boards/mulle: Add FRAM to DevFS

boards/mulle/Makefile.dep

@@ -6,12 +6,10 @@ ifneq (,$(filter saul_default,$(USEMODULE)))
   USEMODULE += lis3dh
 endif
 
-# The RTT clock drives the core clock in the default configuration
-FEATURES_REQUIRED += periph_rtt
-
 # The Mulle uses NVRAM to store persistent variables, such as boot count.
 USEMODULE += nvram_spi
-FEATURES_REQUIRED += periph_spi
+USEMODULE += nvram
+USEMODULE += devfs
 
 ifneq (,$(filter saul_default,$(USEMODULE)))
   USEMODULE += saul_gpio

boards/mulle/board.c

@@ -24,11 +24,13 @@
 #include "cpu.h"
 #include "mcg.h"
 #include "periph/gpio.h"
-#include "periph/uart.h"
 #include "periph/rtt.h"
 #include "periph/spi.h"
 #include "nvram-spi.h"
+#include "nvram.h"
 #include "xtimer.h"
+#include "vfs.h"
+#include "fs/devfs.h"
 
 static nvram_t mulle_nvram_dev;
 nvram_t *mulle_nvram = &mulle_nvram_dev;
@@ -39,6 +41,12 @@ static nvram_spi_params_t nvram_spi_params = {
         .address_count = MULLE_NVRAM_SPI_ADDRESS_COUNT,
 };
 
+static devfs_t mulle_nvram_devfs = {
+    .path = "/mulle-fram",
+    .f_op = &nvram_vfs_ops,
+    .private_data = &mulle_nvram_dev,
+};
+
 /** @brief Initialize the GPIO pins controlling the power switches. */
 static inline void power_pins_init(void);
 
@@ -210,6 +218,10 @@ static int mulle_nvram_init(void)
             return -5;
         }
     }
+
+    /* Register DevFS node */
+    devfs_register(&mulle_nvram_devfs);
+
     return 0;
 }