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Wed, 26 Aug 2026 03:25:16 -0700 (PDT) X-Received: by 2002:ac8:5d14:0:b0:51c:10e9:ec47 with SMTP id d75a77b69052e-52e42446072mr39441781cf.5.1787739916424; Wed, 26 Aug 2026 03:25:16 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a5de8b5e5esm3137249a12.4.2026.08.26.03.25.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 03:25:15 -0700 (PDT) Message-ID: Date: Wed, 26 Aug 2026 12:25:12 +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 2/2] arm64: dts: qcom: qcs6490-rubikpi3: Add IMX219 camera overlays To: Hongyang Zhao Cc: Frank.Li@nxp.com, andersson@kernel.org, bryan.odonoghue@linaro.org, conor+dt@kernel.org, devicetree@vger.kernel.org, festevam@gmail.com, imx@lists.linux.dev, kernel@pengutronix.de, konradybcio@kernel.org, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, robh@kernel.org, rosh@debian.org, s.hauer@pengutronix.de References: <1ef41a49-dcf8-4252-acdd-f7f3c1210c55@oss.qualcomm.com> <20260825111300.578054-1-hongyang.zhao@thundersoft.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260825111300.578054-1-hongyang.zhao@thundersoft.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: O9_EsRoO9AsCIFKJL09R4U_GR5RDsoUt X-Proofpoint-Spam-Info: AW1haW4tMjYwODI2MDA4NiBTYWx0ZWRfX1FTQdaxEJ4gh mZas58PUr5mi4vFG0Z7RrE3sm3zSxMuP/NR+MIDK2z+R2jXNjGI6O51EKHmktwN9+AG8Xht1D3H gLnj+978i2eC/j2dORKN9R1Lh7bSjR4= X-Proofpoint-GUID: O9_EsRoO9AsCIFKJL09R4U_GR5RDsoUt X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI2MDA4NiBTYWx0ZWRfXycpW4+s1UAEY 3Q78P3cd8+lKGqHEU7482DhBtUFfNZ5k2sU7q9JARTpqep3KPXHQNk/GoiIJFYEvFwIc4ICjeAu h9lkOaLG37NaEUgxQg9q/SELr5non2Q5yKCBEiK+jXfohuoEjiLC0ECpdYB8CztJTfKzY+Bgthx /yyN6N3m+3HsDQgfTEoVwPihMzuc3+fjC5rxphguDD4mr+tHFfvs5y12G0nmGU0ch4DVNo83Cyj jfBcP+9gXx1vPa1GCyec1tCkoFbPGyTdGKpfEUgEGn92XX9gDuKyW1GLjJdfS7bH7oFw8nQcSEG gFb+TfbPa8aKLLch8AQd9TqlEd4cI4rdWizxaVL7zCsmTpR3kj3vOf4AF/kT0LuhUAcutyfMMXa z+keWrl5dc49ImJmsjBWIY18Pl5zLiLRg/QUuObOHK9xlFFue0A6ImG6OhG99LpG6ueKNH6mNFX ZbEZV3KAvtxGJed7T8Q== X-Authority-Analysis: v=2.4 cv=PPQ/P/qC c=1 sm=1 tr=0 ts=6a8ebf0d cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=RF00TdSWAAAA:8 a=CXY4OXtTAAAA:8 a=EUspDBNiAAAA:8 a=TEp5gEa_GWzzUIBBXKoA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 a=_nx8FpPT0le-2JWwMI5O:22 a=-bjYFdKVujGyJWVmPOR4:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-26_03,2026-08-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 impostorscore=0 spamscore=0 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608260086 On 8/25/26 1:13 PM, Hongyang Zhao wrote: > Hi Konrad, > > Thanks for the review. [...] >> No reset GPIOs? > > Yes. The RubikPi camera connector does not route a dedicated sensor reset > signal. It exposes PWR_EN and CAMERA_GPIO, but neither is connected > directly to the IMX219 reset input when using the official Raspberry Pi > Camera Module 2. > > PWR_EN is connected to the module's ENABLE signal and controls the > module-local power supplies. CAMERA_GPIO corresponds to a pin that is > not connected on Camera Module 2. The IMX219 /PWDN signal remains local > to the camera module and is tied to its 1.8 V rail. > > Therefore, there is no board-controllable reset GPIO to describe for > this camera configuration. > >> >> You should also have a reference to the mclk pin state to make sure >> the correct pin function kicks in > > The Camera Module 2 provides its own 24 MHz oscillator, which is > connected to the IMX219 MCLK input on the module. RubikPi does not route > a SoC CAM_MCLK signal to this connector. The fixed-clock node represents > that module-local oscillator, so there is no corresponding TLMM MCLK > pin state. > > The Camera Module 2 schematic shows both connections: > https://datasheets.raspberrypi.com/camera/camera-module-2-schematics.pdf > > RUBIK Pi 3 schematic (CSI connector, page 13): > https://thundercomm.s3-accelerate.amazonaws.com/uploads/web/rubik-pi-3/RUBIKPI3-IOB-V02-RELEASE.pdf Got it, thanks for the explanation Reviewed-by: Konrad Dybcio Konrad