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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 f6c98b0838 ("watchdog: da9062: add
power management ops") and commit 8541673d2a ("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>
This commit is contained in:
Primoz Fiser 2022-04-22 09:27:12 +02:00 committed by Wim Van Sebroeck
parent b1912875a5
commit a7ceca4398
1 changed files with 36 additions and 0 deletions
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36
drivers/watchdog/da9063_wdt.c
View File

@ -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);