined symbol: ptp_clock_index referenced by micrel.c
net/phy/micrel.o:(lan8814_ts_info) in archive drivers/built-in.a

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Fixes: ece19502834d ("net: phy: micrel: 1588 support for LAN8814 phy")
Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
---
 drivers/net/ethernet/micrel/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/micrel/Kconfig b/drivers/net/ethernet/micrel/Kconfig
index 1b632cdd7630..830363bafcce 100644
--- a/drivers/net/ethernet/micrel/Kconfig
+++ b/drivers/net/ethernet/micrel/Kconfig
@@ -28,6 +28,7 @@ config KS8842
 config KS8851
 	tristate "Micrel KS8851 SPI"
 	depends on SPI
+	depends on PTP_1588_CLOCK_OPTIONAL
 	select MII
 	select CRC32
 	select EEPROM_93CX6
-- 
2.33.0