Using pwm-leds for non-LED related purpose

[Gabriele]

Hi,
In order to adjust the sound pitch a magnetic buzzer I thought using a PWM could be the right choice.
Looking at the nrf5340dk device tree source I've found a pwmleds resource node, which relyes on the "pwm-leds" driver.

/ {
	...
	pwmleds {
		compatible = "pwm-leds";
		pwm_led1: pwm_led_1 {
			pwms = <&pwm1 25>;
		};
	};
};

&pwm1 {
	status = "okay";
	ch0-pin = <25>;
};

In few minutes I managed to control the buzzer sound nicely.
Now, as the name suggests, I suppose the "pwm-leds" was originally conceived to adjust the brightness of a LED, making it to step from dark to max brightness.
Is it appropriate to use it for a buzzer ?

[Jared]

Hi,

It's probably just fine, but as you write the main use case for this driver is to be used with LEDs. The Nordic PWM driver has more properties and thus support more configuration.

regards

Jared 

[Gabriele]

I've stumbled upon this article yesterday, where the author uses the pwm-leds device to drive a speaker.
The only difference is he puts an alias to refer to channel 0 of pwm 0 by name "pwmsound".
I'll stay on this solution for the sake of simplicity.

Thank you