mirror of https://gitee.com/openkylin/linux.git
83 lines
2.7 KiB
Plaintext
83 lines
2.7 KiB
Plaintext
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Freescale Generic ASoC Sound Card with ASRC support
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The Freescale Generic ASoC Sound Card can be used, ideally, for all Freescale
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SoCs connecting with external CODECs.
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The idea of this generic sound card is a bit like ASoC Simple Card. However,
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for Freescale SoCs (especially those released in recent years), most of them
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have ASRC (Documentation/devicetree/bindings/sound/fsl,asrc.txt) inside. And
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this is a specific feature that might be painstakingly controlled and merged
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into the Simple Card.
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So having this generic sound card allows all Freescale SoC users to benefit
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from the simplification of a new card support and the capability of the wide
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sample rates support through ASRC.
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Note: The card is initially designed for those sound cards who use I2S and
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PCM DAI formats. However, it'll be also possible to support those non
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I2S/PCM type sound cards, such as S/PDIF audio and HDMI audio, as long
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as the driver has been properly upgraded.
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The compatible list for this generic sound card currently:
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"fsl,imx-audio-cs42888"
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"fsl,imx-audio-wm8962"
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(compatible with Documentation/devicetree/bindings/sound/imx-audio-wm8962.txt)
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"fsl,imx-audio-sgtl5000"
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(compatible with Documentation/devicetree/bindings/sound/imx-audio-sgtl5000.txt)
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Required properties:
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- compatible : Contains one of entries in the compatible list.
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- model : The user-visible name of this sound complex
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- audio-cpu : The phandle of an CPU DAI controller
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- audio-codec : The phandle of an audio codec
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- audio-routing : A list of the connections between audio components.
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Each entry is a pair of strings, the first being the
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connection's sink, the second being the connection's
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source. There're a few pre-designed board connectors:
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* Line Out Jack
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* Line In Jack
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* Headphone Jack
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* Mic Jack
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* Ext Spk
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* AMIC (stands for Analog Microphone Jack)
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* DMIC (stands for Digital Microphone Jack)
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Note: The "Mic Jack" and "AMIC" are redundant while
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coexsiting in order to support the old bindings
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of wm8962 and sgtl5000.
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Optional properties:
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- audio-asrc : The phandle of ASRC. It can be absent if there's no
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need to add ASRC support via DPCM.
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Example:
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sound-cs42888 {
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compatible = "fsl,imx-audio-cs42888";
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model = "cs42888-audio";
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audio-cpu = <&esai>;
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audio-asrc = <&asrc>;
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audio-codec = <&cs42888>;
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audio-routing =
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"Line Out Jack", "AOUT1L",
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"Line Out Jack", "AOUT1R",
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"Line Out Jack", "AOUT2L",
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"Line Out Jack", "AOUT2R",
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"Line Out Jack", "AOUT3L",
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"Line Out Jack", "AOUT3R",
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"Line Out Jack", "AOUT4L",
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"Line Out Jack", "AOUT4R",
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"AIN1L", "Line In Jack",
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"AIN1R", "Line In Jack",
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"AIN2L", "Line In Jack",
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"AIN2R", "Line In Jack";
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};
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