diff options
author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2015-05-06 13:29:06 +0300 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2015-05-11 11:56:11 +0200 |
commit | c884fbd452147e952ae160e750553d00ea4dc4c9 (patch) | |
tree | 7e2488cb40d3b70ac525fd3ea9ca2b69eda0c3f2 /drivers/gpio/gpio-mxs.c | |
parent | 442b2494b17d1a4f0a14721580271eb23ebffd42 (diff) |
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
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@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-mxs.c')
0 files changed, 0 insertions, 0 deletions