Re: [PATCH v2 1/2] gpio / ACPI: Add knowledge about pin controllers to acpi_get_gpiod()

Linus Walleij
2014-11-04T10:18:12Z

On Mon, Nov 3, 2014 at 12:01 PM, Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:

> The GPIO resources (GpioIo/GpioInt) used in ACPI contain a GPIO number
> which is relative to the hardware GPIO controller. Typically this number
> can be translated directly to Linux GPIO number because the mapping is
> pretty much 1:1.
>
> However, when the GPIO driver is using pins exported by a pin controller
> driver via set of GPIO ranges, the mapping might not be 1:1 anymore and
> direct translation does not work.
>
> In such cases we need to translate the ACPI GPIO number to be suitable for
> the GPIO controller driver in question by checking all the pin controller
> GPIO ranges under the given device and using those to get the proper GPIO
> number.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Sweet, patch applied.

Yours,
Linus Walleij