diff --git a/src/soc/intel/apollolake/spi.c b/src/soc/intel/apollolake/spi.c
index 9a651ee048..fecb0cfd26 100644
--- a/src/soc/intel/apollolake/spi.c
+++ b/src/soc/intel/apollolake/spi.c
@@ -16,8 +16,36 @@
 
 #include <console/console.h>
 #include <intelblocks/fast_spi.h>
+#include <intelblocks/spi.h>
+#include <soc/pci_devs.h>
 #include <spi-generic.h>
 
+int spi_soc_devfn_to_bus(unsigned int devfn)
+{
+	switch (devfn) {
+	case PCH_DEVFN_SPI0:
+		return 0;
+	case PCH_DEVFN_SPI1:
+		return 1;
+	case PCH_DEVFN_SPI2:
+		return 2;
+	}
+	return -1;
+}
+
+int spi_soc_bus_to_devfn(unsigned int bus)
+{
+	switch (bus) {
+	case 0:
+		return PCH_DEVFN_SPI0;
+	case 1:
+		return PCH_DEVFN_SPI1;
+	case 2:
+		return PCH_DEVFN_SPI2;
+	}
+	return -1;
+}
+
 const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
 	{ .ctrlr = &fast_spi_flash_ctrlr, .bus_start = 0, .bus_end = 0 },
 };