diff --git a/variants/feather_m0/variant.h b/variants/feather_m0/variant.h
index 09abe421..78340a92 100644
--- a/variants/feather_m0/variant.h
+++ b/variants/feather_m0/variant.h
@@ -146,6 +146,13 @@ static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;
 static const uint8_t SCK  = PIN_SPI_SCK ;
 
+#define SPI_HAS_DMA
+#define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
+#define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
+
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 /*
  * Wire Interfaces
  */
diff --git a/variants/feather_m0_express/variant.h b/variants/feather_m0_express/variant.h
index 916fdb58..115812a8 100644
--- a/variants/feather_m0_express/variant.h
+++ b/variants/feather_m0_express/variant.h
@@ -151,6 +151,13 @@ static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;
 static const uint8_t SCK  = PIN_SPI_SCK ;
 
+#define SPI_HAS_DMA
+#define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
+#define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
+
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 
 #define PIN_SPI1_MISO         (36u)
 #define PIN_SPI1_MOSI         (37u)
diff --git a/variants/feather_m4/variant.h b/variants/feather_m4/variant.h
index 3899bef2..05cd72aa 100644
--- a/variants/feather_m4/variant.h
+++ b/variants/feather_m4/variant.h
@@ -147,6 +147,9 @@ static const uint8_t SCK  = PIN_SPI_SCK ;
 #define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
 #define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
 
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 /*
  * Wire Interfaces
  */
diff --git a/variants/gemma_m0/variant.h b/variants/gemma_m0/variant.h
index 0c1aeedd..d97d9d5f 100644
--- a/variants/gemma_m0/variant.h
+++ b/variants/gemma_m0/variant.h
@@ -130,6 +130,13 @@ static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;
 static const uint8_t SCK  = PIN_SPI_SCK ;
 
+#define SPI_HAS_DMA
+#define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
+#define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
+
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 
 /*
  * Wire Interfaces
diff --git a/variants/itsybitsy_m0/variant.h b/variants/itsybitsy_m0/variant.h
index 7443f9de..3476fe12 100644
--- a/variants/itsybitsy_m0/variant.h
+++ b/variants/itsybitsy_m0/variant.h
@@ -145,6 +145,13 @@ static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;
 static const uint8_t SCK  = PIN_SPI_SCK ;
 
+#define SPI_HAS_DMA
+#define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
+#define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
+
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 
 #define PIN_SPI1_MISO         (36u)
 #define PIN_SPI1_MOSI         (37u)
diff --git a/variants/itsybitsy_m4/variant.h b/variants/itsybitsy_m4/variant.h
index 3d66e1d4..336aa783 100644
--- a/variants/itsybitsy_m4/variant.h
+++ b/variants/itsybitsy_m4/variant.h
@@ -142,6 +142,13 @@ static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;
 static const uint8_t SCK  = PIN_SPI_SCK ;
 
+#define SPI_HAS_DMA
+#define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
+#define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
+
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 /*
  * Wire Interfaces
  */
diff --git a/variants/metro_m0/variant.h b/variants/metro_m0/variant.h
index 08eb2ba9..3684caa8 100644
--- a/variants/metro_m0/variant.h
+++ b/variants/metro_m0/variant.h
@@ -155,6 +155,9 @@ static const uint8_t SCK  = PIN_SPI_SCK ;
 #define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
 #define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
 
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 #define PIN_SPI1_MISO         (36u)
 #define PIN_SPI1_MOSI         (37u)
 #define PIN_SPI1_SCK          (38u)
diff --git a/variants/metro_m4/variant.h b/variants/metro_m4/variant.h
index 218d6c51..8c5dcab0 100644
--- a/variants/metro_m4/variant.h
+++ b/variants/metro_m4/variant.h
@@ -147,6 +147,9 @@ static const uint8_t ATN = PIN_ATN;
 #define SPI_DMA_CHANNEL_RX	(DMAC_CH_NUM-2)
 #define SPI_DMA_CHANNEL_TX	(DMAC_CH_NUM-1)
 
+#define DMAC_RESERVED_CHANNELS ((1UL << SPI_DMA_CHANNEL_RX) | \
+								(1UL << SPI_DMA_CHANNEL_TX))
+
 static const uint8_t SS	  = PIN_A2 ;	
 static const uint8_t MOSI = PIN_SPI_MOSI ;
 static const uint8_t MISO = PIN_SPI_MISO ;