Am Mon, 12 Apr 2021 19:59:05 +0300 schrieb Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>: > On Mon, Apr 12, 2021 at 06:40:01PM +0200, Henning Schild wrote: > > Tan or Andy, > > > > maybe you can point me to a user of that patch. I guess there might > > be an out-of-tree driver or userland code on how to use the GPIOs > > from there. > > I'm confused. User of this patch is pinctrl-broxton driver. > It's in upstream. Should this appear in /sys/class/gpio as chip so that pins can be exported? That is what i tried and failed with. > Using GPIOs from it is something as done in a few drivers already > (Assuming we have no resources described in the ACPI). I.e. you need > to register in board file the GPIO mapping table with help of > devm_acpi_dev_add_driver_gpios() and use one of gpiod_get() family of > functions to request it. > > In case of LEDs you simple describe GPIO device name in lookup table > and that's it. The drivers/platform/x86/pcengines-apuv2.c not the > best but will give you an idea how to use "leds-gpio" driver in board > files. I am aware of that driver and had a look at it. In order to figure out the arguments for the macros/functions i was hoping for userland gpio "export", but maybe that does not work here ... For now i will assume that it does not show up in sysfs and can maybe still be used, and try to build on top. regards, Henning > > > Feel free to send directly to me in case it is not published > > anywhere and should not yet be on the list, i could just use it for > > inspiration. A driver will likely be GPL anyways. >
