drivers/mtd: descend into sub directories only when it is necessary

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

Makefile

@@ -249,9 +249,9 @@ LIBS-y += drivers/i2c/
 LIBS-y += drivers/input/
 LIBS-y += drivers/mmc/
 LIBS-y += drivers/mtd/
-LIBS-y += drivers/mtd/nand/
+LIBS-$(CONFIG_CMD_NAND) += drivers/mtd/nand/
 LIBS-y += drivers/mtd/onenand/
-LIBS-y += drivers/mtd/ubi/
+LIBS-$(CONFIG_CMD_UBI) += drivers/mtd/ubi/
 LIBS-y += drivers/mtd/spi/
 LIBS-y += drivers/net/
 LIBS-y += drivers/net/phy/

drivers/mtd/nand/Makefile

@@ -5,8 +5,6 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-ifdef CONFIG_CMD_NAND
-
 ifdef CONFIG_SPL_BUILD
 
 ifdef CONFIG_SPL_NAND_DRIVERS
@@ -69,4 +67,3 @@ obj-$(CONFIG_NAND_FSL_IFC) += fsl_ifc_spl.o
 obj-$(CONFIG_NAND_MXC) += mxc_nand_spl.o
 
 endif # drivers
-endif # nand

drivers/mtd/ubi/Makefile

@@ -5,9 +5,6 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-ifdef CONFIG_CMD_UBI
 obj-y += build.o vtbl.o vmt.o upd.o kapi.o eba.o io.o wl.o scan.o crc32.o
-
 obj-y += misc.o
 obj-y += debug.o
-endif

spl/Makefile

@@ -78,7 +78,7 @@ LIBS-y += fs/
 LIBS-$(CONFIG_SPL_LIBGENERIC_SUPPORT) += lib/
 LIBS-$(CONFIG_SPL_POWER_SUPPORT) += drivers/power/ \
 	drivers/power/pmic/
-LIBS-$(CONFIG_SPL_NAND_SUPPORT) += drivers/mtd/nand/
+LIBS-$(if $(CONFIG_CMD_NAND),$(CONFIG_SPL_NAND_SUPPORT)) += drivers/mtd/nand/
 LIBS-$(CONFIG_SPL_ONENAND_SUPPORT) += drivers/mtd/onenand/
 LIBS-$(CONFIG_SPL_DMA_SUPPORT) += drivers/dma/
 LIBS-$(CONFIG_SPL_POST_MEM_SUPPORT) += post/drivers/