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serial: mxs-auart: add the DMA support for mx28

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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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Huang Shijie 2012-11-16 16:03:53 +08:00 • committed by Greg Kroah-Hartman
commit e800163281
2 changed files with 325 additions and 5 deletions
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8
Documentation/devicetree/bindings/tty/serial/fsl-mxs-auart.txt
View file

@ -6,11 +6,19 @@ Required properties:
- reg : Address and length of the register set for the device
- interrupts : Should contain the auart interrupt numbers
Optional properties:
- fsl,auart-dma-channel : The DMA channels, the first is for RX, the other
is for TX. If you add this property, it also means that you
will enable the DMA support for the auart.
Note: due to the hardware bug in imx23(see errata : 2836),
only the imx28 can enable the DMA support for the auart.
Example:
auart0: serial@8006a000 {
compatible = "fsl,imx28-auart", "fsl,imx23-auart";
reg = <0x8006a000 0x2000>;
interrupts = <112 70 71>;
fsl,auart-dma-channel = <8 9>;
};
Note: Each auart port should have an alias correctly numbered in "aliases"