Hello Pavel, Am Dienstag, 2. April 2019, 13:12:31 CEST schrieb Pavel Machek: > On Tue 2019-04-02 12:23:29, Alexander Dahl wrote: > > on my desk lies a piece of hardware with some dual color LEDs connected to > > some IO ports. The LEDs shine green or red depending on polarity and are […] > Fortunately, that is not too common setup. You still need two output > pins and two LEDs, AFAICT only advantage is that you save one > resistor. Don't do it. Unfortunately, this hardware already exists, I have to deal with it, see above. > That said, driver that takes two GPIOs and exposes one LED with > aditional color attribute should be acceptable. So, do I understand correctly, there's nothing to deal with such a setup in Linux yet, and I need a new driver? Documentation/devicetree/bindings/leds/leds-gpio.txt does not seem to document such a usecase, so I guess the leds-gpio driver does not support it out of the box? What do you mean by "aditional color attribute"? Sorry, I'm not that deep into the LED subsystem yet. Of course I could just handle those as two independent LEDs for now, but that would lead to not desired states, because both colors are not independent! The only thing I could try would be let userspace somehow control the brightness and triggers to avoid both colors cancelling out each other? Greets Alex
