watchdog: da9063: optionally disable watchdog during suspend

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@norik.com>
Reviewed-by: Adam Thomson <DLG-Adam.Thomson.Opensource@dm.renesas.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220422072713.3172345-2-primoz.fiser@norik.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 9adad1862bbdb78378017f7afe488a087260fb10..09a4af4c58fc85f6d9cc858325a1b43bf18819fc 100644 (file)
--- 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);