Date: Wed, 03 Feb 2016 08:27:08 -0700 From: Ian Lepore <ian@freebsd.org> To: Emmanuel Vadot <manu@bidouilliste.com>, Jukka Ukkonen <jau789@gmail.com> Cc: freebsd-arm <freebsd-arm@FreeBSD.org> Subject: Re: ds3231 suddenly failing Message-ID: <1454513228.1736.6.camel@freebsd.org> In-Reply-To: <20160203155644.29677e6b6e35bc9f9462e678@bidouilliste.com> References: <56B21158.80401@gmail.com> <20160203155644.29677e6b6e35bc9f9462e678@bidouilliste.com>
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On Wed, 2016-02-03 at 15:56 +0100, Emmanuel Vadot wrote: > Hi, > > 0xd0 is the 7-bit address while 0x1a0 is the 8-bits address so > nothing is wrong here. > No, that's incorrect. 0x1a0 is not a valid i2c address. The address of a Maxim DS3231 is 0b1101000x; 0xd0 when expressing addresses as 8 -bit, or 0x68 when expressing them as 7-bit. -- Ian > 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" > >
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