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[199.106.103.52]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2e539fa5c38sm17526024eec.5.2026.04.21.00.38.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 00:38:28 -0700 (PDT) Date: Tue, 21 Apr 2026 15:38:22 +0800 From: Shawn Guo To: Konrad Dybcio Cc: Jassi Brar , Sibi Sankar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Konrad Dybcio , Dmitry Baryshkov , Bartosz Golaszewski , Deepti Jaggi , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH 0/2] Add CPUCP mailbox support for Qualcomm Nord SoC Message-ID: References: <20260420034932.1247344-1-shengchao.guo@oss.qualcomm.com> <0c2425dd-0ba4-49ac-853b-b157eec1fdfd@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0c2425dd-0ba4-49ac-853b-b157eec1fdfd@oss.qualcomm.com> X-Authority-Analysis: v=2.4 cv=KItqylFo c=1 sm=1 tr=0 ts=69e72976 cx=c_pps a=cFYjgdjTJScbgFmBucgdfQ==:117 a=b9+bayejhc3NMeqCNyeLQQ==:17 a=kj9zAlcOel0A:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EzMJCGVPsnTdBwCGCsMA:9 a=CjuIK1q_8ugA:10 a=scEy_gLbYbu1JhEsrz4S:22 X-Proofpoint-GUID: x2cYwv2p9Mg2N5QTjl7fxZqH4fmIqlXx X-Proofpoint-ORIG-GUID: x2cYwv2p9Mg2N5QTjl7fxZqH4fmIqlXx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIxMDA3MyBTYWx0ZWRfX/I5mUdo8vMd+ mvFPkbDZ7C9+pgiW8gNfF5BeKWVRMf69s0OleAEV8Nt/Ofq4r8SJonuxowUpLLLojMm0Uxf9fQt DYDg7yXEJBA+vMGm6aBv+8SIF23/09qxq/56HwEdVdM4JpDbFTYnlm8kX3YPRlfixr9RZb/AI9Y PGDB5ipdAaAywLlm9R3pnHBbheqiv9rCpwffWOjDw+aScPbLIs+SGpheGa/KhBkXZ0d9+vBLqfr +s0+98tqDbCOosUnOiC8skzBQ3jPi+QNbr4g7ZEsognRwOFFG9SPeV9JblWPVY02AaCXxFc5S3z mUqaku42wTIAZlKiPHtsZYWqZ4pi8Y6dlF4nTcu9GEzEfPHxTvSw6wdD1AHKSa7kOnoMlclIePB 2XjFEnP8YyDyDcjIA+rgbxsy2DvTnZ3uqqDkRlpVBRVCH1nqGJmfIPe1UAJ/HfgXqgoFu528HI9 TDcVvm+jdImtyD6LKTg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-21_01,2026-04-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 phishscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 bulkscore=0 suspectscore=0 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604210073 On Mon, Apr 20, 2026 at 10:23:20AM +0200, Konrad Dybcio wrote: > On 4/20/26 5:49 AM, Shawn Guo wrote: > > This series adds CPUCP mailbox controller support for Qualcomm Nord SoC. > > > > The Nord CPUCP mailbox is functionally identical to the existing x1e80100 > > implementation, except it exposes 16 IPC channels instead of 3. Patch 1 > > adds the Nord compatible string to the DT binding. Patch 2 refactors > > the channel count from a hardcoded compile-time constant into > > a per-hardware configuration struct populated via the device tree > > match data. > > What are these channels used for? Per my search on internal documents, it says that more channels are added to support following communications: - Between Hypervisor software and CPUCP firmware - Between TZ software and CPUCP firmware - IPC between CPUCPs (Nord chiplet design) Deepti, Correct me or add anything as needed. Shawn