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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /Documentation/devicetree/bindings/dma/atmel-dma.txt | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/devicetree/bindings/dma/atmel-dma.txt')
-rw-r--r-- | Documentation/devicetree/bindings/dma/atmel-dma.txt | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/atmel-dma.txt b/Documentation/devicetree/bindings/dma/atmel-dma.txt new file mode 100644 index 0000000000..f69bcf5a63 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/atmel-dma.txt @@ -0,0 +1,42 @@ +* Atmel Direct Memory Access Controller (DMA) + +Required properties: +- compatible: Should be "atmel,<chip>-dma". +- reg: Should contain DMA registers location and length. +- interrupts: Should contain DMA interrupt. +- #dma-cells: Must be <2>, used to represent the number of integer cells in +the dmas property of client devices. + +Example: + +dma0: dma@ffffec00 { + compatible = "atmel,at91sam9g45-dma"; + reg = <0xffffec00 0x200>; + interrupts = <21>; + #dma-cells = <2>; +}; + +DMA clients connected to the Atmel DMA controller must use the format +described in the dma.txt file, using a three-cell specifier for each channel: +a phandle plus two integer cells. +The three cells in order are: + +1. A phandle pointing to the DMA controller. +2. The memory interface (16 most significant bits), the peripheral interface +(16 less significant bits). +3. Parameters for the at91 DMA configuration register which are device +dependent: + - bit 7-0: peripheral identifier for the hardware handshaking interface. The + identifier can be different for tx and rx. + - bit 11-8: FIFO configuration. 0 for half FIFO, 1 for ALAP, 2 for ASAP. + +Example: + +i2c0@i2c@f8010000 { + compatible = "atmel,at91sam9x5-i2c"; + reg = <0xf8010000 0x100>; + interrupts = <9 4 6>; + dmas = <&dma0 1 7>, + <&dma0 1 8>; + dma-names = "tx", "rx"; +}; |