tests: Support testing fatfs on mmc

Make another project configuration in the fat_fs_api
test to allow using mmc for the test

Signed-off-by: Declan Snyder <[email protected]>

Author: decsny

tests/subsys/fs/fat_fs_api/README.txt

@@ -13,6 +13,8 @@ The demo will run on native_posix and will use the on-board SPI flash.
        cmake -DBOARD=native_posix ..
        make run
 
+To test fatfs on MMC, add this cmake option to your build command:
+	-DCONF_FILE=prj_mmc.conf
 --------------------------------------------------------------------------------
 
 Sample Output:

tests/subsys/fs/fat_fs_api/prj_mmc.conf

@@ -0,0 +1,9 @@
+CONFIG_FILE_SYSTEM=y
+CONFIG_LOG=y
+CONFIG_FAT_FILESYSTEM_ELM=y
+CONFIG_SPI=y
+CONFIG_GPIO=y
+CONFIG_ZTEST=y
+CONFIG_ZTEST_NEW_API=y
+CONFIG_MMC_VOLUME_NAME="NAND"
+CONFIG_MAIN_STACK_SIZE=4096

tests/subsys/fs/fat_fs_api/testcase.yaml

@@ -8,3 +8,6 @@ tests:
   filesystem.fat.api.lfn:
     extra_args: CONF_FILE="prj_lfn.conf"
     platform_allow: native_posix
+  filesystem.fat.api.mmc:
+    extra_args: CONF_FILE="prj_mmc.conf"
+    filter: dt_compat_enabled("zephyr,mmc-disk")