bcm_sf2 does require the MDIO_BCM_UNIMAC driver which is now dependent
on OF_MDIO but also internally uses of_mdio.c provided routines which
are guarted with OF_MDIO.

Reported-by: kbuild test robot <fengguang...@intel.com>
Fixes: 90eff9096c01 ("net: phy: Allow splitting MDIO bus/device support from 
PHYs")
Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
 drivers/net/dsa/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index 065984670ff1..564b267c8428 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -11,7 +11,7 @@ config NET_DSA_MV88E6060
 
 config NET_DSA_BCM_SF2
        tristate "Broadcom Starfighter 2 Ethernet switch support"
-       depends on HAS_IOMEM && NET_DSA
+       depends on HAS_IOMEM && NET_DSA && OF_MDIO
        select NET_DSA_TAG_BRCM
        select FIXED_PHY
        select BCM7XXX_PHY
-- 
2.9.3

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