diff --git a/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb b/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb
index 8b1c68a367..a475202888 100644
--- a/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb
+++ b/src/mainboard/google/zork/variants/baseboard/devicetree_trembyle.cb
@@ -1,4 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD 0 3 end
+end
+
 chip soc/amd/picasso
 
 	# Set FADT Configuration
@@ -408,7 +413,8 @@ chip soc/amd/picasso
 								register "name" = ""MSTH""
 								register "uid" = "1"
 								register "desc" = ""Realtek RTD2141B""
-								device i2c 4a on end
+								# Device presence is variant-specific
+								device i2c 4a alias db_mst off end
 							end
 						end
 					end
diff --git a/src/mainboard/google/zork/variants/berknip/overridetree.cb b/src/mainboard/google/zork/variants/berknip/overridetree.cb
index fe2eadea61..793be783dc 100644
--- a/src/mainboard/google/zork/variants/berknip/overridetree.cb
+++ b/src/mainboard/google/zork/variants/berknip/overridetree.cb
@@ -1,4 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD
+		option BERKNIP_DB_PICASSO 0
+		option BERKNIP_DB_DALI 1
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -171,4 +179,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD BERKNIP_DB_DALI
+	end
+
 end	# chip soc/amd/picasso
diff --git a/src/mainboard/google/zork/variants/morphius/overridetree.cb b/src/mainboard/google/zork/variants/morphius/overridetree.cb
index cfc9cb3320..bb5e0e7c82 100644
--- a/src/mainboard/google/zork/variants/morphius/overridetree.cb
+++ b/src/mainboard/google/zork/variants/morphius/overridetree.cb
@@ -1,4 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD
+		option MORPHIUS_DB_PICASSO 0
+		option MORPHIUS_DB_DALI 1
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -136,4 +144,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD MORPHIUS_DB_DALI
+	end
+
 end	# chip soc/amd/picasso
diff --git a/src/mainboard/google/zork/variants/trembyle/overridetree.cb b/src/mainboard/google/zork/variants/trembyle/overridetree.cb
index a558aca00e..394b3bceb9 100644
--- a/src/mainboard/google/zork/variants/trembyle/overridetree.cb
+++ b/src/mainboard/google/zork/variants/trembyle/overridetree.cb
@@ -1,4 +1,13 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+
+fw_config
+	field USB_DAUGHTERBOARD
+		option TREMBYLE_DB_PICASSO 0
+		option TREMBYLE_DB_DALI 1
+		option TREMBYLE_DB_DALI_HDMI 2
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -104,4 +113,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD TREMBYLE_DB_DALI_HDMI
+	end
+
 end	# chip soc/amd/picasso
diff --git a/src/mainboard/google/zork/variants/woomax/overridetree.cb b/src/mainboard/google/zork/variants/woomax/overridetree.cb
index 20d4783a9b..82a060f7b7 100644
--- a/src/mainboard/google/zork/variants/woomax/overridetree.cb
+++ b/src/mainboard/google/zork/variants/woomax/overridetree.cb
@@ -1,5 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
+fw_config
+	field USB_DAUGHTERBOARD
+		option WOOMAX_DB_PICASSO 0
+		option WOOMAX_DB_DALI 1
+	end
+end
+
 chip soc/amd/picasso
 
 	# Start : OPN Performance Configuration
@@ -110,4 +117,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device ref db_mst on
+		probe USB_DAUGHTERBOARD WOOMAX_DB_DALI
+	end
+
 end	# chip soc/amd/picasso