Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt b/kernel/Documentation/devicetree/bindings/serial/fsl-mxs-auart.txt
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+* Freescale MXS Application UART (AUART)
+
+Required properties:
+- compatible : Should be "fsl,<soc>-auart". The supported SoCs include
+  imx23 and imx28.
+- reg : Address and length of the register set for the device
+- interrupts : Should contain the auart interrupt numbers
+- dmas: DMA specifier, consisting of a phandle to DMA controller node
+  and AUART DMA channel ID.
+  Refer to dma.txt and fsl-mxs-dma.txt for details.
+- dma-names: "rx" for RX channel, "tx" for TX channel.
+
+Optional properties:
+- fsl,uart-has-rtscts : Indicate the UART has RTS and CTS lines
+  for hardware flow control,
+       it also means you enable the DMA support for this UART.
+- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
+  line respectively. It will use specified PIO instead of the peripheral
+  function pin for the USART feature.
+  If unsure, don't specify this property.
+
+Example:
+auart0: serial@8006a000 {
+       compatible = "fsl,imx28-auart", "fsl,imx23-auart";
+       reg = <0x8006a000 0x2000>;
+       interrupts = <112>;
+       dmas = <&dma_apbx 8>, <&dma_apbx 9>;
+       dma-names = "rx", "tx";
+       cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
+       dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
+       dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
+};
+
+Note: Each auart port should have an alias correctly numbered in "aliases"
+node.
+
+Example:
+
+aliases {
+       serial0 = &auart0;
+       serial1 = &auart1;
+       serial2 = &auart2;
+       serial3 = &auart3;
+       serial4 = &auart4;
+};