Add documentation about new dts bindings following new support for compatible "fsl,imx-audio-generic".
Some CPU DAI don't require a real audio codec. The new compatible "fsl,imx-audio-generic" allows to use the driver with codec drivers SPDIF DIT and SPDIF DIR as dummy codecs. It also allows to use not pre-configured audio codecs which don't require specific control through a codec driver.
The new dts properties give the possibility to set some parameters about the CPU DAI usually set through the codec configuration.
Signed-off-by: Elinor Montmasson elinor.montmasson@savoirfairelinux.com Co-authored-by: Philip-Dylan Gleonec philip-dylan.gleonec@savoirfairelinux.com --- .../bindings/sound/fsl-asoc-card.txt | 26 ++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt b/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt index 4e8dbc5abfd1..274319bf7ff7 100644 --- a/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt +++ b/Documentation/devicetree/bindings/sound/fsl-asoc-card.txt @@ -17,6 +17,9 @@ Note: The card is initially designed for those sound cards who use AC'97, I2S and PCM DAI formats. However, it'll be also possible to support those non AC'97/I2S/PCM type sound cards, such as S/PDIF audio and HDMI audio, as long as the driver has been properly upgraded. + To use CPU DAIs that do not require a codec such as an S/PDIF controller, + or to use a DAI to output or capture raw I2S/TDM data, you can + use the compatible "fsl,imx-audio-generic".
The compatible list for this generic sound card currently: @@ -48,6 +51,8 @@ The compatible list for this generic sound card currently:
"fsl,imx-audio-nau8822"
+ "fsl,imx-audio-generic" + Required properties:
- compatible : Contains one of entries in the compatible list. @@ -56,7 +61,11 @@ Required properties:
- audio-cpu : The phandle of an CPU DAI controller
- - audio-codec : The phandle of an audio codec + - audio-codec : The phandle of an audio codec. + If using the "fsl,imx-audio-generic" compatible, + give instead a pair of phandles with the + spdif_transmitter first (driver SPDIF DIT) and the + spdif_receiver second (driver SPDIF DIR).
Optional properties:
@@ -88,6 +97,21 @@ Optional properties: - bitclock-inversion : dai-link uses bit clock inversion, for details see simple-card.yaml. - mclk-id : main clock id, specific for each card configuration.
+Optional, relevant only with the "fsl,imx-audio-generic" compatible: + + - cpu-slot-width : Indicates a specific TDM slot width in bits. + - cpu-slot-num : Indicates a specific number of TDM slots per frame. + + - cpu-sysclk-freq-rx : Frequency of the CPU DAI sys clock for Rx. + - cpu-sysclk-freq-tx : Frequency of the CPU DAI sys clock for Tx. + + - cpu-sysclk-dir-rx-out : Boolean property. Specifies sys clock direction + as 'out' on initialization for Rx. + If not set, default direction is 'in'. + - cpu-sysclk-dir-tx-out : Boolean property. Specifies sys clock direction + as 'out' on initialization for Tx. + If not set, default direction is 'in'. + Optional unless SSI is selected as a CPU DAI:
- mux-int-port : The internal port of the i.MX audio muxer (AUDMUX)