Ok, I got something working, partly by luck, and partly by intuition. I
still do not know what the hell I'm doing with device tree files . . . but
everything makes sense.
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "WH-ADC";
version = "00A0";
fragment@0 {
target = <&tscadc>;
__overlay__ {
compatible = "uio";
uio-alias = "adc";
status = "okay";
};
};
};
$ dtc -O dtb -o WH-ADC-00A0.dtbo -b 0 -@ WH-ADC-00A0.dts
$ sudo cp WH-ADC-00A0.dtbo /lib/firmware/
$ sudo sh -c "echo 'WH-ADC' > /sys/devices/platform/bone_capemgr/slots"
$ dmesg | grep WH-ADC
[ 1290.096328] bone_capemgr bone_capemgr: part_number 'WH-ADC', version
'N/A'
[ 1290.116039] bone_capemgr bone_capemgr: slot #5: 'Override Board
Name,00A0,Override Manuf,WH-ADC'
[ 1290.137733] bone_capemgr bone_capemgr: slot #5: dtbo 'WH-ADC-00A0.dtbo'
loaded; overlay id #0
$ ls /dev/uio
adc
$ ./lsuio
uio0: name=tscadc, version=devicetree, events=0
map[0]: addr=0x44E0D000, size=4096
--
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