> I have an RPi4 running Fedora 35. It hadn't been updated in a while, so > I applied updates today. When I boot to the kernel 5.16.11-200, I lose > the PPS device from my GPS hat. Boot back to 5.14.16-301.fc35 and it > works. > > I'm booting with EFI firmware, and with a device tree config.txt that All our firmware are EFI, that's the only way we support booting, is it the default U-Boot based one or are you using the edk2 one? > has "dtoverlay=pps-gpio,gpiopin=4" in it. I removed the /boot/dtb > symlink and set /etc/u-boot.conf to not re-add it. > > When I boot 5.16, I see /proc/device-tree, and it has > /proc/device-tree/pps@4 in it (and the contents look correct), but > loading the pps-gpio kernel module just gives: > > pps-gpio: probe of pps@4 failed with error -22 Any chance you can tell us which kernel it started with, 5.14.x to 5.16.x is a big window to debug and looking at kernel logs for drivers/pps there's been no changes in that space in the 5.15+ kernels at all. I wonder if it's a change/regression in the firmware overlay <-> kernel interface. _______________________________________________ arm mailing list -- arm@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to arm-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/arm@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
