How to monitor usb over-current in imx28

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How to monitor usb over-current in imx28

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Contributor III

Hi,

We are using imx28 board.

lltib package is 130130.

Driver : USB

Our doubt is how to monitor over-current on usb port.

So that we have to disable power enable pin of usb once over-current is detected.

Please let us know what all changes have to be made in kernel in order to monitor usb overcurrent & disable power to usb once it gets overcurrent.

Please reply ASAP

Thanks in advance

Rgds

Srinivasan

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NXP TechSupport
NXP TechSupport

Hi srinivasan,

actually you can use any gpio for monitoring over-current.

Please look how it is implemented in i.MX53 Linux sources,

description in Linux Doc Bundle mx53_start_linux.pdf,

arch/arm/mach-mx5/mx53_evk.c

static struct pad_desc mx53evk_pads[] = {

    /* USB OTG USB_OC */

    MX53_PAD_EIM_A24__GPIO_5_4,

    /* USB OTG USB_PWR */

    MX53_PAD_EIM_A23__GPIO_6_6,..

IMX53QSB: i.MX53 Quick Start Board

MX53_1109_LINUXDOCS_BUNDLE

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