initial buildroot for linux 5.15

fs/ubifs/Config.in

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+config BR2_TARGET_ROOTFS_UBIFS
+	bool "ubifs root filesystem"
+	help
+	  Build a ubifs root filesystem
+
+if BR2_TARGET_ROOTFS_UBIFS
+
+config BR2_TARGET_ROOTFS_UBIFS_LEBSIZE
+	hex "logical eraseblock size"
+	default 0x1f800
+	help
+	  Logical eraseblock (LEB) size. The value provided here is
+	  passed to the -e/--leb-size option of mkfs.ubifs.
+
+config BR2_TARGET_ROOTFS_UBIFS_MINIOSIZE
+	hex "minimum I/O unit size"
+	default 0x800
+	help
+	  Minimum I/O unit size. The value provided here is passed
+	  to the -m/--min-io-size option of mkfs.ubifs/ubinize.
+
+config BR2_TARGET_ROOTFS_UBIFS_MAXLEBCNT
+	int "maximum logical eraseblock count"
+	default 2048
+	help
+	  Maximum logical eraseblock (LEB) count. The value provided
+	  here is passed to the -c/--max-leb-cnt option of mkfs.ubifs.
+
+choice
+	prompt "ubifs runtime compression"
+	default BR2_TARGET_ROOTFS_UBIFS_RT_LZO
+	help
+	  Select which compression format to use at run-time within
+	  the ubifs file system. The choice made here is passed to
+	  the -x/--compr option of mkfs.ubifs
+
+config BR2_TARGET_ROOTFS_UBIFS_RT_NONE
+	bool "no compression"
+	help
+	  Don't use run-time compression.
+
+config BR2_TARGET_ROOTFS_UBIFS_RT_ZLIB
+	bool "gzip"
+	help
+	  Use zlib compression at run-time.
+
+config BR2_TARGET_ROOTFS_UBIFS_RT_LZO
+	bool "lzo"
+	help
+	  Use lzo compression at run-time.
+
+endchoice
+
+choice
+	prompt "Compression method"
+	default BR2_TARGET_ROOTFS_UBIFS_NONE
+	help
+	  Select which compression format to compress the final image
+	  into.
+
+config BR2_TARGET_ROOTFS_UBIFS_NONE
+	bool "no compression"
+	help
+	  Do not compress the ubifs filesystem.
+
+config BR2_TARGET_ROOTFS_UBIFS_GZIP
+	bool "gzip"
+	help
+	  Do compress the ubifs filesystem with gzip.
+
+config BR2_TARGET_ROOTFS_UBIFS_BZIP2
+	bool "bzip2"
+	help
+	  Do compress the ubifs filesystem with bzip2.
+
+config BR2_TARGET_ROOTFS_UBIFS_LZMA
+	bool "lzma"
+	help
+	  Do compress the ubifs filesystem with lzma.
+
+config BR2_TARGET_ROOTFS_UBIFS_LZO
+	bool "lzo"
+	help
+	  Do compress the ubifs filesystem with lzop.
+
+config BR2_TARGET_ROOTFS_UBIFS_XZ
+	bool "xz"
+	help
+	  Do compress the ubifs filesystem with xz.
+
+endchoice
+
+config BR2_TARGET_ROOTFS_UBIFS_OPTS
+	string "Additional mkfs.ubifs options"
+	help
+	  Any additional mkfs.ubifs options you may want to include.
+
+endif # BR2_TARGET_ROOTFS_UBIFS

fs/ubifs/ubifs.mk

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+################################################################################
+#
+# Build the ubifs root filesystem image
+#
+################################################################################
+
+UBIFS_OPTS = \
+	-e $(BR2_TARGET_ROOTFS_UBIFS_LEBSIZE) \
+	-c $(BR2_TARGET_ROOTFS_UBIFS_MAXLEBCNT) \
+	-m $(BR2_TARGET_ROOTFS_UBIFS_MINIOSIZE)
+
+ifeq ($(BR2_TARGET_ROOTFS_UBIFS_RT_ZLIB),y)
+UBIFS_OPTS += -x zlib
+endif
+ifeq ($(BR2_TARGET_ROOTFS_UBIFS_RT_LZO),y)
+UBIFS_OPTS += -x lzo
+endif
+ifeq ($(BR2_TARGET_ROOTFS_UBIFS_RT_NONE),y)
+UBIFS_OPTS += -x none
+endif
+
+UBIFS_OPTS += $(call qstrip,$(BR2_TARGET_ROOTFS_UBIFS_OPTS))
+
+ROOTFS_UBIFS_DEPENDENCIES = host-mtd
+
+define ROOTFS_UBIFS_CMD
+	$(HOST_DIR)/sbin/mkfs.ubifs -d $(TARGET_DIR) $(UBIFS_OPTS) -o $@
+endef
+
+$(eval $(rootfs))