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Subject: Re: [virtio-dev] Re: [virtio-comment] [PATCH v2] virtio-gpio: add formal specification

On 01.07.21 11:01, Arnd Bergmann wrote:

Agreed, interrupt support is obviously something that can not be
retrofitted easily if you don't get it right from the start.

It's basically present, the basic version (as now writting in this spec)
just can't do hardware masking - that part is planned as an optional
feature (which I haven't yet put into that spec version, since I wanted
to get the basic version finished up before doing the optional

Actually, the optional feature will just add another message for
mask/unmask. I'll yet having conversations w/ HW engineers on certain
aspects, e.g. automatic masking (yes/no/configurable ?).

There're also other more sophisticated features like HW debounce,
pinmux, etc, that are to come later - as *optional* features that some
device may or may not support.

Note that this isn't just about moving drivers into some VMM, but also
about actual hardware.


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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
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