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authorBarry Song <Baohua.Song@csr.com>2014-03-27 15:49:31 +0800
committerVinod Koul <vinod.koul@intel.com>2014-03-29 19:20:13 +0530
commit2e041c94628c2f0b8b704dc092802ddeaa70c6e9 (patch)
tree5dce0f4735a928382b5e47be8d84c6ffe80b03f8 /Documentation
parent80b0e0abfbcf9897ee263a79bc4cbdcfeca72431 (diff)
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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 <mark.rutland@arm.com> Cc: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Barry Song <Baohua.Song@csr.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/dma/sirfsoc-dma.txt43
1 files changed, 43 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/sirfsoc-dma.txt b/Documentation/devicetree/bindings/dma/sirfsoc-dma.txt
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+++ b/Documentation/devicetree/bindings/dma/sirfsoc-dma.txt
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+* 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";
+};
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