Commit a7ceca43 authored by Primoz Fiser's avatar Primoz Fiser Committed by Wim Van Sebroeck
Browse files

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 f6c98b08 ("watchdog: da9062: add
power management ops") and commit 8541673d ("watchdog: da9062: fix
power management ops") and brings the same functionality to DA9063.

Signed-off-by: default avatarPrimoz Fiser <primoz.fiser@norik.com>
Reviewed-by: default avatarAdam Thomson <DLG-Adam.Thomson.Opensource@dm.renesas.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220422072713.3172345-2-primoz.fiser@norik.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent b1912875

drivers/watchdog/da9063_wdt.c

+36 −0
Original line number Diff line number Diff line
@@ -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);