linux-kernel - Re: [PATCH 2/2] gpio: sch: Add interrupt support

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Date:   Wed, 24 Apr 2019 11:18:02 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 2/2] gpio: sch: Add interrupt support

On Wed, Apr 24, 2019 at 10:12:42AM +0200, Jan Kiszka wrote:
> On 24.04.19 09:58, Mika Westerberg wrote:
> > +Rafael and linux-acpi.
> > 
> > On Thu, Apr 18, 2019 at 11:23:49AM +0200, Jan Kiszka wrote:
> > > From: Jan Kiszka <jan.kiszka@...mens.com>
> > > 
> > > Validated on the Quark platform, this adds interrupt support on rising
> > > and/or falling edges.
> > 
> > The irqchip parts look good to me but but the ACPI SCI handling seems
> > weird. This is typically handled by ACPI core based on the values read
> > from FADT ACPI table. What does it contain on this Quark platform?
> 
> There is no FADT on the original Quark firmware, nor did we add one. As we
> are talking about existing devices, possibly not only Quarks, I was going
> down the ACPI-independent way to hook into the interrupt. But I'm open to
> learn about better alternatives.

Hmm, if it does not have FADT table why would you need SCI then? Is this
implementing some real use case?