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[79.144.197.153]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b5e8e1e3bdsm21052951f8f.81.2025.07.17.10.00.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jul 2025 10:00:23 -0700 (PDT) From: Jorge Ramirez X-Google-Original-From: Jorge Ramirez Date: Thu, 17 Jul 2025 19:00:22 +0200 To: Jorge Ramirez Cc: Krzysztof Kozlowski , Bryan O'Donoghue , quic_vgarodia@quicinc.com, quic_dikshita@quicinc.com, krzk+dt@kernel.org, konradybcio@kernel.org, mchehab@kernel.org, andersson@kernel.org, conor+dt@kernel.org, amit.kucheria@oss.qualcomm.com, linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 1/7] media: dt-bindings: venus: Add qcm2290 dt schema Message-ID: References: <20250715204749.2189875-1-jorge.ramirez@oss.qualcomm.com> <20250715204749.2189875-2-jorge.ramirez@oss.qualcomm.com> <8a63f517-a443-48e4-9b9c-0c4b362f59f8@linaro.org> <0bb2867a-393b-46f9-ad6f-1aeee5a3a9d4@kernel.org> 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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Proofpoint-GUID: rnsvvUqMW3rTPIF7S1vi-gMTVoRoLj0h X-Proofpoint-ORIG-GUID: rnsvvUqMW3rTPIF7S1vi-gMTVoRoLj0h X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzE3MDE1MCBTYWx0ZWRfXx7VItA9KTpH0 NV0KsB5YT++iVS7E73Mq3gVTtsUqsD5dh4fciNoUJxoH9W3hcH3OtQfg5ZWQ/h86NkqS+yKSspB XU5VSUXVtcb99wQOjg25X949zWNpPoE9yR1rKQ8Pp02zPTUQ42w3jy4WYccmx2EGQ3pnhox1eb8 iDXaowSAOvEDDwAoo8Q2EC43zr94JmkeBLuadByZXXHn4uUKYuu8K+ucB5wI3XyiGqrF+q9hGaW 5gm6CKc4aIrJ3P44FqMMRLu0YjMUMd9QgMc9jKgHCftu7pCZH+1Z4tjTIgZZ4W9nHdEcygGocqZ IWZdvoVHjHVcKLRpwn4+SlfAeuwW2oER5XCLbvd7olWEmZPO1WygeksVlJM8ekY+SFJV3go/Mcu 1a6sGbJwbWQwQX+8QDlJQ9uUzbYr7f9WPnqavOjku6+4g3U24dtmptfIeeEtI/oCO+gcuG5G X-Authority-Analysis: v=2.4 cv=Xc2JzJ55 c=1 sm=1 tr=0 ts=68792c2d cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=Ki5fnJvzvo7yLsyA0quaxQ==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=gEfo2CItAAAA:8 a=EUspDBNiAAAA:8 a=KKAkSRfTAAAA:8 a=COk6AnOGAAAA:8 a=pj_CNGcikdX4u3R1mKcA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 a=sptkURWiP4Gy88Gu7hUp:22 a=cvBusfyB2V15izCimMoJ:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-17_02,2025-07-17_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 priorityscore=1501 adultscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 malwarescore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507170150 On 17/07/25 13:16:31, Jorge Ramirez wrote: > On 17/07/25 08:45:17, Krzysztof Kozlowski wrote: > > On 17/07/2025 08:35, Jorge Ramirez wrote: > > > On 17/07/25 00:22:53, Bryan O'Donoghue wrote: > > >> On 15/07/2025 21:47, Jorge Ramirez-Ortiz wrote: > > >>> Add a schema for the venus video encoder/decoder on the qcm2290. > > >>> > > >>> Signed-off-by: Jorge Ramirez-Ortiz > > >>> Reviewed-by: Krzysztof Kozlowski > > >>> Reviewed-by: Bryan O'Donoghue > > >>> --- > > >>> .../bindings/media/qcom,qcm2290-venus.yaml | 127 ++++++++++++++++++ > > >>> 1 file changed, 127 insertions(+) > > >>> create mode 100644 Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml > > >>> > > >>> diff --git a/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml b/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml > > >>> new file mode 100644 > > >>> index 000000000000..0371f8dd91a3 > > >>> --- /dev/null > > >>> +++ b/Documentation/devicetree/bindings/media/qcom,qcm2290-venus.yaml > > >>> @@ -0,0 +1,127 @@ > > >>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > > >>> +%YAML 1.2 > > >>> +--- > > >>> +$id: http://devicetree.org/schemas/media/qcom,qcm2290-venus.yaml# > > >>> +$schema: http://devicetree.org/meta-schemas/core.yaml# > > >>> + > > >>> +title: Qualcomm QCM2290 Venus video encode and decode accelerators > > >>> + > > >>> +maintainers: > > >>> + - Vikash Garodia > > >> > > >> Shouldn't you be on this list ? If you upstream a file I think you should > > >> list yourself as responsible for its glory or its mess. > > > > > > happy to do it. The MAINTAINER's file covered all the files named > > > > This should be the person(s) interested and caring about this hardware, > > which means: > > 1. Subsystem maintainers: no > > 2. Driver maintainers: usually yes > > 3. Author(s) of new hardware support: usually yes > > perfect, will do > > > > > > schemas/media/*venus* so my understanding was that I shouldn't. > > > > I cannot comment why people decided to go one way or another in other > > code, but it as well could be just incorrect choice thinking only people > > in MAINTAINERS care about hardware. > > > > ... > > > > >>> + > > >>> + memory-region = <&pil_video_mem>; > > >>> + iommus = <&apps_smmu 0x860 0x0>, > > >>> + <&apps_smmu 0x880 0x0>, > > >>> + <&apps_smmu 0x861 0x04>, > > >>> + <&apps_smmu 0x863 0x0>, > > >>> + <&apps_smmu 0x804 0xe0>; > > >> > > >> You're listing five iommus. > > >> > > >> I understand there's some disagreement about whether or not to list all of > > >> the potential use-cases but, TBH I don't think those are good arguments. > > >> > > >> Unless there's some technical prohibition I can't think of listing all five > > >> maxItems:5 .. let's just do that. > > > > > > since the device tree should describe hardware and not policy, and the > > > driver seems to be able to ignore the unused SIDs I think this is the > > > right thing to do. > > > > > > It was never about the driver but about whether you should describe in > > DTS for non-secure world the entries which are secure world. The answer > > in general is that you can and there will be benefits (e.g. sharing DTS > > with secure world implementations). > > all right, sounds good then, thanks Not sure if I’ve shared this before, but following an internal discussion, I think it’s worth highlighting a functional dependency in the current kernel: - the driver only works if the first two IOMMUs in the list — the non-secure ones — are placed at the beginning. Reordering them breaks functionality, which introduces unexpected fragility. Regardless, this seems like a valid concern to me — a driver shouldn't rely on the order of phandles — and I just wanted to make sure you're aware of it before I post a v8 (likely sometime next week or the following, as I’ll be taking a short break soon). Do you consider this serious enough to be called out in the commit message, or is this kind of behavior accepted as-is - ie, do you know if the DT binding for iommus rely on the order?