26fdb84897
RTC-8583 is time-of-day clock used in some SOHO routers. This clock has only 2 bits for year values, but thanks to user SRAM it's possible to save year value and keep it up to date via driver code. Tested on Planex_MZK-W300NAG (SoC is RT2880) Submitted by: Hiroki Mori <yamori83@yahoo.co.jp> Differential Revision: https://reviews.freebsd.org/D12833