diff --git a/drivers/core/of_extra.c b/drivers/core/of_extra.c
index 632a1c2210..59ce9174ad 100644
--- a/drivers/core/of_extra.c
+++ b/drivers/core/of_extra.c
@@ -155,3 +155,15 @@ bool ofnode_phy_is_fixed_link(ofnode eth_node, ofnode *phy_node)
 
 	return true;
 }
+
+bool ofnode_eth_uses_inband_aneg(ofnode eth_node)
+{
+	bool inband_aneg = false;
+	const char *managed;
+
+	managed = ofnode_read_string(eth_node, "managed");
+	if (managed && !strcmp(managed, "in-band-status"))
+		inband_aneg = true;
+
+	return inband_aneg;
+}
diff --git a/include/dm/of_extra.h b/include/dm/of_extra.h
index f0d205491c..c2498aa585 100644
--- a/include/dm/of_extra.h
+++ b/include/dm/of_extra.h
@@ -114,4 +114,18 @@ int ofnode_decode_memory_region(ofnode config_node, const char *mem_type,
  */
 bool ofnode_phy_is_fixed_link(ofnode eth_node, ofnode *phy_node);
 
+/**
+ * ofnode_eth_uses_inband_aneg() - Detect whether MAC should use in-band autoneg
+ *
+ * This function detects whether the Ethernet controller should use IEEE 802.3
+ * clause 37 in-band autonegotiation for serial protocols such as 1000base-x,
+ * SGMII, USXGMII, etc. The property is relevant when the Ethernet controller
+ * is connected to an on-board PHY or an SFP cage, and is not relevant when it
+ * has a fixed link (in that case, in-band autoneg should not be used).
+ *
+ * @param eth_node	ofnode belonging to the Ethernet controller
+ * @return true if in-band autoneg should be used, false otherwise
+ */
+bool ofnode_eth_uses_inband_aneg(ofnode eth_node);
+
 #endif