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.ti...@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 -- 2.40.0