Hi all,
I’ve been developing my application using an Apalis iMX6Q 2GB IT V1.1C module. As we’re building more units, we recently got an additional shipment of Apalis modules that were a different version, V1.1Z.
ADC channels show up on the V1.1C module but not the V1.1Z module. I don’t see any IIO devices listed on the Z module at all. Did the ADC interface move to a different I2C bus with this new version?
Both installations of TorizonCore are identical. My device tree is slightly customized (although nothing that would affect ADC, I don’t think), and it is largely identical to imx6q-apalis-ixora-v1.2.dts. I’m using torizoncore-builder with the base image torizon-core-docker-apalis-imx6-Tezi_5.5.0+build.11.tar.
See below, output from two identical installations (only difference is Apalis module version number).
V1.1C Module:
lari200:~$ ls /sys/bus/iio/devices/iio:device0
dev in_voltage4_raw in_voltage6_raw in_voltage_scale of_node subsystem
in_temp8_input in_voltage5_raw in_voltage7_raw name power uevent
lari200:~$ ls /dev/apalis-adc*
/dev/apalis-adc0 /dev/apalis-adc1 /dev/apalis-adc2 /dev/apalis-adc3
lari200:~$ ls /sys/devices/soc0/soc/2100000.aips-bus/21a4000.i2c/i2c-2/2-0041
driver modalias name of_node power stmpe-adc subsystem uevent
On the Z module, there are no IIO devices listed, stmpe-adc isn’t listed on the I2C-2 bus, and no apalis-adc symlinks are present:
V1.1Z Module:
lari203:~$ ls /sys/bus/iio/devices/iio:device0
ls: cannot access '/sys/bus/iio/devices/iio:device0': No such file or directory
lari203:~$ ls /sys/bus
ac97 clockevents coresight genpd i2c mmc pci scsi serio tee usb-serial
amba clocksource cpu gpio mdio_bus mmc_rpmb pci_express sdio soc ulpi virtio
cec container event_source hid media nvmem platform serial spi usb workqueue
lari203:~$ ls /dev/apalis-adc*
ls: cannot access '/dev/apalis-adc*': No such file or directory
lari203:~$ ls /sys/devices/soc0/soc/2100000.aips-bus/21a4000.i2c/i2c-2/2-0041
modalias name of_node power subsystem uevent
I also don’t see the stmpe-adc module listed in dmesg on the Z module:
V1.1C Module:
lari200:~$ dmesg | grep adc
[ 11.025061] stmpe-adc stmpe-adc: DMA mask not set
V1.1Z Module:
lari203:~$ dmesg | grep adc
lari203:~$