linux-kernel - Re: [PATCH] driver: platform: Add support for GpioInt() ACPI to platform_get

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Message-ID: <20190211103024.GY7875@lahna.fi.intel.com>
Date:   Mon, 11 Feb 2019 12:30:24 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Dmitry Torokhov <dtor@...omium.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Enrico Granata <egranata@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Brian Norris <briannorris@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH] driver: platform: Add support for GpioInt() ACPI to
 platform_get_irq()

Hi,

On Thu, Feb 07, 2019 at 12:29:17PM -0800, Dmitry Torokhov wrote:
> >
> > > Do you have a suggestion as to how to write ACPI tables to avoid the issue?
> >
> > 1. Allocate new ID and use it (perhaps not the best path).
> > 2. Use GPE(s).
> >
> 
> Or just solve the issue of intermixing Interrupt() with GpioInt(). We
> have similar issue with i2c and spi, but we sidestep that there as we
> only parse the first interrupt and do not give option of fetching 2nd,
> 3rd, etc. Maybe we should only GpioInt parsing for the first interrupt
> in platform_get_irq() as well for the first iteration and then see if
> we need to improve it if we see devices with multiple interrupts.

I think it should be fine to intermix them or do what you suggest and
start supporting index 0 for now and then maybe extend it in the future
to cover more.