[PATCH v2 0/2] max313xx RTC driver

[Chris Packham]

This series is based on the in-flight linux patch that is adding support
for this family of RTCs to linux[1]. The u-boot driver is a bit
different due to some of the differences between Linux and u-boot and
I've dropped the support for hwmon and clock source functions. Where
possible I've tried to keep things such that the U-Boot and Linux
versions can be compared and kept in sync.

For reference the datasheets are all available at

https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31328.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31329.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31331.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31334.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31341B-MAX31341C.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31342.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31343.pdf

[1] - https://lore.kernel.org/all/20221108122254.1185-2-Ibrahim.Tilki@analog.com/

Changes in v2:
- Add note on which Linux version this came from
- Collect review from Simon
- Enable in sandbox for compile testing
- Note feature omissions in Kconfig
- Incorporate review comments from Simon
- Collect r-by from Simon

Chris Packham (2):
  include: kernel.h: port find_closest() from Linux
  drivers: rtc: add max313xx series rtc driver

 configs/sandbox_defconfig |   1 +
 drivers/rtc/Kconfig       |  13 ++
 drivers/rtc/Makefile      |   1 +
 drivers/rtc/max313xx.c    | 459 ++++++++++++++++++++++++++++++++++++++
 include/linux/kernel.h    |  24 ++
 5 files changed, 498 insertions(+)
 create mode 100644 drivers/rtc/max313xx.c

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2.40.0