Re: [PATCH V6 1/2] virtio-gpio: Add the device specification

[Viresh Kumar <viresh.kumar@linaro.org>]

On 26-07-21, 13:30, Geert Uytterhoeven wrote:
> Hi Viresh,
> 
> On Mon, Jul 26, 2021 at 12:16 PM Viresh Kumar <viresh.kumar@linaro.org> wrote:
> > On 26-07-21, 11:18, Arnd Bergmann wrote:
> > > Here I have the opposite question: what is the benefit of allowing the requests
> > > to be processed out of order? Should these not all be instantaneous, and easier
> > > to handle by making the request queue serialized?
> >
> > Lets say the guest sends two requests, almost at the same time to
> > the host and they are queued on the vq in this order only:
> >
> > - set direction-out-with-value-1 for line 5.
> > - set direction-in for line 11.
> >
> > Now, if the host is able to process them in parallel, then the second
> > request for line 11 may finish before the requests for line 5 (as it
> > has lesser amount of work to do).
> 
> Speaking about parallel processing, have you already envisioned
> support for .[sg]et_multiple()?

Not yet, but we can surely do that once someone needs it. Same goes
for lots of other gpio pinwise operations.

-- 
viresh