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diff --git a/Documentation/ABI/testing/sysfs-platform-renesas_usb3 b/Documentation/ABI/testing/sysfs-platform-renesas_usb3
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+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.