diff --git a/ports/arm/platforms/dm36x/dm36x-io.h b/ports/arm/platforms/dm36x/dm36x-io.h
index 9b1f42a..8883440 100644
--- a/ports/arm/platforms/dm36x/dm36x-io.h
+++ b/ports/arm/platforms/dm36x/dm36x-io.h
@@ -170,7 +170,12 @@
 #define DM36X_PSC_PDCTL1        0x304
 #define DM36X_PSC_MDSTAT_BASE   0x800
 #define DM36X_PSC_MDCTL_BASE    0xA00
+#define DM36X_PSC_MOD_SPI1      6
+#define DM36X_PSC_MOD_SPI2      11
 #define DM36X_PSC_MOD_I2C       18
+#define DM36X_PSC_MOD_SPI0      22
+#define DM36X_PSC_MOD_SPI3      38
+#define DM36X_PSC_MOD_SPI4      39
 
 
 /** I2C registers */