Re: [RFC PATCH v3 1/5] dt-bindings: net: wireless: Describe ath12k PCI module with WSI

Konrad Dybcio
2024-12-20T20:03:31Z

On 5.11.2024 7:04 PM, Raj Kumar Bhagat wrote:
> The QCN9274 WiFi device supports WSI (WLAN Serial Interface). WSI is used
> to exchange specific control information across radios using a doorbell
> mechanism. This WSI connection is essential for exchanging control
> information among these devices. The WSI interface in the QCN9274 includes
> TX and RX ports, which are used to connect multiple WSI-supported devices
> together, forming a WSI group.
>
> Describe QCN9274 PCI wifi device with WSI interface.
>
> Signed-off-by: Raj Kumar Bhagat <quic_rajkbhag@quicinc.com>
> ---

I think this description is missing the key points:

* what is that control information (power, data, radio stuff?)
* what happens when the OS is unaware of all of this (i.e. what happens when
we don't send any configuration)
* is this configurable, or does this describe a physical wiring topology
(what/who decides which of the group configurations detailed below take
effect)

And the ultimate question:
* can the devices not just talk among themselves and negotiate that?

Though AFAICU PCIe P2P communication is a shaky topic, so perhaps the answer
to the last question is 'no'

Konrad