linux-kernel - Re: [PATCH] mtd: nand/raw: MTD_NAND_BCM47XXNFLASH needs CONFIG

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Date:   Wed, 11 Jul 2018 10:44:46 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: nand/raw: MTD_NAND_BCM47XXNFLASH needs CONFIG_BCMA

On Wed, 11 Jul 2018 10:39:44 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> 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 <arnd@...db.de>

Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>

> ---
>  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