Commit 01e3ad86 authored by Peter Chen's avatar Peter Chen Committed by Greg Kroah-Hartman
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doc: usb: chipidea: add usb wakeup enable example 



Add the example for how to enable USB as system wakeup source.

Signed-off-by: default avatarPeter Chen <peter.chen@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6d653110

Documentation/usb/chipidea.txt

+21 −0
Original line number Original line Diff line number Diff line
@@ -69,3 +69,24 @@ cat /sys/kernel/debug/ci_hdrc.0/registers 
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"On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification

"On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification

July 27, 2012 Revision 2.0 version 1.1a"

July 27, 2012 Revision 2.0 version 1.1a"



2. How to enable USB as system wakeup source

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

Below is the example for how to enable USB as system wakeup source

at imx6 platform.



2.1 Enable core's wakeup

echo enabled > /sys/bus/platform/devices/ci_hdrc.0/power/wakeup

2.2 Enable glue layer's wakeup

echo enabled > /sys/bus/platform/devices/2184000.usb/power/wakeup

2.3 Enable PHY's wakeup (optional)

echo enabled > /sys/bus/platform/devices/20c9000.usbphy/power/wakeup

2.4 Enable roothub's wakeup

echo enabled > /sys/bus/usb/devices/usb1/power/wakeup

2.5 Enable related device's wakeup

echo enabled > /sys/bus/usb/devices/1-1/power/wakeup



If the system has only one usb port, and you want usb wakeup at this port, you

can use below script to enable usb wakeup.

for i in $(find /sys -name wakeup | grep usb);do echo enabled > $i;done;