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.montmas...@savoirfairelinux.com>
Co-authored-by: Philip-Dylan Gleonec <philip-dylan.gleo...@savoirfairelinux.com>
---
.../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.
+
+ - 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:
--
2.25.1
