drivers/thunderbolt/Makefile - third_party/kernel - Git at Google

 # SPDX-License-Identifier: GPL-2.0-only
 obj-${CONFIG_USB4} := thunderbolt.o
 thunderbolt-objs := nhi.o nhi_ops.o ctl.o tb.o switch.o cap.o path.o tunnel.o eeprom.o
 thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o
 thunderbolt-objs += nvm.o retimer.o quirks.o

 thunderbolt-${CONFIG_ACPI} += acpi.o
 thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o
 thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o
	# SPDX-License-Identifier: GPL-2.0-only
	obj-${CONFIG_USB4} := thunderbolt.o
	thunderbolt-objs := nhi.o nhi_ops.o ctl.o tb.o switch.o cap.o path.o tunnel.o eeprom.o
	thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o
	thunderbolt-objs += nvm.o retimer.o quirks.o

	thunderbolt-${CONFIG_ACPI} += acpi.o
	thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o
	thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o