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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 Diff line number Diff line
@@ -69,3 +69,24 @@ cat /sys/kernel/debug/ci_hdrc.0/registers 
----------------------

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

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;