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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9b203c2288sm225074866b.40.2026.03.27.03.07.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 27 Mar 2026 03:07:05 -0700 (PDT) Message-ID: <7712fbdd-a225-49f0-aeb9-ebcbb9d5abac@oss.qualcomm.com> Date: Fri, 27 Mar 2026 11:07:02 +0100 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 v5 1/2] dt-bindings: phy: qcom: Add CSI2 C-PHY/DPHY schema To: Bryan O'Donoghue , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong Cc: 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: <20260326-x1e-csi2-phy-v5-0-0c0fc7f5c01b@linaro.org> <20260326-x1e-csi2-phy-v5-1-0c0fc7f5c01b@linaro.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260326-x1e-csi2-phy-v5-1-0c0fc7f5c01b@linaro.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI3MDA3NCBTYWx0ZWRfXxPo0le4zsMAB RtD2it4sYZdnTqaVtN0RXBSu1BBJcYLb0jLE7xm9Vr14qndgVv5SfZTSTzryd+OrySo56t7NG+V xPS+2F/s19RLy3oBeGNdHS1xiEIQ2wXhFTEMEZKjpmTMkYnntXSSZSKpq3vEvDsJNCTtT9Sw4tH cboH9ThkbwzdQBjgQvUXLqAKrJqoYDb3Bqi4iX5exCiK5GKs0/4vMYgMtIuYBJZ2Zcb6qxLVa+2 pyq77tDvOJtI1Nk+56WlhIebfldsgitxYUwadfqr38h+11/EkHwuDY6x1vjFOyTMwHsMEIW34HJ KdRAzPnfUC/OJB/EaCyfd5Pl1QUuwO5UUIkMUVvQYYz2V8wG0MFbiHPRMvrA+t0ia/1hrv8IjL0 yY1l2xXdz6jSb5w2OHwSIIaOuvV0QaoWykiwU09WgC+ILxOdHNWNtXQu8BLTlJl6G6UPmmrjpXS aPqzxYEAo11EVxVV7mw== X-Proofpoint-GUID: UVnh0ExG0ycALLm2Kqk6u5TyWaSZWXPC X-Proofpoint-ORIG-GUID: UVnh0ExG0ycALLm2Kqk6u5TyWaSZWXPC X-Authority-Analysis: v=2.4 cv=JaCxbEKV c=1 sm=1 tr=0 ts=69c656cb cx=c_pps a=oc9J++0uMp73DTRD5QyR2A==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=0SmWYRu_8F9rFwqJbSoA:9 a=QEXdDO2ut3YA:10 a=iYH6xdkBrDN1Jqds4HTS:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-26_04,2026-03-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 phishscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 impostorscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603270074 On 3/26/26 2:04 AM, Bryan O'Donoghue wrote: > Add a base schema initially compatible with x1e80100 to describe MIPI CSI2 > PHY devices. > > The hardware can support both CPHY, DPHY and a special split-mode DPHY. We > capture those modes as: > > - PHY_QCOM_CSI2_MODE_DPHY > - PHY_QCOM_CSI2_MODE_CPHY > - PHY_QCOM_CSI2_MODE_SPLIT_DPHY Does the _PHY_ DT node need to be aware about this upfront? If we have some sideband signal (e.g. the sensor driver specifically requesting C-PHY mode), we can simply throw all this complexity into phy_mode + phy_configure_opts, all at runtime Further, the combo/split mode may possibly be selected through aggregation of requests. The question remains whether the sensor should have a direct connection to the PHY itself (i.e. phys = <&csiphyN> or of_graph straight into the PHY) or whether it's going to be translated by the camss node (which would be the one holding a PHY reference) - there's probably surface for adding such negotiation logic in both places Note this is a question and I'm not aware of all the possible combinations Konrad