stm32mp135 PA10 as tim1 ch3 pwm

[MWoło.2]

Hi,

I have a problem with the configuration of PA10 of stm32mp135 to work as pwm of TIM1_CH3. I also make an experiment to disable completely timer and PWM and I also can't control this pin using gpioset. In the documentation I saw that this pin is dedicated to USB "...OTG_HS_ID is on PA10 (EXTI10)". My question is simple how to disconnect PA10 from USB completely? CubeMx doesn't do that.

[MWoło.2]

I forgot to add that I try to do this on my custom board which has no physical connection with any USB lines.

[MWoło.2]

The voltage on this PA10 pin is 3.17V, and my VDD is 3.3V.

Command

gpioset gpiochip0 '10'=0

don't change this value

this one

gpioset gpiochip0 '10'=1

also. This pin has to be somewhere configured to USB or another function.

In the system I have

[PatrickF]

Hi @MWoło.2 ,

Maybe have a look to "u-boot,force-b-session-valid" property in order to disable usage of ID pin.

https://wiki.st.com/stm32mpu/wiki/How_to_configure_U-Boot_for_your_board#USB_OTG_node

Regards.

[MWoło.2]

My usbotg_hs section has no 'u-boot,force-vbus-detection;'. I check it and give feedback. Thanks, BR Michal

[MWoło.2]

Hi Patrick,

Unfortunately, additional record in the U-Boot DTS does not help. I discover something new. The 3.17V voltage on PA10 appears not in the U-Boot but after kernel start. So in my opinion the problem is not in the U-Boot but in the Kernel.

Records like 'force-vbus-detection' do not exist in any Kernel files.

How should look the Kernel DTS related to &usbotg_hs to disable the OTG_HS_ID function of PA10?

BR

Michal

[MWoło.2]

I made a teenth of experiments with different parameters in the Kernel dts. The backlight PWM on PA10 works only in the configuration where the added parameter 'usb-role-switch'. Unfortunately in such a configuration gadget ethernet not working. I think it is impossible to set 'peripheral' without involving PA10.

So currently my kernel dts looks

&usbotg_hs{
	status = "okay";

	/* USER CODE BEGIN usbotg_hs */
	dr_mode = "usb-role-switch";
	usb-role-switch;
	phys = <&usbphyc_port1 0>;
	phy-names = "usb2-phy";
	/* USER CODE END usbotg_hs */
};

 I discover also that changing 'dr_mode = ...' to anything does nothing.

Finally, my question is, does it possible to set 'peripheral' and get PWM on PA10?

[MWoło.2 · Accepted solution]

I find a bit similar problem to my

https://community.st.com/t5/stm32-mpu-products/120-369992-dwc2-49000000-usb-otg-overcurrent-change-detected/td-p/168914

and finally, I created something like

&usbotg_hs{
	status = "okay";

	/* USER CODE BEGIN usbotg_hs */
	dr_mode = "peripheral";
	usb-role-switch;
	role-switch-default-mode = "peripheral"; 
	phys = <&usbphyc_port1 0>;
	phy-names = "usb2-phy";
	/* USER CODE END usbotg_hs */
};

 Now my gadget ethernet is working and backlight pwm also. Topic can be closed.