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| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2017-03-31 06:58:05 +0300 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-04-11 10:58:25 +0300 |
| commit | cc995c9ec1184b964ffdf8cf242250bb4319cd91 (patch) | |
| tree | 69d0e3d69df2de48201d6d490565f254f8b05630 /Documentation/ABI | |
| parent | fbf4987ae892619853e46c19df109d86f25eb5a3 (diff) | |
| download | linux-cc995c9ec1184b964ffdf8cf242250bb4319cd91.tar.xz | |
usb: gadget: udc: renesas_usb3: add support for usb role swap
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>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-renesas_usb3 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-renesas_usb3 b/Documentation/ABI/testing/sysfs-platform-renesas_usb3 new file mode 100644 index 000000000000..5621c15d5dc0 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-renesas_usb3 @@ -0,0 +1,15 @@ +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. |