4 files changed, 8 insertions, 0 deletions
diff --git a/src/drivers/usb/Makefile.inc b/src/drivers/usb/Makefile.inc
index fa995c33cc..3c29545223 100644
--- a/src/drivers/usb/Makefile.inc
+++ b/src/drivers/usb/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 bootblock-$(CONFIG_USBDEBUG) += ehci_debug.c pci_ehci.c console.c gadget.c
 verstage-$(CONFIG_USBDEBUG) += ehci_debug.c console.c
 romstage-$(CONFIG_USBDEBUG) += ehci_debug.c pci_ehci.c console.c gadget.c
diff --git a/src/drivers/usb/acpi/Makefile.inc b/src/drivers/usb/acpi/Makefile.inc
index 2e111078ad..e525b466c9 100644
--- a/src/drivers/usb/acpi/Makefile.inc
+++ b/src/drivers/usb/acpi/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 ramstage-$(CONFIG_DRIVERS_USB_ACPI) += usb_acpi.c
diff --git a/src/drivers/usb/hub/Makefile.inc b/src/drivers/usb/hub/Makefile.inc
index a64d622a03..3222a81db3 100644
--- a/src/drivers/usb/hub/Makefile.inc
+++ b/src/drivers/usb/hub/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 ramstage-$(CONFIG_DRIVERS_USB_HUB) += acpi.c
diff --git a/src/drivers/usb/pci_xhci/Makefile.inc b/src/drivers/usb/pci_xhci/Makefile.inc
index 73f6b068a8..4f9187baa8 100644
--- a/src/drivers/usb/pci_xhci/Makefile.inc
+++ b/src/drivers/usb/pci_xhci/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
 ramstage-$(CONFIG_DRIVERS_USB_PCI_XHCI) += pci_xhci.c