diff --git a/src/mainboard/google/volteer/Kconfig b/src/mainboard/google/volteer/Kconfig
index 7ed685a8e5..63e70c5fc8 100644
--- a/src/mainboard/google/volteer/Kconfig
+++ b/src/mainboard/google/volteer/Kconfig
@@ -5,6 +5,7 @@ config BOARD_GOOGLE_BASEBOARD_VOLTEER
 	select DRIVERS_I2C_GENERIC
 	select DRIVERS_I2C_HID
 	select DRIVERS_I2C_SX9310
+	select DRIVERS_INTEL_PMC
 	select DRIVERS_INTEL_SOUNDWIRE
 	select DRIVERS_SPI_ACPI
 	select DRIVERS_SOUNDWIRE_ALC5682
diff --git a/src/mainboard/google/volteer/variants/volteer/overridetree.cb b/src/mainboard/google/volteer/variants/volteer/overridetree.cb
index aa2c8fb12f..d941f5fd2f 100644
--- a/src/mainboard/google/volteer/variants/volteer/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/volteer/overridetree.cb
@@ -21,5 +21,26 @@ chip soc/intel/tigerlake
 				end
 			end
 		end
+		device pci 1f.2 hidden
+			# The pmc_mux chip driver is a placeholder for the
+			# PMC.MUX device in the ACPI hierarchy.
+			chip drivers/intel/pmc_mux
+				device generic 0 on
+					chip drivers/intel/pmc_mux/con
+						register "usb2_port_number" = "9"
+						register "usb3_port_number" = "1"
+						# SBU & HSL follow CC
+						device generic 0 on end
+					end
+					chip drivers/intel/pmc_mux/con
+						register "usb2_port_number" = "4"
+						register "usb3_port_number" = "2"
+						# SBU is fixed, HSL follows CC
+						register "sbu_orientation" = "TYPEC_ORIENTATION_NORMAL"
+						device generic 1 on end
+					end
+				end
+			end
+		end # PMC
 	end
 end