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[Backport v4.3-branch] drivers: uart: save individual uart instances interrupts in PM Action #101152

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[Backport v4.3-branch] drivers: uart: save individual uart instances interrupts in PM Action #101152

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drivers: uart: save interrupts in PM Action
davidmissael Nov 27, 2025
c5eeda4
drivers: uart: save interrupts in PM Action
davidmissael Dec 2, 2025
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7 changes: 4 additions & 3 deletions drivers/serial/uart_mcux_flexcomm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,7 @@ struct mcux_flexcomm_data {
bool pm_policy_state_lock;
struct k_work pm_lock_work;
#endif
uint32_t usart_intenset;
};

#ifdef CONFIG_PM_POLICY_DEVICE_CONSTRAINTS
Expand Down Expand Up @@ -1205,10 +1206,10 @@ static void mcux_flexcomm_pm_restore_wake(const struct device *dev,
}
#endif /* FC_UART_IS_WAKEUP */

static uint32_t usart_intenset;
static int mcux_flexcomm_pm_action(const struct device *dev, enum pm_device_action action)
{
const struct mcux_flexcomm_config *config = dev->config;
struct mcux_flexcomm_data *data = dev->data;
int ret;

switch (action) {
Expand All @@ -1217,14 +1218,14 @@ static int mcux_flexcomm_pm_action(const struct device *dev, enum pm_device_acti
case PM_DEVICE_ACTION_SUSPEND:
break;
case PM_DEVICE_ACTION_TURN_OFF:
usart_intenset = USART_GetEnabledInterrupts(config->base);
data->usart_intenset = USART_GetEnabledInterrupts(config->base);
break;
case PM_DEVICE_ACTION_TURN_ON:
ret = mcux_flexcomm_init_common(dev);
if (ret) {
return ret;
}
USART_EnableInterrupts(config->base, usart_intenset);
USART_EnableInterrupts(config->base, data->usart_intenset);
break;
default:
return -ENOTSUP;
Expand Down
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