linux-kernel - Re: [PATCH 5/8] watchdog: menf21bmc: add I2C dependency

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Date:   Tue, 28 Feb 2017 13:43:01 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Wim Van Sebroeck <wim@...ana.be>, linux-watchdog@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] watchdog: menf21bmc: add I2C dependency

On Tue, Feb 28, 2017 at 10:01:20PM +0100, Arnd Bergmann wrote:
> This driver fails to link when CONFIG_I2C is disabled or a loadable module while
> the watchdog is built-in:
> 
> drivers/watchdog/built-in.o: In function `menf21bmc_wdt_shutdown':
> menf21bmc_wdt.c:(.text+0x9b44): undefined reference to `i2c_smbus_write_word_data'
> menf21bmc_wdt.c:(.text+0x9b44): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `i2c_smbus_write_word_data'
> 
> This adds a Kconfig dependency for it, to enforce a valid configuration.
> 
> Fixes: da2a68b3eb47 ("watchdog: Enable COMPILE_TEST where possible")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index de52495ef150..ab0ec389e436 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -142,6 +142,7 @@ config GPIO_WATCHDOG_ARCH_INITCALL
>  config MENF21BMC_WATCHDOG
>  	tristate "MEN 14F021P00 BMC Watchdog"
>  	depends on MFD_MENF21BMC || COMPILE_TEST
> +	depends on I2C
>  	select WATCHDOG_CORE
>  	help
>  	  Say Y here to include support for the MEN 14F021P00 BMC Watchdog.
> -- 
> 2.9.0
>