This commit adds a hidden option to build the omap_elm as a module, if
omap2_nand is a module (and similarly in the built-in case).

This fixes the following build error when omap2_nand is chosen built-in,
and omap_elm is chosen as a module:

drivers/built-in.o: In function `omap_nand_probe':
/work/linux-2.6/drivers/mtd/nand/omap2.c:2010: undefined reference to 
`elm_config'
/work/linux-2.6/drivers/mtd/nand/omap2.c:1980: undefined reference to 
`elm_config'
/work/linux-2.6/drivers/mtd/nand/omap2.c:1927: undefined reference to 
`elm_config'
drivers/built-in.o: In function `omap_elm_correct_data':
/work/linux-2.6/drivers/mtd/nand/omap2.c:1444: undefined reference to 
`elm_decode_bch_error_page'

Signed-off-by: Ezequiel Garcia <[email protected]>
---
 drivers/mtd/nand/Kconfig  | 8 +++++++-
 drivers/mtd/nand/Makefile | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index f1cf503..12e8ee8 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -96,7 +96,7 @@ config MTD_NAND_OMAP2
 
 config MTD_NAND_OMAP_BCH
        depends on MTD_NAND_OMAP2
-       tristate "Support hardware based BCH error correction"
+       bool "Support hardware based BCH error correction"
        default n
        select BCH
        help
@@ -106,6 +106,12 @@ config MTD_NAND_OMAP_BCH
          legacy OMAP families like OMAP2xxx, OMAP3xxx do not have ELM engine
          so they should not enable this config symbol.
 
+config MTD_NAND_OMAP_BCH_BUILD
+       tristate
+       depends on MTD_NAND_OMAP2
+       default m if MTD_NAND_OMAP2=m && MTD_NAND_OMAP_BCH
+       default y if MTD_NAND_OMAP2=y && MTD_NAND_OMAP_BCH
+
 config MTD_NAND_IDS
        tristate
 
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 4bcdeb0..3580188 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -27,7 +27,7 @@ obj-$(CONFIG_MTD_NAND_NDFC)           += ndfc.o
 obj-$(CONFIG_MTD_NAND_ATMEL)           += atmel_nand.o
 obj-$(CONFIG_MTD_NAND_GPIO)            += gpio.o
 obj-$(CONFIG_MTD_NAND_OMAP2)           += omap2_nand.o
-obj-$(CONFIG_MTD_NAND_OMAP_BCH)                += omap_elm.o
+obj-$(CONFIG_MTD_NAND_OMAP_BCH_BUILD)  += omap_elm.o
 obj-$(CONFIG_MTD_NAND_CM_X270)         += cmx270_nand.o
 obj-$(CONFIG_MTD_NAND_PXA3xx)          += pxa3xx_nand.o
 obj-$(CONFIG_MTD_NAND_TMIO)            += tmio_nand.o
-- 
2.1.0

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