1 files changed, 14 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/usb/gr-udc.txt b/Documentation/devicetree/bindings/usb/gr-udc.txt
index 0c5118f7a916..e9445224fabd 100644
--- a/Documentation/devicetree/bindings/usb/gr-udc.txt
+++ b/Documentation/devicetree/bindings/usb/gr-udc.txt
@@ -12,17 +12,23 @@ Required properties:
 
 - reg : Address and length of the register set for the device
 
-- interrupts : Interrupt numbers for this device
+- interrupts : Interrupt numbers for this device. Either one interrupt number
+        for all interrupts, or one for status related interrupts, one for IN
+        endpoint related interrupts and one for OUT endpoint related interrupts.
 
 Optional properties:
 
-- epobufsizes : An array of buffer sizes for OUT endpoints. If the property is
-        not present, or for endpoints outside of the array, 1024 is assumed by
-        the driver.
-
-- epibufsizes : An array of buffer sizes for IN endpoints. If the property is
-        not present, or for endpoints outside of the array, 1024 is assumed by
-        the driver.
+- epobufsizes : Array of buffer sizes for OUT endpoints when they differ
+        from the default size of 1024. The array is indexed by the OUT endpoint
+        number. If the property is present it typically contains one entry for
+        each OUT endpoint of the core. Fewer entries overrides the default sizes
+        only for as many endpoints as the array contains.
+
+- epibufsizes : Array of buffer sizes for IN endpoints when they differ
+        from the default size of 1024. The array is indexed by the IN endpoint
+        number. If the property is present it typically contains one entry for
+        each IN endpoint of the core. Fewer entries overrides the default sizes
+        only for as many endpoints as the array contains.
 
 For further information look in the documentation for the GLIB IP core library:
 http://www.gaisler.com/products/grlib/grip.pdf