When CONFIG_PTP_1588_CLOCK is compiled as a module, then the linking of
the lan966x fails because it can't find references to the following
functions 'ptp_clock_index', 'ptp_clock_register' and
'ptp_clock_unregister'

The fix consists in adding CONFIG_PTP_1588_CLOCK_OPTIONAL as a
dependency for the driver.

Fixes: d096459494a887 ("net: lan966x: Add support for ptp clocks")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 drivers/net/ethernet/microchip/lan966x/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/Kconfig b/drivers/net/ethernet/microchip/lan966x/Kconfig
index ac273f84b69e..4241ff0e5098 100644
--- a/drivers/net/ethernet/microchip/lan966x/Kconfig
+++ b/drivers/net/ethernet/microchip/lan966x/Kconfig
@@ -1,5 +1,6 @@
 config LAN966X_SWITCH
 	tristate "Lan966x switch driver"
+	depends on PTP_1588_CLOCK_OPTIONAL
 	depends on HAS_IOMEM
 	depends on OF
 	depends on NET_SWITCHDEV
-- 
2.33.0

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sat, 12 Feb 2022 21:45:44 +0100 you wrote:
> When CONFIG_PTP_1588_CLOCK is compiled as a module, then the linking of
> the lan966x fails because it can't find references to the following
> functions 'ptp_clock_index', 'ptp_clock_register' and
> 'ptp_clock_unregister'
> 
> The fix consists in adding CONFIG_PTP_1588_CLOCK_OPTIONAL as a
> dependency for the driver.
> 
> [...]

Here is the summary with links:
  - [net-next] net: lan966x: Fix when CONFIG_PTP_1588_CLOCK is compiled as module
    https://git.kernel.org/netdev/net-next/c/1da52b0e4724

You are awesome, thank you!
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