Date: Wed, 3 Feb 2016 15:56:44 +0100 From: Emmanuel Vadot <manu@bidouilliste.com> To: Jukka Ukkonen <jau789@gmail.com> Cc: freebsd-arm <freebsd-arm@FreeBSD.org> Subject: Re: ds3231 suddenly failing Message-ID: <20160203155644.29677e6b6e35bc9f9462e678@bidouilliste.com> In-Reply-To: <56B21158.80401@gmail.com> References: <56B21158.80401@gmail.com>
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Hi, 0xd0 is the 7-bit address while 0x1a0 is the 8-bits address so nothing is wrong here. i2c -s doesn't show anything because rpi only support I2C_RDRW ioctl. If you want to confirm that your device is ok you can patch i2c(8) with this diff : https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198817 You do not need to recompile the kernel, just i2c(8). On Wed, 3 Feb 2016 16:40:24 +0200 Jukka Ukkonen <jau789@gmail.com> wrote: > > Hello all, > > Previously my RPI2 had no problems with ds3231 RTC. > Now 11.0-CURRENT r295206 shows these during boot... > > ds32310: <Maxim DS3231 RTC> at addr 0x1a0 on iicbus1 > ds32310: cannot read from RTC. > > Trying sysctl dev.ds3231 gives me this... > > dev.ds3231.0.%parent: iicbus1 > dev.ds3231.0.%pnpinfo: name=rtc compat=maxim,ds3231 > dev.ds3231.0.%location: addr=0x1a0 > dev.ds3231.0.%driver: ds3231 > dev.ds3231.0.%desc: Maxim DS3231 RTC > dev.ds3231.%parent: > > Trying "i2c -s" does not show anything on either > /dev/iic0 or /dev/iic1. > > AFAIK I have not changed anything in the build. > > Checking the contents of rpi2.dtb says this about > the clock chip... > > rtc { > compatible = "maxim,ds3231"; > reg = <0xd0>; > }; > > I guess that the alert "cannot read from RTC." is > due to the fact that "addr 0x1a0" does not match > "reg = <0xd0>;" in the DTB. It just does not dawn > to me where the kernel found the alternate value. > Any ideas? > > --jau > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" -- Emmanuel Vadot <manu@bidouilliste.com>
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