[PATCH v3 3/5] net: hifemac: register MDIO bus device for subnode

[Yang Xiwen via B4 Relay <devnull+forbidden405.outlook.com@kernel.org>]

From: Yang Xiwen <forbidden405@outlook.com>

register internal MDIO bus device if it is a subnode.

Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
---
 drivers/net/hifemac.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/net/hifemac.c b/drivers/net/hifemac.c
index 1088f3eca3..39c0233b62 100644
--- a/drivers/net/hifemac.c
+++ b/drivers/net/hifemac.c
@@ -15,6 +15,7 @@
 #include <wait_bit.h>
 #include <asm/io.h>
 #include <dm/device_compat.h>
+#include <dm/lists.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
 
@@ -337,6 +338,8 @@ int hisi_femac_of_to_plat(struct udevice *dev)
 {
 	int ret, i;
 	struct hisi_femac_priv *priv = dev_get_priv(dev);
+	ofnode mdio_node;
+	bool mdio_registered = false;
 	static const char * const clk_strs[] = {
 		[CLK_MAC] = "mac",
 		[CLK_BUS] = "bus",
@@ -388,6 +391,31 @@ int hisi_femac_of_to_plat(struct udevice *dev)
 						     MAC_RESET_DELAY_PROPERTY,
 						     MAC_RESET_ASSERT_PERIOD);
 
+	/* Create MDIO bus */
+	ofnode_for_each_subnode(mdio_node, dev_ofnode(dev)) {
+		const char *subnode_name = ofnode_get_name(mdio_node);
+		struct udevice *mdiodev;
+
+		// Skip subnodes not starting with "mdio"
+		if (strncmp(subnode_name, "mdio", 4))
+			continue;
+
+		ret = device_bind_driver_to_node(dev, "hisi-femac-mdio",
+						 subnode_name, mdio_node, &mdiodev);
+		if (ret) {
+			dev_err(dev, "Failed to register MDIO bus device %d\n", ret);
+			return log_msg_ret("net", ret);
+		}
+
+		mdio_registered = true;
+		break;
+	}
+
+	if (!mdio_registered) {
+		dev_err(dev, "No MDIO subnode is found!\n");
+		return log_msg_ret("mdio", -ENODATA);
+	}
+
 	return 0;
 }
 

-- 
2.43.0