diff --git a/src/lib.rs b/src/lib.rs
index fb30191..5ad7ce3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -345,6 +345,11 @@
     pub fn is_compatible_to(&self, callee_version: &Version) -> bool {
         self.0 == callee_version.0 && self.1 <= callee_version.1
     }
+
+    /// Returns true if the specified FF-A version uses 18 registers for calls, false if it uses 8.
+    pub fn needs_18_regs(&self) -> bool {
+        *self >= Version(1, 2)
+    }
 }
 
 impl TryFrom<u32> for Version {
@@ -2432,6 +2437,12 @@
     use super::*;
 
     #[test]
+    fn version_reg_count() {
+        assert!(!Version(1, 1).needs_18_regs());
+        assert!(Version(1, 2).needs_18_regs())
+    }
+
+    #[test]
     fn part_info_get_regs() {
         let uuid = Uuid::parse_str("a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8").unwrap();
         let uuid_bytes = uuid.as_bytes();