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.
These two patches add support for defining a mapping between sample widths and sample slots. This allows audio_graph_card2 to be used in these situations instead of having to write a custom machine driver.
Richard Fitzgerald (2): ASoC: dt-bindings: audio-graph-port: Add dai-tdm-slot-width-map ASoC: audio_graph_card2: Add support for variable slot widths
.../bindings/sound/audio-graph-port.yaml | 7 ++ include/sound/simple_card_utils.h | 10 ++ sound/soc/generic/audio-graph-card2.c | 4 + sound/soc/generic/simple-card-utils.c | 93 +++++++++++++++++++ 4 files changed, 114 insertions(+)