If I just tap the power button on the BBBW, it immediately begins the
shutdown sequence. We need to avoid that behavior; it seems the way to do
so is to disable the PB-state change IRQ (from the TPS65217 datasheet):
8.6.4 Interrupt Register (INT) (Address = 0x02) [reset = 0x80]
Bit 6: PBM R/W 0b = Interrupt is issued when PB status changes.
Bit 6: PBM R/W 1b = No interrupt is issued when PB status changes.
The bit is cleared:
`i2cget -f -y 0 0x24 0x2`
` 0x20`
A similar post from 2017 didn't really seem to have a resolution:
"Disabling PowerOff and Reset button"
https://groups.google.com/g/beagleboard/c/4qv0osguaDI/m/0ITntryPAQAJ
I've followed a similar path, outlined in more detail below, without being
able to disable the PB IRQ, either.
Thanks for any assistance.
The hardware is a BBBW with a 4D Systems gen4 cape and LCD.
`$ uname -a`
`Linux beaglebone 4.19.94-ti-r43 #1buster SMP PREEMPT Wed Apr 22
06:11:16 UTC 2020 armv7l GNU/Linux`
The image is
from
https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Debian_Buster_LXQt_Snapshot
, as it works with the LCD out-of-the-box.
- start with RCN's DT repo:
- `git clone https://github.com/beagleboard/BeagleBoard-DeviceTrees`
- `pushd ~/BeagleBoard-DeviceTrees`
- `fgrep -rni . -e 'tps65217-pwrbutton'`
`./src/arm/tps65217.dtsi:27: compatible =
"ti,tps65217-pwrbutton";`
- `nano ./src/arm/tps65217.dtsi`
comment out the `pwrbutton` node
```
/*
pwrbutton {
compatible = "ti,tps65217-pwrbutton";
interrupts = <2>;
status = "disabled";
};
*/
```
- Note that it doesn't matter if the above file is modified, or the one
below, or both. In no case is the PB IRQ disabled.
- edit the common BB file, `am335x-bone-common.dtsi`, to disable the
`pwrbutton`
- `pushd ~/BeagleBoard-DeviceTrees`
- `nano -l ./src/arm/am335x-bone-common.dtsi`
- the line to edit is ~365
- change status from `okay` to `disabled`:
```
pwrbutton {
status = "disabled";
};
```
- build the dtb files: `make`
- back up the current dtb file, then copy the new dtb file
```
debian@beaglebone:~/BeagleBoard-DeviceTrees$ sudo mv
/boot/dtbs/4.19.94-ti-r43/am335x-boneblack-wireless.dtb
/boot/dtbs/4.19.94-ti-r43/am335x-boneblack-wireless.bak.dtb
debian@beaglebone:~/BeagleBoard-DeviceTrees$ sudo cp
./src/arm/am335x-boneblack-wireless.dtb
/boot/dtbs/4.19.94-ti-r43/am335x-boneblack-wireless.dtb
```
- Compare the resulting dtb file with the original:
- the entire `pwrbutton` section commented out in `tps65217.dtsi`
- `pwrbutton` set to `disabled` in `am335x-bone-common.dtsi`
```
$ dtdiff /boot/dtbs/4.19.94-ti-r43/am335x-boneblack-wireless.bak.dtb
/boot/dtbs/4.19.94-ti-r43/am335x-boneblack-wireless.dtb
--- /dev/fd/63 2020-10-28 02:56:38.720410323 +0000
+++ /dev/fd/62 2020-10-28 02:56:38.720410323 +0000
@@ -280,7 +280,7 @@
chosen {
base_dtb = "am335x-boneblack-wireless.dts";
- base_dtb_timestamp = "Wed Apr 22 06:09:34 2020";
+ base_dtb_timestamp = "Tue Oct 27 19:48:20 2020";
stdout-path = "/ocp/serial@44e09000";
};
@@ -851,9 +851,7 @@
};
pwrbutton {
- compatible =
"ti,tps65217-pwrbutton";
- interrupts = < 0x02 >;
- status = "okay";
+ status = "disabled";
};
regulators {
```
- check IRQ's:
$ cat /proc/interrupts | grep 65217
```
142: 0 INTC 7 Level tps65217-irq
144: 0 tps65217 0 Edge vbus
145: 0 tps65217 2 Edge tps65217_pwr_but
```
--
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