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Subject: Re: [PATCH v5 10/12] gpio: Support for unified device properties interface
From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 17 Oct 2014 20:09:51 +0200
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Grant Likely <grant.likely@linaro.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        Aaron Lu <aaron.lu@intel.com>, devicetree@vger.kernel.org,
        Linus Walleij <linus.walleij@linaro.org>,
        Alexandre Courbot <gnurou@gmail.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Bryan Wu <cooloney@gmail.com>, Darren Hart <dvhart@linux.intel.com>,
        Mark Rutland <mark.rutland@arm.com>
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On October 17, 2014 2:16:00 PM CEST, "Rafael J. Wysocki" <rjw@rjwysocki.net> wrote:
>From: Mika Westerberg <mika.westerberg@linux.intel.com>
>
>Some drivers need to deal with only firmware representation of its
>GPIOs. An example would be a GPIO button array driver where each button
>is described as a separate firmware node in device tree. Typically
>these
>child nodes do not have physical representation in the Linux device
>model.
>
>In order to help device drivers to handle such firmware child nodes we
>add dev[m]_get_named_gpiod_from_child() that takes a child firmware
>node pointer as its second argument (the first one is the parent device
>itself), finds the GPIO using whatever is the underlying firmware
>method, and requests the GPIO properly.

Could we also have a wrapper around this function without a "name" argument, using just the index?

       Arnd