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| author | Mark Brown <broonie@kernel.org> | 2022-03-07 20:36:55 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-03-07 20:36:55 +0000 |
| commit | 3066987e11d3997db8212c6ed0aebaac0899dd5b (patch) | |
| tree | a82f2135c93fe257db9873dd4e6fadf7edb56f2e /Documentation | |
| parent | fc14fac286a05d36202f8114d00a9935ca2e0756 (diff) | |
| parent | 1e974e5b82b3d75069b50445cd248cee0199654e (diff) | |
| download | linux-3066987e11d3997db8212c6ed0aebaac0899dd5b.tar.bz2 | |
ASoC: audio_graph_card2: Support variable slot widths
Merge series from Richard Fitzgerald <rf@opensource.cirrus.com>:
This adds support for I2S/TDM links where the slot width varies
depending on the sample width, in a way that cannot be guessed by
component hw_params().
A typical example is:
- 16-bit samples use 16-bit slots
- 24-bit samples use 32-bit slots
There is no way for a component hw_params() to deduce from the information
it is passed that 24-bit samples will be in 32-bit slots.
Some audio hardware cannot support a fixed slot width or a slot width
equal to the sample width in all cases. This is usually due either to
limitations of the audio serial port or system clocking restrictions.
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/sound/audio-graph-port.yaml | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml index 476dcb49ece6..5c368674d11a 100644 --- a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml +++ b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml @@ -71,4 +71,24 @@ patternProperties: description: CPU to Codec rate channels. $ref: /schemas/types.yaml#/definitions/uint32 + dai-tdm-slot-width-map: + description: Mapping of sample widths to slot widths. For hardware + that cannot support a fixed slot width or a slot width always + equal to sample width. A matrix of one or more 3-tuples. + $ref: /schemas/types.yaml#/definitions/uint32-matrix + items: + items: + - + description: Sample width in bits + minimum: 8 + maximum: 64 + - + description: Slot width in bits + minimum: 8 + maximum: 256 + - + description: Slot count + minimum: 1 + maximum: 64 + additionalProperties: true |