Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / serial / fsl-lpuart.txt

diff --git a/kernel/Documentation/devicetree/bindings/serial/fsl-lpuart.txt b/kernel/Documentation/devicetree/bindings/serial/fsl-lpuart.txt
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+* Freescale low power universal asynchronous receiver/transmitter (lpuart)
+
+Required properties:
+- compatible :
+  - "fsl,vf610-lpuart" for lpuart compatible with the one integrated
+    on Vybrid vf610 SoC with 8-bit register organization
+  - "fsl,ls1021a-lpuart" for lpuart compatible with the one integrated
+    on LS1021A SoC with 32-bit big-endian register organization
+- 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>;
+               clocks = <&clks VF610_CLK_UART0>;
+               clock-names = "ipg";
+               dmas = <&edma0 0 2>,
+                       <&edma0 0 3>;
+               dma-names = "rx","tx";
+       };