Re: [PATCH 2/3] soundwire: qcom: add multi-master support

[Pierre-Louis Bossart]

On 9/11/26 10:21, Srinivas Kandagatla wrote:
> v3.1.0+ Qualcomm SoundWire IPs can be paired to expose one logical
> bus with more than two DATA lanes. One IP owns SWR_CLK and drives
> the bus; the other contributes DATA lanes only.
> 
> Support this pairing on the driver side. A device link between the
> two IPs enforces correct unbind ordering and keeps the peer resumed
> while the primary is active.
> 
> Single-master deployments (no qcom,multi-master-mode in DT) are
> unaffected.

It'd be good to clarify how the command protocol is handled. Each IP is
probably capable of handling PING/READ/WRITE commands in Column0, but in
the paired option the primary IP is the only one that deals with Column0
and all other DATA lanes are just data?