Reg:Trying to get the ADC working on the Beaglebone with 3.8 kernel

[Anil Kumar]

Hi Vijay,

On Tue, Feb 12, 2013 at 6:49 PM, Vijay S <vijay at mistralsolutions.com> wrote:
> Hi,
>
> Am trying to get the ADC working on the beagle bone. Have cloned/pulled the
> latest kernel from the following branch
> https://github.com/beagleboard/kernel/tree/3.8 , applied the patches and
> built the kernel.
>
>
>
> Have included the below structure under the am335x-bone-common.dtsi
> (attached herewith is the dts file for your reference)
>
>
>
> tscadc at 44e0d000 {
>
>                                     status = "okay";
>
>                                     compatible = "ti,ti-tscadc";
>
>                                     reg = <0x44e0d000 0x1000>;
>
>                         interrupt-parent = <&intc>;
>
>                         interrupts = <16>;
>
>                         ti,hwmods = "adc_tsc";
>
>             };
>
>
>
> &tscadc {
>
>         tsc {
>
>               ti,wires = <4>;
>
>             ti,x-plate-resistance = <200>;
>
>                ti,steps-to-configure = <5>;
>
>              ti,wire-config = <0x00 0x11 0x22 0x33>;
>
>         };
>
>
>
>         adc {
>
>                 ti,adc-channels = <8>;
>
>         };
>

have you done pin mux for this ?

>
>
>
>
> The device is getting registered( [1.578678] input: ti-tsc as
> /devices/ocp.2/44e0d000.tscadc/tsc/input/input0
>
> [    1.586799] tsc tsc: Initialized OK) as can be seen from the attached
> kernel log(3.8_kernel_ts_adc_sys_iio_devices.txt).
>
>
>
> Am able to view the "tiadc" under the devices in the following path  cat
> /sys/devices/ocp.2/44e0d000.tscadc/tiadc/iio\:device0/  and cat
> /sys/bus/iio/devices/iio\:device0/ , but am not able to list out
> "in_voltageX_raw" in either of the paths.
>
>
>
> Can you please suggest if am missing anything?
>
>
>
> Regards,
>
> Vijay
>
>
>
>
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