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rtc: select 24-hour mode before a time write, and take no time in 12-hour mode (iteration branch) - #52

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ptr727 wants to merge 11 commits into

devfrom

work/rtc-24h-mode

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rtc: select 24-hour mode before a time write, and take no time in 12-hour mode (iteration branch)#52
ptr727 wants to merge 11 commits into
devfrom
work/rtc-24h-mode

Commits on Oct 6, 2026
- rtc: select 24-hour mode before a time write, and take no time in 12-hour mode
  
  ptr727
  and
  claude
  committed
  dde2618
- rtc: clear the 12-hour bit only on the adopted chip, and never from a bad read
  
  ptr727
  and
  claude
  committed
  52d83b9
- rtc: read an all-1s 12-hour mode register as unreadable
  
  ptr727
  and
  claude
  committed
  e6d568b
- rtc: refuse a 12-hour mode register read that shows a bit reading 0
  
  ptr727
  and
  claude
  committed
  235c3c0
- Merge upstream dev (81d98ab) into work/rtc-24h-mode
  
  ptr727
  and
  claude
  committed
  b18542c
- rtc: require a zero bit for an out-of-block twelve-hour-bit
  
  ptr727
  and
  claude
  committed
  d927e93
- rtc: leave the 12-hour bit to the next save, and reject a zero byte over it
  
  ptr727
  and
  claude
  committed
  70def66
- rtc: require bit 0 out of block, the hours register in block, and a mode bit
  
  ptr727
  and
  claude
  committed
  9a42030
- rtc: honour twelve-hour-bit's zero bits in the time block too
  
  ptr727
  and
  claude
  committed
  59ba354
- rtc: read back the 12-hour clear and repair a torn write
  
  ptr727
  and
  claude
  committed
  74c7e0c
- rtc: promise a sync only for the RTC it will write
  
  ptr727
  and
  claude
  committed
  c18e1f0