I am running Linux 2.6.32 on a P2020 and am trying to use the kernel’s DMA
code. So far, I have had no success. Is there a mistake in
linux/arch/powerc/boot/dts/p2020rdb.dts?
According to linux/Documentation/powerpc/dts-bindings/fsl/dma.txt, the
compatible lists for DMA controllers and the DMA channel nodes should have “2
entries, first is ‘fsl,CHIP-dma’, where CHIP is the processor (mpc8349,
mpc8360, etc.) and the second is ‘fsl,elo-dma.’” In p2020rdb.dts, the
compatible lists for the DMA controller and the DMA channel nodes are
"fsl,eloplus-dma" and "fsl,eloplus-dma-channel," respectively. Note that each
has only one entry.
Should compatible = “fsl,P2020RDB-dma”, "fsl,eloplus-dma" for the DMA
controllers?, and
Should compatible = “fsl,P2020RDB-dma”, " fsl,eloplus-dma-channel" for the DMA
channel nodes?
The device tree source for DMA in p2020rdb.dts is:
dma@c300 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fsl,eloplus-dma";
reg = <0xc300 0x4>;
ranges = <0x0 0xc100 0x200>;
cell-index = <1>;
dma-channel@0 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x0 0x80>;
cell-index = <0>;
interrupt-parent = <&mpic>;
interrupts = <76 2>;
};
dma-channel@80 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x80 0x80>;
cell-index = <1>;
interrupt-parent = <&mpic>;
interrupts = <77 2>;
};
dma-channel@100 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x100 0x80>;
cell-index = <2>;
interrupt-parent = <&mpic>;
interrupts = <78 2>;
};
dma-channel@180 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x180 0x80>;
cell-index = <3>;
interrupt-parent = <&mpic>;
interrupts = <79 2>;
};
};
dma@21300 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "fsl,eloplus-dma";
reg = <0x21300 0x4>;
ranges = <0x0 0x21100 0x200>;
cell-index = <0>;
dma-channel@0 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x0 0x80>;
cell-index = <0>;
interrupt-parent = <&mpic>;
interrupts = <20 2>;
};
dma-channel@80 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x80 0x80>;
cell-index = <1>;
interrupt-parent = <&mpic>;
interrupts = <21 2>;
};
dma-channel@100 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x100 0x80>;
cell-index = <2>;
interrupt-parent = <&mpic>;
interrupts = <22 2>;
};
dma-channel@180 {
compatible = "fsl,eloplus-dma-channel";
reg = <0x180 0x80>;
cell-index = <3>;
interrupt-parent = <&mpic>;
interrupts = <23 2>;
};
};
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