Commit e23c0d21 authored by Andrew Halaney's avatar Andrew Halaney Committed by Paolo Abeni
Browse files

net: stmmac: Handle disabled MDIO busses from devicetree 



Many hardware configurations have the MDIO bus disabled, and are instead
using some other MDIO bus to talk to the MAC's phy.

of_mdiobus_register() returns -ENODEV in this case. Let's handle it
gracefully instead of failing to probe the MAC.

Fixes: 47dd7a54 ("net: add support for STMicroelectronics Ethernet controllers.")
Signed-off-by: default avatarAndrew Halaney <ahalaney@redhat.com>
Reviewed-by: default avatarSerge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20231212-b4-stmmac-handle-mdio-enodev-v2-1-600171acf79f@redhat.com


Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 981d947b

drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

+5 −1
Original line number Diff line number Diff line
@@ -591,7 +591,11 @@ int stmmac_mdio_register(struct net_device *ndev) 
	new_bus->parent = priv->device;



	err = of_mdiobus_register(new_bus, mdio_node);

	if (err != 0) {

	if (err == -ENODEV) {

		err = 0;

		dev_info(dev, "MDIO bus is disabled\n");

		goto bus_register_fail;

	} else if (err) {

		dev_err_probe(dev, err, "Cannot register the MDIO bus\n");

		goto bus_register_fail;

	}