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drivers: stm32-rtc: return -ENODATA when RTC is uninitialized

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rtc_get_time() on STM32 does not implement the -ENODATA return code.
This prevents testing the initialisation status of the RTC.

Fixed by reading INITS flag and adding a error path in
rtc_stm32_get_time().

Signed-off-by: Adrien Bruant <adrien.bruant@aalberts-hfc.com>
This commit is contained in:
Adrien Bruant 2023-10-09 10:42:19 +02:00 • committed by Carles Cufí
commit 9e8c00f28c
1 changed files with 9 additions and 0 deletions
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9
drivers/rtc/rtc_ll_stm32.c
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@ -259,6 +259,15 @@ static int rtc_stm32_get_time(const struct device *dev, struct rtc_time *timeptr
return err;
}
if (!LL_RTC_IsActiveFlag_INITS(RTC)) {
/* INITS flag is set when the calendar has been initialiazed. This flag is
* reset only on backup domain reset, so it can be read after a system
* reset to check if the calendar has been initialized.
*/
k_mutex_unlock(&data->lock);
return -ENODATA;
}
do {
/* read date, time and subseconds and relaunch if a day increment occurred
* while doing so as it will result in an erroneous result otherwise