Re: [PATCH v2 1/3] gpio / ACPI: Add support for retrieving GpioInt resources from a device

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Wed, May 6, 2015 at 12:29 PM, Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:

> ACPI specification knows two types of GPIOs: GpioIo and GpioInt. The latter
> is used to describe that a given device interrupt line is connected to a
> specific GPIO pin. Typical ACPI _CRS entry for such device looks like
> below:
>
>     Name (_CRS, ResourceTemplate ()
>     {
>         I2cSerialBus (0x004A, ControllerInitiated, 0x00061A80,
>                       AddressingMode7Bit, "\\_SB.PCI0.I2C6",
>                       0x00, ResourceConsumer)
>         GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
>                 IoRestrictionOutputOnly, "\\_SB.GPO0",
>                 0x00, ResourceConsumer)
>         {
>             0x004B
>         }
>         GpioInt (Level, ActiveLow, Shared, PullDefault, 0x0000,
>                  "\\_SB.GPO0", 0x00, ResourceConsumer)
>         {
>             0x004C
>         }
>     })
>
> Currently drivers need to request a GPIO corresponding to the right GpioInt
> and then translate that to Linux IRQ number. This adds unnecessary lines of
> boiler-plate code.
>
> We can ease this a bit by introducing acpi_dev_gpio_irq_get() analogous to
> of_irq_get(). This function translates given GpioInt resource under the
> device in question to the suitable Linux IRQ number.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

Patch applied.

Yours,
Linus Walleij
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