On Mon, Dec 18, 2023 at 01:40:58PM +0100, Elinor Montmasson wrote: > 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 using the driver with codec drivers > SPDIF DIT and SPDIF DIR as dummy codecs. > It also allows using 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@xxxxxxxxxxxxxxxxxxxx> > Co-authored-by: Philip-Dylan Gleonec <philip-dylan.gleonec@xxxxxxxxxxxxxxxxxxxx> > --- > .../bindings/sound/fsl-asoc-card.txt | 28 ++++++++++++++++++- > 1 file changed, 27 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..f137ef2154e3 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: > > @@ -87,6 +96,23 @@ Optional properties: > - frame-inversion : dai-link uses frame clock inversion, for details see simple-card.yaml. > - bitclock-inversion : dai-link uses bit clock inversion, for details see simple-card.yaml. > - mclk-id : main clock id, specific for each card configuration. > + For multi-codec configurations, an array of ids can be > + given, one for each codec. > + > +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. Pretty sure I've seen other bindings with TDM slot properties. A sign we need something common if we don't already have something. > + > + - 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'. Looks like clock stuff. Use the clock binding. Rob
