RaspberryPi 5 DeviceTree Overlays for 4 channel PWM0 (choose one of the two available GPIO pin mappings for PWM)

pwm-4chan-alt-pi5.dts

// SPDX-License-Identifier: GPL-2.0-only
// This file is released under the GPL v2.0 License, and comes without warranty, express or implied.
// (C) Andrey Upadyshev, 2026

/*

This overlay activates four PWM0 channels of RaspberryPi 5 on the following GPIO pins:
GPIO 12: PWM0_CHAN0 (Alt0)
GPIO 13: PWM0_CHAN1 (Alt0)
GPIO 18: PWM0_CHAN2 (Alt3)
GPIO 19: PWM0_CHAN3 (Alt3)

Alternatively use:
- `pwm-4chan-pi5` overlay to activate 4 PWM0 channels on pins 12, 13, 14 and 15
- `pwm-2chan` and `pwm` overlays to activate 2 and 1 PWM channels accordingly

 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2712";

	fragment@0 {
		target = <&gpio>;
		__overlay__ {
			pwm_pins: pwm_pins {
				function = "pwm0";
				pins = "gpio12", "gpio13", "gpio18", "gpio19";
			};
		};
	};

	fragment@1 {
		target = <&rp1_pwm0>;
		frag1: __overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&pwm_pins>;
			status = "okay";
		};
	};
};

pwm-4chan-pi5.dts

// SPDX-License-Identifier: GPL-2.0-only
// This file is released under the GPL v2.0 License, and comes without warranty, express or implied.
// (C) Andrey Upadyshev, 2026

/*

This overlay activates four PWM0 channels of RaspberryPi 5 on the following GPIO pins:
GPIO 12: PWM0_CHAN0 (Alt0)
GPIO 13: PWM0_CHAN1 (Alt0)
GPIO 14: PWM0_CHAN2 (Alt0)
GPIO 15: PWM0_CHAN3 (Alt0)

Alternatively use:
- `pwm-4chan-alt-pi5` overlay to activate 4 PWM0 channels on pins 12, 13, 18 and 19
- `pwm-2chan` and `pwm` overlays to activate 2 and 1 PWM channels accordingly

 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2712";

	fragment@0 {
		target = <&gpio>;
		__overlay__ {
			pwm_pins: pwm_pins {
				function = "pwm0";
				pins = "gpio12", "gpio13", "gpio14", "gpio15";
			};
		};
	};

	fragment@1 {
		target = <&rp1_pwm0>;
		frag1: __overlay__ {
			pinctrl-names = "default";
			pinctrl-0 = <&pwm_pins>;
			status = "okay";
		};
	};
};

Before using, compile the above overlay source files and copy the result DTBOs to the overlays directory (/boot/overlays by default):

dtc -@ -I dts -O dtb -o pwm-4chan-pi5.dtbo pwm-4chan-pi5.dts && \
dtc -@ -I dts -O dtb -o pwm-4chan-alt-pi5.dtbo pwm-4chan-alt-pi5.dts && \
sudo cp pwm-4chan-pi5.dtbo pwm-4chan-alt-pi5.dtbo /boot/overlays/

Enable either by adding dtoverlay=pwm-4chan-pi5 line to /boot/firmware/config.txt (preferably under [pi5] section) or dynamic via sudo dtoverlay pwm-4chan-pi5 command.

Note that you cannot remove PWM overlays dynamically via dtoverlay -r. The removal causes a kernel segfault which requires a reboot to fix the system. This may be fixed in newer version of the kernel/PWM driver

Note that only one PWM overlay can be activated at the same time time