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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-kernel@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-Proofpoint-GUID: SfqBikWCjB7iZ7SBX4RY-zptabvesiJn X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAzMDE5MiBTYWx0ZWRfXxGnlBerNDlIl z8S8wN3t6TzwDDMlB5h7odN+C9+uDB4y+mpyZKicwn6MbWzPX9K6J4+RCjjijX3hq+dkSs0ZNPH PUVEYXouuJGxIrd5Y0WkswFslRmnyCmQi0MLs9ugV0O0ecsOggzz9dtr/ZeaRivk0ifGBcNgLoI ue4TLRdHDQKppQM2k1KUIQQsg2hBY8wr3oJMx9sEkSk1XR7aYOSj3AyCqAz7lAZBxAK83shiv1b YA5EmMKkA7ORhz4JcRupdrH6JhUn8DXcAQc/8CToC6YkHcgso+nPX5DlkoO53H0UkvMoa5JJWd8 XF1Rc4TtADdEYproi5ojeTI1+v23cnAEPBJlKRXbFvFT0gYkKuRyLQsYbbVzmtGLQbS6jZ1/+b1 xP2tDU4AgmmobF3yS+CCXllUCCLvTQU0lKyT5zhm6FkKmW28zHMqHYzzpcyDRU3DUNaNnaQqGHl KoKmmzmclAWI7iw1fVg== X-Proofpoint-ORIG-GUID: SfqBikWCjB7iZ7SBX4RY-zptabvesiJn X-Authority-Analysis: v=2.4 cv=BpWQAIX5 c=1 sm=1 tr=0 ts=69a76da2 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=h69VVFRyML4NUzg0ml0A:9 a=QEXdDO2ut3YA:10 a=PxkB5W3o20Ba91AHUih5:22 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 suspectscore=0 bulkscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 phishscore=0 spamscore=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.