[Bug 266093] [nxprtc] My PCF8523 fails to initialize properly after 2444018f7dd3c0ecd1099d63de0a856e7f6b1984
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Date: Mon, 29 Aug 2022 06:34:12 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266093 Bug ID: 266093 Summary: [nxprtc] My PCF8523 fails to initialize properly after 2444018f7dd3c0ecd1099d63de0a856e7f6b1984 Product: Base System Version: 13.1-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: t_uemura@macome.co.jp I've noticed that on 13.1-STABLE stable/13-n251859-8d4ccb9da29-dirty, 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 The following log could be seen rarely but on successful boot-ups. nxprtc0: <NXP PCF8523 RTC> at addr 0xd0 on iicbus0 nxprtc0: registered as a time-of-day clock, resolution 0.015625s I've tried the same kernel but with the old 18cd8a2df868a3a7154172348f8bc61f699e78d4 nxprtc.ko and found it worked like a charm. The next revision 2444018f7dd3c0ecd1099d63de0a856e7f6b1984 seemed to introduce a hitch. "cannot set up timer" was printed because pcf8523_start_timer(sc) returned non-zero in nxprtc_start(), so I've added some device_printf() calls and observed that one of the following register access failed. read_reg(sc, PCF8523_R_TMR_A_FREQ, &tmrfreq) read_reg(sc, PCF8523_R_TMR_CLKOUT, &clkout) write_reg(sc, sc->tmcaddr, 0) pcf8523_start_timer() itself was unmodified in 2444018f7dd3c0ecd1099d63de0a856e7f6b1984 so I couldn't guess the root cause of the above register access failure. -- You are receiving this mail because: You are the assignee for the bug.