Unverified Commit 26e5366d authored Feb 28, 2022 by Richard Fitzgerald Committed by Mark Brown Mar 07, 2022

ASoC: dt-bindings: audio-graph-port: Add dai-tdm-slot-width-map



Some audio hardware cannot support a fixed slot width for all sample
widths, or a slot width equal to the sample width for all sample widths.
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. The slot count is also provided for
each slot width - although this would almost always be the same for
all slot widths this allows for possibly adding extra padding slots
to maintain a fixed bitclock frequency.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220228172754.453783-2-rf@opensource.cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>

parent 8f2b025a

Documentation/devicetree/bindings/sound/audio-graph-port.yaml

+20 −0

Original line number	Diff line number	Diff line
		@@ -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