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of: of_mdio: Check if MDIO bus controller is available

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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.

Reviewed-by: Andrew Lunn <[email protected]>
Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Florian Fainelli 2016-04-28 16:24:12 -07:00 • committed by David S. Miller
commit a77f4f70fd
1 changed files with 4 additions and 0 deletions
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4
drivers/of/of_mdio.c
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@ -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 -ENODEV;
/* 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;