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Subject[PATCH net-next 1/2] of: mdio: Fall back to mdiobus_register() with np is NULL
When the Device Tree node specified is NULL, fall back to
mdiobus_register(). We have a number of drivers having a similar pattern
which is:

if (np)

so incorporate that behavior within the core of_mdiobus_register()
function. This is also consistent with the stub version that we defined
when CONFIG_OF=n.

Signed-off-by: Florian Fainelli <>
drivers/of/of_mdio.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 8c0c92712fc9..2341dbf675bf 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -204,6 +204,12 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
bool scanphys = false;
int addr, rc;

+ /* If the Device Tree node does not exist, fall back to traditional
+ * registration
+ */
+ if (!np)
+ return mdiobus_register(mdio);
/* Do not continue if the node is disabled */
if (!of_device_is_available(np))
return -ENODEV;
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