linux-kernel - [PATCH] rtc: bd70528: fix driver dependencies

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Message-ID: <84462e01e43d39024948a3bdd24087ff87dc2255.1565591387.git.matti.vaittinen@fi.rohmeurope.com>
Date:   Mon, 12 Aug 2019 09:36:11 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     matti.vaittinen@...rohmeurope.com, mazziesaccount@...il.com
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        Lee Jones <lee.jones@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        "yuehaibing@...wei.com" <yuehaibing@...wei.com>
Subject: [PATCH] rtc: bd70528: fix driver dependencies

With CONFIG_BD70528_WATCHDOG=m, a built-in rtc driver cannot call
into the low-level functions that are part of the watchdog module:

drivers/rtc/rtc-bd70528.o: In function `bd70528_set_time':
rtc-bd70528.c:(.text+0x22c): undefined reference to `bd70528_wdt_lock'
rtc-bd70528.c:(.text+0x2a8): undefined reference to `bd70528_wdt_unlock'
drivers/rtc/rtc-bd70528.o: In function `bd70528_set_rtc_based_timers':
rtc-bd70528.c:(.text+0x50c): undefined reference to `bd70528_wdt_set'

Add a Kconfig dependency which forces RTC to be a module if watchdog is a
module. If watchdog is not compiled at all the stub functions for watchdog
control are used. compiling the RTC without watchdog is fine.

Fixes: 32a4a4ebf768 ("rtc: bd70528: Initial support for ROHM bd70528 RTC")
Suggested-by: Arnd Bergmann <arnd@...db.de>
Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
 Issue was found by kbuildbot from linux-next. Issue was addressed by
 Arnd and Randy - but those solutions disallowed compiling the RTC
 without watchdog. This patch is a result of discussion with Arnd and it
 was created on top of Linus' tree (tag v5.3-rc4).
 drivers/rtc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e72f65b61176..add43c337489 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -500,6 +500,7 @@ config RTC_DRV_M41T80_WDT
 	  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 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
 	help
 	  If you say Y here you will get support for the RTC
 	  on ROHM BD70528 Power Management IC.
-- 
2.17.2


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]