Figured it out....
To enable the ADC in the global device tree file (am335x-boneblack.dts) I
needed to replace this:
713 tscadc@44e0d000 {
714 compatible = "ti,ti-tscadc";
715 reg = <0x44e0d000 0x1000>;
716 interrupt-parent = <0x1>;
717 interrupts = <0x10>;
718 ti,hwmods = "adc_tsc";
719 status = "disabled";
720 linux,phandle = <0x3d>;
721 phandle = <0x3d>;
722 };
with this:
713 tscadc@44e0d000 {
714 compatible = "ti,ti-tscadc";
715 reg = <0x44e0d000 0x1000>;
716 interrupt-parent = <0x1>;
717 interrupts = <0x10>;
718 ti,hwmods = "adc_tsc";
719 status = "okay";
720 linux,phandle = <0x3d>;
721 phandle = <0x3d>;
722
723 adc{
724 ti,adc-channels = <0 1 2 3 4 5 6 7>;
725 };
726 };
basically enable the tsadc peripheral (status = "okay") and add an adc
section listing all channels to be used.
On Sunday, May 25, 2014 7:48:22 PM UTC-4, [email protected] wrote:
>
> Hello all,
> I'm trying to get in the habit of enabling all the hardware that I need on
> the beaglebone black via modifying the main device tree
> file am335x-boneblack.dts which I derive with the dtc from the
> am335x-boneblack.dtb file available under /boot/dtbs or /boot/uboot/dtbs in
> a Debian installation. I'm specifically trying to avoid device tree
> overlays and using the cape manager altogether. I've had success with
> GPIO, SPI, I2C, UART and PWM but I'm unable to get this to work for the
> ADC.
>
> In the am335x-boneblack.dts file the only section that relates to the ADC
> is:
>
>
> 713 tscadc@44e0d000 {
> 714 compatible = "ti,ti-tscadc";
> 715 reg = <0x44e0d000 0x1000>;
> 716 interrupt-parent = <0x1>;
> 717 interrupts = <0x10>;
> 718 ti,hwmods = "adc_tsc";
> 719 status = "disabled";
> 720 linux,phandle = <0x3d>;
> 721 phandle = <0x3d>;
> 722 };
>
> For some insight I took a peak at the BB-ADC-00A0.dts (again created from
> the BB-ADC-00A0.dtb file in /lib/firmware via the dtc)
>
> 1 /dts-v1/;
> 2
> 3 / {
> 4 compatible = "ti,beaglebone", "ti,beaglebone-black";
> 5 part-number = "BB-ADC";
> 6 exclusive-use = "P9.39", "P9.40", "P9.37", "P9.38", "P9.33",
> "P9.36", "P9.35", "tscadc";
> 7
> 8 fragment@0 {
> 9 target = <0xdeadbeef>;
> 10
> 11 __overlay__ {
> 12 #address-cells = <0x1>;
> 13 #size-cells = <0x1>;
> 14
> 15 tscadc {
> 16 compatible = "ti,ti-tscadc";
> 17 reg = <0x44e0d000 0x1000>;
> 18 interrupt-parent = <0xdeadbeef>;
> 19 interrupts = <0x10>;
> 20 ti,hwmods = "adc_tsc";
> 21 status = "okay";
> 22
> 23 adc {
> 24 ti,adc-channels = <0x0 0x1 0x2 0x3 0x4 0x5 0x6
> 0x7>;
> 25 };
> 26 };
> 27
> 28 helper {
> 29 compatible = "bone-iio-helper";
> 30 vsense-name = "AIN0", "AIN1", "AIN2", "AIN3", "AIN4",
> "AIN5", "AIN6", "AIN7";
> 31 vsense-scale = <0x64 0x64 0x64 0x64 0x64 0x64 0x64
> 0x64>;
> 32 status = "okay";
> 33 linux,phandle = <0x1>;
> 34 phandle = <0x1>;
> 35 };
> 36 };
> 37 };
>
> In additions to enabling the tscadc section and adding an adc section
> within the tscadc section, the ADC device overlay seems to create a
> 'helper' section with the 'bone-iio-helper' driver. What exactly is the
> purpose of this section? I'm having trouble integrating this section
> directly into the main am335x-boneblack.dtb file. Any ideas on how to do
> this or enable the adc in the main device tree file in general, would be
> highly appreciated.
>
> Hussam
>
>
>
>
--
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