diff --git a/arch/arm/src/sama5/chip/sam_pmc.h b/arch/arm/src/sama5/chip/sam_pmc.h
index 449abc489ff..222149d7c9b 100644
--- a/arch/arm/src/sama5/chip/sam_pmc.h
+++ b/arch/arm/src/sama5/chip/sam_pmc.h
@@ -420,7 +420,7 @@
 #define PMC_PCR_CMD                    (1 << 12) /* Bit 12: Command */
 
 #ifdef ATSAMA5D3
-#  define SAMA5_HAVE_PMC_PCR           1         /* Supports conditional compilation */
+#  define SAMA5_HAVE_PMC_PCR_DIV       1         /* Supports conditional compilation */
 #  define PMC_PCR_DIV_SHIFT            (16)      /* Bits 16-17: Divisor Value */
 #  define PMC_PCR_DIV_MASK             (3 << PMC_PCR_DIV_SHIFT)
 #    define PMC_PCR_DIV1               (0 << PMC_PCR_DIV_SHIFT) /* Peripheral clock is MCK */
diff --git a/arch/arm/src/sama5/sam_twi.c b/arch/arm/src/sama5/sam_twi.c
index 9d3e2f72c90..b5fc202c3a8 100644
--- a/arch/arm/src/sama5/sam_twi.c
+++ b/arch/arm/src/sama5/sam_twi.c
@@ -1169,6 +1169,8 @@ static void twi_hw_initialize(struct twi_dev_s *priv, unsigned int pid,
   mck = BOARD_MCK_FREQUENCY;
 
 #ifdef SAMA5_HAVE_PMC_PCR_DIV
+  /* Select the optimal value for the PCR DIV field */
+
   DEBUGASSERT((mck >> 3) <= TWI_MAX_FREQUENCY);
   if (mck <= TWI_MAX_FREQUENCY)
     {
@@ -1193,7 +1195,7 @@ static void twi_hw_initialize(struct twi_dev_s *priv, unsigned int pid,
 
 #else
   /* No DIV field in the PCR register */
- 
+
   priv->frequency     = mck;
   regval              = 0;