117 lines
2.7 KiB
YAML
117 lines
2.7 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/dma/intel,ldma.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Lightning Mountain centralized DMA controllers.
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maintainers:
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- chuanhua.lei@intel.com
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- mallikarjunax.reddy@intel.com
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allOf:
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- $ref: dma-controller.yaml#
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properties:
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compatible:
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enum:
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- intel,lgm-cdma
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- intel,lgm-dma2tx
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- intel,lgm-dma1rx
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- intel,lgm-dma1tx
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- intel,lgm-dma0tx
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- intel,lgm-dma3
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- intel,lgm-toe-dma30
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- intel,lgm-toe-dma31
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reg:
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maxItems: 1
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"#dma-cells":
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const: 3
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description:
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The first cell is the peripheral's DMA request line.
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The second cell is the peripheral's (port) number corresponding to the channel.
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The third cell is the burst length of the channel.
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dma-channels:
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minimum: 1
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maximum: 16
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dma-channel-mask:
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maxItems: 1
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clocks:
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maxItems: 1
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resets:
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maxItems: 1
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reset-names:
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items:
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- const: ctrl
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interrupts:
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maxItems: 1
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intel,dma-poll-cnt:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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DMA descriptor polling counter is used to control the poling mechanism
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for the descriptor fetching for all channels.
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intel,dma-byte-en:
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type: boolean
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description:
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DMA byte enable is only valid for DMA write(RX).
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Byte enable(1) means DMA write will be based on the number of dwords
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instead of the whole burst.
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intel,dma-drb:
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type: boolean
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description:
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DMA descriptor read back to make sure data and desc synchronization.
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intel,dma-dburst-wr:
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type: boolean
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description:
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Enable RX dynamic burst write. When it is enabled, the DMA does RX dynamic burst;
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if it is disabled, the DMA RX will still support programmable fixed burst size of 2,4,8,16.
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It only applies to RX DMA and memcopy DMA.
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required:
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- compatible
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- reg
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additionalProperties: false
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examples:
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- |
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dma0: dma-controller@e0e00000 {
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compatible = "intel,lgm-cdma";
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reg = <0xe0e00000 0x1000>;
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#dma-cells = <3>;
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dma-channels = <16>;
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dma-channel-mask = <0xFFFF>;
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interrupt-parent = <&ioapic1>;
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interrupts = <82 1>;
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resets = <&rcu0 0x30 0>;
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reset-names = "ctrl";
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clocks = <&cgu0 80>;
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intel,dma-poll-cnt = <4>;
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intel,dma-byte-en;
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intel,dma-drb;
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};
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- |
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dma3: dma-controller@ec800000 {
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compatible = "intel,lgm-dma3";
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reg = <0xec800000 0x1000>;
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clocks = <&cgu0 71>;
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resets = <&rcu0 0x10 9>;
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#dma-cells = <3>;
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intel,dma-poll-cnt = <16>;
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intel,dma-byte-en;
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intel,dma-dburst-wr;
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};
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