Add deprecation notice to mly

share/man/man4/mly.4

@@ -47,6 +47,11 @@ module at boot time, place the following line in
 .Bd -literal -offset indent
 mly_load="YES"
 .Ed
+.Sh DEPRECATION NOTICE
+The
+.Nm
+driver is not present in
+.Fx 13.0 .
 .Sh DESCRIPTION
 The
 .Nm

sys/dev/mly/mly.c

@@ -336,6 +336,8 @@ mly_attach(device_t dev)
  out:
     if (error != 0)
 	mly_free(sc);
+    else
+	gone_in_dev(dev, 13, "mly(4) removed");
     return(error);
 }