e800163281
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>
35 lines
981 B
Text
35 lines
981 B
Text
* 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
|
|
|
|
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"
|
|
node.
|
|
|
|
Example:
|
|
|
|
aliases {
|
|
serial0 = &auart0;
|
|
serial1 = &auart1;
|
|
serial2 = &auart2;
|
|
serial3 = &auart3;
|
|
serial4 = &auart4;
|
|
};
|