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Only we meet the following conditions, we can enable the DMA support for
auart:
(1) We enable the DMA support in the dts file, such as
arch/arm/boot/dts/imx28.dtsi.
(2) We enable the hardware flow control.
(3) We use the mx28, not the mx23. Due to hardware bug(see errata: 2836),
we can not add the DMA support to mx23.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
36 lines
981 B
Plaintext
36 lines
981 B
Plaintext
* Freescale MXS Application UART (AUART)
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Required properties:
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- compatible : Should be "fsl,<soc>-auart". The supported SoCs include
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imx23 and imx28.
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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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Optional properties:
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- fsl,auart-dma-channel : The DMA channels, the first is for RX, the other
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is for TX. If you add this property, it also means that you
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will enable the DMA support for the auart.
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Note: due to the hardware bug in imx23(see errata : 2836),
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only the imx28 can enable the DMA support for the auart.
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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 70 71>;
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fsl,auart-dma-channel = <8 9>;
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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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