63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
QCOM ADM DMA Controller
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Required properties:
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- compatible: must contain "qcom,adm" for IPQ/APQ8064 and MSM8960
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- reg: Address range for DMA registers
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- interrupts: Should contain one interrupt shared by all channels
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- #dma-cells: must be <2>. First cell denotes the channel number. Second cell
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denotes CRCI (client rate control interface) flow control assignment.
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- clocks: Should contain the core clock and interface clock.
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- clock-names: Must contain "core" for the core clock and "iface" for the
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interface clock.
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- resets: Must contain an entry for each entry in reset names.
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- reset-names: Must include the following entries:
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- clk
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- c0
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- c1
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- c2
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- qcom,ee: indicates the security domain identifier used in the secure world.
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Example:
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adm_dma: dma@18300000 {
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compatible = "qcom,adm";
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reg = <0x18300000 0x100000>;
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interrupts = <0 170 0>;
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#dma-cells = <2>;
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clocks = <&gcc ADM0_CLK>, <&gcc ADM0_PBUS_CLK>;
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clock-names = "core", "iface";
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resets = <&gcc ADM0_RESET>,
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<&gcc ADM0_C0_RESET>,
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<&gcc ADM0_C1_RESET>,
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<&gcc ADM0_C2_RESET>;
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reset-names = "clk", "c0", "c1", "c2";
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qcom,ee = <0>;
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};
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DMA clients must use the format descripted in the dma.txt file, using a three
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cell specifier for each channel.
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Each dmas request consists of 3 cells:
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1. phandle pointing to the DMA controller
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2. channel number
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3. CRCI assignment, if applicable. If no CRCI flow control is required, use 0.
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The CRCI is used for flow control. It identifies the peripheral device that
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is the source/destination for the transferred data.
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Example:
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spi4: spi@1a280000 {
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status = "ok";
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spi-max-frequency = <50000000>;
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pinctrl-0 = <&spi_pins>;
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pinctrl-names = "default";
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cs-gpios = <&qcom_pinmux 20 0>;
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dmas = <&adm_dma 6 9>,
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<&adm_dma 5 10>;
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dma-names = "rx", "tx";
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};
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