1 files changed, 27 insertions, 0 deletions
diff --git a/src/soc/intel/alderlake/spi.c b/src/soc/intel/alderlake/spi.c
new file mode 100644
index 0000000000..2940de1c12
--- /dev/null
+++ b/src/soc/intel/alderlake/spi.c
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * This file is created based on Intel Alder Lake Processor PCH Datasheet
+ * Document number: 621483
+ * Chapter number: 7
+ */
+
+#include <intelblocks/spi.h>
+#include <soc/pci_devs.h>
+
+int spi_soc_devfn_to_bus(unsigned int devfn)
+{
+	switch (devfn) {
+	case PCH_DEVFN_SPI:
+		return 0;
+	case PCH_DEVFN_GSPI0:
+		return 1;
+	case PCH_DEVFN_GSPI1:
+		return 2;
+	case PCH_DEVFN_GSPI2:
+		return 3;
+	case PCH_DEVFN_GSPI3:
+		return 4;
+	}
+	return -1;
+}