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drivers: serial: stm32 uart driver set EXTI line for wakeup from lowPower

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The USART or LPUART, especially on stm32wl, must set the EXTI
lines corresponding to the wakeUp source.
This LL_EXTI_LINE_xx is given by the Device Tree property.
This makes the system exiting lowpower stop mode on EXTI irq.
The LL_EXTI_LINE_x is exactly the bit(X) set.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2022-09-12 16:22:54 +02:00 committed by Fabio Baltieri
parent cb0daa3d03
commit 0e119b53c6
2 changed files with 12 additions and 2 deletions
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11
drivers/serial/uart_stm32.c
View file

@ -1694,6 +1694,10 @@ static int uart_stm32_init(const struct device *dev)
* CONFIG_PM_DEVICE=y : Controlled by pm_device_wakeup_enable()
*/
LL_USART_EnableInStopMode(config->usart);
if (config->wakeup_line != STM32_EXTI_LINE_NONE) {
/* Prepare the WAKEUP with the expected EXTI line */
LL_EXTI_EnableIT_0_31(BIT(config->wakeup_line));
}
}
#endif /* CONFIG_PM */
@ -1843,8 +1847,11 @@ static void uart_stm32_irq_config_func_##index(const struct device *dev) \
#endif
#ifdef CONFIG_PM
#define STM32_UART_PM_WAKEUP(index) \
.wakeup_source = DT_INST_PROP(index, wakeup_source),
#define STM32_UART_PM_WAKEUP(index) \
.wakeup_source = DT_INST_PROP(index, wakeup_source), \
.wakeup_line = COND_CODE_1(DT_INST_NODE_HAS_PROP(index, wakeup_line), \
(DT_INST_PROP(index, wakeup_line)), \
(STM32_EXTI_LINE_NONE)),
#else
#define STM32_UART_PM_WAKEUP(index) /* Not used */
#endif

3
drivers/serial/uart_stm32.h
View file

@ -16,6 +16,8 @@
#include <stm32_ll_usart.h>
#define STM32_EXTI_LINE_NONE 0xFFFFFFFFU
/* device config */
struct uart_stm32_config {
/* USART instance */
@ -44,6 +46,7 @@ struct uart_stm32_config {
#if defined(CONFIG_PM)
/* Device defined as wake-up source */
bool wakeup_source;
uint32_t wakeup_line;
#endif /* CONFIG_PM */
};