BACKPORT: gpio / ACPI: Add support for retrieving GpioInt resources from a device

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

    Name (_CRS, ResourceTemplate ()
        I2cSerialBus (0x004A, ControllerInitiated, 0x00061A80,
                      AddressingMode7Bit, "\\_SB.PCI0.I2C6",
                      0x00, ResourceConsumer)
        GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
                IoRestrictionOutputOnly, "\\_SB.GPO0",
                0x00, ResourceConsumer)
        GpioInt (Level, ActiveLow, Shared, PullDefault, 0x0000,
                 "\\_SB.GPO0", 0x00, ResourceConsumer)

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.

Change-Id: Iea462c47e1328c49a7abe6bb9c24cccd1c1ed0e7
Signed-off-by: Mika Westerberg <>
Acked-by: Rafael J. Wysocki <>
Signed-off-by: Linus Walleij <>
Signed-off-by: Bogdan Davidoaia <>
Signed-off-by: Robert Dolca <>
2 files changed