Add a check whether the 'struct device_node' pointer passed to
of_mdiobus_register() is an available (aka enabled) node in the Device
Tree.
Rationale for doing this are cases where an Ethernet MAC provides a MDIO
bus controller and node, and an additional Ethernet MAC might be
connecting its PHY/switches to that first MDIO bus controller, while
still embedding one internally which is therefore marked as "disabled".
Instead of sprinkling checks like these in callers of
of_mdiobus_register(), do this in a central location.
Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
---
drivers/of/of_mdio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index b622b33dbf93..2f497790be1b 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -209,6 +209,10 @@ int of_mdiobus_register(struct mii_bus *mdio, struct
device_node *np)
bool scanphys = false;
int addr, rc;
+ /* Do not continue if the node is disabled */
+ if (!of_device_is_available(np))
+ return -EINVAL;
+
/* Mask out all PHYs from auto probing. Instead the PHYs listed in
* the device tree are populated after the bus has been registered */
mdio->phy_mask = ~0;
--
2.1.0
