topic Re: IMX 8m Plus do not support USB OTG in i.MX Processors

IMX 8m Plus do not support USB OTG

quangan — Mon, 01 Apr 2024 06:08:28 GMT

I find that 8m mini support usb otg in the datasheet, but i can't find the similar word in 8m Plus. Is it not supported?

Re: IMX 8m Plus do not support USB OTG

Harvey021 — Tue, 02 Apr 2024 06:20:46 GMT

Currently, DRD is used instead of OTG, mainly for Type-C, so the OTG ID PIN is no longer needed.

Regards

Harvey

Re: IMX 8m Plus do not support USB OTG

hustdage — Tue, 02 Apr 2024 13:25:38 GMT

the OTG ID PIN is no longer needed?

But i.MX8MP even has no CC pin, how this chip can support typeC without peripheral circuits?

Without typeC peripheral circuits, how i.MX8MP can do role switch as you said "the OTG ID PIN is no longer needed"?

It is changed to using gpio usb id from a dedicated usb id pin from the infomation in schematic.

As I know linux can deal with the DRD message from typeC and gpio usb id pin both.

The default usb id in linux is using gpio as usb id.

Could you please explain the following?

Re: IMX 8m Plus do not support USB OTG

Harvey021 — Wed, 03 Apr 2024 07:04:23 GMT

It mainly depends on whether the physical interface is type-c or OTG's AB interface. If it is Type-c, then you need to refer to the development board and add a ptn5110. If it is the AB interface of OTG, then the ID pin needs to be connected to a GPIO, software Here you need to use a GPIO-based exton driver.

&usb_dwc3_0 {
dr_mode = "otg";
hnp-disable;
srp-disable;
adp-disable;
extcon = <&extcon_usb0>;
status = "okay";
};

extcon_usb0: extcon-usb0 {
compatible = "linux,extcon-usb-gpio";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb0_extcon>;
id-gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>;
};

arch\arm64\boot\dts\freescale\imx8mp-msc-sm2s.dtsi Example of third-party boards, it requires the OTG ID pin to generate an interrupt. USB_DNUx cannot be used as GPIO and cannot generate interrupts, so the OTG Driver cannot run.

Regards

Harvey

Re: IMX 8m Plus do not support USB OTG

hustdage — Wed, 03 Apr 2024 23:51:29 GMT

I don't need you to explain anything. I know that than you can do.

I asked you to explain is to ask NXP to improve support quality.

OTG's AB interface?

Have you read Cable and Connector Specification?

AB interface could be a OTG?

Even USB 3.0 A SS and USB 3.0 B SS have no id pin defined. How it can be " OTG's AB interface"?