diff --git a/src/mainboard/lenovo/t420s/devicetree.cb b/src/mainboard/lenovo/t420s/devicetree.cb
new file mode 100644
index 0000000..990b576
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/devicetree.cb
@@ -0,0 +1,172 @@
+chip northbridge/intel/sandybridge
+
+	# Enable DisplayPort Hotplug with 6ms pulse
+	register "gpu_dp_d_hotplug" = "0x06"
+
+	# Enable Panel as LVDS and configure power delays
+	register "gpu_panel_port_select" = "0"			# LVDS
+	register "gpu_panel_power_cycle_delay" = "1"
+	register "gpu_panel_power_up_delay" = "300"		# T1+T2: 30ms
+	register "gpu_panel_power_down_delay" = "300"		# T5+T6: 30ms
+	register "gpu_panel_power_backlight_on_delay" = "2000"	# T3: 200ms
+	register "gpu_panel_power_backlight_off_delay" = "2000"	# T4: 200ms
+	register "gfx.use_spread_spectrum_clock" = "1"
+	register "gfx.lvds_dual_channel" = "1"
+	register "gfx.link_frequency_270_mhz" = "1"
+	register "gfx.lvds_num_lanes" = "4"
+	register "gpu_cpu_backlight" = "0x1155"
+	register "gpu_pch_backlight" = "0x06100610"
+
+	device cpu_cluster 0 on
+		chip cpu/intel/socket_rPGA988B
+			device lapic 0 on end
+		end
+		chip cpu/intel/model_206ax
+			# Magic APIC ID to locate this chip
+			device lapic 0xACAC off end
+
+			# Coordinate with HW_ALL
+			register "pstate_coord_type" = "0xfe"
+
+			register "c1_acpower" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "c2_acpower" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "c3_acpower" = "5"	# ACPI(C3) = MWAIT(C7)
+
+			register "c1_battery" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "c2_battery" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "c3_battery" = "5"	# ACPI(C3) = MWAIT(C7)
+		end
+	end
+
+	device domain 0 on
+		device pci 00.0 on
+			subsystemid 0x17aa 0x21d2
+		end # host bridge
+		device pci 01.0 off end # NVIDIA Corporation GF119M [NVS 4200M]
+		device pci 02.0 on
+			subsystemid 0x17aa 0x21d3
+		end # Integrated Graphics Controller
+
+		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
+			# GPI routing
+			#  0 No effect (default)
+			#  1 SMI# (if corresponding ALT_GPI_SMI_EN bit is also set)
+			#  2 SCI (if corresponding GPIO_EN bit is also set)
+			register "alt_gp_smi_en" = "0x0000"
+			register "gpi1_routing" = "2"
+			register "gpi8_routing" = "2"
+
+			# Enable SATA ports 0 (HDD bay) & 1 (ODD bay) & 2 (mSATA) & 4 (dock)
+			register "sata_port_map" = "0x17"
+			# Set max SATA speed to 6.0 Gb/s
+			register "sata_interface_speed_support" = "0x3"
+
+			register "gen1_dec" = "0x7c1601"
+			register "gen2_dec" = "0x0c15e1"
+			register "gen4_dec" = "0x0c06a1"
+
+			register "pcie_hotplug_map" = "{ 0, 0, 0, 1, 0, 0, 0, 0 }"
+
+			# Enable zero-based linear PCIe root port functions
+			register "pcie_port_coalesce" = "1"
+
+			register "c2_latency" = "101"  # c2 not supported
+			register "p_cnt_throttling_supported" = "1"
+
+			device pci 16.0 off end # Management Engine Interface 1
+			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 0x21d2
+			end # USB Enhanced Host Controller #2
+			device pci 1b.0 on
+				subsystemid 0x17aa 0x21d2
+			end # High Definition Audio Controller
+			device pci 1c.0 off end # PCIe Port #1
+			device pci 1c.1 on
+				subsystemid 0x17aa 0x21d2
+			end # PCIe Port #2 Integrated Wireless LAN
+			device pci 1c.2 off end # PCIe Port #3
+			device pci 1c.3 on
+				subsystemid 0x17aa 0x21d2
+			end # PCIe Port #4 ExpressCard
+			device pci 1c.4 off end # PCIe Port #5
+			device pci 1c.5 off end # PCIe Port #6 Intel Gigabit Ethernet PHY (not PCIe)
+			device pci 1c.6 on
+				subsystemid 0x17aa 0x21d2
+			end # PCIe Port #7 NEC Corporation uPD720200A USB 3.0 Host Controller
+			device pci 1c.7 off end # PCIe Port #8
+			device pci 1d.0 on
+				subsystemid 0x17aa 0x21d2
+			end # USB Enhanced Host Controller #1
+			device pci 1e.0 off end # PCI bridge
+			device pci 1f.0 on
+				subsystemid 0x17aa 0x21d2
+				chip ec/lenovo/pmh7
+					device pnp ff.1 on # dummy
+					end
+					register "backlight_enable" = "0x01"
+					register "dock_event_enable" = "0x01"
+				end
+
+				chip ec/lenovo/h8
+					device pnp ff.2 on # dummy
+						io 0x60 = 0x62
+						io 0x62 = 0x66
+						io 0x64 = 0x1600
+						io 0x66 = 0x1604
+					end
+
+					register "config0" = "0xa7"
+					register "config1" = "0x01"
+					register "config2" = "0xa0"
+					register "config3" = "0xe2"
+
+					register "has_keyboard_backlight" = "0"
+
+					register "beepmask0" = "0x02"
+					register "beepmask1" = "0x86"
+					register "has_power_management_beeps" = "1"
+					register "event2_enable" = "0xff"
+					register "event3_enable" = "0xff"
+					register "event4_enable" = "0xf0"
+					register "event5_enable" = "0x3c"
+					register "event6_enable" = "0x00"
+					register "event7_enable" = "0xa1"
+					register "event8_enable" = "0x7b"
+					register "event9_enable" = "0xff"
+					register "eventa_enable" = "0x00"
+					register "eventb_enable" = "0x00"
+					register "eventc_enable" = "0xff"
+					register "eventd_enable" = "0xff"
+					register "evente_enable" = "0x0d"
+				end
+			end # LPC Controller
+			device pci 1f.2 on
+				subsystemid 0x17aa 0x21d2
+			end # 6 port SATA AHCI Controller
+			device pci 1f.3 on
+				subsystemid 0x17aa 0x21d2
+				# eeprom, 8 virtual devices, same chip
+				chip drivers/i2c/at24rf08c
+					device i2c 54 on end
+					device i2c 55 on end
+					device i2c 56 on end
+					device i2c 57 on end
+					device i2c 5c on end
+					device i2c 5d on end
+					device i2c 5e on end
+					device i2c 5f on end
+				end
+			end # SMBus Controller
+			device pci 1f.5 off end # SATA Controller 2
+			device pci 1f.6 on
+				subsystemid 0x17aa 0x21d2
+			end # Thermal
+		end
+	end
+end