v4.19.13 snapshot.
diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile
new file mode 100644
index 0000000..923c442
--- /dev/null
+++ b/drivers/ntb/hw/Makefile
@@ -0,0 +1,4 @@
+obj-$(CONFIG_NTB_AMD)	+= amd/
+obj-$(CONFIG_NTB_IDT)	+= idt/
+obj-$(CONFIG_NTB_INTEL)	+= intel/
+obj-$(CONFIG_NTB_SWITCHTEC) += mscc/