I try to get digital audio input for 16 TDM channels on a "mcasp" on a
beaglebone working, no I2C, no SPI,... no controls, without writing a kernel
driver. Did some (re)search, I dont understand everything, just guess from
the documentations found:
There is the simple-audio-card, described in simple-audio-card.txt in the
kernel documentation, which "only" needs to write a proper device-tree overlay
nowadays for uboot-devicetree overlay on an beaglebone.
I stuck now writing the overlay, choosing a proper codec for the devicetree
file, so here my question:
Is there a simple audio-codec I can reference for this usage ?
simple_audio_card.txt says:
Required dai-link subnodes:
- cpu : CPU sub-node
- codec : CODEC sub-node
the fragment would contain:
sound_master: simple-audio-card,cpu {
sound-dai = <&mcasp0>;
clocks = <&clk_mcasp0>;
};
simple-audio-card,codec {
sound-dai = <&??????>;
};
Also any hints to further documentation is also appreciated.
Background info:
Try to generate an bitblock and framesync which clock in 16 slots of 16
bits for digital microphone array which does not have any controls using the
mcasp0 on a beaglebone green.
mfg
winfried ritsch
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