How to use 40pins pwm01？

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
23

Okay, the previous example is for AGX Orin as the PIN13 on 40 pins header is pwm8(32f0000.pwm)

For Orin Nano devkit, please simply refer to the following steps to verify.
PIN15 of 40 pins header on Orin Nano devkit is pwm1(3280000.pwm)

1. configure the device tree for parent clock
                pwm@3280000 {
                        compatible = "nvidia,tegra234-pwm\0nvidia,tegra194-pwm";
                        reg = <0x00 0x3280000 0x00 0x10000>;
                        clocks = <0x03 0x69>;
                        resets = <0x03 0x44>;
                        reset-names = "pwm";
                        status = "okay";
                        #pwm-cells = <0x02>;
                        phandle = <0x228>;
+                       assigned-clock-parents = <0x03 0x0e>;
+                       assigned-clocks = <0x03 0x69>;
                };

2. check if you get the 19.2MHz for the clock of pwm1
# grep -E "pwm1" /sys/kernel/debug/clk/clk_summary
    pwm1                              1        1        0    19200000          0     0  50000         Y

3. check pwm node (if pwmchip0 -> ../../devices/platform/bus@0/3280000.pwm/pwm/pwmchip0)
# ls -l /sys/class/pwm
# cd /sys/class/pwm/pwmchip0
# echo 0 > export
# cd pwm0

4. configure the pwm period/duty_cycle
# echo 10000000 > period
# echo 5000000 > duty_cycle
# echo 1 > enable