[PATCH v3] net: airoha: bind MDIO controller on Ethernet load

[Christian Marangi]

Bind MDIO controller on Ethernet Controller load. The Airoha AN7581 SoC
have an integrated Switch based on MT7531 (or more saying MT7988).

Attach it to the mdio node in the switch node to support scanning for
MDIO devices on the BUS with DM API.

Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
 drivers/net/Kconfig      |  1 +
 drivers/net/airoha_eth.c | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index cee4a3fc9bd..ce7c7e6297e 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -126,6 +126,7 @@ config AIROHA_ETH
 	depends on ARCH_AIROHA
 	select PHYLIB
 	select DM_RESET
+	select MDIO_MT7531
 	help
 	  This Driver support Airoha Ethernet QDMA Driver
 	  Say Y to enable support for the Airoha Ethernet QDMA.
diff --git a/drivers/net/airoha_eth.c b/drivers/net/airoha_eth.c
index 6588eb3a806..d62c56e2563 100644
--- a/drivers/net/airoha_eth.c
+++ b/drivers/net/airoha_eth.c
@@ -10,6 +10,7 @@
 
 #include <dm.h>
 #include <dm/devres.h>
+#include <dm/lists.h>
 #include <mapmem.h>
 #include <net.h>
 #include <regmap.h>
@@ -971,6 +972,36 @@ static int arht_eth_write_hwaddr(struct udevice *dev)
 	return 0;
 }
 
+static int airoha_eth_bind(struct udevice *dev)
+{
+	ofnode switch_node, mdio_node;
+	struct udevice *mdio_dev;
+	int ret = 0;
+
+	if (!CONFIG_IS_ENABLED(MDIO_MT7531))
+		return 0;
+
+	switch_node = ofnode_by_compatible(ofnode_null(),
+					   "airoha,en7581-switch");
+	if (!ofnode_valid(switch_node)) {
+		debug("Warning: missing switch node\n");
+		return 0;
+	}
+
+	mdio_node = ofnode_find_subnode(switch_node, "mdio");
+	if (!ofnode_valid(mdio_node)) {
+		debug("Warning: missing mdio node\n");
+		return 0;
+	}
+
+	ret = device_bind_driver_to_node(dev, "mt7531-mdio", "mdio",
+					 mdio_node, &mdio_dev);
+	if (ret)
+		debug("Warning: failed to bind mdio controller\n");
+
+	return 0;
+}
+
 static const struct udevice_id airoha_eth_ids[] = {
 	{ .compatible = "airoha,en7581-eth" },
 	{ }
@@ -990,6 +1021,7 @@ U_BOOT_DRIVER(airoha_eth) = {
 	.id = UCLASS_ETH,
 	.of_match = airoha_eth_ids,
 	.probe = airoha_eth_probe,
+	.bind = airoha_eth_bind,
 	.ops = &airoha_eth_ops,
 	.priv_auto = sizeof(struct airoha_eth),
 	.plat_auto = sizeof(struct eth_pdata),
-- 
2.51.0