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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-aac0e830b2dsm206705966b.8.2024.12.20.12.03.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 Dec 2024 12:03:24 -0800 (PST) Message-ID: <9cbdca90-e76c-4ebb-a236-a0edbd94a629@oss.qualcomm.com> Date: Fri, 20 Dec 2024 21:03:21 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v3 1/5] dt-bindings: net: wireless: Describe ath12k PCI module with WSI To: Raj Kumar Bhagat , ath12k@lists.infradead.org Cc: linux-wireless@vger.kernel.org, Kalle Valo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jeff Johnson , Bjorn Andersson , Konrad Dybcio , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20241105180444.770951-1-quic_rajkbhag@quicinc.com> <20241105180444.770951-2-quic_rajkbhag@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20241105180444.770951-2-quic_rajkbhag@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: VdOFuZPOscaNUNWOY7R4iVx9avktLTse X-Proofpoint-ORIG-GUID: VdOFuZPOscaNUNWOY7R4iVx9avktLTse X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 adultscore=0 spamscore=0 clxscore=1015 impostorscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412200161 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 > --- 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