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With the generic DMA device tree helper supported by mxs-dma driver, client devices only need to call dma_request_slave_channel() for requesting a DMA channel from dmaengine. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Wolfram Sang <wsa@the-dreams.de>
26 lines
743 B
Plaintext
26 lines
743 B
Plaintext
* Freescale MXS Inter IC (I2C) Controller
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Required properties:
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- compatible: Should be "fsl,<chip>-i2c"
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- reg: Should contain registers location and length
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- interrupts: Should contain ERROR interrupt number
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- clock-frequency: Desired I2C bus clock frequency in Hz.
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Only 100000Hz and 400000Hz modes are supported.
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- dmas: DMA specifier, consisting of a phandle to DMA controller node
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and I2C DMA channel ID.
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Refer to dma.txt and fsl-mxs-dma.txt for details.
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- dma-names: Must be "rx-tx".
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Examples:
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i2c0: i2c@80058000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,imx28-i2c";
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reg = <0x80058000 2000>;
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interrupts = <111>;
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clock-frequency = <100000>;
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dmas = <&dma_apbx 6>;
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dma-names = "rx-tx";
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};
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