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drivers: gpio: stm32: support wkup pins configuration

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Introduce a custom STM32_GPIO_WKUP GPIO flag.
Use the newly introduced stm32_pwr_wkup_pin_cfg_gpio() public
function to configure GPIO pins, that have the STM32_GPIO_WKUP
flag in DT, as sources for STM32 PWR wake-up pins, on the condition
that there is a wake-up pin that corresponds to each of them.
These GPIO pins can then be used to power on the system after Poweroff
like a reset pin.

Signed-off-by: Abderrahmane Jarmouni <abderrahmane.jarmouni-ext@st.com>
This commit is contained in:
Abderrahmane Jarmouni 2024-05-21 01:35:31 +02:00 committed by David Leach
parent 559c72d7a6
commit efc209b47f
2 changed files with 56 additions and 0 deletions
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25
drivers/gpio/gpio_stm32.c
View file

@ -22,11 +22,17 @@
#include <zephyr/drivers/interrupt_controller/exti_stm32.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/device_runtime.h>
#include <zephyr/drivers/misc/stm32_wkup_pins/stm32_wkup_pins.h>
#include <zephyr/dt-bindings/gpio/stm32-gpio.h>
#include "stm32_hsem.h"
#include "gpio_stm32.h"
#include <zephyr/drivers/gpio/gpio_utils.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(stm32, CONFIG_GPIO_LOG_LEVEL);
/**
* @brief Common GPIO driver for STM32 MCUs.
*/
@ -541,6 +547,25 @@ static int gpio_stm32_config(const struct device *dev,
gpio_stm32_configure_raw(dev, pin, pincfg, 0);
#ifdef CONFIG_STM32_WKUP_PINS
if (flags & STM32_GPIO_WKUP) {
#ifdef CONFIG_POWEROFF
struct gpio_dt_spec gpio_dt_cfg = {
.port = dev,
.pin = pin,
.dt_flags = (gpio_dt_flags_t)flags,
};
if (stm32_pwr_wkup_pin_cfg_gpio((const struct gpio_dt_spec *)&gpio_dt_cfg)) {
LOG_ERR("Could not configure GPIO %s pin %d as a wake-up source",
gpio_dt_cfg.port->name, gpio_dt_cfg.pin);
}
#else
LOG_DBG("STM32_GPIO_WKUP flag has no effect when CONFIG_POWEROFF=n");
#endif /* CONFIG_POWEROFF */
}
#endif /* CONFIG_STM32_WKUP_PINS */
/* Release clock only if pin is disconnected */
if (((flags & GPIO_OUTPUT) == 0) && ((flags & GPIO_INPUT) == 0)) {
err = pm_device_runtime_put(dev);

31
include/zephyr/dt-bindings/gpio/stm32-gpio.h Normal file
View file

@ -0,0 +1,31 @@
/*
* Copyright (c) 2024 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_DT_BINDINGS_GPIO_STM32_GPIO_H_
#define ZEPHYR_INCLUDE_DT_BINDINGS_GPIO_STM32_GPIO_H_
/**
* @brief STM32 GPIO specific flags
*
* The driver flags are encoded in the 8 upper bits of @ref gpio_dt_flags_t as
* follows:
*
* - Bit 8: Configure a GPIO pin to power on the system after Poweroff.
*
* @ingroup gpio_interface
* @{
*/
/**
* Configures a GPIO pin to power on the system after Poweroff.
* This flag is reserved to GPIO pins that are associated with wake-up pins
* in STM32 PWR devicetree node, through the property "wkup-gpios".
*/
#define STM32_GPIO_WKUP (1 << 8)
/** @} */
#endif /* ZEPHYR_INCLUDE_DT_BINDINGS_GPIO_STM32_GPIO_H_ */