Optionally disable watchdog during suspend (if enabled) and re-enable
it upon resume.
This enables boards to sleep without being interrupted by the watchdog.
This patch is based on commit f6c98b08381c ("watchdog: da9062: add
power management ops") and commit 8541673d2a5f ("watchdog: da9062: fix
power management ops") and brings the same functionality to DA9063.
Signed-off-by: Primoz Fiser <primoz.fiser@xxxxxxxxx>
---
drivers/watchdog/da9063_wdt.c | 36 +++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 9adad1862bbd..09a4af4c58fc 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -18,6 +18,7 @@
#include <linux/delay.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
+#include <linux/property.h>
#include <linux/regmap.h>
/*
@@ -26,6 +27,8 @@
* others: timeout = 2048 ms * 2^(TWDSCALE-1).
*/
static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
+static bool use_sw_pm;
+
#define DA9063_TWDSCALE_DISABLE 0
#define DA9063_TWDSCALE_MIN 1
#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
@@ -218,6 +221,8 @@ static int da9063_wdt_probe(struct platform_device *pdev)
if (!wdd)
return -ENOMEM;
+ use_sw_pm = device_property_present(dev, "dlg,use-sw-pm");
+
wdd->info = &da9063_watchdog_info;
wdd->ops = &da9063_watchdog_ops;
wdd->min_timeout = DA9063_WDT_MIN_TIMEOUT;
@@ -228,6 +233,7 @@ static int da9063_wdt_probe(struct platform_device *pdev)
watchdog_set_restart_priority(wdd, 128);
watchdog_set_drvdata(wdd, da9063);
+ dev_set_drvdata(dev, wdd);
wdd->timeout = DA9063_WDG_TIMEOUT;
@@ -249,10 +255,40 @@ static int da9063_wdt_probe(struct platform_device *pdev)
return devm_watchdog_register_device(dev, wdd);
}
+static int __maybe_unused da9063_wdt_suspend(struct device *dev)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+ if (!use_sw_pm)
+ return 0;
+
+ if (watchdog_active(wdd))
+ return da9063_wdt_stop(wdd);
+
+ return 0;
+}
+
+static int __maybe_unused da9063_wdt_resume(struct device *dev)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+ if (!use_sw_pm)
+ return 0;
+
+ if (watchdog_active(wdd))
+ return da9063_wdt_start(wdd);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(da9063_wdt_pm_ops,
+ da9063_wdt_suspend, da9063_wdt_resume);
+
static struct platform_driver da9063_wdt_driver = {
.probe = da9063_wdt_probe,
.driver = {
.name = DA9063_DRVNAME_WATCHDOG,
+ .pm = &da9063_wdt_pm_ops,
},
};
module_platform_driver(da9063_wdt_driver);
--
2.25.1
