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Thu, 09 Jul 2026 11:16:25 -0700 (PDT) X-Received: by 2002:a05:620a:8813:b0:92b:55d5:ba3 with SMTP id af79cd13be357-92ed764b013mr444076185a.0.1783620985462; Thu, 09 Jul 2026 11:16:25 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c15db22ed68sm233609766b.35.2026.07.09.11.16.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 11:16:24 -0700 (PDT) Message-ID: <29bbcc9d-a0b5-4966-a195-1702ed514a4a@oss.qualcomm.com> Date: Thu, 9 Jul 2026 20:16:21 +0200 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: [PATCH v4 0/5] Add Qualcomm JPEG V4L2 encoder for SM8250 To: Dmitry Baryshkov , Bryan O'Donoghue Cc: 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: <437d1eb0-4495-406a-9501-b0515cfa3151@linaro.org> <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> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDE3OSBTYWx0ZWRfX35yLEagBGQQ5 qtlB7/ihFrN9HdHzZNVyAmD80ce6QZvgM/9bk+H/Bo7SEdylrDP4n46wULVin1UHcKF7wNwSEo6 7TdsdcAfOjmSH16umxfIRi1z3C5bLqAY1My0tveZwelKvpD3c/AYnFQ6W8Y3Ob2MkshK2Ei9mEU 0RHdfM+JXrn/GACPShv31sAG7G24nxAxJd95ofhHlUYrLZrtca0aZtaMRsASZptdQ9tMu1e0mDZ NnrPyeoXt398Djxis28P8Z3SP02POgtBqWuxoFy9vYcXxvdoB+RAT3U/kDygWrQzG+LjozAG/vy CExSiV1SsrHaVBn0LOrsCtJVBb6SF7/PDqcG/gU1hl8SjVDwrxD+QqSkyjyhqEZe+C4Lg26kV4x 8vfw8xgl4qrHIPHCtBEY1IsAGTrB+9T/Z6PjfJF3ACmdGu2D/kFHDETg/7XvFI5eMULkihH63+S kLCvvZ10N4urDMoPw2g== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDE3OSBTYWx0ZWRfX/BcZo4QKkR8L XWYUDzqESB9JKYvA1Ah93vhO7VgbYpm54a8LEvnXrk08MK8xqNgG0iW04MCMSS6qzhtgvNGC2Ii 1iVFe4g0Xu3D3CCCfi/emV/Pnj21Zio= X-Proofpoint-GUID: GUmt4ijQlRLPoURUDLH6pcl-jj4ErGSB X-Proofpoint-ORIG-GUID: GUmt4ijQlRLPoURUDLH6pcl-jj4ErGSB X-Authority-Analysis: v=2.4 cv=GJ441ONK c=1 sm=1 tr=0 ts=6a4fe57a cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=02blghMF5h8Ooo6bNK0A:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 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=2026-07-09_04,2026-07-09_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 suspectscore=0 spamscore=0 phishscore=0 adultscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607090179 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: >>> [...] >>> >>>> OK, I can see how this thread is confusing. >>>> >>>> The idea is to start to declare sub-nodes "on the road" to making camss into a bus. The legacy binding we have is really for the IFE domain - that is CSIPHY, CSID, IFE. >>>> >>>> Right now the camss binding describes those things - so linking say OPE or JPEG back to the thing that describes those isn't right. >>>> >>>> OTOH we_want_ to make the top-level binding into a bus, we've discussed that several times. >>>> >>>> To transition from monolith IFE-domain only, to camss-bus, we should have the sub-nodes fully describe themselves as "camss-bus" doesn't exist yet. >>>> >>>> Once we have compat="camss-bus" then fine, make that linkage, I fully support that. >>>> >>>> That roadmap BTW is why I'm asking Antanas and Loic to make JPEG and OPE sub-nodes of camss - but make them complete sub-nodes - power-domains, clocks, nocs, including the TOP_GDSC. >>> I think this needlessly increases the amount of combinations we'll >>> have to keep supporting down the line (with a ton of compatibility >>> boilerplate code) >>> >>> Konrad >> >> Fine. >> >> Lets drop the bus idea then. I'm happy to close the conversation as >> peer-nodes. > > It think, this would close the path for upgrading existing platforms to > split the driver / bindings. If all IFE / PHY / etc. are subnodes of the > CAMSS, it is easy to play backwards compatibility tricks and > reinstantiate devices on the fly, pick up only certain resources, etc. > > If they are sibling nodes, it becomes much more complicated. > > I might be wrong here. Maybe we really should try a simple (heh) > experiment. We have your series which adds CSI PHY as a first class > citizen. And we have existing platforms where CSI PHYs were packed into > the camss node (and camss driver FWIW). > > 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. This is not to blame any of the original implementers, this might have seemed like the right idea for the tiny subsystem on msm8916. Konrad