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Thu, 21 Aug 2025 06:53:29 -0700 (PDT) From: Neil Armstrong Date: Thu, 21 Aug 2025 15:53:26 +0200 Subject: [PATCH RFC 1/3] dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy: Document default phy mode Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250821-topic-x1e80100-hdmi-v1-1-f14ad9430e88@linaro.org> References: <20250821-topic-x1e80100-hdmi-v1-0-f14ad9430e88@linaro.org> In-Reply-To: <20250821-topic-x1e80100-hdmi-v1-0-f14ad9430e88@linaro.org> To: Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Neil Armstrong X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1974; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=Aq4B8ubCvdna8UpVPGeOGxwN0aFnE91nXSAPqGRX4oM=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBopyTXldbpm4aBJ2CsjXkwQ24ndf393shGxX332QEv OXcBGm6JAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCaKck1wAKCRB33NvayMhJ0cV9D/ 9Ki7JcUNOAeH+4OzoHkHUP+vqAWxGIqz0PI1mKTURjsY+W1XGqbumr63HVm10/uPe+ctdQpVLJcfuf P7Zlp2uzHtdNuvdNHUFWiFP2jIOxEK1HkwmTMmw04jj7RMUxj3Wd9+cf4pJJ+1DFLxkM/wCkuIU0lR MMhrQWmsHBgI6On5U/7nYJr5EMepeTV8P3nyWYklErdKvijuWm1GRgjNnl57Ff6gNMu+2tmn7Cz5Ct 8oJjm9W7Tx99PeMsMx2ypyWeLqMpRmOTpxSRN5WerUHcl0OJ3CNkuapZ3JLT8IgF4rU2KTKCE0Z36+ CDoahhIPvFO17Tz7Zy7jk6vqQMXHNi7SJKyFST/kGfgtfuM/9SNI698IsBScm+pLMxvtPCSB1FUqQY oon8yBV31VcPp1385R5sJHfckSgYKihZDz1iAKFMbVvtKFNEEwqgGF8WJR4/VXBbmVaKi+Dif9hFEP 2bB2O/nFsHUGhu8EEv3ghfexcSnnYKoH3Wydbwal/eXBmPuN1Kh8GPY4knHmqO8MrbbwXfyIgEOvsq nDIXQLPzsOzvQHY6XRmSL8bb5NRdxqYBT0dVa/VXLHVW5WsJPHPAArX5opq+p6a/vYUQ9e+y0zRT4S WDm4iqLuQx9488Xz1o0C46fbw0xJYmU7qt4CgLdUy/BaJHDfyvp1krYTiS9w== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE The QMP USB3/DP Combo PHY hosts an USB3 phy and a DP PHY on top of a combo glue to route either lanes to the 4 shared physical lanes. The routing of the lanes can be: - 2 DP + 2 USB3 - 4 DP - 2 USB3 And the layout of the lanes can be swpped depending of an eventual USB-C connector orientation. Nevertheless those QMP Comby PHY can be statically used to drive a DisplayPort connector, DP->HDMI bridge, USB3 A Connector... But if a 4lanes DP->HDMI bridge is directly connected to the QMP Comby PHY lanes, in the default routing 2 or the 4 lanes would probbaly be USB3, making the DP->HDMI bridge non functional. Add a property to hint in which layout mode the QMP Comby PHY should be as startup. Signed-off-by: Neil Armstrong --- .../bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml | 13 +++++++++= ++++ 1 file changed, 13 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43d= p-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43d= p-phy.yaml index c8bc512df08b5694c8599f475de78679a4438449..129475a1d9527733e43ded5a38a= ad766f9810fe7 100644 --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.y= aml +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.y= aml @@ -76,6 +76,19 @@ properties: mode-switch: true orientation-switch: true =20 + qcom,combo-initial-mode: + description: + Describe the initial mode of the Combo PHY configuration. + The Combo PHY is a wrapper on top of a DP PHY and an USB3 PHY, + sharing the same SuperSpeed lanes with either DisplayPort over + the 4 lanes (dp), USB3 on a pair of lanes (usb3) or both + technologies in a 2+2 configuration (usb3+dp) as default. + default: usb3+dp + enum: + - usb3+dp + - usb3 + - dp + ports: $ref: /schemas/graph.yaml#/properties/ports properties: --=20 2.34.1