topic Re: USB detection on i.MX8MM in i.MX Processors

USB detection on i.MX8MM

dpog — Thu, 12 Jan 2023 08:37:44 GMT

I'm having problems configuring the USB-Port, assumingly the problem lies within the device tree. The USB is used as a host, but when I state dr_mode="host", the Port is only powered for a short time in the kernel boot, when I set it to "peripheral" or "otg", the power stays on.

In all cases I'm unable to see the device (USB Mass Storage) from the userspace with lsblk. Any suggestions?

reg_usb_b_vbus: regulator-usbotg2 {

compatible = "regulator-fixed";

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_reg_usb_b_vbus>;

regulator-name = "USB_B_VBUS";

regulator-min-microvolt = <5000000>;

regulator-max-microvolt = <5000000>;

gpio = <&gpio1 14 GPIO_ACTIVE_HIGH>;

enable-active-high;

};

&usbotg2 { /* USB B - Type A */

dr_mode = "host";

vbus-supply = <&reg_usb_b_vbus>;

over-current-active-high;

status = "okay";

};

pinctrl_reg_usb_b_vbus: reg_usbb_vbus {

fsl,pins = <

MX8MM_IOMUXC_GPIO1_IO14_USB2_OTG_PWR 0x41

};

Re: USB detection on i.MX8MM

Rita_Wang — Fri, 13 Jan 2023 05:31:39 GMT

How is your USB2 design, used as host ( Type A )? Can the usb2 can work well on the host?

Re: USB detection on i.MX8MM

dpog — Fri, 13 Jan 2023 13:57:31 GMT

I'm not sure if I understand your question correctly. The Datalines are connected to the iMX8MM without a Phy, the OC and PWR_EN go to a AP22615AWU-7 for current protection.

Re: USB detection on i.MX8MM

Rita_Wang — Mon, 16 Jan 2023 09:58:51 GMT

Can you share the section schematic to us?

Re: USB detection on i.MX8MM

dpog — Mon, 16 Jan 2023 10:10:26 GMT

Of course, to clarify: the iMX8 is part of a SoM, the USB-Connector resides on the BaseBoard, so USB-2 corresponds to USB-B

Re: USB detection on i.MX8MM

dpog — Wed, 18 Jan 2023 13:46:29 GMT

The problem was resolved by moving the pinctrl section to the usbotg node and configuring the regulator-gpio as a gpio in the pin config