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|
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/sound/fsl,rpmsg.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NXP Audio RPMSG CPU DAI Controller
maintainers:
- Shengjiu Wang <shengjiu.wang@nxp.com>
description: |
fsl_rpmsg is a virtual audio device. Mapping to real hardware devices
are SAI, MICFIL, DMA controlled by Cortex M core. What we see from
Linux side is a device which provides audio service by rpmsg channel.
We can create different sound cards which access different hardwares
such as SAI, MICFIL, .etc through building rpmsg channels between
Cortex-A and Cortex-M.
allOf:
- $ref: sound-card-common.yaml#
properties:
compatible:
enum:
- fsl,imx7ulp-rpmsg-audio
- fsl,imx8mn-rpmsg-audio
- fsl,imx8mm-rpmsg-audio
- fsl,imx8mp-rpmsg-audio
- fsl,imx8ulp-rpmsg-audio
- fsl,imx93-rpmsg-audio
clocks:
items:
- description: Peripheral clock for register access
- description: Master clock
- description: DMA clock for DMA register access
- description: Parent clock for multiple of 8kHz sample rates
- description: Parent clock for multiple of 11kHz sample rates
clock-names:
items:
- const: ipg
- const: mclk
- const: dma
- const: pll8k
- const: pll11k
power-domains:
description:
List of phandle and PM domain specifier as documented in
Documentation/devicetree/bindings/power/power_domain.txt
maxItems: 1
memory-region:
maxItems: 1
description:
phandle to a node describing reserved memory (System RAM memory)
The M core can't access all the DDR memory space on some platform,
So reserved a specific memory for dma buffer which M core can
access.
(see bindings/reserved-memory/reserved-memory.txt)
audio-codec:
$ref: /schemas/types.yaml#/definitions/phandle
description: The phandle to a node of audio codec
fsl,enable-lpa:
$ref: /schemas/types.yaml#/definitions/flag
description: enable low power audio path.
fsl,rpmsg-out:
$ref: /schemas/types.yaml#/definitions/flag
description: |
This is a boolean property. If present, the transmitting function
will be enabled.
fsl,rpmsg-in:
$ref: /schemas/types.yaml#/definitions/flag
description: |
This is a boolean property. If present, the receiving function
will be enabled.
fsl,rpmsg-channel-name:
$ref: /schemas/types.yaml#/definitions/string
description: |
A string property to assign rpmsg channel this sound card sits on.
This property can be omitted if there is only one sound card and it sits
on "rpmsg-audio-channel".
enum:
- rpmsg-audio-channel
- rpmsg-micfil-channel
required:
- compatible
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/clock/imx8mn-clock.h>
rpmsg_audio: rpmsg_audio {
compatible = "fsl,imx8mn-rpmsg-audio";
model = "wm8524-audio";
fsl,enable-lpa;
fsl,rpmsg-out;
clocks = <&clk IMX8MN_CLK_SAI3_IPG>,
<&clk IMX8MN_CLK_SAI3_ROOT>,
<&clk IMX8MN_CLK_SDMA3_ROOT>,
<&clk IMX8MN_AUDIO_PLL1_OUT>,
<&clk IMX8MN_AUDIO_PLL2_OUT>;
clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
};
- |
#include <dt-bindings/clock/imx8mm-clock.h>
rpmsg_micfil: audio-controller {
compatible = "fsl,imx8mm-rpmsg-audio";
model = "micfil-audio";
fsl,rpmsg-channel-name = "rpmsg-micfil-channel";
fsl,enable-lpa;
fsl,rpmsg-in;
clocks = <&clk IMX8MM_CLK_PDM_IPG>,
<&clk IMX8MM_CLK_PDM_ROOT>,
<&clk IMX8MM_CLK_SDMA3_ROOT>,
<&clk IMX8MM_AUDIO_PLL1_OUT>,
<&clk IMX8MM_AUDIO_PLL2_OUT>;
clock-names = "ipg", "mclk", "dma", "pll8k", "pll11k";
};
...
|
