Hello Sven,
On Thu, Jan 20, 2022 at 03:07:26PM +0100, Sven Schwermer wrote:
> I'm wondering about the correct device tree syntax for organizing multiple
> PWM LEDs into a multi-color (RGB) LED. This is my device tree:
>
> / {
> rgb-led {
> pinctrl-names = "default";
> pinctrl-0 = <&pinctrl_leds>;
> compatible = "pwm-leds";
> multi-led@0 {
> color = <LED_COLOR_ID_RGB>;
> led-red {
> pwms = <&pwm1 0 1000000>;
> color = <LED_COLOR_ID_RED>;
> max-brightness = <65535>;
> };
> led-green {
> pwms = <&pwm2 0 1000000>;
> color = <LED_COLOR_ID_GREEN>;
> max-brightness = <65535>;
> };
> led-blue {
> pwms = <&pwm3 0 1000000>;
> color = <LED_COLOR_ID_BLUE>;
> max-brightness = <65535>;
> };
> };
> };
> /* ... */
> };
>
> My kernel complains as follows:
>
> of_pwm_get(): can't parse "pwms" property
> leds_pwm rgb-led: unable to request PWM for multi-led: -2
> leds_pwm: probe of rgb-led failed with error -2
>
> Is my syntax incorrect or is this not a use case that is currently
> supported? I should also note that I back-ported the multi-LED feature to
> 5.4.158 so I may have missed some relevant patches.
AFAIK nodody implemented multicolor functionality for the LEDs PWM
driver yet. I think it should go to drivers/leds/leds-pwm.c and I
would offer to test it, once anybody sends patches for this. O:-)
Greets
Alex
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