linux-kernel - [PATCH v2 3/3] rtc: pcf2127: only use watchdog when explicitly available

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Date:   Fri, 11 Dec 2020 22:56:11 +0100
From:   Rasmus Villemoes <rasmus.villemoes@...vas.dk>
To:     linux-rtc@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Qiang Zhao <qiang.zhao@....com>,
        Bruno Thomsen <bruno.thomsen@...il.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: [PATCH v2 3/3] rtc: pcf2127: only use watchdog when explicitly available

From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Most boards using the pcf2127 chip (in my bubble) don't make use of the
watchdog functionality and the respective output is not connected. The
effect on such a board is that there is a watchdog device provided that
doesn't work.

So only register the watchdog if the device tree has a "reset-source"
property.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
[RV: s/has-watchdog/reset-source/]
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
---
 drivers/rtc/rtc-pcf2127.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index aebf85fcc328..f3d4eac4f230 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -340,7 +340,8 @@ static int pcf2127_watchdog_init(struct device *dev, struct pcf2127 *pcf2127)
 	u32 wdd_timeout;
 	int ret;
 
-	if (!IS_ENABLED(CONFIG_WATCHDOG))
+	if (!IS_ENABLED(CONFIG_WATCHDOG) ||
+	    !device_property_read_bool(dev, "reset-source"))
 		return 0;
 
 	pcf2127->wdd.parent = dev;
-- 
2.23.0