blob: c9e94310c3f5b74721fe1ec7bc8ea1f8101b02db [file] [log] [blame] [edit]
/*
* Copyright (c) 2023, Prevas A/S
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT ti_tps382x
#include <errno.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/watchdog.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(wdt_ti_tps382x, CONFIG_WDT_LOG_LEVEL);
struct ti_tps382x_config {
struct gpio_dt_spec wdi_gpio;
int timeout;
};
static int ti_tps382x_init(const struct device *dev)
{
const struct ti_tps382x_config *config = dev->config;
if (!gpio_is_ready_dt(&config->wdi_gpio)) {
LOG_ERR("WDI gpio not ready");
return -ENODEV;
}
return 0;
}
static int ti_tps382x_setup(const struct device *dev, uint8_t options)
{
const struct ti_tps382x_config *config = dev->config;
return gpio_pin_configure_dt(&config->wdi_gpio, GPIO_OUTPUT);
}
static int ti_tps382x_disable(const struct device *dev)
{
const struct ti_tps382x_config *config = dev->config;
/* The watchdog timer can be disabled by disconnecting the WDI pin from
* the system. Do this by changing the gpio to an input (tri-state).
*/
return gpio_pin_configure_dt(&config->wdi_gpio, GPIO_INPUT);
}
static int ti_tps382x_install_timeout(const struct device *dev,
const struct wdt_timeout_cfg *cfg)
{
const struct ti_tps382x_config *config = dev->config;
if (cfg->window.max != config->timeout) {
LOG_ERR("Upper limit of watchdog timeout must be %d not %u",
config->timeout, cfg->window.max);
return -EINVAL;
} else if (cfg->window.min != 0) {
LOG_ERR("Window timeouts not supported");
return -EINVAL;
} else if (cfg->callback != NULL) {
LOG_ERR("Callbacks not supported");
return -EINVAL;
}
return 0;
}
static int ti_tps382x_feed(const struct device *dev, int channel_id)
{
const struct ti_tps382x_config *config = dev->config;
return gpio_pin_toggle_dt(&config->wdi_gpio);
}
static const struct wdt_driver_api ti_tps382x_api = {
.setup = ti_tps382x_setup,
.disable = ti_tps382x_disable,
.install_timeout = ti_tps382x_install_timeout,
.feed = ti_tps382x_feed,
};
#define WDT_TI_TPS382X_INIT(n) \
static const struct ti_tps382x_config ti_tps382x_##n##config = { \
.wdi_gpio = GPIO_DT_SPEC_INST_GET(n, wdi_gpios), \
.timeout = DT_INST_PROP(n, timeout_period), \
}; \
\
DEVICE_DT_INST_DEFINE( \
n, ti_tps382x_init, NULL, NULL, &ti_tps382x_##n##config, \
POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
&ti_tps382x_api \
);
DT_INST_FOREACH_STATUS_OKAY(WDT_TI_TPS382X_INIT);