diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 14c7d73790b45627ec12a4b24bb024adf5527278..6da245dacca49e5a3d2cd828a8196857afe3c957 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -166,9 +166,45 @@ static const char *phylink_an_mode_str(unsigned int mode)
 	return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 }
 
+static int phylink_validate_any(struct phylink *pl, unsigned long *supported,
+				struct phylink_link_state *state)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(all_adv) = { 0, };
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(all_s) = { 0, };
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(s);
+	struct phylink_link_state t;
+	int intf;
+
+	for (intf = 0; intf < PHY_INTERFACE_MODE_MAX; intf++) {
+		if (test_bit(intf, pl->config->supported_interfaces)) {
+			linkmode_copy(s, supported);
+
+			t = *state;
+			t.interface = intf;
+			pl->mac_ops->validate(pl->config, s, &t);
+			linkmode_or(all_s, all_s, s);
+			linkmode_or(all_adv, all_adv, t.advertising);
+		}
+	}
+
+	linkmode_copy(supported, all_s);
+	linkmode_copy(state->advertising, all_adv);
+
+	return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
+}
+
 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 			    struct phylink_link_state *state)
 {
+	if (!phy_interface_empty(pl->config->supported_interfaces)) {
+		if (state->interface == PHY_INTERFACE_MODE_NA)
+			return phylink_validate_any(pl, supported, state);
+
+		if (!test_bit(state->interface,
+			      pl->config->supported_interfaces))
+			return -EINVAL;
+	}
+
 	pl->mac_ops->validate(pl->config, supported, state);
 
 	return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index bc4b866cd99b330d96c27b7840bcd26074631241..f037470b6fb33b65a01a9c22720c0a3c8990c0e2 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -67,6 +67,8 @@ enum phylink_op_type {
  * @ovr_an_inband: if true, override PCS to MLO_AN_INBAND
  * @get_fixed_state: callback to execute to determine the fixed link state,
  *		     if MAC link is at %MLO_AN_FIXED mode.
+ * @supported_interfaces: bitmap describing which PHY_INTERFACE_MODE_xxx
+ *                        are supported by the MAC/PCS.
  */
 struct phylink_config {
 	struct device *dev;
@@ -134,8 +136,14 @@ struct phylink_mac_ops {
  * based on @state->advertising and/or @state->speed and update
  * @state->interface accordingly. See phylink_helper_basex_speed().
  *
- * When @state->interface is %PHY_INTERFACE_MODE_NA, phylink expects the
- * MAC driver to return all supported link modes.
+ * When @config->supported_interfaces has been set, phylink will iterate
+ * over the supported interfaces to determine the full capability of the
+ * MAC. The validation function must not print errors if @state->interface
+ * is set to an unexpected value.
+ *
+ * When @config->supported_interfaces is empty, phylink will call this
+ * function with @state->interface set to %PHY_INTERFACE_MODE_NA, and
+ * expects the MAC driver to return all supported link modes.
  *
  * If the @state->interface mode is not supported, then the @supported
  * mask must be cleared.