On Thu, Feb 17, 2022 at 01:48:34PM +0000, Richard Fitzgerald wrote: > 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. > > This property allows setting a mapping of sample widths and the > corresponding tdm slot widths. > > Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx> > --- > .../devicetree/bindings/sound/audio-graph-port.yaml | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml > index 476dcb49ece6..420adad49382 100644 > --- a/Documentation/devicetree/bindings/sound/audio-graph-port.yaml > +++ b/Documentation/devicetree/bindings/sound/audio-graph-port.yaml > @@ -71,4 +71,11 @@ 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 equal to sample A variable slot width sounds like a feature, not a limitation. > + width. An array containing one or more pairs of values. Each pair > + of values is a sample_width and the corresponding slot_width. That sounds like a matrix, not an array. N entries of 2 cells each. > + $ref: /schemas/types.yaml#/definitions/uint32-array > + I'd think there are some constraints on the values? Slots should be at least 8 bits, right? A max of 2x32 bits or is there more than stereo within a slot? In any case, it's for sure no where near 2^32 max. Is there a need for specifying where in the slot the data is? Rob
