Linux-PHY Archive on lore.kernel.org

* [PATCH v11 1/2] dt-bindings: phy: qcom: Add CSI2 C-PHY/DPHY schema
From: Bryan O'Donoghue @ 2026-07-19 12:29 UTC (permalink / raw)
  To: Vinod Koul, Kishon Vijay Abraham I, Rob Herring,
	Krzysztof Kozlowski, Conor Dooley, Neil Armstrong
  Cc: Bryan O'Donoghue, Vladimir Zapolskiy, linux-arm-msm,
	linux-phy, linux-media, devicetree, linux-kernel,
	Bryan O'Donoghue, Krzysztof Kozlowski
In-Reply-To: <20260719-x1e-csi2-phy-v11-0-9d0a1ed0632d@linaro.org>

Add a base schema for the MIPI CSI2 PHYs on Qualcomm SoCs. This PHY
supports both DPHY and CPHY operation. A special mode of DPHY operation -
called variously split-mode or combo-mode also allows for two sensors to be
connected to one PHY.

The submitted binding here describes the DPHY modes of operation only. CPHY
is left to future work.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 .../bindings/phy/qcom,x1e80100-csi2-phy.yaml       | 195 +++++++++++++++++++++
 1 file changed, 195 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,x1e80100-csi2-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,x1e80100-csi2-phy.yaml
new file mode 100644
index 0000000000000..880fe602945cb
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/qcom,x1e80100-csi2-phy.yaml
@@ -0,0 +1,195 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/qcom,x1e80100-csi2-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm X1E80100 SoC CSI2 PHY
+
+maintainers:
+  - Bryan O'Donoghue <bod@kernel.org>
+
+description:
+  Qualcomm MIPI CSI2 C-PHY/D-PHY combination PHY. Connects MIPI CSI2 sensors
+  to Qualcomm's Camera CSI Decoder. The PHY supports both C-PHY and D-PHY
+  modes.
+
+properties:
+  compatible:
+    const: qcom,x1e80100-csi2-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 1
+    description:
+      The single cell specifies the PHY operating mode.
+
+  clocks:
+    maxItems: 3
+
+  clock-names:
+    items:
+      - const: core
+      - const: timer
+      - const: ahb
+
+  interrupts:
+    maxItems: 1
+
+  operating-points-v2: true
+
+  opp-table:
+    type: object
+
+  power-domains:
+    items:
+      - description: Titan Top GDSC - Titan ISP Block, Global Distributed Switch Controller.
+      - description: MMCX voltage rail
+      - description: MXC or MXA voltage rail
+
+  power-domain-names:
+    items:
+      - const: top
+      - const: mmcx
+      - const: mx
+
+  vdda-0p9-supply:
+    description: Phandle to a 0.9V regulator supply to a PHY.
+
+  vdda-1p2-supply:
+    description: Phandle to 1.2V regulator supply to a PHY.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        description:
+          Sensor input. Always present. A single sensor is described by a
+          single endpoint with one to four data lanes. DPHY split mode,
+          where two independent sensors share the same PHY, is described
+          by two endpoints; endpoint@0 with exactly two data-lanes and
+          endpoint@1 with exactly one data-lane.
+        unevaluatedProperties: false
+
+        patternProperties:
+          "^endpoint(@[0-9a-f]+)?$":
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+            properties:
+              data-lanes:
+                minItems: 1
+                maxItems: 4
+
+            required:
+              - data-lanes
+              - remote-endpoint
+
+        allOf:
+          - if:
+              required:
+                - endpoint@1
+            then:
+              properties:
+                endpoint@0:
+                  properties:
+                    data-lanes:
+                      minItems: 2
+                      maxItems: 2
+                endpoint@1:
+                  properties:
+                    data-lanes:
+                      maxItems: 1
+              required:
+                - endpoint@0
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Output to the CAMSS CSID controller.
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+  - clocks
+  - clock-names
+  - interrupts
+  - operating-points-v2
+  - power-domains
+  - power-domain-names
+  - vdda-0p9-supply
+  - vdda-1p2-supply
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/qcom,x1e80100-camcc.h>
+    #include <dt-bindings/clock/qcom,x1e80100-gcc.h>
+    #include <dt-bindings/power/qcom,rpmhpd.h>
+
+    phy@ace4000 {
+        compatible = "qcom,x1e80100-csi2-phy";
+        reg = <0x0ace4000 0x2000>;
+        #phy-cells = <1>;
+
+        clocks = <&camcc CAM_CC_CSIPHY0_CLK>,
+                 <&camcc CAM_CC_CSI0PHYTIMER_CLK>,
+                 <&camcc CAM_CC_CORE_AHB_CLK>;
+        clock-names = "core",
+                      "timer",
+                      "ahb";
+
+        interrupts = <GIC_SPI 477 IRQ_TYPE_EDGE_RISING>;
+
+        operating-points-v2 = <&csiphy_opp_table>;
+
+        power-domains = <&camcc CAM_CC_TITAN_TOP_GDSC>,
+                        <&rpmhpd RPMHPD_MMCX>,
+                        <&rpmhpd RPMHPD_MX>;
+        power-domain-names = "top",
+                             "mmcx",
+                             "mx";
+
+        vdda-0p9-supply = <&vreg_l2c_0p9>;
+        vdda-1p2-supply = <&vreg_l1c_1p2>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                csiphy0_in: endpoint {
+                    data-lanes = <0 1 2 3>;
+                    remote-endpoint = <&sensor_out>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                csiphy0_out: endpoint {
+                    remote-endpoint = <&csid_in>;
+                };
+            };
+        };
+
+        csiphy_opp_table: opp-table {
+            compatible = "operating-points-v2";
+
+            opp-300000000 {
+                opp-hz = /bits/ 64 <300000000>;
+                required-opps = <&rpmhpd_opp_low_svs_d1>,
+                                <&rpmhpd_opp_low_svs_d1>;
+            };
+        };
+    };

-- 
2.54.0


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