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Fri, 10 Jul 2026 05:33:58 -0700 (PDT) X-Received: by 2002:a05:6214:4907:b0:8ef:4749:b1c9 with SMTP id 6a1803df08f44-8ff957351eamr82840646d6.5.1783686838278; Fri, 10 Jul 2026 05:33:58 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-69a19ce4b4fsm10705561a12.10.2026.07.10.05.33.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jul 2026 05:33:56 -0700 (PDT) Message-ID: <1921023f-da03-4f3d-8489-bfa2c5fe4f3b@oss.qualcomm.com> Date: Fri, 10 Jul 2026 14:33:53 +0200 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/5] Add Qualcomm JPEG V4L2 encoder for SM8250 To: Dmitry Baryshkov Cc: Bryan O'Donoghue , Vladimir Zapolskiy , Atanas Filipov , linux-media@vger.kernel.org, loic.poulain@oss.qualcomm.com, mchehab@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andersson@kernel.org, konradybcio@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <8116c54e-4050-4e9d-b236-59d74846bd57@linaro.org> <8a09875d-af5f-438b-b947-bc2b61219b70@oss.qualcomm.com> <8fc1ddfd-0f77-4b67-b9bd-33fbd60e2046@oss.qualcomm.com> <54ad9b8a-7596-4bc7-a1c3-7230cca21360@kernel.org> <29bbcc9d-a0b5-4966-a195-1702ed514a4a@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzEwMDEyNSBTYWx0ZWRfX4N1FN5N0YMZf ljTe+b33zXn+q0jZBT2K0+Nh7cA3UzsjUddaGq/+sKpH6vV8ffJo1N73nI82dKg8iUy7Sn51vL+ ZhF3ZnjwIA9i4VdkeYATFHZiQhIioKI= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzEwMDEyNSBTYWx0ZWRfXyggx+aBVnf6k TTkUhAPW94GbEt/zL3UhskDLKsa8mYK9DXw5SpRYyiBSMScENyj05Zcokzsvsd6du+LFWeWbtOs R6K0auAc3DXTKkY9Y86CsuUw7aANkH4IyWQvj5s1pWo7Z+9W52xRKH/OkQu8Tdgs7/XWRy3Wh6w +fInknyGW5KNvn86et88XeqPC21r//7TKu9H49G5DnSnhMMkx7G9Z+tY7YED8+2CQVfR/LWP1Ez kVnt6H1oAZxcuYa/e60BfN2URFdqOiY1jzdMaTcNpjGA37cqh2WWnnTuo33UOJ2ZZzHli1bPi6R RQNZOGC7jo6jLWx77Pm3lAMyEP8jl/rurJtXevw4ESS4ohj/f21CMHrV7h6XXBs5zmMlqAzD/+E F6NiYhIFnUJ7Ck0HGs3a2Kti+ZkgUHll4mueKVj5tZH+THT+Fh+JbxoA1JncxTsK6V3YQ2KjKmf 0AF8xxveXEj0YXcvAmQ== X-Proofpoint-GUID: vmhQ7vCHNaOxphBRvPlU711sX1VmoeMd X-Authority-Analysis: v=2.4 cv=HqpG3UTS c=1 sm=1 tr=0 ts=6a50e6b7 cx=c_pps a=wEM5vcRIz55oU/E2lInRtA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=dFzIMAVjCySLt-5DOyQA:9 a=QEXdDO2ut3YA:10 a=OIgjcC2v60KrkQgK7BGD:22 X-Proofpoint-ORIG-GUID: vmhQ7vCHNaOxphBRvPlU711sX1VmoeMd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-10_03,2026-07-09_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607100125 On 7/10/26 2:28 PM, Dmitry Baryshkov wrote: > On Thu, Jul 09, 2026 at 08:16:21PM +0200, Konrad Dybcio wrote: >> On 7/9/26 9:33 AM, Dmitry Baryshkov wrote: >>> On Wed, Jul 08, 2026 at 10:21:43PM +0100, Bryan O'Donoghue wrote: >>>> On 08/07/2026 13:19, Konrad Dybcio wrote: >>>>> On 7/7/26 12:41 PM, Bryan O'Donoghue wrote: >>>>>> On 07/07/2026 11:11, Konrad Dybcio wrote: >>>>>>> On 7/7/26 12:00 PM, Bryan O'Donoghue wrote: >>>>>>>> On 07/07/2026 10:24, Konrad Dybcio wrote: >>>>>>>>> On 7/6/26 3:37 PM, Bryan O'Donoghue wrote: >>>>>>>>>> On 06/07/2026 14:02, Vladimir Zapolskiy wrote: [...] >>> Which way of representing device nodes makes it easier to migrate >>> existing platform to the CSI PHY driver, while keeping compatibility >>> with old DTs (yeah, ABI, old DTs must continue to work)? >> >> Quite frankly, I don't consider the existing (meganode) description >> any valid, and would vote to rip it the second a replacement is >> available. But once, not N times. > > Rip without providing backwards compatibility? Because the existing bindings make ensuring the required performance state of power domains impossible, yes > One of the options would be to follow the 'venus/iris' approach: land > new set of component drivers, which target new platforms and provide > minimal support for one old platform (maybe via autoapplied DT overlay > or other similar techniques). Then continue migrating and phasing out > camss driver for old platforms, while adding support for new blocks in > the new set of drivers and ripping support from the camss driver after > some migration time. > >> This is not to blame any of the original implementers, this might >> have seemed like the right idea for the tiny subsystem on msm8916. > > Maybe... Interestingly, there's a number more peirpherals inside the 8916 CAMSS too, I suppose some enthusiasts may poke at that one day, there was quite a sizeable developer base for that SoC at one point. $ rg @ arch/arm64/boot/dts/qcom/msm8916-camera.dtsi 15: qcom,msm-cam@1800000{ 19: qcom,csiphy@1b0ac00 { 41: qcom,csiphy@1b0b000 { 63: qcom,csid@1b08000 { 87: qcom,csid@1b08400 { 111: qcom,ispif@1b0a000 { 155: qcom,vfe@1b10000 { 212: qcom,jpeg@1b1c000 { 232: qcom,irqrouter@1b00000 { 239: qcom,cpp@1b04000 { 273: cci: qcom,cci@1b0c000 { (there's probably more hidden in magic reg accesses) Konrad