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drivers: clock_control: stm32wb: Lock CLK48 hsem

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On stm32wb, M0 core may enable and disable CLK48 when using RNG.
Lock related hsem to prevent M0 to disable CLK48 when it doesn't need it
anymore.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2023-01-03 14:27:26 +01:00 • committed by Fabio Baltieri
commit bef7a89823
1 changed files with 7 additions and 0 deletions
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7
drivers/clock_control/clock_stm32_ll_common.c
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@ -640,6 +640,13 @@ static void set_up_fixed_clock_sources(void)
LL_SYSCFG_VREFINT_EnableHSI48();
#endif /* CONFIG_SOC_SERIES_STM32L0X */
/*
* STM32WB: Lock the CLK48 HSEM and do not release to prevent
* M0 core to disable this clock (used for RNG on M0).
* No-op on other series.
*/
z_stm32_hsem_lock(CFG_HW_CLK48_CONFIG_SEMID, HSEM_LOCK_DEFAULT_RETRY);
LL_RCC_HSI48_Enable();
while (LL_RCC_HSI48_IsReady() != 1) {
}