dt-bindings: display: tegra: Document Tegra20 and Tegra30 CSI

Document CSI HW block found in Tegra20 and Tegra30 SoC.

The #nvidia,mipi-calibrate-cells is not an introduction of property, such
property already exists in nvidia,tegra114-mipi.yaml and is used in
multiple device trees. In case of Tegra30 and Tegra20 CSI block combines
mipi calibration function and CSI function, in Tegra114+ mipi calibration
got a dedicated hardware block which is already supported. This property
here is used to align with mipi-calibration logic used by Tegra114+.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-csi.yaml

@@ -0,0 +1,138 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra20-csi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra20 CSI controller
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra20-csi
+      - nvidia,tegra30-csi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 1
+    items:
+      - description: module clock
+      - description: PAD A clock
+      - description: PAD B clock
+
+  clock-names:
+    items:
+      - const: csi
+      - const: csia-pad
+      - const: csib-pad
+
+  avdd-dsi-csi-supply:
+    description: DSI/CSI power supply. Must supply 1.2 V.
+
+  power-domains:
+    maxItems: 1
+
+  "#nvidia,mipi-calibrate-cells":
+    description:
+      The number of cells in a MIPI calibration specifier. Should be 1.
+      The single cell specifies an id of the pad that need to be
+      calibrated for a given device. Valid pad ids for receiver would be
+      0 for CSI-A; 1 for CSI-B; 2 for DSI-A and 3 for DSI-B.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    const: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^channel@[0-1]$":
+    type: object
+    description: channel 0 represents CSI-A and 1 represents CSI-B
+    additionalProperties: false
+
+    properties:
+      reg:
+        maximum: 1
+
+      nvidia,mipi-calibrate:
+        description: Should contain a phandle and a specifier specifying
+          which pad is used by this CSI channel and needs to be calibrated.
+        $ref: /schemas/types.yaml#/definitions/phandle-array
+
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: port receiving the video stream from the sensor
+
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            required:
+              - data-lanes
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: port sending the video stream to the VI
+
+    required:
+      - reg
+      - "#address-cells"
+      - "#size-cells"
+      - port@0
+      - port@1
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nvidia,tegra20-csi
+    then:
+      properties:
+        clocks:
+          maxItems: 1
+
+        clock-names: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nvidia,tegra30-csi
+    then:
+      properties:
+        clocks:
+          minItems: 3
+
+        clock-names:
+          minItems: 3
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - power-domains
+  - "#address-cells"
+  - "#size-cells"
+
+# see nvidia,tegra20-vi.yaml for an example