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

[Vijay S]

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>;

        };

 

 

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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