serial: fsl_lpuart: documented the clock requirement.

[cascardo/linux.git] / Documentation / devicetree / bindings / serial / fsl-lpuart.txt

diff --git a/Documentation/devicetree/bindings/serial/fsl-lpuart.txt b/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
index 6fd1dd1..a1d1205 100644 (file)
--- a/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
+++ b/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
@@ -4,11 +4,24 @@ Required properties:
 - compatible : Should be "fsl,<soc>-lpuart"
 - reg : Address and length of the register set for the device
 - interrupts : Should contain uart interrupt
+- clocks : phandle + clock specifier pairs, one for each entry in clock-names
+- clock-names : should contain: "ipg" - the uart clock
+
+Optional properties:
+- dmas: A list of two dma specifiers, one for each entry in dma-names.
+- dma-names: should contain "tx" and "rx".
+
+Note: Optional properties for DMA support. Write them both or both not.
 
 Example:
 
 uart0: serial@40027000 {
-              compatible = "fsl,vf610-lpuart";
-              reg = <0x40027000 0x1000>;
-              interrupts = <0 61 0x00>;
-       };
+               compatible = "fsl,vf610-lpuart";
+               reg = <0x40027000 0x1000>;
+               interrupts = <0 61 0x00>;
+               clocks = <&clks VF610_CLK_UART0>;
+               clock-names = "ipg";
+               dmas = <&edma0 0 2>,
+                       <&edma0 0 3>;
+               dma-names = "rx","tx";
+       };