initial buildroot for linux 5.15

fs/squashfs/Config.in

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+config BR2_TARGET_ROOTFS_SQUASHFS
+	bool "squashfs root filesystem"
+	help
+	  Build a squashfs root filesystem
+
+if BR2_TARGET_ROOTFS_SQUASHFS
+
+config BR2_TARGET_ROOTFS_SQUASHFS_PAD
+	bool "pad to a 4K boundary"
+	default y # legacy was always ON
+	help
+	  Say 'y' here (the default) to pad the the filesystem image
+	  to a 4K boundary. Say 'n' to disable padding.
+
+choice
+	prompt "Compression algorithm"
+	default BR2_TARGET_ROOTFS_SQUASHFS4_GZIP
+	help
+	  Select the squashfs compression algorithm to use when
+	  generating the filesystem.
+
+config BR2_TARGET_ROOTFS_SQUASHFS4_GZIP
+	bool "gzip"
+
+config BR2_TARGET_ROOTFS_SQUASHFS4_LZ4
+	bool "lz4"
+
+config BR2_TARGET_ROOTFS_SQUASHFS4_LZMA
+	bool "lzma"
+
+config BR2_TARGET_ROOTFS_SQUASHFS4_LZO
+	bool "lzo"
+
+config BR2_TARGET_ROOTFS_SQUASHFS4_XZ
+	bool "xz"
+
+config BR2_TARGET_ROOTFS_SQUASHFS4_ZSTD
+	bool "zstd"
+
+endchoice
+
+endif

fs/squashfs/squashfs.mk

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+################################################################################
+#
+# Build the squashfs root filesystem image
+#
+################################################################################
+
+ROOTFS_SQUASHFS_DEPENDENCIES = host-squashfs
+
+ROOTFS_SQUASHFS_ARGS = -noappend -processors $(PARALLEL_JOBS)
+
+ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS_PAD),)
+ROOTFS_SQUASHFS_ARGS += -nopad
+endif
+
+ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_LZ4),y)
+ROOTFS_SQUASHFS_ARGS += -comp lz4 -Xhc
+else ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_LZO),y)
+ROOTFS_SQUASHFS_ARGS += -comp lzo
+else ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_LZMA),y)
+ROOTFS_SQUASHFS_ARGS += -comp lzma
+else ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_XZ),y)
+ROOTFS_SQUASHFS_ARGS += -comp xz
+else ifeq ($(BR2_TARGET_ROOTFS_SQUASHFS4_ZSTD),y)
+ROOTFS_SQUASHFS_ARGS += -comp zstd
+else
+ROOTFS_SQUASHFS_ARGS += -comp gzip
+endif
+
+define ROOTFS_SQUASHFS_CMD
+	$(HOST_DIR)/bin/mksquashfs $(TARGET_DIR) $@ $(ROOTFS_SQUASHFS_ARGS)
+endef
+
+$(eval $(rootfs))