Hi Sven,
On 1/20/22 3:07 PM, Sven Schwermer wrote:
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";Hi Sven,
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.
leds-pwm driver doesn't have support for multicolor LEDs. You'd have to
write a new driver, say leds-pwm-multicolor.
--
Best regards,
Jacek Anaszewski
