1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio-boardinfo.c b/drivers/net/phy/mdio-boardinfo.c
new file mode 100644
index 0000000000..2de679a681
--- /dev/null
+++ b/drivers/net/phy/mdio-boardinfo.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * mdio-boardinfo - Collect pre-declarations for MDIO devices
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+
+#include "mdio-boardinfo.h"
+
+static LIST_HEAD(mdio_board_list);
+static DEFINE_MUTEX(mdio_board_lock);
+
+/**
+ * mdiobus_setup_mdiodev_from_board_info - create and setup MDIO devices
+ * from pre-collected board specific MDIO information
+ * @bus: Bus the board_info belongs to
+ * @cb: Callback to create device on bus
+ * Context: can sleep
+ */
+void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus,
+					   int (*cb)
+					   (struct mii_bus *bus,
+					    struct mdio_board_info *bi))
+{
+	struct mdio_board_entry *be;
+	struct mdio_board_entry *tmp;
+	struct mdio_board_info *bi;
+	int ret;
+
+	mutex_lock(&mdio_board_lock);
+	list_for_each_entry_safe(be, tmp, &mdio_board_list, list) {
+		bi = &be->board_info;
+
+		if (strcmp(bus->id, bi->bus_id))
+			continue;
+
+		mutex_unlock(&mdio_board_lock);
+		ret = cb(bus, bi);
+		mutex_lock(&mdio_board_lock);
+		if (ret)
+			continue;
+
+	}
+	mutex_unlock(&mdio_board_lock);
+}
+EXPORT_SYMBOL(mdiobus_setup_mdiodev_from_board_info);
+
+/**
+ * mdiobus_register_board_info - register MDIO devices for a given board
+ * @info: array of devices descriptors
+ * @n: number of descriptors provided
+ * Context: can sleep
+ *
+ * The board info passed can be marked with __initdata but be pointers
+ * such as platform_data etc. are copied as-is
+ */
+int mdiobus_register_board_info(const struct mdio_board_info *info,
+				unsigned int n)
+{
+	struct mdio_board_entry *be;
+	unsigned int i;
+
+	be = kcalloc(n, sizeof(*be), GFP_KERNEL);
+	if (!be)
+		return -ENOMEM;
+
+	for (i = 0; i < n; i++, be++, info++) {
+		memcpy(&be->board_info, info, sizeof(*info));
+		mutex_lock(&mdio_board_lock);
+		list_add_tail(&be->list, &mdio_board_list);
+		mutex_unlock(&mdio_board_lock);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(mdiobus_register_board_info);