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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2be2c357d6bsm788690eec.20.2026.03.03.15.24.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Mar 2026 15:24:17 -0800 (PST) Message-ID: Date: Tue, 3 Mar 2026 15:24:16 -0800 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/2] dt-bindings: phy: qcom: Add CSI2 C-PHY/DPHY schema To: Dmitry Baryshkov Cc: Bryan O'Donoghue , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Bryan O'Donoghue , Vladimir Zapolskiy , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260226-x1e-csi2-phy-v3-0-11e608759410@linaro.org> <20260226-x1e-csi2-phy-v3-1-11e608759410@linaro.org> Content-Language: en-US From: Vijay Kumar Tumati In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=Pv2ergM3 c=1 sm=1 tr=0 ts=69a76da2 cx=c_pps a=PfFC4Oe2JQzmKTvty2cRDw==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=h69VVFRyML4NUzg0ml0A:9 a=QEXdDO2ut3YA:10 a=6Ab_bkdmUrQuMsNx7PHu:22 X-Proofpoint-ORIG-GUID: W3vJOx_vspUcau3JpPSPlXEff__GCn6v X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAzMDE5MiBTYWx0ZWRfX6tZuqsd+nmMa xnMKJLiLDo6VXsTwKRKTMZTTJQ3p4PJ60WAEb/I7zxY/p3QzLzWkxQAbsgp9oSPC+sfUQd+8q3b 7Bdqg/4g5+C5kJ5aO8gqgs+YLdVKUfoCt7SkQsJ0NRrmdyf0VpPO3bA6LjQybLPIzothO5Ecvkd sT9jWPG1JIl3Fwc99LIzDsmKetWKSEnluLPTkYIgBRFiHNjtfKJmPmB5Iv1sJsRb3WprJOKLkrO kTYWrP8frtg1bqGPu3dSyBTgYVYq0ixpWYVnuIMoxcS7e9b4FtAPhzF1xqTP/oyeXJb7+fH86/M apxNMtI/lFBcbvRJ/gGyva+Tm4B4AdhKNfPxPoXGqZ4bKsvE0+TMwRuk3gbGLVoniEhHJj6lzuK vueBXy5Lrr/2lMdGWbkV9PmFiGrMAtsgzx3ATZUAZUz3V1Z/nDTytJR6rmtbRXG4nyi9gGoyxU2 xNXAC96Yt/nEoagnTSQ== X-Proofpoint-GUID: W3vJOx_vspUcau3JpPSPlXEff__GCn6v X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-03_03,2026-03-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 malwarescore=0 spamscore=0 suspectscore=0 adultscore=0 priorityscore=1501 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603030192 On 3/3/2026 2:31 PM, Dmitry Baryshkov wrote: > On Mon, Mar 02, 2026 at 05:51:24PM -0800, Vijay Kumar Tumati wrote: >> Hi Bryan, >> >> On 2/26/2026 4:34 AM, Bryan O'Donoghue wrote: >>> + power-domains = <&camcc CAM_CC_TITAN_TOP_GDSC>; >> As we are cleaning up the PHY device nodes, we should consider fixing the >> power domains as well. Although TOP GDSC is defined as a power domain, it is >> not the power source for the PHY devices. Rather, it is the MMCX, MXC and >> optionally MXA based on the architecture (Refer to 'Voltage rail' column for >> PHY clocks in IPCAT). There is no >> parent-child relationship between the TOP GDSC and these in the clock driver >> and it was just working as the required power rails are getting enabled >> by/for other MM devices. > > Which domains are required to access CSI PHY registers? PHY register access requires the PHY core clock, cam_top_ahb clock. So in my understanding, we need to trace these clocks in the topology backwards up until at least the RCG, and all the voltage rails powering these clocks will be the required power domains. Having said that, just register access works even if the voltage rails are configured to the min level, which camcc does already. > >>> + >>> + vdda-0p8-supply = <&vreg_l2c_0p8>; >>> + vdda-1p2-supply = <&vreg_l1c_1p2>; >>> + }; >>> + > Thanks, Vijay.