Just for added measure, yes the UIO driver does work . .
william@beaglebone:~$ lsuio
uio0: name=tscadc, version=devicetree, events=0
map[0]: addr=0x44E0D000, size=4096
On Thu, Apr 21, 2016 at 9:51 PM, William Hermans <[email protected]> wrote:
> Ok, so the following does *NOT* work on a 4.4.x kernel, but does on a
> 4.1.x kernel.
>
> *Starting off with 4.4.x kernel*
>
> william@beaglebone:~$ cat ti/WH-ADC-00A0.dts
>
>
> /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";
> };
> };
> };
>
>
>
> william@beaglebone:~$ sudo touch /etc/modprobe.d/uio.conf
> william@beaglebone:~$ sudo nano /etc/modprobe.d/uio.conf
> # put in /etc/modprobe.d/uio.conf
> #
> # make driver match on compatible = "uio";
> options uio_pdrv_genirq of_id=uio
>
> william@beaglebone:~$ ls /dev | grep uio /* Crickets . . .*/
>
> william@beaglebone:~$ sudo sh -c "echo ' WH-ADC' >
> /sys/devices/platform/bone_capemgr/slots"
> [ 3658.413635] bone_capemgr bone_capemgr: part_number ' WH-ADC', version
> 'N/A'
> [ 3658.420830] bone_capemgr bone_capemgr: slot #5: override
> [ 3658.426181] bone_capemgr bone_capemgr: Using override eeprom data at
> slot 5
> [ 3658.433959] bone_capemgr bone_capemgr: slot #5: 'Override Board
> Name,00A0,Override Manuf, WH-ADC'
>
> *Changing to 4.1.x kernel*
>
> william@beaglebone:~$ sudo nano /boot/uEnv.txt
> uname_r=4.1.18-bone-rt-r19
> william@beaglebone:~$ sudo reboot
>
> william@beaglebone:~$ sudo sh -c "echo 'WH-ADC' >
> /sys/devices/platform/bone_capemgr/slots"
> [ 62.607962] bone_capemgr bone_capemgr: part_number 'WH-ADC', version
> 'N/A'
> [ 62.614993] bone_capemgr bone_capemgr: slot #4: override
> [ 62.620338] bone_capemgr bone_capemgr: Using override eeprom data at
> slot 4
> [ 62.627374] bone_capemgr bone_capemgr: slot #4: 'Override Board
> Name,00A0,Override Manuf,WH-ADC'
> [ 62.649771] bone_capemgr bone_capemgr: slot #4: dtbo
> 'WH-ADC-00A0.dtbo' loaded; overlay id #0
>
> So, something between these two versions, has changed, and has broken what
> worked initially. Perhaps it could even be the adc alias in the main board
> file ? I haven't looked yet . . .
>
>
>
>
>
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