Adjust periphery implementation to not set GPIO V2 real-time flag

[theshaun]

After further digging at the core issue with older kernels I discovered that the root cause relates to GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME being set when edge detection is used

https://github.com/vsergeev/python-periphery/blob/master/periphery/gpio_cdev2.py#L261C13-L261C19

GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME seems to have been added into the linux kernel in 5.16 or so. A lot of Rockchip boards still use 5.10.~

Given we do not seem to need timestamps for the interrupts its not necessary to have this flag set. And given that python-periphery is not actively maintained (it seems) it is easier to make the change here for our use case, but i'll update an existing issue upstream to see if there is a way they can implement a fix.

I expect that after some longer testing, we may be able to remove the gpiod implementation I added previously as this will allow luckfox and other rockchip devices to just use python-periphery

[rightup]

Well this is a brilliant find!

[theshaun]

Have had this running on some boards for a while with no dramas. I feel this is save to use, but happy to add a flag to enact this if that seems better

[rightup]

My only thought is.. would it be an issue when we add multiple radios, I started looking at a way to auto detect version but ran out of time. Sent from Outlook for iOS<https://aka.ms/o0ukef>

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________________________________ From: Shaun Walker ***@***.***> Sent: Saturday, March 14, 2026 8:02:01 AM To: rightup/pyMC_core ***@***.***> Cc: Lloyd ***@***.***>; Comment ***@***.***> Subject: Re: [rightup/pyMC_core] Adjust periphery implementation to not set GPIO V2 real-time flag (PR #43) [https://avatars.githubusercontent.com/u/712995?s=20&v=4]theshaun left a comment (rightup/pyMC_core#43)<#43 (comment)> Have had this running on some boards for a while with no dramas. I feel this is save to use, but happy to add a flag to enact this if that seems better — Reply to this email directly, view it on GitHub<#43 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ACM32JOIW7UW2PPYQOO63D34QUGXTAVCNFSM6AAAAACWKFWF5GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DANJZHE3TGNZTHE>. You are receiving this because you commented.Message ID: ***@***.***>

[theshaun]

I don't believe it should. I did consider if we had kernel detection. but given some vendors cherry pick it might be present somewhere in a version we don't think it would be (slim though).

When multi radio is added, is it anticipated to need real time output of GPIO state?