Combining multiple PWM LEDs into RGB LED?

[Sven Schwermer <sven@xxxxxxxxxxxxxxxx>]

Hi,

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.

Any insight is appreciated.

Best regards,
Sven