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Right now the direction of a DAI has to be specified as a literal
number in the device tree, e.g.:
dai@0 {
reg = <0>;
direction = <2>;
};
but this does not make it immediately clear that this is a
playback/RX-only DAI.
Actually, q6asm-dai.c has useful defines for this. Move them to the
dt-bindings header to allow using them in the dts(i) files.
The example above then becomes:
dai@0 {
reg = <0>;
direction = <Q6ASM_DAI_RX>;
};
which is immediately recognizable as playback/RX-only DAI.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200727082502.2341-1-stephan@gerhold.net
Signed-off-by: Mark Brown <broonie@kernel.org>
71 lines
1.7 KiB
Plaintext
71 lines
1.7 KiB
Plaintext
Qualcomm Audio Stream Manager (Q6ASM) binding
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Q6ASM is one of the APR audio service on Q6DSP.
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Please refer to qcom,apr.txt for details of the common apr service bindings
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used by the apr service device.
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- but must contain the following property:
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- compatible:
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Usage: required
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Value type: <stringlist>
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Definition: must be "qcom,q6asm-v<MAJOR-NUMBER>.<MINOR-NUMBER>".
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Or "qcom,q6asm" where the version number can be queried
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from DSP.
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example "qcom,q6asm-v2.0"
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= ASM DAIs (Digial Audio Interface)
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"dais" subnode of the ASM node represents dai specific configuration
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- compatible:
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Usage: required
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Value type: <stringlist>
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Definition: must be "qcom,q6asm-dais".
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- #sound-dai-cells
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Usage: required
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Value type: <u32>
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Definition: Must be 1
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== ASM DAI is subnode of "dais" and represent a dai, it includes board specific
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configuration of each dai. Must contain the following properties.
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- reg
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Usage: required
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Value type: <u32>
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Definition: Must be dai id
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- direction:
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Usage: Required for Compress offload dais
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Value type: <u32>
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Definition: Specifies the direction of the dai stream
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Q6ASM_DAI_TX_RX (0) for both tx and rx
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Q6ASM_DAI_TX (1) for only tx (Capture/Encode)
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Q6ASM_DAI_RX (2) for only rx (Playback/Decode)
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- is-compress-dai:
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Usage: Required for Compress offload dais
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Value type: <boolean>
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Definition: present for Compress offload dais
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= EXAMPLE
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#include <dt-bindings/sound/qcom,q6asm.h>
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apr-service@7 {
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compatible = "qcom,q6asm";
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reg = <APR_SVC_ASM>;
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q6asmdai: dais {
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compatible = "qcom,q6asm-dais";
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#address-cells = <1>;
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#size-cells = <0>;
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#sound-dai-cells = <1>;
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dai@0 {
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reg = <0>;
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direction = <Q6ASM_DAI_RX>;
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is-compress-dai;
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};
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};
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};
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