mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 03:59:55 +07:00
cc995c9ec1
This patch adds support for usb role swap via sysfs "role". For example: 1) Connect a usb cable using 2 Salvator-X boards. - For A-Device, the cable is connected to CN11 (USB3.0 ch0). - For B-Device, the cable is connected to CN9 (USB2.0 ch0). 2) On A-Device, you input the following command: # echo peripheral > /sys/devices/platform/soc/ee020000.usb/role 3) On B-Device, you input the following command: # echo host > /sys/devices/platform/soc/ee080200.usb-phy/role Then, the A-Device acts as a peripheral and the B-Device acts as a host. Please note that A-Device must input the following command if you want the board to act as a host again. # echo host > /sys/devices/platform/soc/ee020000.usb/role Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
16 lines
547 B
Plaintext
16 lines
547 B
Plaintext
What: /sys/devices/platform/<renesas_usb3's name>/role
|
|
Date: March 2017
|
|
KernelVersion: 4.13
|
|
Contact: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
|
|
Description:
|
|
This file can be read and write.
|
|
The file can show/change the drd mode of usb.
|
|
|
|
Write the following string to change the mode:
|
|
"host" - switching mode from peripheral to host.
|
|
"peripheral" - switching mode from host to peripheral.
|
|
|
|
Read the file, then it shows the following strings:
|
|
"host" - The mode is host now.
|
|
"peripheral" - The mode is peripheral now.
|