linux-kernel - Re: [PATCH] [v2] rtc: bd70528: fix BD71815 watchdog dependency

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Message-ID: <20210422160819.GA104045@roeck-us.net>
Date:   Thu, 22 Apr 2021 09:08:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lee Jones <lee.jones@...aro.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Claudius Heine <ch@...x.de>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] rtc: bd70528: fix BD71815 watchdog dependency

On Thu, Apr 22, 2021 at 05:15:21PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The added Kconfig dependency is slightly incorrect, which can
> lead to a link failure when the watchdog is a loadable module:
> 
> arm-linux-gnueabi-ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_set_rtc_based_timers':
> rtc-bd70528.c:(.text+0x6cc): undefined reference to `bd70528_wdt_set'
> arm-linux-gnueabi-ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_set_time':
> rtc-bd70528.c:(.text+0xaa0): undefined reference to `bd70528_wdt_lock'
> arm-linux-gnueabi-ld: rtc-bd70528.c:(.text+0xab8): undefined reference to `bd70528_wdt_unlock'
> arm-linux-gnueabi-ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_alm_enable':
> rtc-bd70528.c:(.text+0xfc0): undefined reference to `bd70528_wdt_lock'
> arm-linux-gnueabi-ld: rtc-bd70528.c:(.text+0x1030): undefined reference to `bd70528_wdt_unlock'
> 
> The problem is that it allows to be built-in if MFD_ROHM_BD71828
> is built-in, even when the watchdog is a loadable module.
> 
> Rework this so that having the watchdog as a loadable module always
> forces the rtc to be a module as well instead of built-in,
> regardless of bd71828.
> 
> Fixes: c56dc069f268 ("rtc: bd70528: Support RTC on ROHM BD71815")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

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

> ---
> v2: Fix as suggested by Guenter Roeck, reword description
> ---
>  drivers/rtc/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index d8c13fded164..914497abeef9 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -502,7 +502,8 @@ config RTC_DRV_M41T80_WDT
>  
>  config RTC_DRV_BD70528
>  	tristate "ROHM BD70528, BD71815 and BD71828 PMIC RTC"
> -	depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
> +	depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528
> +	depends on BD70528_WATCHDOG || !BD70528_WATCHDOG
>  	help
>  	  If you say Y here you will get support for the RTC
>  	  block on ROHM BD70528, BD71815 and BD71828 Power Management IC.
> -- 
> 2.29.2
>