Hello,
I try to make a simple PWM work on PD15 with TIM4_PWM4, wich normally output the PWM on D6, the 6th pin of CN14. I followed example of https://wiki.st.com/stm32mpu/wiki/PWM_overview as I only need two PWM controlled with sysfs (the first beeing PE9 like in the example).
For a reason I don't understand doing the same with TIM4CH4 don't work. Do someone have any idea what is laking in my configuration of TIM4CH4 ?
Here is my device tree :
stm32mp157c-dk2.dts
/* PWM DT provider on TIM1: "pwm1" */
&timers1 {
status = "okay";
/* spare all DMA channels since they are not needed for PWM output */
/delete-property/dmas;
/delete-property/dma-names;
/* define pwm1 label */
pwm1: pwm {
/* configure PWM pins on TIM1_CH1 */
pinctrl-0 = <&pwm1_pins_a>;
pinctrl-1 = <&pwm1_sleep_pins_a>;
pinctrl-names = "default", "sleep";
/* enable PWM on TIM1 */
status = "okay";
};
};
&timers4 {
status = "okay";
pwm4: pwm {
pinctrl-0 = <&pwm4_pins_a>;
pinctrl-1 = <&pwm4_sleep_pins_a>;
pinctrl-names = "default", "sleep";
status = "okay";
};
};
I also tried changing stm32mp15-pinctrl.dtsi but that didn't gave any result so I rolled back.
Did I forgot something ? Did I configured something on PE9 that I forgot to do with PD15 ?
I control PE9 with that kind of commands :
cd /sys/class/pwm
ls
cd pwmchip0/
echo 0 > export
cd pwm0/
echo 20000000 > period
echo 1500000 > duty_cycle
echo 1 > enable
A pwmchip4 appears but I don't obtain any signal in output when I configure things in it.
Thank you for any advice.
