We already have a dependency on BCMA_NFLASH, which in turn depends on
BCMA, but since BCMA is a tristate option and BCMA_NFLASH is bool,
we can run into an invalid configuration with MTD_NAND_BCM47XXNFLASH=y
and BCMA=m:

drivers/mtd/nand/raw/bcm47xxnflash/ops_bcm4706.o: In function 
`bcm47xxnflash_ops_bcm4706_init':
ops_bcm4706.c:(.text+0x790): undefined reference to `bcma_chipco_pll_read'

Adding the dependency here forces MTD_NAND_BCM47XXNFLASH to only be
configured =m here so it can link against the BCMA driver.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/mtd/nand/raw/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 230311fa2cc0..b457f92d55d4 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -364,6 +364,7 @@ config MTD_NAND_BRCMNAND
 config MTD_NAND_BCM47XXNFLASH
        tristate "Support for NAND flash on BCM4706 BCMA bus"
        depends on BCMA_NFLASH
+       depends on BCMA
        help
          BCMA bus can have various flash memories attached, they are
          registered by bcma as platform devices. This enables driver for
-- 
2.9.0

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