diff --git a/include/dt-bindings/interrupt-controller/mchp-xec-ecia.h b/include/dt-bindings/interrupt-controller/mchp-xec-ecia.h
index 149625d7e4c..1acf552c859 100644
--- a/include/dt-bindings/interrupt-controller/mchp-xec-ecia.h
+++ b/include/dt-bindings/interrupt-controller/mchp-xec-ecia.h
@@ -6,6 +6,24 @@
 #ifndef __DT_BINDING_MCHP_XEC_ECIA_H
 #define __DT_BINDING_MCHP_XEC_ECIA_H
 
-#define MCHP_ECIA_DIRECT_BITMAP		0x00bfe000
+/*
+ * Encode peripheral interrupt information into a 32-bit unsigned.
+ * g  = bits[0:4], GIRQ number in [8, 26]
+ * gb = bits[12:8], peripheral source bit position [0, 31] in the GIRQ
+ * na = bits[23:16], aggregated GIRQ NVIC number
+ * nd = bits[31:24], direct NVIC number. For sources without a direct
+ *      connection nd = na.
+ * NOTE: GIRQ22 is a peripheral clock wake only. GIRQ22 and its sources
+ * are not connected to the NVIC. Use 255 for na and nd.
+ */
+#define MCHP_XEC_ECIA(g, gb, na, nd)					\
+	(((g) & 0x1f) + (((gb) & 0x1f) << 8) + (((na) & 0xff) << 16) +	\
+	(((nd) & 0xff) << 24))
+
+/* extract specific information from encoded MCHP_XEC_ECIA */
+#define MCHP_XEC_ECIA_GIRQ(e)		((e) & 0x1f)
+#define MCHP_XEC_ECIA_GIRQ_POS(e)	(((e) >> 8) & 0x1f)
+#define MCHP_XEC_ECIA_NVIC_AGGR(e)	(((e) >> 16) & 0xff)
+#define MCHP_XEC_ECIA_NVIC_DIRECT(e)	(((e) >> 24) & 0xff)
 
 #endif /* __DT_BINDING_MCHP_XEC_ECIA_H */