diff --git a/cpu/samd5x/include/periph_cpu.h b/cpu/samd5x/include/periph_cpu.h
index e346efbefd..a7b39a952c 100644
--- a/cpu/samd5x/include/periph_cpu.h
+++ b/cpu/samd5x/include/periph_cpu.h
@@ -83,6 +83,19 @@ enum {
  */
 #define SPI_HWCS(x)     (UINT_MAX - 1)
 
+#ifndef DOXYGEN
+#define HAVE_ADC_RES_T
+typedef enum {
+    ADC_RES_6BIT  = 0xff,                       /**< not supported */
+    ADC_RES_8BIT  = ADC_CTRLB_RESSEL_8BIT,      /**< ADC resolution: 8 bit */
+    ADC_RES_10BIT = ADC_CTRLB_RESSEL_10BIT,     /**< ADC resolution: 10 bit */
+    ADC_RES_12BIT = ADC_CTRLB_RESSEL_12BIT,     /**< ADC resolution: 12 bit */
+    ADC_RES_14BIT = 0xfe,                       /**< not supported */
+    ADC_RES_16BIT = 0xfd                        /**< not supported */
+} adc_res_t;
+/** @} */
+#endif /* DOXYGEN */
+
 /**
  * @brief   The MCU has a 12 bit DAC
  */