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SubjectRe: [PATCH v6 00/10] Add the I3C subsystem

> * What I understand from reading i2c-demux-pinctrl.c, a slave device
> will only ever be observable from one master at a time, when you
> switch over, all children get removed on one master and added to
> the other one, to be probed again by their respective drivers.

Yes. The very first versions of the demuxer tried to do it in a
hot-swapping like fashion but then I switched over because of...

> it definitely opens up questions in what happens to e.g. the sysfs
> representation, lock order, and power management that I'd rather
> not have to think about.

... this! There are dragons, I can tell you :)

> * The other thing we definitely have to support for i3c is to deal with
> handing over control of the bus between the i3c master owned
> by Linux, and other masters that are /not/ owned by the same
> Linux instance. This is the part that the spec discusses in much
> detail, with the intention of temporarily giving up control of the
> bus to let another master do its thing on a shared slave without
> user interaction.

I can't comment about this one.

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