linux-kernel - Re: [PATCH] rtc: bd70528: add dependency to fix build errors

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Date:   Mon, 8 Jul 2019 13:29:14 +0000
From:   "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
To:     "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>
Subject: Re: [PATCH] rtc: bd70528: add dependency to fix build errors

Hello Randy,

Thanks a lot for trying to clean up the mess :)

On Sun, 2019-07-07 at 09:12 -0700, Randy Dunlap wrote:
> From: Randy Dunlap <rdunlap@...radead.org>
> 
> Fix build errors when MFD_ROHM_BD70528=m, BD70528_WATCHDOG=m,
> and RTC_DRV_BD70528=y.  Fixes these build errors:
> 
> ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_alm_enable':
> rtc-bd70528.c:(.text+0x3a2): undefined reference to
> `bd70528_wdt_lock'
> ld: rtc-bd70528.c:(.text+0x3f8): undefined reference to
> `bd70528_wdt_unlock'
> ld: drivers/rtc/rtc-bd70528.o: in function
> `bd70528_set_rtc_based_timers':
> rtc-bd70528.c:(.text+0x41c): undefined reference to `bd70528_wdt_set'
> ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_set_time':
> rtc-bd70528.c:(.text+0x500): undefined reference to
> `bd70528_wdt_lock'
> ld: rtc-bd70528.c:(.text+0x587): undefined reference to
> `bd70528_wdt_unlock'
> 
> Also add a blank line to separate the Kconfig entry from the one
> above it.
> 
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> Cc: linux-rtc@...r.kernel.org
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
> Found in mmotm but applies to linux-next.
> 
>  drivers/rtc/Kconfig |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- mmotm-2019-0706-2200.orig/drivers/rtc/Kconfig
> +++ mmotm-2019-0706-2200/drivers/rtc/Kconfig
> @@ -498,8 +498,10 @@ config RTC_DRV_M41T80_WDT
>  	help
>  	  If you say Y here you will get support for the
>  	  watchdog timer in the ST M41T60 and M41T80 RTC chips series.
> +
>  config RTC_DRV_BD70528
>  	tristate "ROHM BD70528 PMIC RTC"
> +	depends on MFD_ROHM_BD70528

This is definitely required dependency. But I guess this is still not
fixing everything... I assume this allows configuring MFD and RTC in-
kernel while leaving WDG to be built as module. That will probably also
fail. I am not sure how to solve this elegantly while still allowing
WDG to be left out if it is not needed.

>  	help
>  	  If you say Y here you will get support for the RTC
>  	  on ROHM BD70528 Power Management IC.
> 
> 

Br,
	Matti Vaittinen