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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2017-03-31 06:58:05 +0300
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-04-11 10:58:25 +0300
commitcc995c9ec1184b964ffdf8cf242250bb4319cd91 (patch)
tree69d0e3d69df2de48201d6d490565f254f8b05630 /Documentation/ABI
parentfbf4987ae892619853e46c19df109d86f25eb5a3 (diff)
downloadlinux-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_usb315
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.