diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index 81f68e2314..a1c8ae3e04 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -104,6 +104,9 @@ chip soc/intel/elkhartlake
 	register "PchTsnGbeSgmiiEnable" = "1"
 	register "PseDmaOwn[0]" = "Host_Owned"
 	register "PseDmaOwn[1]" = "Host_Owned"
+	register "pch_tsn_phy_irq_edge" = "RISING_EDGE"
+	register "pse_tsn_phy_irq_edge[0]" = "RISING_EDGE"
+	register "pse_tsn_phy_irq_edge[1]" = "RISING_EDGE"
 
 	register "common_soc_config" = "{
 		.i2c[2] = {