rtc: rzn1: implement one-second accuracy for alarms

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The hardware alarm only supports one-minute accuracy which is coarse and
disables UIE usage. Use the 1-second interrupt to achieve per-second
accuracy. It is activated once we hit the per-minute alarm. The new
feature is optional. When there is no 1-second interrupt, old behaviour
with per-minute accuracy is used as before. With this feature, all tests
of 'rtctest' are successfully passed.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20250305101038.9933-2-wsa+renesas@sang-engineering.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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Wolfram Sang 2025-03-05 11:08:16 +01:00 • committed by Alexandre Belloni

parent 0a243de9d0

commit eea7791e00

1 changed files with 91 additions and 17 deletions

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drivers/rtc/rtc-rzn1.c

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