Re: [PATCH] driver: platform: Add support for GpioInt() ACPI to platform_get_irq()

Rafael J. Wysocki
2019-02-07T19:02:32Z

+Mika Westerberg
+Andy Shevchenko
+Hans de Goede

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.
>
> This commit adds that functionality.
>
> Signed-off-by: Enrico Granata <egranata@chromium.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
>