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SubjectRe: [PATCH v5 01/10] i3c: Add core I3C infrastructure
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On 2018-06-22 12:49, Boris Brezillon wrote:
> Add core infrastructure to support I3C in Linux and document it.
>
> This infrastructure is not complete yet and will be extended over
> time.
>
> There are a few design choices that are worth mentioning because they
> impact the way I3C device drivers can interact with their devices:
>
> - all functions used to send I3C/I2C frames must be called in
> non-atomic context. Mainly done this way to ease implementation, but
> this is still open to discussion. Please let me know if you think
> it's worth considering an asynchronous model here
> - the bus element is a separate object and is not implicitly described
> by the master (as done in I2C). The reason is that I want to be able
> to handle multiple master connected to the same bus and visible to
> Linux.
> In this situation, we should only have one instance of the device and
> not one per master, and sharing the bus object would be part of the
> solution to gracefully handle this case.
> I'm not sure we will ever need to deal with multiple masters
> controlling the same bus and exposed under Linux, but separating the
> bus and master concept is pretty easy, hence the decision to do it
> like that.
> The other benefit of separating the bus and master concepts is that
> master devices appear under the bus directory in sysfs.

Are bus multiplexers relevant to I3C? The locking needed for handling
muxes for I2C is, well, convoluted...

Cheers,
Peter

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