From 2e041c94628c2f0b8b704dc092802ddeaa70c6e9 Mon Sep 17 00:00:00 2001 From: Barry Song Date: Thu, 27 Mar 2014 15:49:31 +0800 Subject: dmaengine: sirf: enable generic dt binding for dma channels move to support of_dma_request_slave_channel() and dma_request_slave_channel. we add a xlate() to let dma clients be able to find right dma_chan by generic "dmas" properties in dts. Cc: Mark Rutland Cc: Lars-Peter Clausen Signed-off-by: Barry Song Acked-by: Arnd Bergmann Signed-off-by: Vinod Koul --- .../devicetree/bindings/dma/sirfsoc-dma.txt | 43 ++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/sirfsoc-dma.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/dma/sirfsoc-dma.txt b/Documentation/devicetree/bindings/dma/sirfsoc-dma.txt new file mode 100644 index 000000000000..ecbc96ad36f8 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/sirfsoc-dma.txt @@ -0,0 +1,43 @@ +* CSR SiRFSoC DMA controller + +See dma.txt first + +Required properties: +- compatible: Should be "sirf,prima2-dmac" or "sirf,marco-dmac" +- reg: Should contain DMA registers location and length. +- interrupts: Should contain one interrupt shared by all channel +- #dma-cells: must be <1>. used to represent the number of integer + cells in the dmas property of client device. +- clocks: clock required + +Example: + +Controller: +dmac0: dma-controller@b00b0000 { + compatible = "sirf,prima2-dmac"; + reg = <0xb00b0000 0x10000>; + interrupts = <12>; + clocks = <&clks 24>; + #dma-cells = <1>; +}; + + +Client: +Fill the specific dma request line in dmas. In the below example, spi0 read +channel request line is 9 of the 2nd dma controller, while write channel uses +4 of the 2nd dma controller; spi1 read channel request line is 12 of the 1st +dma controller, while write channel uses 13 of the 1st dma controller: + +spi0: spi@b00d0000 { + compatible = "sirf,prima2-spi"; + dmas = <&dmac1 9>, + <&dmac1 4>; + dma-names = "rx", "tx"; +}; + +spi1: spi@b0170000 { + compatible = "sirf,prima2-spi"; + dmas = <&dmac0 12>, + <&dmac0 13>; + dma-names = "rx", "tx"; +}; -- cgit v1.2.3