MDIO_BUS_MUX can only be selected if OF_MDIO is already turned on:

WARNING: unmet direct dependencies detected for MDIO_BUS_MUX
  Depends on [n]: NETDEVICES [=y] && MDIO_BUS [=m] && OF_MDIO [=n]
  Selected by [m]:
  - MDIO_BUS_MUX_MULTIPLEXER [=m] && NETDEVICES [=y] && MDIO_BUS [=m] && OF [=y]

Fixes: 7865ad6551c9 ("drivers: net: phy: mdio-mux: Add support for Generic Mux 
controls")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/net/phy/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 7f66af446ec7..071869db44cf 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -89,7 +89,7 @@ config MDIO_BUS_MUX_MMIOREG
 
 config MDIO_BUS_MUX_MULTIPLEXER
        tristate "MDIO bus multiplexer using kernel multiplexer subsystem"
-       depends on OF
+       depends on OF_MDIO
        select MULTIPLEXER
        select MDIO_BUS_MUX
        help
-- 
2.20.0

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