On Tue, Mar 1, 2016 at 2:52 PM, Mika Westerberg
<mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> On Mon, Feb 29, 2016 at 04:24:16PM +0000, sergk sergk2mail wrote:
>> But how then to obtain gpio name or if it is possible the list of all
>> available names?
>> For example decoded ACPI DSDT shows the following:
>> how to get gpio name for mentioned in your reply function?
>
> For existing systems that do not provide _DSD naming for GPIOs you still
> can provide them in the driver itself (ugly but works). See
> Documentation/acpi/gpio-properties.txt chapter "ACPI GPIO Mappings
> Provided by Drivers".
I just this merge window added an ABI for userspace to read name
of the GPIO line and also consumer name ("label") by using the
two strings stored in struct gpio_desc.
Currently this will be initialized per-offset from the seldom used
char names[] in struct gpio_chip, if not NULL.
We're working on DT bindings to set this per-line from the DT, and
if ACPI has a mechanism to name individual lines, please submit
patches for assigning this properly! (Hi Mika ;)
For consumers struct gpio_desc is opaque, but if they actually need
to know the name of a line we can add gpiod_get_name(struct gpio_desc *)
but then I want to know a usecase. debugfs and userspace ABI is
already displaying it just fine.
Yours,
Linus Walleij
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