i.MX ProcessorsのトピックRe: USB_OTG works as USB host

USB_OTG works as USB host

wangtsungli — Tue, 16 Oct 2018 08:48:57 GMT

Hi Community,

I'm working on i.MX6 Quad sabre-SD and build Android 6.0 as my OS system.

I'm trying to designed OTG not only device mode but also a HOST mode.

The condition now is my OTG could burn image via MFGTOOL by connecting OTG.(Means my OTG could be device mode)

But my mouse cannot work if I plugin OTG.(Means my OTG could not be host mode)

Is that anything I need to be mentioned in DTS settings or driver settings or fstab.freescale?

Or my hardware designed issued?

Thanks in Advanced!

Re: USB_OTG works as USB host

igorpadykov — Tue, 16 Oct 2018 10:03:55 GMT

Hi tsung

USB_OTG_ID should be low in host mode, one can check this signal.

Various usb tests can be found in unit test package:

https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_usb_test?h=imx_4.9.88_2.0.0_ga

Best regards
igor
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Re: USB_OTG works as USB host

wangtsungli — Wed, 17 Oct 2018 02:16:51 GMT

igorpadykov‌

igorpadykov 留言:
Hi tsung

USB_OTG_ID should be low in host mode, one can check this signal.
Various usb tests can be found in unit test package:
https://source.codeaurora.org/external/imx/imx-test/tree/test/mxc_usb_test?h=imx_4.9.88_2.0.0_ga

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

I've check when I want to be the host mode ID ping will not change to low.

It will still high.

Is there any settings I need to set?

Below is my DTS settings for ID pin

&usbotg {
vbus-supply = <&reg_usb_otg_vbus>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usbotg>;
disable-over-current;
srp-disable;
hnp-disable;
adp-disable;
status = "okay";
};
pinctrl_usbotg: usbotggrp {
fsl,pins = <
MX6QDL_PAD_ENET_RX_ER__USB_OTG_ID 0x17059
>;
};

For hardware designed my ID pin will pull high， is this design correct?

Re: USB_OTG works as USB host

igorpadykov — Wed, 17 Oct 2018 03:08:31 GMT

Hi tsung

dts example can be found on

imx6qdl-sabresd.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor

Re: USB_OTG works as USB host

wangtsungli — Wed, 17 Oct 2018 05:34:50 GMT

igorpadykov 留言:
Hi tsung

dts example can be found on
imx6qdl-sabresd.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor

igorpadykov‌

Thanks for your reference.

Now my OTG can be device and host.

But there is coming new issue.

Below is my hardware design for ID.

If I did not plugin otg, ID would be high because of the pull high design.

At this condition, my EIM_D22 USB power pin are not stable at low.

It changed low to high and high to low.

How can I fix this problem?

Is there anything I need to mentioned?

Re: USB_OTG works as USB host

igorpadykov — Wed, 17 Oct 2018 05:37:53 GMT

Hi tsung

for new porblems please create new threads.

Best regards
igor