raiden00pl opened a new pull request, #21591: URL: https://github.com/apache/nuttx/pull/21591
## Summary
STM32N6 and STM32H5 had no RTC driver. Both have the same RTC IP, with
backup registers in TAMP. This PR adds one common driver for it:
common/stm32/stm32_rtcc_m33m55_v1.c.
Supported: date/time, sub-seconds, alarm A and B, periodic wakeup.
Also, the STM32F4 and STM32L1 alarm headers are replaced by the common
common/stm32/stm32_alarm.h. They declared the same API.
## Impact
- STM32N6, STM32H5: new RTC support (/dev/rtc0 on STM32N6570-DK and
STM32H573I-DK).
- STM32F4, STM32L1: alarm header moved, no functional change.
## Testing
STM32N6570-DK and STM32H573I-DK:
- set/read date, time kept across reset
- alarm A and B, read and cancel
- periodic wakeup 1 s, 250 ms, 100 ms
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