Messages in this thread | | | Subject | Re: [PATCH v3 6/6] ASoC: qdsp6: dt-bindings: Add q6afe pcm dt binding documentation | From | Srinivas Kandagatla <> | Date | Wed, 12 Feb 2020 11:43:37 +0000 |
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On 12/02/2020 11:01, Adam Serbinski wrote: >>> >>> + >>> + - qcom,pcm-slot-mapping >>> + Usage: required for pcm interface >> >> Are these not specific to 8k and 16k mode ? >> We should probably list values for both modes here. > > No, this is just the offset that the audio sample is placed in with > respect to a maximum of 4 slots, 16 bits wide, beginning with the sync > pulse.
That's not true atleast by the QDSP documentation, according to it we will use more slots to transfer at higher sample rate. ex: 16 kHz data can be transferred using 8 kHz samples in two slots.
Also there are 32 slots for each of 4 supported channels for PCM AFE port.
> > When switching between 8 and 16k sample rate, it is just the sync pulse > rate that is changed. The audio sample will be delivered in the same > slot, just at a different frequency.
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