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soc: arm: stm32: configure LDO supply on H7 init

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Configure the LDO supply when initializing H7 (M7) SoC. I have
observed MCU hanging on LL_PWR_IsActiveFlag_VOS() wait loop when
doing a cold boot if LDO supply is not explicitely enabled.
According to the datasheet LDO should be enabled by default,
however HAL examples also configure LDO, so there may be a
reason to perform such step.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
This commit is contained in:
Gerard Marull-Paretas 2020-03-07 16:35:17 +01:00 • committed by Maureen Helm
commit 5df13cb910
1 changed files with 2 additions and 0 deletions
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soc/arm/st_stm32/stm32h7/soc_m7.c
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@ -88,6 +88,8 @@ static int stm32h7_init(struct device *arg)
/* Power Configuration */
#ifdef SMPS
LL_PWR_ConfigSupply(LL_PWR_DIRECT_SMPS_SUPPLY);
#else
LL_PWR_ConfigSupply(LL_PWR_LDO_SUPPLY);
#endif
LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
while (LL_PWR_IsActiveFlag_VOS() == 0) {