142 lines
4.2 KiB
YAML
142 lines
4.2 KiB
YAML
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# 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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$id: http://devicetree.org/schemas/sound/fsl,rpmsg.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: NXP Audio RPMSG CPU DAI Controller
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maintainers:
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- Shengjiu Wang <shengjiu.wang@nxp.com>
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description: |
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fsl_rpmsg is a virtual audio device. Mapping to real hardware devices
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are SAI, MICFIL, DMA controlled by Cortex M core. What we see from
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Linux side is a device which provides audio service by rpmsg channel.
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We can create different sound cards which access different hardwares
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such as SAI, MICFIL, .etc through building rpmsg channels between
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Cortex-A and Cortex-M.
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properties:
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compatible:
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enum:
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- fsl,imx7ulp-rpmsg-audio
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- fsl,imx8mn-rpmsg-audio
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- fsl,imx8mm-rpmsg-audio
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- fsl,imx8mp-rpmsg-audio
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- fsl,imx8ulp-rpmsg-audio
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model:
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$ref: /schemas/types.yaml#/definitions/string
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description: User specified audio sound card name
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clocks:
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items:
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- description: Peripheral clock for register access
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- description: Master clock
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- description: DMA clock for DMA register access
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- description: Parent clock for multiple of 8kHz sample rates
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- description: Parent clock for multiple of 11kHz sample rates
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clock-names:
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items:
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- const: ipg
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- const: mclk
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- const: dma
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- const: pll8k
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- const: pll11k
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power-domains:
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description:
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List of phandle and PM domain specifier as documented in
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Documentation/devicetree/bindings/power/power_domain.txt
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maxItems: 1
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memory-region:
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maxItems: 1
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description:
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phandle to a node describing reserved memory (System RAM memory)
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The M core can't access all the DDR memory space on some platform,
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So reserved a specific memory for dma buffer which M core can
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access.
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(see bindings/reserved-memory/reserved-memory.txt)
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audio-codec:
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$ref: /schemas/types.yaml#/definitions/phandle
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description: The phandle to a node of audio codec
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audio-routing:
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$ref: /schemas/types.yaml#/definitions/non-unique-string-array
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description: |
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A list of the connections between audio components. Each entry is a
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pair of strings, the first being the connection's sink, the second
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being the connection's source.
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fsl,enable-lpa:
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$ref: /schemas/types.yaml#/definitions/flag
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description: enable low power audio path.
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fsl,rpmsg-out:
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$ref: /schemas/types.yaml#/definitions/flag
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description: |
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This is a boolean property. If present, the transmitting function
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will be enabled.
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fsl,rpmsg-in:
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$ref: /schemas/types.yaml#/definitions/flag
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description: |
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This is a boolean property. If present, the receiving function
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will be enabled.
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fsl,rpmsg-channel-name:
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$ref: /schemas/types.yaml#/definitions/string
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description: |
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A string property to assign rpmsg channel this sound card sits on.
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This property can be omitted if there is only one sound card and it sits
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on "rpmsg-audio-channel".
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enum:
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- rpmsg-audio-channel
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- rpmsg-micfil-channel
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required:
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- compatible
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- model
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/clock/imx8mn-clock.h>
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rpmsg_audio: rpmsg_audio {
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compatible = "fsl,imx8mn-rpmsg-audio";
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model = "wm8524-audio";
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fsl,enable-lpa;
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fsl,rpmsg-out;
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clocks = <&clk IMX8MN_CLK_SAI3_IPG>,
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<&clk IMX8MN_CLK_SAI3_ROOT>,
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<&clk IMX8MN_CLK_SDMA3_ROOT>,
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<&clk IMX8MN_AUDIO_PLL1_OUT>,
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<&clk IMX8MN_AUDIO_PLL2_OUT>;
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clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
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};
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- |
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#include <dt-bindings/clock/imx8mm-clock.h>
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rpmsg_micfil: audio-controller {
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compatible = "fsl,imx8mm-rpmsg-audio";
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model = "micfil-audio";
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fsl,rpmsg-channel-name = "rpmsg-micfil-channel";
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fsl,enable-lpa;
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fsl,rpmsg-in;
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clocks = <&clk IMX8MM_CLK_PDM_IPG>,
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<&clk IMX8MM_CLK_PDM_ROOT>,
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<&clk IMX8MM_CLK_SDMA3_ROOT>,
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<&clk IMX8MM_AUDIO_PLL1_OUT>,
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<&clk IMX8MM_AUDIO_PLL2_OUT>;
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clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
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};
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...
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