Messages in this thread | | | Date | Wed, 12 Feb 2020 07:07:56 -0500 | From | Adam Serbinski <> | Subject | Re: [PATCH v3 6/6] ASoC: qdsp6: dt-bindings: Add q6afe pcm dt binding documentation |
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On 2020-02-12 06:43, Srinivas Kandagatla wrote: > 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.
Ok, if that's the case, then it sounds like someone else is going to have to implement it. I have no way to test that kind of a configuration, so attempting to implement it would be futile.
> > >> >> 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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