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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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42 lines
1.2 KiB
Plaintext
42 lines
1.2 KiB
Plaintext
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* Spreadtrum DMA controller
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This binding follows the generic DMA bindings defined in dma.txt.
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Required properties:
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- compatible: Should be "sprd,sc9860-dma".
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- reg: Should contain DMA registers location and length.
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- interrupts: Should contain one interrupt shared by all channel.
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- #dma-cells: must be <1>. Used to represent the number of integer
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cells in the dmas property of client device.
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- #dma-channels : Number of DMA channels supported. Should be 32.
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- clock-names: Should contain the clock of the DMA controller.
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- clocks: Should contain a clock specifier for each entry in clock-names.
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Example:
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Controller:
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apdma: dma-controller@20100000 {
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compatible = "sprd,sc9860-dma";
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reg = <0x20100000 0x4000>;
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interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
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#dma-cells = <1>;
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#dma-channels = <32>;
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clock-names = "enable";
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clocks = <&clk_ap_ahb_gates 5>;
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};
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Client:
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DMA clients connected to the Spreadtrum DMA controller must use the format
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described in the dma.txt file, using a two-cell specifier for each channel.
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The two cells in order are:
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1. A phandle pointing to the DMA controller.
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2. The channel id.
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spi0: spi@70a00000{
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...
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dma-names = "rx_chn", "tx_chn";
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dmas = <&apdma 11>, <&apdma 12>;
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...
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};
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