Re: [RFC PATCH 7/8] dt-bindings: sound: qcom: add Tambora WCD9378 SDCA codec

[Srinivas Kandagatla]

On 7/23/26 10:14 AM, Konrad Dybcio wrote:
> On 7/23/26 1:42 AM, Srinivas Kandagatla wrote:
>> Describe the WCD9378 SDCA peripheral node (compatible sdw20217011000)
>> driven by the wcd9378-sdca codec driver for headphone playback, headset
>> mic capture and jack detection via the SimpleJack SDCA function type.
>>
>> WCD9378 codec can be wired up in 2 different modes.
>> "mobile mode" on phone/tablet SoCs is enumerated as tx and rx device,
>> each of which has dedicated control and data lines.
>> "compute mode" on compute platforms such as Glymur is enumerated as
>> single standard MIPI SDCA class device.
> 
> Does this require a different hardware wiring, or is that just a
> difference for the driver? If the latter, can we choose whichever
> mode we want (i.e. use compute mode on the Fairphone or use mobile
> mode on a laptop, depending on what the OS supports)?

AFAIU, Its not possible to change it because its fused and this also
brings in some physical bus level changes to soundwire aswell.
Ex: on compute we have one control lane for 2 soundwire masters driving
4 data lanes. on mobile every soundwire master has dedicated control and
data lanes.. Bottom line is its not possible.

However w.r.t to driver given that is same IP, I wanted to explore if we
can have a single driver for both.


--srini
> 
> Konrad