diff --git a/[refs] b/[refs]
index cb494c26ae31..435936160ac7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0bbeb3c3e84bc963d1c66661e082d207023b0e5c
+refs/heads/master: ab72fa5523866cb93681abb9f9a401d43a93b7be
diff --git a/trunk/Documentation/devicetree/bindings/tty/serial/of-serial.txt b/trunk/Documentation/devicetree/bindings/tty/serial/of-serial.txt
index ba385f2e0ddc..1e1145ca4f3c 100644
--- a/trunk/Documentation/devicetree/bindings/tty/serial/of-serial.txt
+++ b/trunk/Documentation/devicetree/bindings/tty/serial/of-serial.txt
@@ -14,7 +14,10 @@ Required properties:
 	- "serial" if the port type is unknown.
 - reg : offset and length of the register set for the device.
 - interrupts : should contain uart interrupt.
-- clock-frequency : the input clock frequency for the UART.
+- clock-frequency : the input clock frequency for the UART
+	 or
+  clocks phandle to refer to the clk used as per Documentation/devicetree
+  /bindings/clock/clock-bindings.txt
 
 Optional properties:
 - current-speed : the current active speed of the UART.