Re: [virtio-comment] Re: [PATCH] Reserve device id for GPIO device

[Jie Deng <jie.deng@intel.com>]

On 2021/6/2 19:57, Enrico Weigelt, metux IT consult wrote:
> On 02.06.21 08:42, Viresh Kumar wrote:
> > Use device ID 41
>
> Thanks for submitting that. I should have been my duty, but I've been
> too busy w/ other things.
>
> You've probably already seen my spec in the Linux virtio-gpio patch
> queue. Feel free to texify it for submitting here. (*1)
>
> Also please remind me to update the device id (need to fix kernel as
> well as qemu side).
>
>
> --mtx
>
> *1) 
> https://github.com/metux/linux/commit/66c98eab3433a592b11d60d1a05c2609fee4811a
> https://github.com/metux/linux/tree/submit/virtio-gpio-2020-12-07-v3

Has anyone ever tried to use GPIO in the guest to generate waveform ?

When the frequency reaches a certain level, the waveform will become 
inaccurate
due to the delay and uncertainty of the communication time between 
virtio frontend
and backend. I'm not sure if any good solution for this case.

Regards,
Jie