fs: Provide an SPL Kconfig for legacy-filesystem support

Add a new SPL_FS_LEGACY which mirrors the recently added FS_LEGACY
option.

Select this new option when filesystems are required, either due to
SPL_FS_LOADER or one of the filesystems.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/spl/Kconfig

@@ -725,6 +725,7 @@ config SPL_ETH
 config SPL_FS_EXT4
 	bool "Support EXT filesystems"
 	select SPL_CRC16 if EXT4_WRITE
+	select SPL_FS_LEGACY
 	help
 	  Enable support for EXT2/3/4 filesystems with SPL. This permits
 	  U-Boot (or Linux in Falcon mode) to be loaded from an EXT
@@ -734,6 +735,7 @@ config SPL_FS_EXT4
 config SPL_FS_SQUASHFS
 	bool "Support SquashFS filesystems"
 	select FS_SQUASHFS
+	select SPL_FS_LEGACY
 	help
 	  Enable support for SquashFS filesystems with SPL. This permits
 	  U-Boot (or Linux in Falcon mode) to be loaded from a SquashFS
@@ -743,6 +745,7 @@ config SPL_FS_SQUASHFS
 config SPL_FS_FAT
 	bool "Support FAT filesystems"
 	select FS_FAT
+	select SPL_FS_LEGACY
 	help
 	  Enable support for FAT and VFAT filesystems with SPL. This
 	  permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT

drivers/misc/Kconfig

@@ -627,6 +627,7 @@ config FS_LOADER
 config SPL_FS_LOADER
 	bool "Enable loader driver for file system in SPL"
 	depends on SPL
+	select SPL_FS_LEGACY
 	help
 	  This is file system generic loader which can be used to load
 	  the file image from the storage into target such as memory.

fs/Kconfig

@@ -11,6 +11,14 @@ config FS_LEGACY
 	  which can talk to one filesystem at a time, with the filesystem being
 	  re-mounted on each operation.
 
+config SPL_FS_LEGACY
+	bool
+	depends on SPL
+	help
+	  Enables legacy support for filesystems in SPL. This provides an
+	  interface which can talk to one filesystem at a time, with the
+	  filesystem being re-mounted on each operation.
+
 source "fs/btrfs/Kconfig"
 
 source "fs/cbfs/Kconfig"

fs/Makefile

@@ -4,14 +4,14 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 # Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 
+obj-$(CONFIG_$(PHASE_)FS_LEGACY) += fs_legacy.o fs_internal.o
+
 ifdef CONFIG_XPL_BUILD
-obj-$(CONFIG_SPL_FS_LOADER) += fs_legacy.o
 obj-$(CONFIG_SPL_FS_FAT) += fat/
 obj-$(CONFIG_SPL_FS_EXT4) += ext4/
 obj-$(CONFIG_SPL_FS_CBFS) += cbfs/
 obj-$(CONFIG_SPL_FS_SQUASHFS) += squashfs/
 else
-obj-$(CONFIG_FS_LEGACY) += fs_legacy.o
 
 obj-$(CONFIG_FS_BTRFS) += btrfs/
 obj-$(CONFIG_FS_CBFS) += cbfs/
@@ -28,4 +28,3 @@ obj-$(CONFIG_CMD_ZFS) += zfs/
 obj-$(CONFIG_FS_SQUASHFS) += squashfs/
 obj-$(CONFIG_FS_EROFS) += erofs/
 endif
-obj-$(CONFIG_FS_LEGACY) += fs_internal.o