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Date: Thu, 17 Jul 2014 21:46:15 +0200 From: Maxime Ripard <maxime.ripard@...e-electrons.com> To: Dan Williams <dan.j.williams@...el.com>, Vinod Koul <vinod.koul@...el.com> Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com, kevin.z.m.zh@...il.com, sunny@...winnertech.com, shuge@...winnertech.com, zhuzhenhua@...winnertech.com, Arnd Bergmann <arnd@...db.de>, andriy.shevchenko@...el.com, dmaengine@...r.kernel.org, Maxime Ripard <maxime.ripard@...e-electrons.com> Subject: [PATCH v11 1/2] Documentation: dt: Add Allwinner A31 DMA controller bindings The Allwinner A31 DMA controller is rather simple to describe in the DT. Add the bindings documentation. Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com> --- .../devicetree/bindings/dma/sun6i-dma.txt | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/sun6i-dma.txt diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt new file mode 100644 index 000000000000..3e145c1675b1 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt @@ -0,0 +1,45 @@ +Allwinner A31 DMA Controller + +This driver follows the generic DMA bindings defined in dma.txt. + +Required properties: + +- compatible: Must be "allwinner,sun6i-a31-dma" +- reg: Should contain the registers base address and length +- interrupts: Should contain a reference to the interrupt used by this device +- clocks: Should contain a reference to the parent AHB clock +- resets: Should contain a reference to the reset controller asserting + this device in reset +- #dma-cells : Should be 1, a single cell holding a line request number + +Example: + dma: dma-controller@...02000 { + compatible = "allwinner,sun6i-a31-dma"; + reg = <0x01c02000 0x1000>; + interrupts = <0 50 4>; + clocks = <&ahb1_gates 6>; + resets = <&ahb1_rst 6>; + #dma-cells = <1>; + }; + +Clients: + +DMA clients connected to the A31 DMA controller must use the format +described in the dma.txt file, using a two-cell specifier for each +channel: a phandle plus one integer cells. +The two cells in order are: + +1. A phandle pointing to the DMA controller. +2. The port ID as specified in the datasheet + +Example: +spi2: spi@...6a000 { + compatible = "allwinner,sun6i-a31-spi"; + reg = <0x01c6a000 0x1000>; + interrupts = <0 67 4>; + clocks = <&ahb1_gates 22>, <&spi2_clk>; + clock-names = "ahb", "mod"; + dmas = <&dma 25>, <&dma 25>; + dma-names = "rx", "tx"; + resets = <&ahb1_rst 22>; +}; -- 2.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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