Commit a77f4f70 authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller

of: of_mdio: Check if MDIO bus controller is available

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: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3cfef195
...@@ -209,6 +209,10 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) ...@@ -209,6 +209,10 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
bool scanphys = false; bool scanphys = false;
int addr, rc; 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 /* Mask out all PHYs from auto probing. Instead the PHYs listed in
* the device tree are populated after the bus has been registered */ * the device tree are populated after the bus has been registered */
mdio->phy_mask = ~0; mdio->phy_mask = ~0;
......
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