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drivers: clock_control: stm32u5: enable backup access before enabling lsi

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LSI needs write access to backup domain to be enabled.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
This commit is contained in:
Guillaume Gautier 2023-09-28 16:55:10 +02:00 committed by Carles Cufí
parent 72ec6ce4db
commit 85fa6746de
1 changed files with 15 additions and 0 deletions
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15
drivers/clock_control/clock_stm32_ll_u5.c
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@ -770,10 +770,25 @@ static void set_up_fixed_clock_sources(void)
}
if (IS_ENABLED(STM32_LSI_ENABLED)) {
if (!LL_AHB3_GRP1_IsEnabledClock(LL_AHB3_GRP1_PERIPH_PWR)) {
/* Enable the power interface clock */
LL_AHB3_GRP1_EnableClock(LL_AHB3_GRP1_PERIPH_PWR);
}
if (!LL_PWR_IsEnabledBkUpAccess()) {
/* Enable write access to Backup domain */
LL_PWR_EnableBkUpAccess();
while (!LL_PWR_IsEnabledBkUpAccess()) {
/* Wait for Backup domain access */
}
}
/* Enable LSI oscillator */
LL_RCC_LSI_Enable();
while (LL_RCC_LSI_IsReady() != 1) {
}
LL_PWR_DisableBkUpAccess();
}
if (IS_ENABLED(STM32_HSI48_ENABLED)) {