diff --git a/arch/xtensa/src/esp32/esp32_rng.c b/arch/xtensa/src/esp32/esp32_rng.c
index f3cef48433..75397395d2 100644
--- a/arch/xtensa/src/esp32/esp32_rng.c
+++ b/arch/xtensa/src/esp32/esp32_rng.c
@@ -61,8 +61,6 @@
 static int esp32_rng_initialize(void);
 static ssize_t esp32_rng_read(struct file *filep, char *buffer,
                               size_t buflen);
-static int esp32_rng_open(struct file *filep);
-
 /****************************************************************************
  * Private Types
  ****************************************************************************/
@@ -81,7 +79,6 @@ static struct rng_dev_s g_rngdev;
 
 static const struct file_operations g_rngops =
 {
-  .open  = esp32_rng_open,       /* open */
   .read  = esp32_rng_read,       /* read */
 };
 
@@ -126,19 +123,9 @@ uint32_t IRAM_ATTR esp_random(void)
 }
 
 /****************************************************************************
- * Name: esp32_rng_open
+ * Name: esp32_rng_initialize
  ****************************************************************************/
 
-static void esp32_rng_start(void)
-{
-  /* Nothing to do, bootloader already did it */
-}
-
-static void esp32_rng_stop(void)
-{
-  /* Nothing to do */
-}
-
 static int esp32_rng_initialize(void)
 {
   static bool first_flag = true;
@@ -157,25 +144,6 @@ static int esp32_rng_initialize(void)
   nxsem_init(&g_rngdev.rd_sem, 0, 1);
   nxsem_set_protocol(&g_rngdev.rd_sem, SEM_PRIO_NONE);
 
-  esp32_rng_stop();
-
-  return OK;
-}
-
-/****************************************************************************
- * Name: esp32_rng_open
- ****************************************************************************/
-
-static int esp32_rng_open(struct file *filep)
-{
-  /* O_NONBLOCK is not supported */
-
-  if (filep->f_oflags & O_NONBLOCK)
-    {
-      _err("ESP32 RNG didn't support O_NONBLOCK mode.\n");
-      return -EPERM;
-    }
-
   return OK;
 }
 
@@ -197,9 +165,7 @@ static ssize_t esp32_rng_read(struct file *filep, char *buffer,
 
   read_len = buflen;
 
-  /* start RNG and Wait until the buffer is filled */
-
-  esp32_rng_start();
+  /* Wait until the buffer is filled */
 
   while (buflen > 0)
     {