diff --git a/arch/risc-v/src/esp32c3/esp32c3_rng.c b/arch/risc-v/src/esp32c3/esp32c3_rng.c
index 54ad30297d..7a3d01c689 100644
--- a/arch/risc-v/src/esp32c3/esp32c3_rng.c
+++ b/arch/risc-v/src/esp32c3/esp32c3_rng.c
@@ -59,7 +59,6 @@
 static int esp32c3_rng_initialize(void);
 static ssize_t esp32c3_rng_read(struct file *filep, char *buffer,
                                 size_t buflen);
-static int esp32c3_rng_open(struct file *filep);
 
 /****************************************************************************
  * Private Types
@@ -79,7 +78,6 @@ static struct rng_dev_s g_rngdev;
 
 static const struct file_operations g_rngops =
 {
-  .open  = esp32c3_rng_open,       /* open */
   .read  = esp32c3_rng_read,       /* read */
 };
 
@@ -124,24 +122,6 @@ uint32_t IRAM_ATTR esp_random(void)
   return result ^ getreg32(WDEV_RND_REG);
 }
 
-/****************************************************************************
- * Name: esp32c3_rng_start
- ****************************************************************************/
-
-static void esp32c3_rng_start(void)
-{
-  /* Nothing to do, bootloader already did it */
-}
-
-/****************************************************************************
- * Name: esp32c3_rng_stop
- ****************************************************************************/
-
-static void esp32c3_rng_stop(void)
-{
-  /* Nothing to do */
-}
-
 /****************************************************************************
  * Name: esp32c3_rng_initialize
  ****************************************************************************/
@@ -155,25 +135,6 @@ static int esp32c3_rng_initialize(void)
   nxsem_init(&g_rngdev.rd_sem, 0, 1);
   nxsem_set_protocol(&g_rngdev.rd_sem, SEM_PRIO_NONE);
 
-  esp32c3_rng_stop();
-
-  return OK;
-}
-
-/****************************************************************************
- * Name: esp32c3_rng_open
- ****************************************************************************/
-
-static int esp32c3_rng_open(struct file *filep)
-{
-  /* O_NONBLOCK is not supported */
-
-  if (filep->f_oflags & O_NONBLOCK)
-    {
-      _err("ESP32-C3 RNG doesn't support O_NONBLOCK mode.\n");
-      return -EPERM;
-    }
-
   return OK;
 }
 
@@ -195,11 +156,7 @@ static ssize_t esp32c3_rng_read(struct file *filep, char *buffer,
 
   read_len = buflen;
 
-  /* start RNG and wait until the buffer is filled */
-
-  esp32c3_rng_start();
-
-  /* Now, got data */
+  /* Wait until the buffer is filled */
 
   while (buflen > 0)
     {