linux-kernel - [PATCH net-next v3 3/7] net: macb: parse PHY nodes found under an MDIO node

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Message-ID: <20200724105033.2124881-4-codrin.ciubotariu@microchip.com>
Date:   Fri, 24 Jul 2020 13:50:29 +0300
From:   Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
To:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <nicolas.ferre@...rochip.com>, <claudiu.beznea@...rochip.com>,
        <davem@...emloft.net>, <kuba@...nel.org>, <andrew@...n.ch>,
        <f.fainelli@...il.com>, <robh+dt@...nel.org>,
        <alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>,
        "Codrin Ciubotariu" <codrin.ciubotariu@...rochip.com>
Subject: [PATCH net-next v3 3/7] net: macb: parse PHY nodes found under an MDIO node

The MACB embeds an MDIO bus controller. For this reason, the PHY nodes
were represented as sub-nodes in the MACB node. Generally, the
Ethernet controller is different than the MDIO controller, so the PHYs
are probed by a separate MDIO driver. Since adding the PHY nodes directly
under the ETH node became deprecated, we adjust the MACB driver to look
for an MDIO node and register the subnode MDIO devices.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
---

Changes in v3:
 - moved the check for the mdio node at the beginnging of
   macb_mdiobus_register(). This way, the mdio devices will be probed even
   if macb is a fixed-link

Changes in v2:
 - readded newline removed by mistake;

 drivers/net/ethernet/cadence/macb_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 89fe7af5e408..cb0b3637651c 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -740,6 +740,16 @@ static int macb_mii_probe(struct net_device *dev)
 static int macb_mdiobus_register(struct macb *bp)
 {
 	struct device_node *child, *np = bp->pdev->dev.of_node;
+	struct device_node *mdio_node;
+	int ret;
+
+	/* if an MDIO node is present, it should contain the PHY nodes */
+	mdio_node = of_get_child_by_name(np, "mdio");
+	if (mdio_node) {
+		ret = of_mdiobus_register(bp->mii_bus, mdio_node);
+		of_node_put(mdio_node);
+		return ret;
+	}
 
 	if (of_phy_is_fixed_link(np))
 		return mdiobus_register(bp->mii_bus);
-- 
2.25.1