Re: [RFC] qnap-tsx51: add new driver for leds and button support on QNAP TS-x51 series

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Mon, Jun 6, 2016 at 2:44 AM, Vincent Pelletier <plr.vincent@xxxxxxxxx> wrote:

> (please keep me CC'ed in replies, I'm not getting a majordomo
> subscription confirmation mail)

Please put me on To: on patches related to GPIO...

> I see drivers using GPIOs should use descriptors instead of gpio
> number. I fail to see how I should convert this driver to use
> descriptors. Or at least, I like a lot that this module has extremely
> little actual code, as I would expect from something which essentially
> does the same work as ACPI tables. Is it also achievable with
> descriptors ?

Yes, you can have static mappings, it's a bit tricky and only
done in a few places in the kernel. You have to add a static
lookup table using #include <linux/gpio/machine.h>

See:
arch/arm/mach-integrator/impd1.c function impd1_probe()
for an example.

git grep gpiod_add_lookup_table
for other examples.

Yours,
Linus Walleij
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