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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Thu, 7 Feb 2019 21:39:25 +0200
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Subject: Re: [PATCH] driver: platform: Add support for GpioInt() ACPI to platform_get_irq()
To:     "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     egranata@google.com,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Gwendal Grignou <gwendal@chromium.org>,
        Dmitry Torokhov <dtor@chromium.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        Brian Norris <briannorris@chromium.org>,
        Enrico Granata <egranata@chromium.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Hans de Goede <hdegoede@redhat.com>
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On Thu, Feb 7, 2019 at 9:04 PM Rafael J. Wysocki <rafael@kernel.org> wrote:
>
> +Mika Westerberg
> +Andy Shevchenko
> +Hans de Goede

Thanks, Rafael.
My comments below.

> On Thu, Feb 7, 2019 at 7:59 PM <egranata@google.com> wrote:
> >
> > From: Enrico Granata <egranata@chromium.org>
> >
> > ACPI 5 added support for GpioInt resources as a way to provide
> > information about interrupts mediated via a GPIO controller.
> >
> > Several device buses (e.g. SPI, I2C) have support for retrieving
> > an IRQ specified via this type of resource, and providing it
> > directly to the driver as an IRQ number.

> > This is not currently done for the platform drivers, as platform_get_irq()
> > does not try to parse GpioInt() resources.

And why is this a problem?

> > This commit adds that functionality.

How that can override the configuration / BIOS flavour when driver
needs to register an interrupt out of GpioIo() resource?

P.S. Have you looked at drivers/platform/x86/i2c-multi-instantiate.c
and intel_cht_int33fe.c?
They are the only drivers which needs something like this for now and
I would rather say it's a bad BIOS decision to write a table like
that.

-- 
With Best Regards,
Andy Shevchenko