linux-kernel - [PATCH] net: macb: Fix handling of fixed-link node

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Date:   Tue, 31 Mar 2020 12:39:35 +0300
From:   Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <nicolas.ferre@...rochip.com>, <davem@...emloft.net>,
        <antoine.tenart@...tlin.com>, <andrew@...n.ch>,
        <f.fainelli@...il.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Cristian Birsan <cristian.birsan@...rochip.com>
Subject: [PATCH] net: macb: Fix handling of fixed-link node

fixed-link nodes are treated as PHY nodes by of_mdiobus_child_is_phy().
We must check if the interface is a fixed-link before looking up for PHY
nodes.

Fixes: 7897b071ac3b ("net: macb: convert to phylink")
Tested-by: Cristian Birsan <cristian.birsan@...rochip.com>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 2c28da1737fe..b3a51935e8e0 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -724,6 +724,9 @@ static int macb_mdiobus_register(struct macb *bp)
 {
 	struct device_node *child, *np = bp->pdev->dev.of_node;
 
+	if (of_phy_is_fixed_link(np))
+		return mdiobus_register(bp->mii_bus);
+
 	/* Only create the PHY from the device tree if at least one PHY is
 	 * described. Otherwise scan the entire MDIO bus. We do this to support
 	 * old device tree that did not follow the best practices and did not
-- 
2.20.1