diff --git a/src/mainboard/lenovo/t420/devicetree.cb b/src/mainboard/lenovo/t420/devicetree.cb
index 6deff60..53bd16f 100644
--- a/src/mainboard/lenovo/t420/devicetree.cb
+++ b/src/mainboard/lenovo/t420/devicetree.cb
@@ -37,13 +37,11 @@
 	register "pci_mmio_size" = "2048"
 
 	device domain 0 on
-		device pci 00.0 on
-			subsystemid 0x17aa 0x21ce
-		end # host bridge
+		subsystemid 0x17aa 0x21ce inherit
+
+		device pci 00.0 on end # host bridge
 		device pci 01.0 on end # PCIe Bridge for discrete graphics
-		device pci 02.0 on
-			subsystemid 0x17aa 0x21ce
-		end # Integrated Graphics Controller
+		device pci 02.0 on end # Integrated Graphics Controller
 
 		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
 			# GPI routing
@@ -67,6 +65,7 @@
 
 			# Enable zero-based linear PCIe root port functions
 			register "pcie_port_coalesce" = "1"
+
 			register "c2_latency" = "101"  # c2 not supported
 
 			# device specific SPI configuration
@@ -77,46 +76,30 @@
 			device pci 16.1 off end # Management Engine Interface 2
 			device pci 16.2 off end # Management Engine IDE-R
 			device pci 16.3 off end # Management Engine KT
-			device pci 19.0 on
-				subsystemid 0x17aa 0x21ce
-			end # Intel Gigabit Ethernet
-			device pci 1a.0 on
-				subsystemid 0x17aa 0x21ce
-			end # USB Enhanced Host Controller #2
-			device pci 1b.0 on
-				subsystemid 0x17aa 0x21ce
-			end # High Definition Audio Controller
+			device pci 19.0 on end # Intel Gigabit Ethernet
+			device pci 1a.0 on end # USB Enhanced Host Controller #2
+			device pci 1b.0 on end # High Definition Audio Controller
 			device pci 1c.0 off end # PCIe Port #1
-			device pci 1c.1 on
-				subsystemid 0x17aa 0x21ce
-			end # PCIe Port #2 Integrated Wireless LAN
+			device pci 1c.1 on end # PCIe Port #2 Integrated Wireless LAN
 			device pci 1c.2 off end # PCIe Port #3
 			device pci 1c.3 on
-				subsystemid 0x17aa 0x21ce
 				smbios_slot_desc "7" "3" "ExpressCard Slot" "8"
 			end # PCIe Port #4 ExpressCard
 			device pci 1c.4 on
-				subsystemid 0x17aa 0x21ce
 				chip drivers/ricoh/rce822
 					register "sdwppol" = "1"
 					register "disable_mask" = "0x87"
-					device pci 00.0 on
-						subsystemid 0x17aa 0x21ce
-					end
+					device pci 00.0 on end
 				end
 			end # PCIe Port #5 (Ricoh SD & FW)
 			device pci 1c.5 off end # PCIe Port #6 Intel Gigabit Ethernet PHY (not PCIe)
 			device pci 1c.6 off end # PCIe Port #7
 			device pci 1c.7 off end # PCIe Port #8
-			device pci 1d.0 on
-				subsystemid 0x17aa 0x21ce
-			end # USB Enhanced Host Controller #1
+			device pci 1d.0 on end # USB Enhanced Host Controller #1
 			device pci 1e.0 off end # PCI bridge
 			device pci 1f.0 on
-				subsystemid 0x17aa 0x21ce
 				chip ec/lenovo/pmh7
-					device pnp ff.1 on # dummy
-					end
+					device pnp ff.1 on end # dummy
 					register "backlight_enable" = "0x01"
 					register "dock_event_enable" = "0x01"
 				end
@@ -176,11 +159,8 @@
 					register "has_thinker1" = "1"
 				end
 			end # LPC Controller
-			device pci 1f.2 on
-				subsystemid 0x17aa 0x21ce
-			end # 6 port SATA AHCI Controller
+			device pci 1f.2 on end # 6 port SATA AHCI Controller
 			device pci 1f.3 on
-				subsystemid 0x17aa 0x21ce
 				# eeprom, 8 virtual devices, same chip
 				chip drivers/i2c/at24rf08c
 					device i2c 54 on end
@@ -194,9 +174,7 @@
 				end
 			end # SMBus Controller
 			device pci 1f.5 off end # SATA Controller 2
-			device pci 1f.6 on
-				subsystemid 0x17aa 0x21ce
-			end # Thermal
+			device pci 1f.6 on end # Thermal
 		end
 	end
 end