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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