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

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Message-ID: <CAJZ5v0jFqkTS__oOfPNvatHOa6OA++uRNLx1-PhiPvS1VnPVXg@mail.gmail.com>
Date:   Thu, 7 Feb 2019 20:02:18 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     egranata@...gle.com
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        gwendal@...omium.org, Dmitry Torokhov <dtor@...omium.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Brian Norris <briannorris@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        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()

+Mika Westerberg
+Andy Shevchenko
+Hans de Goede

On Thu, Feb 7, 2019 at 7:59 PM <egranata@...gle.com> wrote:
>
> From: Enrico Granata <egranata@...omium.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.
>
> This commit adds that functionality.
>
> Signed-off-by: Enrico Granata <egranata@...omium.org>
> ---
>  drivers/base/platform.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 1c958eb33ef4d..c50c4f9033aef 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -127,7 +127,17 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
>                 irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
>         }
>
> -       return r ? r->start : -ENXIO;
> +       if (r)
> +               return r->start;
> +
> +       /*
> +        * If no IRQ was found, try to parse ACPI GpioInt resources
> +        * as a last resort.
> +        */
> +       if (has_acpi_companion(&dev->dev))
> +               return acpi_dev_gpio_irq_get(ACPI_COMPANION(&dev->dev), num);
> +
> +       return -ENXIO;
>  #endif
>  }
>  EXPORT_SYMBOL_GPL(platform_get_irq);
> --
> 2.20.1.611.gfbb209baf1-goog
>