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drivers: watchdog: wdt_mcux_wwdt: Add PM support for low power modes

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Enables sleep mode (PM3) on RW61x. The driver
re-enables the wdt on wake-up based on the previous
configuration. Note that the wdt counter value always
resets to the max window value on wake-up

Signed-off-by: Alex Rodriguez <alejandro.rodriguezlimon@nxp.com>
This commit is contained in:
Alex Rodriguez 2025-05-08 23:14:48 -05:00 committed by Benjamin Cabé
parent dafdcab0fa
commit 64b8d9e0cf
1 changed files with 48 additions and 4 deletions
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52
drivers/watchdog/wdt_mcux_wwdt.c
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@ -3,7 +3,7 @@
*
* Based on wdt_mcux_wdog32.c, which is:
* Copyright (c) 2019 Vestas Wind Systems A/S
* Copyright (c) 2018, NXP
* Copyright 2018, 2025 NXP
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -13,6 +13,7 @@
#include <zephyr/drivers/watchdog.h>
#include <zephyr/irq.h>
#include <zephyr/sys_clock.h>
#include <zephyr/pm/device.h>
#include <fsl_wwdt.h>
#include <fsl_clock.h>
@ -32,6 +33,7 @@ struct mcux_wwdt_data {
wdt_callback_t callback;
wwdt_config_t wwdt_config;
bool timeout_valid;
bool active_before_sleep;
};
static int mcux_wwdt_setup(const struct device *dev, uint8_t options)
@ -59,6 +61,7 @@ static int mcux_wwdt_disable(const struct device *dev)
WWDT_Deinit(base);
data->timeout_valid = false;
data->active_before_sleep = false;
LOG_DBG("Disabled the watchdog");
return 0;
@ -167,13 +170,52 @@ static void mcux_wwdt_isr(const struct device *dev)
}
}
/*
* Power Management:
* When the system enters sleep mode, this driver maintains awareness
* of whether the WWDT was active. After wake up, the WDT counter
* resets to its reload value.
*/
static int mcux_wwdt_driver_pm_action(const struct device *dev,
enum pm_device_action action)
{
const struct mcux_wwdt_config *config = dev->config;
struct mcux_wwdt_data *data = dev->data;
int err = 0;
switch (action) {
case PM_DEVICE_ACTION_RESUME:
break;
case PM_DEVICE_ACTION_TURN_ON:
if (data->active_before_sleep) {
err = mcux_wwdt_setup(dev, 0);
data->active_before_sleep = false;
}
break;
case PM_DEVICE_ACTION_SUSPEND:
break;
case PM_DEVICE_ACTION_TURN_OFF:
if (config->base->MOD & WWDT_MOD_WDEN_MASK) {
data->active_before_sleep = true;
}
break;
default:
err = -ENOTSUP;
}
return err;
}
static int mcux_wwdt_init(const struct device *dev)
{
const struct mcux_wwdt_config *config = dev->config;
/* The rest of the device init is done from the
* PM_DEVICE_ACTION_TURN_ON in the pm callback
* which is invoked by pm_device_driver_init.
*/
config->irq_config_func(dev);
return 0;
return pm_device_driver_init(dev, mcux_wwdt_driver_pm_action);
}
static DEVICE_API(wdt, mcux_wwdt_api) = {
@ -194,8 +236,10 @@ static const struct mcux_wwdt_config mcux_wwdt_config_0 = {
static struct mcux_wwdt_data mcux_wwdt_data_0;
PM_DEVICE_DT_INST_DEFINE(0, mcux_wwdt_driver_pm_action);
DEVICE_DT_INST_DEFINE(0, &mcux_wwdt_init,
NULL, &mcux_wwdt_data_0,
PM_DEVICE_DT_INST_GET(0), &mcux_wwdt_data_0,
&mcux_wwdt_config_0, POST_KERNEL,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&mcux_wwdt_api);