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SubjectRe: [PATCH v3 6/6] ASoC: qdsp6: dt-bindings: Add q6afe pcm dt binding documentation
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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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