i.MX7ULP_EVB USB OTG enable problem

sam_liu — Fri, 20 Jul 2018 07:27:26 GMT

Hi Everyone,

I have some questions about how should I do that can correctly enable USB OTG on i.MX7ULP_EVB.

(BSP version : imx-4.9.51-8mq_ga.).

My purpose is :

Setting i.mx7ulp_evb as a "USB device" , and connect the Type-C USB port(It's is locate on i.mx7ulp_evb ) into my PC , let my PC can recognize i.mx7ulp_EVB as a USB device (eg. A mass storage)

But now my PC can't recognize the i.mx7ulp_evb as a USB device.

And I already according to "i.MX Reference Manual ,Document Number: IMXLXRM ,Rev. L4.9.51_imx8mq-beta, 01/2018" to setting parameters (These parameters almost default :y in BSP) :

============================================================

1. CONFIG_USB-Build Support for Host-side USB
2. CONFIG_USB_EHCI_HCD EHCI HCD (USB 2.0) support
Default y
3. CONFIG_USB_CHIPIDEA- ChipIdea high-speed Dual Role Controller
Default y
4. CONFIG_USB_CHIPIDEA_UDC - ChipIdea device controller
Default y
5. CONFIG_USB_CHIPIDEA_HOST - ChipIdea host controller
Default y
6. CONFIG_USB_GADGET - USB Gadget Support
Default y
7. CONFIG_USB_MXS_PHY - Freescale MXS USB PHY support
Default y

=============================================================

My question show as below:

1. The parameter : "OTG support " in menuconfig:

---Device drivers

---USB support

[ ] OTG support <------- Does this parameter should set to "y" ?

2.In the original "i.mx7ulp_evk.dts" in "imx-4.9.51-8mq_ga BSP" , the CC Logic Control : PTN5150A(it's for type-c driver ) is not setting .

Should I need to add device node PTN5150A manually or not?

3.Why I can't find the

"/sys/bus/usb/devices/usb1"

and

"/sys/bus/usb/devices/1-1" in i.mx7ulp linux kernel environment.

4.In original "&usbotg1" node in "i.mx7ulp_evk.dts" as below :

------------------------------------------------------

&usbotg1 {
vbus-supply = <&reg_usb_otg1_vbus>;
extcon = <0>, <&extcon_usb1>;
srp-disable;
hnp-disable;
adp-disable;
status = "okay";
};

----------------------------------------------------

It's neither set

dr_mode = "host"

nor

dr_mode ="peripheral"

nor

dr_mode = "otg"

Should I need to add "dr_mode = "otg" into or not?

5.In the menuconfig ,whether any parameters of my setting is incorrect?

6.What steps should I do that can enable USB otg correctly?

Thanks.

Re: i.MX7ULP_EVB USB OTG enable problem

Yuri — Fri, 27 Jul 2018 07:32:44 GMT

Hello,

Note, i.MX 7ULP is not launched and supported yet.

Nevertheless, in general, some questions may be answered as following:

Yes, OTG support is needed.

USB type-C and PD stack is supported for i.MX8.

Customers can try to implement own solution for i.MX 7ULP.

You may try the recent NXP Linux BSP L4.9.88.

At least You may try to add "dr_mode = "otg".

Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

topic i.MX7ULP_EVB USB OTG enable problem in i.MX Processors

i.MX7ULP_EVB USB OTG enable problem

Re: i.MX7ULP_EVB USB OTG enable problem