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SubjectRe: [PATCH v10 0/9] Add the I3C subsystem
Hi Boris,

> What we could do though, is expose I3C devices that do not have a
> driver in kernel space, like spidev does.

...

> Mark, Wolfram, Arnd, Greg, any opinion?

Is there a benefit for having drivers in userspace? My gut feeling is to
encourage people to write kernel drivers. If this is, for some reason,
not possible for some driver, then we have a use case at hand to test
the then-to-be-developed userspace interface against. Until then, I
personally wouldn't waste effort on designing it without a user in
sight.

Dunno if you have that, but a debug interface (exchanging data with
clients) on the other hand would be super useful most probably. Maybe
you can start having that in debugfs and already learn from it if you
ever want to move some interface outside of debugfs?

Kind regards,

Wolfram

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