boards/esp32c3-devkit: Support mounting SPI Flash MTD to littleFS

boards/risc-v/esp32c3/esp32c3-devkit/Kconfig

@@ -65,6 +65,11 @@ choice
 
 endchoice
 
+config ESP32C3_SPIFLASH_FS_MOUNT_PT
+	string "File-system Mount Point"
+	depends on ESP32C3_SPIFLASH_LITTLEFS
+	default "/data"
+
 config ESP32C3_SPIFLASH_ENCRYPTION_TEST
 	bool "SPI Flash encryption test"
 	default n

boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_spiflash.c

@@ -42,6 +42,14 @@
 #include "esp32c3_spiflash.h"
 #include "esp32c3-devkit.h"
 
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define ESP32C3_MTD_PATH      "/dev/esp32c3flash"
+
+#define ESP32C3_FS_MOUNT_PT   CONFIG_ESP32C3_SPIFLASH_FS_MOUNT_PT
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -89,6 +97,27 @@ int esp32c3_spiflash_init(void)
       return ret;
     }
 
+#elif defined (CONFIG_ESP32C3_SPIFLASH_LITTLEFS)
+  ret = register_mtddriver(ESP32C3_MTD_PATH, mtd, 0755, NULL);
+  if (ret < 0)
+    {
+      ferr("ERROR: Register MTD failed: %d\n", ret);
+      return ret;
+    }
+
+  ret = mount(ESP32C3_MTD_PATH, ESP32C3_FS_MOUNT_PT,
+              "littlefs", 0, NULL);
+  if (ret < 0)
+    {
+      ret = mount(ESP32C3_MTD_PATH, ESP32C3_FS_MOUNT_PT,
+                  "littlefs", 0, "forceformat");
+      if (ret < 0)
+        {
+          syslog(LOG_ERR, "ERROR: Failed to mount the FS volume: %d\n",
+                 errno);
+          return ret;
+        }
+    }
 #else
   ret = register_mtddriver("/dev/esp32c3flash", mtd, 0755, NULL);
   if (ret < 0)