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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,audmix.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NXP Audio Mixer (AUDMIX).
maintainers:
- Shengjiu Wang <shengjiu.wang@nxp.com>
- Frank Li <Frank.Li@nxp.com>
description: |
The Audio Mixer is a on-chip functional module that allows mixing of two
audio streams into a single audio stream. Audio Mixer has two input serial
audio interfaces. These are driven by two Synchronous Audio interface
modules (SAI). Each input serial interface carries 8 audio channels in its
frame in TDM manner. Mixer mixes audio samples of corresponding channels
from two interfaces into a single sample. Before mixing, audio samples of
two inputs can be attenuated based on configuration. The output of the
Audio Mixer is also a serial audio interface. Like input interfaces it has
the same TDM frame format. This output is used to drive the serial DAC TDM
interface of audio codec and also sent to the external pins along with the
receive path of normal audio SAI module for readback by the CPU.
The output of Audio Mixer can be selected from any of the three streams
- serial audio input 1
- serial audio input 2
- mixed audio
Mixing operation is independent of audio sample rate but the two audio
input streams must have same audio sample rate with same number of channels
in TDM frame to be eligible for mixing.
properties:
compatible:
const: fsl,imx8qm-audmix
reg:
maxItems: 1
clocks:
maxItems: 1
clock-names:
items:
- const: ipg
power-domains:
maxItems: 1
dais:
description: contain a list of phandles to AUDMIX connected DAIs.
$ref: /schemas/types.yaml#/definitions/phandle-array
minItems: 2
items:
- description: the AUDMIX output
maxItems: 1
- description: serial audio input 1
maxItems: 1
- description: serial audio input 2
maxItems: 1
ports:
$ref: /schemas/graph.yaml#/properties/ports
patternProperties:
'^port@[0-1]':
$ref: audio-graph-port.yaml#
unevaluatedProperties: false
description: Input port from SAI TX
properties:
port@2:
$ref: audio-graph-port.yaml#
unevaluatedProperties: false
description: Output port to SAI RX
required:
- compatible
- reg
- clocks
- clock-names
- power-domains
unevaluatedProperties: false
examples:
- |
audmix@59840000 {
compatible = "fsl,imx8qm-audmix";
reg = <0x59840000 0x10000>;
clocks = <&amix_lpcg 0>;
clock-names = "ipg";
power-domains = <&pd_audmix>;
dais = <&sai4>, <&sai5>;
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
playback-only;
amix_endpoint0: endpoint {
dai-tdm-slot-num = <8>;
dai-tdm-slot-width = <32>;
dai-tdm-slot-width-map = <32 8 32>;
dai-format = "dsp_a";
remote-endpoint = <&be00_ep>;
};
};
port@1 {
reg = <1>;
playback-only;
amix_endpoint1: endpoint {
dai-tdm-slot-num = <8>;
dai-tdm-slot-width = <32>;
dai-tdm-slot-width-map = <32 8 32>;
dai-format = "dsp_a";
remote-endpoint = <&be01_ep>;
};
};
port@2 {
reg = <2>;
capture-only;
amix_endpoint2: endpoint {
dai-tdm-slot-num = <8>;
dai-tdm-slot-width = <32>;
dai-tdm-slot-width-map = <32 8 32>;
dai-format = "dsp_a";
bitclock-master;
frame-master;
remote-endpoint = <&be02_ep>;
};
};
};
};
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