diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2016-11-09 11:30:25 +0900 |
|---|---|---|
| committer | Kishon Vijay Abraham I <kishon@ti.com> | 2016-11-18 18:19:15 +0530 |
| commit | 9bb86777fb71eeb7cec0c906b6a4d3432c683507 (patch) | |
| tree | bcbcc512c9e02469441889f0707dbc3ea579b255 /Documentation/ABI | |
| parent | 23e9b38d8e7250ef1e202aea5df8d268601a3b5f (diff) | |
phy: rcar-gen3-usb2: add sysfs for usb role swap
This patch adds sysfs "role" for usb role swap. This parameter can be
read and write. If you use this file as the following, you can swap
the usb role.
For example:
1) Connect a usb cable using 2 Salvator-x boards
2) On A-Device (ID pin is low), you input the following command:
# echo peripheral > /sys/devices/platform/soc/ee080200.usb-phy/role
3) On B-Device (ID pin is high), 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. (even if you disconnect the usb
cable, since id state may be the same, the A-Device keeps to act as
peripheral.)
# echo host > /sys/devices/platform/soc/ee080200.usb-phy/role
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 b/Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 new file mode 100644 index 000000000000..6212697bbf6f --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 @@ -0,0 +1,15 @@ +What: /sys/devices/platform/<phy-name>/role +Date: October 2016 +KernelVersion: 4.10 +Contact: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> +Description: + This file can be read and write. + The file can show/change the phy mode for role swap of usb. + + Write the following strings 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. |