[Bug 266093] [nxprtc] My PCF8523 fails to initialize properly after 2444018f7dd3c0ecd1099d63de0a856e7f6b1984

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266093

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=e2386f18eca2f6f75f7c5c2d49d603e3d2674509

commit e2386f18eca2f6f75f7c5c2d49d603e3d2674509
Author:     Tetsuya Uemura <t_uemura@macome.co.jp>
AuthorDate: 2022-09-14 13:34:15 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2022-09-14 13:34:15 +0000

    nxprtc: Fix timing issue with register access.

    My Adafruit PCF8523 RTC on either RPi2B or RPi3B+ failed to work around
    80 ~ 90 % of boot-ups, by printing the following log lines.

    nxprtc0: <NXP PCF8523 RTC> at addr 0xd0 on iicbus0
    nxprtc0: cannot set up timer
    Warning: no time-of-day clock registered, system time will not be set
accurately

    This is due to pcf8523_start_timer(sc) returned non-zero in
    nxprtc_start() due to a register read failure of PCF8523_R_TMR_A_FREQ or
    PCF8523_R_TMR_CLKOUT or a failure to program a new value.

    The pause_sbt("nxpbat") sleep was too short and caused the register
    access failures.

    PR: 266093

 sys/dev/iicbus/nxprtc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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