linux-kernel - [net-next PATCH 2/2] net: macb: Use mdio child node for MDIO bus if it exists

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Date:   Fri, 22 Oct 2021 12:35:48 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     netdev@...r.kernel.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org,
        Sean Anderson <sean.anderson@...o.com>
Subject: [net-next PATCH 2/2] 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@...o.com>
---

 drivers/net/ethernet/cadence/macb_main.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 029dea2873e3..30a65cac9e87 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -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);
 
-- 
2.25.1