doc: reference: Add disk access API

Add the disk access API to the doc reference.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>

doc/reference/storage/disk/access.rst

@@ -0,0 +1,23 @@
+.. _disk_access_api:
+
+Disk Access
+###########
+
+Overview
+********
+
+The disk access API provides access to storage disks, physical or in Flash or
+RAM.
+
+Configuration Options
+*********************
+
+Related configuration options:
+
+* :option:`CONFIG_DISK_ACCESS`
+
+API Reference
+*************
+
+.. doxygengroup:: disk_access_interface
+   :project: Zephyr

doc/reference/storage/index.rst

@@ -7,6 +7,7 @@ Storage
    :maxdepth: 1
 
    nvs/nvs.rst
+   disk/access.rst
    disk/sdhc.rst
    flash_map/flash_map.rst
    fcb/fcb.rst

include/disk/disk_access.h

@@ -17,6 +17,12 @@
 #ifndef ZEPHYR_INCLUDE_DISK_DISK_ACCESS_H_
 #define ZEPHYR_INCLUDE_DISK_DISK_ACCESS_H_
 
+/**
+ * @brief Disk Access APIs
+ * @defgroup disk_access_interface Disk Access Interface
+ * @{
+ */
+
 #include <kernel.h>
 #include <zephyr/types.h>
 #include <sys/dlist.h>
@@ -131,4 +137,8 @@ int disk_access_unregister(struct disk_info *disk);
 }
 #endif
 
+/**
+ * @}
+ */
+
 #endif /* ZEPHYR_INCLUDE_DISK_DISK_ACCESS_H_ */