From 9bb86777fb71eeb7cec0c906b6a4d3432c683507 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Wed, 9 Nov 2016 11:30:25 +0900 Subject: 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 Reviewed-by: Peter Chen Signed-off-by: Kishon Vijay Abraham I --- .../ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-platform-phy-rcar-gen3-usb2 (limited to 'Documentation/ABI') 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//role +Date: October 2016 +KernelVersion: 4.10 +Contact: Yoshihiro Shimoda +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. -- cgit