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[POWERPC] Add docs for Freescale DMA & DMA channel device tree nodes

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Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Signed-off-by: Ebony Zhu <ebony.zhu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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Zhang Wei 2007-10-30 17:23:48 +08:00 committed by Kumar Gala
parent 0052bc5d5c
commit 457aa81a13
1 changed files with 128 additions and 0 deletions
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128
Documentation/powerpc/booting-without-of.txt
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@ -2615,6 +2615,134 @@ platforms are moved over to use the flattened-device-tree model.
- clock-frequency : The frequency of the input clock, which typically
comes from an on-board dedicated oscillator.
* Freescale 83xx DMA Controller
Freescale PowerPC 83xx have on chip general purpose DMA controllers.
Required properties:
- compatible : compatible list, contains 2 entries, first is
"fsl,CHIP-dma", where CHIP is the processor
(mpc8349, mpc8360, etc.) and the second is
"fsl,elo-dma"
- reg : <registers mapping for DMA general status reg>
- ranges : Should be defined as specified in 1) to describe the
DMA controller channels.
- cell-index : controller index. 0 for controller @ 0x8100
- interrupts : <interrupt mapping for DMA IRQ>
- interrupt-parent : optional, if needed for interrupt mapping
- DMA channel nodes:
- compatible : compatible list, contains 2 entries, first is
"fsl,CHIP-dma-channel", where CHIP is the processor
(mpc8349, mpc8350, etc.) and the second is
"fsl,elo-dma-channel"
- reg : <registers mapping for channel>
- cell-index : dma channel index starts at 0.
Optional properties:
- interrupts : <interrupt mapping for DMA channel IRQ>
(on 83xx this is expected to be identical to
the interrupts property of the parent node)
- interrupt-parent : optional, if needed for interrupt mapping
Example:
dma@82a8 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fsl,mpc8349-dma", "fsl,elo-dma";
reg = <82a8 4>;
ranges = <0 8100 1a4>;
interrupt-parent = <&ipic>;
interrupts = <47 8>;
cell-index = <0>;
dma-channel@0 {
compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
cell-index = <0>;
reg = <0 80>;
};
dma-channel@80 {
compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
cell-index = <1>;
reg = <80 80>;
};
dma-channel@100 {
compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
cell-index = <2>;
reg = <100 80>;
};
dma-channel@180 {
compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
cell-index = <3>;
reg = <180 80>;
};
};
* Freescale 85xx/86xx DMA Controller
Freescale PowerPC 85xx/86xx have on chip general purpose DMA controllers.
Required properties:
- compatible : compatible list, contains 2 entries, first is
"fsl,CHIP-dma", where CHIP is the processor
(mpc8540, mpc8540, etc.) and the second is
"fsl,eloplus-dma"
- reg : <registers mapping for DMA general status reg>
- cell-index : controller index. 0 for controller @ 0x21000,
1 for controller @ 0xc000
- ranges : Should be defined as specified in 1) to describe the
DMA controller channels.
- DMA channel nodes:
- compatible : compatible list, contains 2 entries, first is
"fsl,CHIP-dma-channel", where CHIP is the processor
(mpc8540, mpc8560, etc.) and the second is
"fsl,eloplus-dma-channel"
- cell-index : dma channel index starts at 0.
- reg : <registers mapping for channel>
- interrupts : <interrupt mapping for DMA channel IRQ>
- interrupt-parent : optional, if needed for interrupt mapping
Example:
dma@21300 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
reg = <21300 4>;
ranges = <0 21100 200>;
cell-index = <0>;
dma-channel@0 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
reg = <0 80>;
cell-index = <0>;
interrupt-parent = <&mpic>;
interrupts = <14 2>;
};
dma-channel@80 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
reg = <80 80>;
cell-index = <1>;
interrupt-parent = <&mpic>;
interrupts = <15 2>;
};
dma-channel@100 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
reg = <100 80>;
cell-index = <2>;
interrupt-parent = <&mpic>;
interrupts = <16 2>;
};
dma-channel@180 {
compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
reg = <180 80>;
cell-index = <3>;
interrupt-parent = <&mpic>;
interrupts = <17 2>;
};
};
More devices will be defined as this spec matures.