4  * SPDX-License-Identifier: Apache-2.0
40  * additionally to the internal divider, the clock is divided by a
54  *  - t_WWDG: WWDG timeout
55  *  - counter: a value in [0x40, 0x7F] representing the cycles before timeout.
59  *  - f_WWDG: the frequency of the WWDG clock. This can be calculated by the
63  *     - f_PCLK: the clock frequency of the system
64  *     - 4096: the constant internal divider
65  *     - prescaler: the programmable divider with valid values of 1, 2, 4 or 8,
69  *  - counter = 0x40
70  *  - prescaler = 1
72  *  - counter = 0x7F
73  *  - prescaler = 8
82 #define ABS_DIFF_UINT(a, b)  ((a) > (b) ? (a) - (b) : (b) - (a))
85 	(__TIMEOUT__ - __TIMEOUT_GOLDEN__) < \
92 	const struct device *const clk = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);  in wwdg_stm32_get_pclk()  local
96 	if (clock_control_get_rate(clk, (clock_control_subsys_t) &cfg->pclken,  in wwdg_stm32_get_pclk()
99 		return -EIO;  in wwdg_stm32_get_pclk()
117 	uint32_t divider = WWDG_INTERNAL_DIVIDER * (1 << prescaler_exp);  in wwdg_stm32_get_timeout()  local
118 	float f_wwdg = (float)wwdg_stm32_get_pclk(dev) / divider;  in wwdg_stm32_get_timeout()
150 		*counter = (uint32_t)(timeout_s * wwdg_freq + 1) - 1;  in wwdg_stm32_convert_timeout()
186 		return -ENOTSUP;  in wwdg_stm32_setup()
203 	return -EPERM;  in wwdg_stm32_disable()
211 	uint32_t timeout = config->window.max * USEC_PER_MSEC;  in wwdg_stm32_install_timeout()
216 	if (config->callback != NULL) {  in wwdg_stm32_install_timeout()
217 		data->callback = config->callback;  in wwdg_stm32_install_timeout()
230 		return -EINVAL;  in wwdg_stm32_install_timeout()
233 	data->counter = counter;  in wwdg_stm32_install_timeout()
255 	LL_WWDG_SetCounter(wwdg, data->counter);  in wwdg_stm32_feed()
268 			data->callback(dev, 0);  in wwdg_stm32_isr()
282 	const struct device *const clk = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);  in wwdg_stm32_init()  local
285 	if (!device_is_ready(clk)) {  in wwdg_stm32_init()
287 		return -ENODEV;  in wwdg_stm32_init()
290 	if (clock_control_on(clk, (clock_control_subsys_t)&cfg->pclken) != 0) {  in wwdg_stm32_init()
292 		return -EIO;  in wwdg_stm32_init()