diff options
Diffstat (limited to 'Documentation/usb')
| -rw-r--r-- | Documentation/usb/chipidea.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/usb/chipidea.txt b/Documentation/usb/chipidea.txt index edf7cdfddc88..059ee3251e63 100644 --- a/Documentation/usb/chipidea.txt +++ b/Documentation/usb/chipidea.txt @@ -32,7 +32,10 @@ cat /sys/kernel/debug/ci_hdrc.0/registers B-device should take host role and enumrate A-device. 4) A-device switch back to host. - On B-device: + On A-device: + echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req + + or, on B-device: echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req or, by introducing HNP polling, B-Host can know when A-peripheral wish |