From a74cab40b5dc51b5ed042add1c5d2f5e9a1964bc Mon Sep 17 00:00:00 2001
From: Stefan Christ <s.christ@phytec.de>
Date: Wed, 6 Jul 2016 10:40:11 +0200
Subject: [PATCH] watchdog: da9063_wdt: don't trigger watchdog too fast
Triggering the watchdog faster than T_WDMIN=256ms leads to resets of the
DA9063 chip. The datasheet says that the watchdog must only be triggered
in the timeframe T_WDMIN to T_WDMAX. The T_WDMAX is configured in the
driver.
Signed-off-by: Stefan Christ <s.christ@phytec.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
---
drivers/watchdog/da9063_wdt.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index a100f648880d85..5d6b4e5f7989cc 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -34,6 +34,7 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
#define DA9063_WDG_TIMEOUT wdt_timeout[3]
+#define DA9063_RESET_PROTECTION_MS 256
struct da9063_watchdog {
struct da9063 *da9063;
@@ -171,6 +172,7 @@ static int da9063_wdt_probe(struct platform_device *pdev)
wdt->wdtdev.ops = &da9063_watchdog_ops;
wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT;
wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT;
+ wdt->wdtdev.min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS;
wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT;
wdt->wdtdev.parent = &pdev->dev;
--
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