* Freescale MXS Application UART (AUART)
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Required properties for all SoCs:
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- compatible : Should be one of fallowing variants:
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"fsl,imx23-auart" - Freescale i.MX23
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"fsl,imx28-auart" - Freescale i.MX28
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"alphascale,asm9260-auart" - Alphascale ASM9260
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- reg : Address and length of the register set for the device
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- interrupts : Should contain the auart interrupt numbers
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- dmas: DMA specifier, consisting of a phandle to DMA controller node
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and AUART DMA channel ID.
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Refer to dma.txt and fsl-mxs-dma.txt for details.
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- dma-names: "rx" for RX channel, "tx" for TX channel.
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Required properties for "alphascale,asm9260-auart":
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- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt
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- clock-names : should be set to
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"mod" - source for tick counter.
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"ahb" - ahb gate.
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Optional properties:
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- uart-has-rtscts : Indicate the UART has RTS and CTS lines
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for hardware flow control,
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it also means you enable the DMA support for this UART.
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- {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
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line respectively. It will use specified PIO instead of the peripheral
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function pin for the USART feature.
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If unsure, don't specify this property.
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Example:
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auart0: serial@8006a000 {
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compatible = "fsl,imx28-auart", "fsl,imx23-auart";
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reg = <0x8006a000 0x2000>;
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interrupts = <112>;
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dmas = <&dma_apbx 8>, <&dma_apbx 9>;
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dma-names = "rx", "tx";
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cts-gpios = <&gpio1 15 GPIO_ACTIVE_LOW>;
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dsr-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
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dcd-gpios = <&gpio1 17 GPIO_ACTIVE_LOW>;
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};
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Note: Each auart port should have an alias correctly numbered in "aliases"
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node.
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Example:
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aliases {
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serial0 = &auart0;
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serial1 = &auart1;
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serial2 = &auart2;
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serial3 = &auart3;
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serial4 = &auart4;
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};
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