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

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Message-ID: <CACRpkdaTNFFevE-hauMn17cXbsoddkw_Bp3WyBHbzG1+dohxew@mail.gmail.com>
Date:   Fri, 14 Dec 2018 15:07:37 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 1/2] irq/irq_sim: provide irq_sim_fire_edge()

On Wed, Dec 5, 2018 at 2:20 PM Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
> On Wed, Dec 05, 2018 at 01:19:54PM +0100, Linus Walleij wrote:

> > > 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.
>
> I cannot imagine another potential user. Which kind of driver could use
> that that is not a gpio simulator?

I suppose anything that can generate an IRQ and wants to generate
some test IRQs where edge matters, drivers/irqchips/?

Regmap IRQ drivers/base/regmap/regmap-irq.c does support
edges, and regmap already expose all registers it handles in
debugfs, so it'd be really neat of you can also use debugfs
to insert IRQs from a device using regmap.

Yours,
Linus Walleij