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

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 7/23/26 3:28 PM, Srinivas Kandagatla wrote:
> 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.

Ah, sad. Thanks for explaining

Konrad

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