Reading temperature and transmitting value to PWM

VIM3 Android
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Android VIM3L

Which version of system do you use? Please provide the version of the system here:

Pie9-64

please help me with the task.
I need to read the temperature of the SoC once a minute and, depending on it, generate a PWM on the GPIO35.
This is the only way to transfer it to a third-party application… I don’t understand how to do this.

2

Please, @A.M.T @xiong.zhang @jasonl help me.
I found how read temp. But I don’t understand how use PWM.
I found it for VIM3:

you can add dts cfg ,modify arch/arm/boot/dts/amlogic/kvim3.dts

 &pwm_ef {
                status = "okay";
+               pinctrl-names = "default";
+                pinctrl-0 = <&pwm_f_pins2>;
        };

then input command as follow
echo 1 > /sys/class/pwm/pwmchip4/export
echo 1000000 > /sys/class/pwm/pwmchip4/pwm1/period
echo 500000 > /sys/class/pwm/pwmchip4/pwm1/duty_cycle
echo 1 > /sys/class/pwm/pwmchip4/pwm1/enable
you will see the pwm input by oscilloscope

BUT… I don’t see “arch/arm/boot/dts/amlogic/kvim3.dts”, also I don’t see “pwm1”

kvim3l:/sys/class/pwm/pwmchip4 # ls -la
total 0
drwxr-xr-x 3 root root    0 2024-11-30 12:26 .
drwxr-xr-x 3 root root    0 2024-11-30 12:26 ..
lrwxrwxrwx 1 root root    0 2024-11-30 12:57 device -> ../../../ff802000.pwm
--w------- 1 root root 4096 2024-11-30 12:56 export
-r--r--r-- 1 root root 4096 2024-11-30 12:57 npwm
drwxr-xr-x 2 root root    0 2024-11-30 12:57 power
lrwxrwxrwx 1 root root    0 2024-11-30 12:57 subsystem -> ../../../../../../../class/pwm
-rw-r--r-- 1 root root 4096 2024-11-30 12:57 uevent
--w------- 1 root root 4096 2024-11-30 12:57 unexport
kvim3l:/sys/class/pwm/pwmchip4 #

kvim3l:/ # find / -type f -name "*.dts" -> 0 results

HOW it work for VIM3L?!!!