I followed the steps to create a beaglebone found here:
http://www.jumpnowtek.com/beaglebone/BeagleBone-Systems-with-Yocto.html
They worked like a charm, thanksyou junponowtek.
And then followed this doc to try and get the ADC available:
http://processors.wiki.ti.com/index.php/Linux_Core_ADC_Users_Guide
I loaded the module and it shows up in lsmod along with other modules it
brings in:
# lsmod
Module Size Used by
ti_am335x_adc 16384 0
kfifo_buf 16384 1 ti_am335x_adc
industrialio 57344 2 ti_am335x_adc,kfifo_buf
ti_am335x_tscadc 16384 1 ti_am335x_adc
My arch/arm/boot/dts/am335x-evm.dts file shows
&tscadc {
status = "okay";
tsc {
ti,wires = <4>;
ti,x-plate-resistance = <200>;
ti,coordinate-readouts = <5>;
ti,wire-config = <0x00 0x11 0x22 0x33>;
ti,charge-delay = <0x400>;
};
adc {
ti,adc-channels = <4 5 6 7>;
};
};
According to the doc above loading the module should create the following:
>On loading the module you would see the IIO device created
root@arago-armv7:~# ls -al /sys/bus/iio/devices/iio\:device0/
drwxr-xr-x 5 root root 0 Nov 1 22:06 .
drwxr-xr-x 4 root root 0 Nov 1 22:06 ..
drwxr-xr-x 2 root root 0 Nov 1 22:06 buffer
-r--r--r-- 1 root root 4096 Nov 1 22:06 dev
-rw-r--r-- 1 root root 4096 Nov 1 22:06 in_voltage4_raw
-rw-r--r-- 1 root root 4096 Nov 1 22:06 in_voltage5_raw
-rw-r--r-- 1 root root 4096 Nov 1 22:06 in_voltage6_raw
-rw-r--r-- 1 root root 4096 Nov 1 22:06 in_voltage7_raw
-r--r--r-- 1 root root 4096 Nov 1 22:06 name
lrwxrwxrwx 1 root root 0 Nov 1 22:06 of_node ->
../../../../../../firmware/devicetree/base/ocp/tscadc@44e0d000/adc
drwxr-xr-x 2 root root 0 Nov 1 22:06 power
drwxr-xr-x 2 root root 0 Nov 1 22:06 scan_elements
lrwxrwxrwx 1 root root 0 Nov 1 22:06 subsystem ->
../../../../../../bus/iio
-rw-r--r-- 1 root root 4096 Nov 1 22:06 uevent
While the /sys/bus/iio directory got created when I loaded the module
the device directory is empty
# ls /sys/bus/iio/devices
#
What am I missing that is preventing the ADC interface from being created ?
Any pointers would be appreciated.
Thanks
Chris K
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