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drivers: timer: st_stm32: add lptimer management to stm32l5 series

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This patch introduces the support of the LowPower Timer
for the STM32L5xx from STMicroelectronics.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2021-03-09 11:04:09 +01:00 • committed by Anas Nashif
commit 9d2aead97b
2 changed files with 5 additions and 1 deletions
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2
drivers/timer/Kconfig.stm32_lptim
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@ -5,7 +5,7 @@
menuconfig STM32_LPTIM_TIMER
bool "STM32 Low Power Timer [EXPERIMENTAL]"
depends on (SOC_SERIES_STM32L4X || SOC_SERIES_STM32WBX)
depends on (SOC_SERIES_STM32L4X || SOC_SERIES_STM32L5X || SOC_SERIES_STM32WBX)
depends on CLOCK_CONTROL && PM
select TICKLESS_CAPABLE
help

4
drivers/timer/stm32_lptim_timer.c
View file

@ -105,6 +105,7 @@ int sys_clock_driver_init(const struct device *dev)
/* Enable the power interface clock */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
#endif /* LL_APB1_GRP1_PERIPH_PWR */
/* enable backup domain */
LL_PWR_EnableBkUpAccess();
@ -114,6 +115,9 @@ int sys_clock_driver_init(const struct device *dev)
while (!LL_RCC_LSE_IsReady()) {
/* Wait for LSE ready */
}
#ifdef RCC_BDCR_LSESYSEN
LL_RCC_LSE_EnablePropagation();
#endif /* RCC_BDCR_LSESYSEN */
LL_RCC_SetLPTIMClockSource(LL_RCC_LPTIM1_CLKSOURCE_LSE);
#endif /* CONFIG_STM32_LPTIM_CLOCK_LSI */