linux-kernel - Re: [PATCH 1/2] irq/irq_sim: provide irq_sim_fire

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Date:   Wed, 5 Dec 2018 13:38:11 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>
Cc:     u.kleine-koenig@...gutronix.de,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-gpio <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 1/2] irq/irq_sim: provide irq_sim_fire_edge()

śr., 5 gru 2018 o 13:20 Linus Walleij <linus.walleij@...aro.org> napisał(a):
>
> On Mon, Dec 3, 2018 at 12:06 PM Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Mon, Dec 03, 2018 at 11:57:26AM +0100, Bartosz Golaszewski wrote:
>
> > > It used to live in the gpio-mockup driver and I generalized it
> > > precisely because there was another driver - iio evgen - which was
> > > doing basically the same thing. While I don't know if there'll be more
> > > users (I'd guess it would be useful for testing purposes of other
> > > subsystems) having the same functionality implemented once is better
> > > than twice.
> >
> > The iio testing driver only needs the trigger and relies on an irq that
> > then calls the registerd handler. The iio driver doesn't need to tune
> > the edge sensitivity though and if your mockup driver just only calls
> > the fire routine if the configured sensitivity justifies that,
> > everything should work as expected.
>
> Simulating edges in the generic IRQ simulator codes seems
> generally useful to me, even if there is just one user now.
>
> Certainly for any kind of IRQ testing, it could be interesting to
> throw several low-to-high and high-to-low transitions
> on a driver and see how it reacts.
>
> But it is up to the irqchip maintainers to state whether they
> agree.
>

All that would be great, but at this point I just want to fix broken
tests in user-space. After that we can think about how to
improve/approach simulating interrupts all we want.

Marc: is my explanation for using an int instead of bool for
irq_sim_fire_edge() fine? Can Linus pick this up for fixes?

Bart