diff --git a/arch/arm/src/stm32l4/stm32l4_pwr.c b/arch/arm/src/stm32l4/stm32l4_pwr.c
index a51e4ae829..71a3ad7afa 100644
--- a/arch/arm/src/stm32l4/stm32l4_pwr.c
+++ b/arch/arm/src/stm32l4/stm32l4_pwr.c
@@ -212,6 +212,68 @@ bool stm32l4_pwr_enableusv(bool set)
   return was_set;
 }
 
+/****************************************************************************
+ * Name: stm32l4_pwr_vddio2_valid
+ *
+ * Description:
+ *   Report that the Vddio2 independent I/Os supply voltage is valid or not.
+ *   Setting this bit is mandatory to use the PG2 - PG15 I/Os.
+ *
+ * Input Parameters:
+ *   set - True: Vddio2 is value; False: Vddio2 is not present.  Logical and
+ *         electrical isolation is applied to ignore this supply.
+ *
+ * Returned Value:
+ *   True: The bit was previously set.
+ *
+ ****************************************************************************/
+
+#if !defined(CONFIG_STM32L4_STM32L4X3)
+bool stm32l4_pwr_vddio2_valid(bool set)
+{
+  uint32_t regval;
+  bool was_set;
+  bool was_clk_enabled;
+
+  regval = getreg32(STM32L4_RCC_APB1ENR1);
+  was_clk_enabled = ((regval & RCC_APB1ENR1_PWREN) != 0);
+
+  if (!was_clk_enabled)
+    {
+      stm32l4_pwr_enableclk(true);
+    }
+
+  /* Get the current state of the STM32L4 PWR control register 2 */
+
+  regval  = stm32l4_pwr_getreg(STM32L4_PWR_CR2_OFFSET);
+  was_set = ((regval & PWR_CR2_IOSV) != 0);
+
+  /* Enable or disable the ability to write */
+
+  if (was_set && !set)
+    {
+      /* Reset the Vddio2 independent I/O supply valid bit. */
+
+      regval &= ~PWR_CR2_IOSV;
+      stm32l4_pwr_putreg(STM32L4_PWR_CR2_OFFSET, regval);
+    }
+  else if (!was_set && set)
+    {
+      /* Set the Vddio2 independent I/O supply valid bit. */
+
+      regval |= PWR_CR2_IOSV;
+      stm32l4_pwr_putreg(STM32L4_PWR_CR2_OFFSET, regval);
+    }
+
+  if (!was_clk_enabled)
+    {
+      stm32l4_pwr_enableclk(false);
+    }
+
+  return was_set;
+}
+#endif
+
 /****************************************************************************
  * Name: stm32_pwr_setvos
  *
diff --git a/arch/arm/src/stm32l4/stm32l4_pwr.h b/arch/arm/src/stm32l4/stm32l4_pwr.h
index dafe535d97..5d15397ca1 100644
--- a/arch/arm/src/stm32l4/stm32l4_pwr.h
+++ b/arch/arm/src/stm32l4/stm32l4_pwr.h
@@ -105,6 +105,25 @@ bool stm32l4_pwr_enablebkp(bool writable);
 
 bool stm32l4_pwr_enableusv(bool set);
 
+/****************************************************************************
+ * Name: stm32l4_pwr_vddio2_valid
+ *
+ * Description:
+ *   Report that the Vddio2 independent I/Os supply voltage is valid or not.
+ *   Setting this bit is mandatory to use the PG2 - PG15 I/Os.
+ *
+ * Input Parameters:
+ *   set - True: Vddio2 is value; False: Vddio2 is not present.  Logical and
+ *         electrical isolation is applied to ignore this supply.
+ *
+ * Returned Value:
+ *   True: The bit was previously set.
+ ****************************************************************************/
+
+#if !defined(CONFIG_STM32L4_STM32L4X3)
+bool stm32l4_pwr_vddio2_valid(bool set);
+#endif
+
 /****************************************************************************
  * Name: stm32_pwr_setvos
  *
diff --git a/arch/arm/src/stm32l5/stm32l5_pwr.c b/arch/arm/src/stm32l5/stm32l5_pwr.c
index 0a6f45edba..6d05fe5022 100644
--- a/arch/arm/src/stm32l5/stm32l5_pwr.c
+++ b/arch/arm/src/stm32l5/stm32l5_pwr.c
@@ -251,14 +251,14 @@ bool stm32l5_pwr_vddio2_valid(bool set)
 
   if (was_set && !set)
     {
-      /* Reset the Vddio2 invalid I/O supply valid bit. */
+      /* Reset the Vddio2 independent I/O supply valid bit. */
 
       regval &= ~PWR_CR2_IOSV;
       stm32l5_pwr_putreg(STM32L5_PWR_CR2_OFFSET, regval);
     }
   else if (!was_set && set)
     {
-      /* Set the Vddio2 invalid I/O supply valid bit. */
+      /* Set the Vddio2 independent I/O supply valid bit. */
 
       regval |= PWR_CR2_IOSV;
       stm32l5_pwr_putreg(STM32L5_PWR_CR2_OFFSET, regval);
diff --git a/boards/arm/stm32l5/nucleo-l552ze/src/stm32_boot.c b/boards/arm/stm32l5/nucleo-l552ze/src/stm32_boot.c
index a090e11067..f62e6b6f8a 100644
--- a/boards/arm/stm32l5/nucleo-l552ze/src/stm32_boot.c
+++ b/boards/arm/stm32l5/nucleo-l552ze/src/stm32_boot.c
@@ -42,7 +42,7 @@
  *
  * Description:
  *   All STM32 architectures must provide the following entry point.  This
- *   entry point is called early in the intitialization -- after all memory
+ *   entry point is called early in the initialization -- after all memory
  *   has been configured and mapped but before any devices have been
  *   initialized.
  *
diff --git a/boards/arm/stm32l5/stm32l562e-dk/src/stm32_boot.c b/boards/arm/stm32l5/stm32l562e-dk/src/stm32_boot.c
index 3d7ccb2096..0a343e1aaf 100644
--- a/boards/arm/stm32l5/stm32l562e-dk/src/stm32_boot.c
+++ b/boards/arm/stm32l5/stm32l562e-dk/src/stm32_boot.c
@@ -43,7 +43,7 @@
  *
  * Description:
  *   All STM32 architectures must provide the following entry point.  This
- *   entry point is called early in the intitialization -- after all memory
+ *   entry point is called early in the initialization -- after all memory
  *   has been configured and mapped but before any devices have been
  *   initialized.
  *