On Fri, Oct 16, 2015 at 06:24:21PM +0200, Arnd Bergmann wrote:

I think you also need this one:

Are you sure?

8<-----------
From 0ab7b2d32921b3f3da15274d8c3982ba1d54660f Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Thu, 4 Jun 2015 09:25:59 +0200
Subject: [PATCH] mtd: brcmnand depends on MTD_NAND

MTD_NAND_BRCMNAND uses the generic nand functions, but is currently allowed
to be built without CONFIG_MTD_NAND, which results in a link error:

drivers/built-in.o: In function `brcmnand_remove':
coresight-replicator.c:(.text+0x17ae6c): undefined reference to `nand_release'
drivers/built-in.o: In function `brcmnand_probe':
coresight-replicator.c:(.text+0x17d4b4): undefined reference to `nand_scan_ident'
coresight-replicator.c:(.text+0x17d948): undefined reference to `nand_scan_tail'

How did you get this? MTD_NAND_BRCMNAND is surrounded in the
'if MTD_NAND' block, which implicitly generates a MTD_NAND dependency.
And I can confirm that in menuconfig, I see this when I disable MTD_NAND
and search for BRCMNAND:

   Symbol: MTD_NAND_BRCMNAND [=n]
   Type  : tristate
   Prompt: Broadcom STB NAND controller
     Location:
       -> Device Drivers
         -> Memory Technology Device (MTD) support (MTD [=y])
   (1)     -> NAND Device Support (MTD_NAND [=n])
     Defined at drivers/mtd/nand/Kconfig:394
     Depends on: MTD [=y] && MTD_NAND [=n] && (ARM [=y] || ARM64 || MIPS)

Brian