[fedora-arm] rasberrypi 3 and ds1307 or ds3231

Peter Robinson

2017-01-07 05:48:13 UTC

Post by p***@ossi.co.uk
im using fedora 25 on both a rasberrypi2 and a 3
I also have a ds1307 in the rasberrypi2 and it works fine.
however ive tried first a ds1307 in the rasberry pi 3 and now a ds3231
neither show up in i2cdetect -y 0 or 1 or 2
i get messages as follows in dmesg
dmesg | grep rtc
[ 5.730955] hctosys: unable to open rtc device (rtc0)
[ 22.881692] rtc-ds1307: probe of 2-0068 failed with error
[ 22.892945] rtc-ds1307: probe of 1-0068 failed with error -5
is there a problem with the pi3 and fedora25 and i2c

There's a GPIO MUX device on the RPi3 that's not on the 2 which is
used to deal with some bits around the WiFi/BT changes while keeping
the 40 pin connector compatible. It might be that you need to adjust
the pinmux depending on which i2c pins you're using. I'm not exactly
sure of the details and some of it is hidden behind the firmware.
This should be fixed when 4.9.x lands in stable, else you could try a
4.10 rcX release too.

Post by p***@ossi.co.uk
[ 1300.005255] i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100
[ 1300.006707] i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100
[ 1300.008158] i2c-bcm2835 3f805000.i2c: i2c transfer failed: 100
lsmod|grep i2c
i2c_dev 16384 0
i2c_bcm2835 16384 0
if this is just something i need to wait for development , then thats fine, just want to be sure its not me.
regards peter
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