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net: macb: Use mdio child node for MDIO bus if it exists 

This allows explicitly specifying which children are present on the mdio
bus. Additionally, it allows for non-phy MDIO devices on the bus.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sean Anderson 2021-10-22 12:35:48 -04:00 committed by David S. Miller
parent 2579084400
commit 4d98bb0d7e
1 changed files with 11 additions and 0 deletions
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11
drivers/net/ethernet/cadence/macb_main.c
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@ -898,6 +898,17 @@ static int macb_mdiobus_register(struct macb *bp)
{
struct device_node *child, *np = bp->pdev->dev.of_node;
/* If we have a child named mdio, probe it instead of looking for PHYs
* directly under the MAC node
*/
child = of_get_child_by_name(np, "mdio");
if (np) {
int ret = of_mdiobus_register(bp->mii_bus, child);
of_node_put(child);
return ret;
}
if (of_phy_is_fixed_link(np))
return mdiobus_register(bp->mii_bus);