On Wed, Sep 11, 2024 at 04:57:41PM +0200, Mark Kettenis wrote:
> > This impacts a lot more code than I had originally thought.
> > I wonder if this is a good idea after all...
> Yes, not sure about this one.  The iic(4) bus itself does not support
> hotplugging and USB iic(4) controllers are somewhat of a rare toy I
> guess.

I know of two, the I2C-Tiny-USB project and the CP2112 controller...
I think this is only really useful if a /dev/iic-n is made available to
allow the buses to be used from user space.

There is the beginnings of such an implementation in i2c_io.h
(JI2C_IOCTL_EXEC behind a ‘#ifdef notyet’ ) but this code has been around
since 2004. Is this something desirable (notyet == tobedone) or is
the OpenBSD philosophy to keep access to i2c devices strictly in kernel
space?

-- 
Denis