Re: [PATCH v2] driver: platform: Support parsing GpioInt 0 in platform_get_irq()

From: Mika Westerberg
Date: Tue Feb 12 2019 - 04:08:44 EST

On Mon, Feb 11, 2019 at 11:01:12AM -0800, egranata@xxxxxxxxxxxx wrote:
> From: Enrico Granata <egranata@xxxxxxxxxxxx>
> 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 requires drivers to
> either have to support only one possible IRQ resource, or to have code
> in place to try both as a failsafe.
> While there is a possibility of ambiguity for devices that exposes
> multiple IRQs, it is easy and feasible to support the common case
> of devices that only expose one IRQ which would be of either type
> depending on the underlying system's architecture.
> This commit adds support for parsing a GpioInt resource in order
> to fulfill a request for the index 0 IRQ for a platform device.
> Signed-off-by: Enrico Granata <egranata@xxxxxxxxxxxx>

Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>