diff --git a/arch/arm/src/stm32f7/stm32_adc.c b/arch/arm/src/stm32f7/stm32_adc.c
index fa357867c84..c01db1e2b67 100644
--- a/arch/arm/src/stm32f7/stm32_adc.c
+++ b/arch/arm/src/stm32f7/stm32_adc.c
@@ -42,8 +42,10 @@
 
 #include <nuttx/config.h>
 
-#include <stdio.h>
 #include <sys/types.h>
+#include <sys/ioctl.h>
+
+#include <stdio.h>
 #include <stdint.h>
 #include <stdbool.h>
 #include <unistd.h>
@@ -166,6 +168,7 @@
 
 struct stm32_dev_s
 {
+  FAR const struct adc_callback_s *cb;
   uint8_t irq;          /* Interrupt generated by this ADC block */
   uint8_t nchannels;    /* Number of channels */
   uint8_t cchannels;    /* Number of configured channels */
@@ -227,11 +230,14 @@ static void     tim_dumpregs(FAR struct stm32_dev_s *priv,
 static void adc_rccreset(FAR struct stm32_dev_s *priv, bool reset);
 
 /* ADC Interrupt Handler */
+
 static int adc_interrupt(FAR struct adc_dev_s *dev);
 static int adc123_interrupt(int irq, FAR void *context);
 
 /* ADC Driver Methods */
 
+static int  adc_bind(FAR struct adc_dev_s *dev,
+                     FAR const struct adc_callback_s *callback);
 static void adc_reset(FAR struct adc_dev_s *dev);
 static int  adc_setup(FAR struct adc_dev_s *dev);
 static void adc_shutdown(FAR struct adc_dev_s *dev);
@@ -263,6 +269,7 @@ static void adc_startconv(FAR struct stm32_dev_s *priv, bool enable);
 
 static const struct adc_ops_s g_adcops =
 {
+  .ao_bind        = adc_bind,
   .ao_reset       = adc_reset,
   .ao_setup       = adc_setup,
   .ao_shutdown    = adc_shutdown,
@@ -1096,15 +1103,22 @@ static void adc_dmaconvcallback(DMA_HANDLE handle, uint8_t isr, FAR void *arg)
   FAR struct stm32_dev_s *priv = (FAR struct stm32_dev_s *)dev->ad_priv;
   int i;
 
-  for (i = 0; i < priv->nchannels; i++)
-    {
-      adc_receive(dev, priv->current, priv->dmabuffer[priv->current]);
-      priv->current++;
-      if (priv->current >= priv->nchannels)
-        {
-          /* Restart the conversion sequence from the beginning */
+  /* Verify that the upper-half driver has bound its callback functions */
 
-          priv->current = 0;
+  if (priv->cb != NULL)
+    {
+      DEBUGASSERT(priv->cb->au_receive != NULL);
+
+      for (i = 0; i < priv->nchannels; i++)
+        {
+          priv->cb->au_receive(dev, priv->current, priv->dmabuffer[priv->current]);
+          priv->current++;
+          if (priv->current >= priv->nchannels)
+            {
+              /* Restart the conversion sequence from the beginning */
+
+              priv->current = 0;
+            }
         }
     }
 
@@ -1115,6 +1129,25 @@ static void adc_dmaconvcallback(DMA_HANDLE handle, uint8_t isr, FAR void *arg)
 }
 #endif
 
+/****************************************************************************
+ * Name: adc_bind
+ *
+ * Description:
+ *   Bind the upper-half driver callbacks to the lower-half implementation.  This
+ *   must be called early in order to receive ADC event notifications.
+ *
+ ****************************************************************************/
+
+static int adc_bind(FAR struct adc_dev_s *dev,
+                    FAR const struct adc_callback_s *callback)
+{
+  FAR struct stm32_dev_s *priv = (FAR struct stm32_dev_s *)dev->ad_priv;
+
+  DEBUGASSERT(priv != NULL);
+  priv->cb = callback;
+  return OK;
+}
+
 /****************************************************************************
  * Name: adc_reset
  *
@@ -1138,7 +1171,7 @@ static void adc_reset(FAR struct adc_dev_s *dev)
   int ret;
 #endif
 
-  allvdbg("intf: %d\n", priv->intf);
+  allinfo("intf: %d\n", priv->intf);
   flags = enter_critical_section();
 
   /* Enable ADC reset state */
@@ -1559,15 +1592,21 @@ static int adc_interrupt(FAR struct adc_dev_s *dev)
 
       data = adc_getreg(priv, STM32_ADC_DR_OFFSET) & ADC_DR_RDATA_MASK;
 
-      /* Give the ADC data to the ADC driver.  adc_receive() accepts 3
-       * parameters:
-       *
-       * 1) The first is the ADC device instance for this ADC block.
-       * 2) The second is the channel number for the data, and
-       * 3) The third is the converted data for the channel.
-       */
+      /* Verify that the upper-half driver has bound its callback functions */
 
-      adc_receive(dev, priv->chanlist[priv->current], data);
+      if (priv->cb != NULL)
+        {
+          /* Give the ADC data to the ADC driver.  The ADC receive() method
+           * accepts 3 parameters:
+           *
+           * 1) The first is the ADC device instance for this ADC block.
+           * 2) The second is the channel number for the data, and
+           * 3) The third is the converted data for the channel.
+           */
+
+          DEBUGASSERT(priv->cb->au_receive != NULL);
+          priv->cb->au_receive(dev, priv->chanlist[priv->current], data);
+        }
 
       /* Set the channel number of the next channel that will complete
        * conversion.
@@ -1686,6 +1725,7 @@ struct adc_dev_s *stm32_adc_initialize(int intf, FAR const uint8_t *chanlist,
 
   DEBUGASSERT(cchannels <= ADC_MAX_SAMPLES);
 
+  priv->cb        = NULL;
   priv->cchannels = cchannels;
 
   memcpy(priv->chanlist, chanlist, cchannels);
diff --git a/arch/arm/src/stm32f7/stm32_i2c.c b/arch/arm/src/stm32f7/stm32_i2c.c
index 6d4793fda76..6aa9d2fde6d 100644
--- a/arch/arm/src/stm32f7/stm32_i2c.c
+++ b/arch/arm/src/stm32f7/stm32_i2c.c
@@ -2312,6 +2312,9 @@ static int stm32_i2c_process(FAR struct i2c_master_s *dev, FAR struct i2c_msg_s
              cr1, cr2,status );
     }
 
+  UNUSED(cr1);
+  UNUSED(cr2);
+
   i2cinfo("priv->status: 0x%08x\n", priv->status);
 
   /* Check for error status conditions */