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The DMIC DAI driver specifies a number of 1 to 8 channels for each DAI. The actual number of mics can currently not be configured in the device tree or audio glue, but is derived from the min/max channels of the CPU and codec DAI. A typical CPU DAI has two or more channels, in consequence a single mic is treated as a stereo/multi channel device, even though only one channel carries audio data. This change adds the option to specify the number of used DMIC channels in the device tree. When specified this value overwrites the default channels_max value of 8 in the snd_soc_dai_driver struct of the codec. Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>
19 lines
450 B
Plaintext
19 lines
450 B
Plaintext
Device-Tree bindings for Digital microphone (DMIC) codec
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This device support generic PDM digital microphone.
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Required properties:
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- compatible: should be "dmic-codec".
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Optional properties:
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- dmicen-gpios: GPIO specifier for dmic to control start and stop
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- num-channels: Number of microphones on this DAI
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Example node:
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dmic_codec: dmic@0 {
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compatible = "dmic-codec";
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dmicen-gpios = <&gpio4 3 GPIO_ACTIVE_HIGH>;
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num-channels = <1>;
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};
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