boards/arm/nrf52/nrf52840-dk: add procfs support

boards/arm/nrf52/nrf52840-dk/src/nrf52840-dk.h

@@ -34,6 +34,18 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
+/* Configuration ************************************************************/
+
+/* procfs File System */
+
+#ifdef CONFIG_FS_PROCFS
+#  ifdef CONFIG_NSH_PROC_MOUNTPOINT
+#    define NRF52_PROCFS_MOUNTPOINT CONFIG_NSH_PROC_MOUNTPOINT
+#  else
+#    define NRF52_PROCFS_MOUNTPOINT "/proc"
+#  endif
+#endif
+
 /* LED definitions **********************************************************/
 
 /* Definitions to configure LED GPIO as outputs */

boards/arm/nrf52/nrf52840-dk/src/nrf52_bringup.c

@@ -27,6 +27,8 @@
 #include <sys/types.h>
 #include <syslog.h>
 
+#include <nuttx/fs/fs.h>
+
 #ifdef CONFIG_USERLED
 #  include <nuttx/leds/userled.h>
 #endif
@@ -113,6 +115,17 @@ int nrf52_bringup(void)
 {
   int ret;
 
+#ifdef CONFIG_FS_PROCFS
+  /* Mount the procfs file system */
+
+  ret = nx_mount(NULL, NRF52_PROCFS_MOUNTPOINT, "procfs", 0, NULL);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR,
+             "ERROR: Failed to mount the PROC filesystem: %d\n",  ret);
+    }
+#endif /* CONFIG_FS_PROCFS */
+
 #ifdef CONFIG_USERLED
   /* Register the LED driver */