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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-639f4106c60sm2302930a12.43.2025.10.09.05.36.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Oct 2025 05:36:59 -0700 (PDT) Message-ID: <3166b396-7aa8-47d7-8d44-e7d88f920c15@oss.qualcomm.com> Date: Thu, 9 Oct 2025 14:36:56 +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 v3 0/5] Introduce "non-pixel" sub node within iris video node To: Charan Teja Kalla , Krzysztof Kozlowski , Bryan O'Donoghue , Bryan O'Donoghue , Bryan O'Donoghue , Dmitry Baryshkov Cc: Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <7b6db4fa-2f73-376d-4eb3-64c1c7e6cda3@quicinc.com> <6840d462-8269-4359-a6e5-d154842b62db@oss.qualcomm.com> <2hh3zkdwgqbdurpr4tibr3gjat6arwl3dd3gxakdaagafwjdrm@aj5em4tbsjen> <4a32bbec-2baf-4210-a7c1-1ddcd45d30c8@oss.qualcomm.com> <4d87d1ca-55b2-426e-aa73-e3fd8c6fe7bd@kernel.org> <10a8ccda-4e27-4b06-9a0e-608d6ade5354@nxsw.ie> <4cb4a92d-2f20-47c7-881e-aadcc6f83aa0@kernel.org> <1516f21e-aee3-42cf-b75e-61142dc9578d@oss.qualcomm.com> <9bae595a-597e-46e6-8eb2-44424fe21db6@linaro.org> <6ead45a6-aac8-464d-9812-f5e0d1395709@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <6ead45a6-aac8-464d-9812-f5e0d1395709@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDA4MDEyMiBTYWx0ZWRfX86G6Pl/biEey eySVIm8jfKl7rwLmXU2ot2LalDITkFxysCGjndyXF24q29b5TKCQug3PXxd0hRmVCBReIM8MNX8 K8sNysPOoAtS0+RK3QDQEoLSzeIwUQ2sojmGidpvbnuP+xNQOh1YuJAEggcbvEihmc17RxteKxV gzJYLl+3D0ERHXti0rKpb5RRyniigZng+gfkzC3Jjgb7wMT/GQ/3+u52Hv4Wo2Kpe8fQbMvz68e NV3RnIhR8T9OI1ThVpED6XwjbnHYtszTETAapISB6h9OuU72nY0VhOPNdgPD0XLv26UPVBEwKDF fIDXOLQtOmkwrUmCsHsSMj7cZVoJVTjFEOaOjbckhFwqaeVeuX6Xm5mOHBo+vDVYTf2c625QHYb 1ufCnKX7diurDyr54hkRe3zOJSPjPQ== X-Proofpoint-GUID: XUNqe25tvadxzPj3FNfe26CBNjeiCQbx X-Proofpoint-ORIG-GUID: XUNqe25tvadxzPj3FNfe26CBNjeiCQbx X-Authority-Analysis: v=2.4 cv=JPk2csKb c=1 sm=1 tr=0 ts=68e7ac6e cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=goJB-IjUJ7mqbQYCmycA:9 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-09_04,2025-10-06_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 spamscore=0 clxscore=1015 impostorscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 adultscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510080122 On 10/9/25 7:23 AM, Charan Teja Kalla wrote: > > > On 10/9/2025 6:02 AM, Krzysztof Kozlowski wrote: >>> If it is legitimate meta-data for the SMMU setup then why _shouldn't_ it >>> go into the DT ? >>> >> We talked about this two or three months ago. I don't understand why you >> just ignored that entire part and come with new binding just to not >> touch iommu code. List of entries in iommu must have strict order, just >> like for every other list, and you should rely on that. > Hi Krzysztof, > > I want to understand a bit more about the statement -- "List of entries > in iommu must have strict order." > > per my understanding: > iommus = <&apps_smmu sid1 mask1>, <&apps_smmu sid2 mask2>; > > and > > iommus = <&apps_smmu sid2 mask2>, <&apps_smmu sid1 mask1>; > > The end result is same with no breakage as they still end up in using > the same translation unit, i.e., ordering doesn't matter. > > May be you imply something else(may be ABI[1]) here about the order, > which I am unable to catch... Krzysztof is referring to the 'items:' blocks in dt-bindings always containing an ordered list of entries (i.e. the examples you gave are NOT identical from the bindings perspective even if Linux happens to treat them in the same way as of right now) Konrad