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

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Message-ID: <20181205132000.f7n2stv2pxldzcxu@pengutronix.de>
Date:   Wed, 5 Dec 2018 14:20:00 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Linus Walleij <linus.walleij@...aro.org>
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 05, 2018 at 01:19:54PM +0100, Linus Walleij wrote:
> 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.

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

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |