drivers/mtd_sdcard: add mtd_sdcard_default module

drivers/mtd/Kconfig

@@ -23,6 +23,15 @@ config HAVE_MTD_NATIVE
     help
         Indicates that a native MTD is present.
 
+config HAVE_MTD_SDCARD_DEFAULT
+    bool
+    imply MODULE_MTD_SDCARD if MODULE_MTD
+    imply MODULE_MTD_SDCARD_DEFAULT if MODULE_MTD
+    imply MODULE_SDCARD_SPI if MODULE_MTD
+    select HAS_SDCARD_SPI
+    help
+        Indicates that a sdcard MTD is present with generic configuration
+
 config HAVE_MTD_SDCARD
     bool
     imply MODULE_MTD_SDCARD if MODULE_MTD
@@ -86,6 +95,12 @@ config MODULE_MTD_MCI
     depends on CPU_FAM_LPC23XX
     select MODULE_MCI
 
+config MODULE_MTD_SDCARD_DEFAULT
+    bool "Use Generic SD card configuration"
+    depends on MODULE_MTD_SDCARD
+    help
+        Automatically create a MTD device and mount point for the SD card.
+
 config MODULE_MTD_SDCARD
     bool "MTD interface for SPI SD-Card"
     depends on MODULE_SDCARD_SPI

drivers/mtd/Makefile.dep

@@ -6,6 +6,10 @@ ifneq (,$(filter mtd_at25xxx,$(USEMODULE)))
   USEMODULE += at25xxx
 endif
 
+ifneq (,$(filter mtd_sdcard_default,$(USEMODULE)))
+  USEMODULE += mtd_sdcard
+endif
+
 ifneq (,$(filter mtd_sdcard,$(USEMODULE)))
   USEMODULE += sdcard_spi
 endif

drivers/mtd_sdcard/Kconfig

@@ -13,6 +13,14 @@ menuconfig KCONFIG_USEMODULE_MTD_SDCARD
 
 if KCONFIG_USEMODULE_MTD_SDCARD
 
+config SDCARD_GENERIC_MTD_OFFSET
+    depends on MODULE_MTD_SDCARD_DEFAULT
+    int "Index of first auto-configured MTD SDcard device"
+    default 0
+    help
+        If you have other MTD devices defined, set this number so that
+        the auto-configured SD Card(s) from mtd_sdcard_default will come after them.
+
 config MTD_SDCARD_ERASE
     bool "Enable SD card erase"
     help

drivers/mtd_sdcard/Makefile.include

@@ -0,0 +1 @@
+PSEUDOMODULES += mtd_sdcard_default

drivers/mtd_sdcard/mtd_sdcard.c

@@ -221,3 +221,37 @@ const mtd_desc_t mtd_sdcard_driver = {
     .erase_sector = mtd_sdcard_erase_sector,
     .power = mtd_sdcard_power,
 };
+
+#if IS_USED(MODULE_MTD_SDCARD_DEFAULT)
+#include "sdcard_spi_params.h"
+#include "vfs_default.h"
+
+#define SDCARD_NUMOF ARRAY_SIZE(sdcard_spi_params)
+
+#ifndef CONFIG_SDCARD_GENERIC_MTD_OFFSET
+#define CONFIG_SDCARD_GENERIC_MTD_OFFSET 0
+#endif
+
+#define MTD_SDCARD_DEV(n, m)                \
+    mtd_sdcard_t mtd_sdcard_dev ## n = {    \
+        .base = {                           \
+           .driver = &mtd_sdcard_driver,    \
+        },                                  \
+        .sd_card = &sdcard_spi_devs[n],     \
+        .params = &sdcard_spi_params[n]     \
+    };                                      \
+                                            \
+    mtd_dev_t CONCAT(*mtd, m) = (mtd_dev_t *)&mtd_sdcard_dev ## n
+
+#define MTD_SDCARD_DEV_FS(n, m, filesystem) \
+    VFS_AUTO_MOUNT(filesystem, VFS_MTD(mtd_sdcard_dev ## n), VFS_DEFAULT_SD(n), m)
+
+/* this is provided by the sdcard_spi driver see drivers/sdcard_spi/sdcard_spi.c */
+extern sdcard_spi_t sdcard_spi_devs[SDCARD_NUMOF];
+
+MTD_SDCARD_DEV(0, CONFIG_SDCARD_GENERIC_MTD_OFFSET);
+#ifdef MODULE_FATFS_VFS
+MTD_SDCARD_DEV_FS(0, CONFIG_SDCARD_GENERIC_MTD_OFFSET, fatfs);
+#endif
+
+#endif