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

["Enrico Weigelt, metux IT consult" <lkml@metux.net>]

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
features).

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.


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287