[fedora-arm] Re: Change in kernel PPS GPIO handling?

Hi Chris,

Am 02.03.22 um 10:51 schrieb Peter Robinson:
>> 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.

do you use the DTB file from 5.14.x or 5.16x?

I guess this is related to this commit:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.16.y&id=266423e60ea1b953fcc0cd97f3dad85857e434d1

Unfortunately this is a change which requires this DTS fix:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.16.y&id=c8013355ead68dce152cf426686f8a5f80d88b40

So DTB and kernel must "match".

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