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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-847a03cd5c2sm1384983b3a.61.2026.06.30.01.01.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Jun 2026 01:01:35 -0700 (PDT) Message-ID: <33ee63e5-c1df-47b6-bde1-4fe6b037878a@oss.qualcomm.com> Date: Tue, 30 Jun 2026 16:01:17 +0800 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 0/7] Provide support for Trigger Generation Unit To: Suzuki K Poulose , Greg KH , Jie Gan Cc: andersson@kernel.org, alexander.shishkin@linux.intel.com, mike.leach@linaro.org, konrad.dybcio@oss.qualcomm.com, james.clark@arm.com, krzk+dt@kernel.org, conor+dt@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org, devicetree@vger.kernel.org References: <20260417073336.2712426-1-songwei.chai@oss.qualcomm.com> <48c6abce-c492-46a6-84ef-3074983e817c@oss.qualcomm.com> <2026062959-distaste-launder-e253@gregkh> Content-Language: en-US From: "Songwei.Chai" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: 5Ked3UxVzQA5QNQmh8aEmvITS6u_gS8I X-Authority-Analysis: v=2.4 cv=AtDeGu9P c=1 sm=1 tr=0 ts=6a4377e1 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=fWFuU9I0zHhLgkhYlfEA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-ORIG-GUID: 5Ked3UxVzQA5QNQmh8aEmvITS6u_gS8I X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjMwMDA2OSBTYWx0ZWRfX88VefwnHNtXX XWLxZcjNF0x61mfQq93MT9/Hcb6Xu/Ka/FZsprjr5ozaKsFeUCFLrUPwa2Rd/3RZucUSe9DOfKJ 9SsiNVfEuKHBTEswMGUra8QpoBmVcd3JXdaPViOFK8pmZK9DGAcQhwCel6nqAhR9eJyejd7Gkej jx+sglHsOM5CKN2veMYhxOIzE/lHJ7iv2SyHCgemXSWsE8WmnubcmsZ7HgCfWmlXY8Zw1Fj2ejC w9WwxLLM/RupwLLz0bXdJ50THsy/xPdY9oVJIlXabikTt246CSXdVvLpTiC2ExLYTHsAdbI6B9U +B9h+rtIdJONE6m72WFtqDINkHqgpNNIMWXWaBNgFsGjidFW57ZDauI9ESMLy6jedUjwJ2OrrDj iCR67VkILWZc6B3l1ODiCOunuumDiPIbjb2PBdb6w8mp3HJij7qmuSNrnJuWzWR7w7tpI6wboIe frN7UtfgoWAZND6yN6Q== X-Proofpoint-Spam-Info: AW1haW4tMjYwNjMwMDA2OSBTYWx0ZWRfXwDSwt+d6oVdZ J4iV35vy7qREhHgJL87hzjc4lKxomW7jO/9dnzDuszr8UCrd4yyltooxvl3qd8+7VQklx7ipU9i eIwc2WQE1AvDV7mLzvSWdTiGraThogM= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-30_02,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 phishscore=0 bulkscore=0 impostorscore=0 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606300069 On 6/29/2026 6:44 PM, Suzuki K Poulose wrote: > Hello, > > On 29/06/2026 11:17, Songwei.Chai wrote: >> >> On 6/29/2026 12:22 PM, Greg KH wrote: >>> On Mon, Jun 29, 2026 at 11:03:33AM +0800, Songwei.Chai wrote: >>>> Hi Greg & Alexander, >>>> >>>> Apologies for interrupting again. >>>> >>>> As the TGU hardware plays an important role in Qualcomm tracing >>>> design, I >>>> would greatly appreciate it if you could kindly take some time to >>>> review >>>> this at your earliest convenience. >>> The merge window _just_ closed, please give us a chance to catch up. >>> >>> Also, why us?  Surely you have other reviewers for this code, right? >> >> Hi Greg, >> >> Understood, thanks for letting us know. >> >> Regarding your question: since this introduces a new >> drivers/hwtracing/ qcom directory, there is no existing maintainer >> for it. >> Given your scope (and Alexander's), we believe you are the most >> relevant reviewers. >> >> The reason for creating the qcom directory is as follows: >> >> /We previously tried to upstream this driver under drivers/hwtracing/ >> coresight,/ >> /but it was not accepted as it is considered Qualcomm-specific and >> not tightly/ >> /coupled with the CoreSight subsystem. Based on this feedback, we are > > Some clarification here: This device is not CoreSight  so we denied > keeping this under drivers/hwtracing/coresight/ - Not because it is > Qualcomm specific. We have TPDM, TPDA, TnoC devices under the coresight > subsystem, which are all Qualcomm specific for e.g. > > That said, there are other drivers in drivers/hwtracing/ which I usually > merge and push to Greg, after some reviews/acks from the respective > people (e.g., PTT HiSilicon PCIe Tune and Trace). > > But, your proposal was that there were other maintainers for your new > subtree and you were going to push this via ,linux-arm-msm ? to which I > didn't have any objections. > > That said, I am fine with pushing this to Greg via the CoreSight pull > requests (similar to Hisilicon PTT driver), but would need someone to > Maintain/Review the driver (with entries in MAINTAINERS, similar to > PTT). > > > Thoughts ? Hi Suzuki, Thank you for your constructive feedback in helping us move this patch forward. As the owner of this driver, together with Jie Gan (who has extensive review experience), we will be responsible for the maintenance and review going forward. The MAINTAINERS update will be included in the next TGU release. Feel free to share any additional comments. Thanks, Songwei > > Kind regards > Suzuki > > > >> exploring/ >> /a dedicated drivers/hwtracing/qcom directory, similar to intel_th, >> to better/ >> /support this and future Qualcomm hwtracing drivers./ >> >> More details can be found in “[PATCH v14 0/7] -- Why we are proposing >> this”. >> >> Thanks, >> Songwei >> >>> >>> thanks, >>> >>> greg k-h >