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diff --git a/Documentation/ABI/testing/sysfs-driver-hid-picolcd b/Documentation/ABI/testing/sysfs-driver-hid-picolcd
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+What:           /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode
+Date:           March 2010
+Contact:        Bruno Prémont <bonbons@linux-vserver.org>
+Description:    Make it possible to switch the PicoLCD device between LCD
+                (firmware) and bootloader (flasher) operation modes.
+
+                Reading: returns list of available modes, the active mode being
+                enclosed in brackets ('[' and ']')
+
+                Writing: causes operation mode switch. Permitted values are
+                the non-active mode names listed when read.
+
+                Note: when switching mode the current PicoLCD HID device gets
+                disconnected and reconnects after above delay (see attribute
+                operation_mode_delay for its value).
+
+
+What:           /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode_delay
+Date:           April 2010
+Contact:        Bruno Prémont <bonbons@linux-vserver.org>
+Description:    Delay PicoLCD waits before restarting in new mode when
+                operation_mode has changed.
+
+                Reading/Writing: It is expressed in ms and permitted range is
+                0..30000ms.
+
+
+What:           /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/fb_update_rate
+Date:           March 2010
+Contact:        Bruno Prémont <bonbons@linux-vserver.org>
+Description:    Make it possible to adjust defio refresh rate.
+
+                Reading: returns list of available refresh rates (expressed in Hz),
+                the active refresh rate being enclosed in brackets ('[' and ']')
+
+                Writing: accepts new refresh rate expressed in integer Hz
+                within permitted rates.
+
+                Note: As device can barely do 2 complete refreshes a second
+                it only makes sense to adjust this value if only one or two
+                tiles get changed and it's not appropriate to expect the application
+                to flush it's tiny changes explicitely at higher than default rate.
+