Device Tree Overlay for PPS Support on JP4.6.4

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
,
9

Please share your device tree before any modification for the devkit.

and refer to the following steps to apply the overlay dtbo for pps:

Step 1. create overlay dts (my-overlay.dts)
$ vim my-overlay.dts

/dts-v1/;
/plugin/;
 
/ {
    overlay-name = "My PPS Overlay";
    jetson-header-name = "Jetson 40pin Header";
    compatible = "nvidia,p3449-0000-b00+p3448-0000-b00";
 
    fragment@0 {
		target-path = "/";
		__overlay__ {
			pps_gpio {
				compatible = "pps-gpio";
				gpios = <0x5b 0xd8 0x0>;
				assert-falling-edge;
				status = "okay";
			};
		};
	};
};

Step 2. create overlay dtbo (my-overlay.dtbo)

$ dtc -O dtb -o my-overlay.dtbo -@ my-overlay.dts

Step 3. apply overlay dtbo through jetson-io tool

$ sudo cp my-overlay.dtbo /boot
$ sudo /opt/nvidia/jetson-io/config-by-hardware.py -l
$ sudo /opt/nvidia/jetson-io/config-by-hardware.py -n "My PPS Overlay"
$ sudo reboot
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