media: dt-bindings: media: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem

Add bindings documentation for Xilinx MIPI CSI-2 Rx Subsystem.

The Xilinx MIPI CSI-2 Rx Subsystem consists of a CSI-2 Rx controller, a
D-PHY in Rx mode and a Video Format Bridge.

[Fix indentation error in if...then...else]
[Fix number of cells in reg property]
Signed-off-by: Vishal Sagar <vishal.sagar@xilinx.com>
Reviewed-by: Hyun Kwon <hyun.kwon@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/xilinx/xlnx,csi2rxss.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/xilinx/xlnx,csi2rxss.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx MIPI CSI-2 Receiver Subsystem
+
+maintainers:
+  - Vishal Sagar <vishal.sagar@xilinx.com>
+
+description: |
+  The Xilinx MIPI CSI-2 Receiver Subsystem is used to capture MIPI CSI-2
+  traffic from compliant camera sensors and send the output as AXI4 Stream
+  video data for image processing.
+  The subsystem consists of a MIPI D-PHY in slave mode which captures the
+  data packets. This is passed along the MIPI CSI-2 Rx IP which extracts the
+  packet data. The optional Video Format Bridge (VFB) converts this data to
+  AXI4 Stream video data.
+  For more details, please refer to PG232 Xilinx MIPI CSI-2 Receiver Subsystem.
+  Please note that this bindings includes only the MIPI CSI-2 Rx controller
+  and Video Format Bridge and not D-PHY.
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - xlnx,mipi-csi2-rx-subsystem-5.0
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: List of clock specifiers
+    items:
+      - description: AXI Lite clock
+      - description: Video clock
+
+  clock-names:
+    items:
+      - const: lite_aclk
+      - const: video_aclk
+
+  xlnx,csi-pxl-format:
+    description: |
+      This denotes the CSI Data type selected in hw design.
+      Packets other than this data type (except for RAW8 and
+      User defined data types) will be filtered out.
+      Possible values are as below -
+      0x1e - YUV4228B
+      0x1f - YUV42210B
+      0x20 - RGB444
+      0x21 - RGB555
+      0x22 - RGB565
+      0x23 - RGB666
+      0x24 - RGB888
+      0x28 - RAW6
+      0x29 - RAW7
+      0x2a - RAW8
+      0x2b - RAW10
+      0x2c - RAW12
+      0x2d - RAW14
+      0x2e - RAW16
+      0x2f - RAW20
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+      - anyOf:
+        - minimum: 0x1e
+        - maximum: 0x24
+        - minimum: 0x28
+        - maximum: 0x2f
+
+  xlnx,vfb:
+    type: boolean
+    description: Present when Video Format Bridge is enabled in IP configuration
+
+  xlnx,en-csi-v2-0:
+    type: boolean
+    description: Present if CSI v2 is enabled in IP configuration.
+
+  xlnx,en-vcx:
+    type: boolean
+    description: |
+      When present, there are maximum 16 virtual channels, else only 4.
+
+  xlnx,en-active-lanes:
+    type: boolean
+    description: |
+      Present if the number of active lanes can be re-configured at
+      runtime in the Protocol Configuration Register. Otherwise all lanes,
+      as set in IP configuration, are always active.
+
+  video-reset-gpios:
+    description: Optional specifier for a GPIO that asserts video_aresetn.
+    maxItems: 1
+
+  ports:
+    type: object
+
+    properties:
+      port@0:
+        type: object
+        description: |
+          Input / sink port node, single endpoint describing the
+          CSI-2 transmitter.
+
+        properties:
+          reg:
+            const: 0
+
+          endpoint:
+            type: object
+
+            properties:
+
+              data-lanes:
+                description: |
+                  This is required only in the sink port 0 endpoint which
+                  connects to MIPI CSI-2 source like sensor.
+                  The possible values are -
+                  1       - For 1 lane enabled in IP.
+                  1 2     - For 2 lanes enabled in IP.
+                  1 2 3   - For 3 lanes enabled in IP.
+                  1 2 3 4 - For 4 lanes enabled in IP.
+                items:
+                  - const: 1
+                  - const: 2
+                  - const: 3
+                  - const: 4
+
+              remote-endpoint: true
+
+            required:
+              - data-lanes
+              - remote-endpoint
+
+            additionalProperties: false
+
+        additionalProperties: false
+
+      port@1:
+        type: object
+        description: |
+          Output / source port node, endpoint describing modules
+          connected the CSI-2 receiver.
+
+        properties:
+
+          reg:
+            const: 1
+
+          endpoint:
+            type: object
+
+            properties:
+
+              remote-endpoint: true
+
+            required:
+              - remote-endpoint
+
+            additionalProperties: false
+
+        additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - ports
+
+allOf:
+  - if:
+      required:
+        - xlnx,vfb
+    then:
+      required:
+        - xlnx,csi-pxl-format
+    else:
+      properties:
+        xlnx,csi-pxl-format: false
+
+  - if:
+      not:
+        required:
+          - xlnx,en-csi-v2-0
+    then:
+      properties:
+        xlnx,en-vcx: false
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    xcsi2rxss_1: csi2rx@a0020000 {
+        compatible = "xlnx,mipi-csi2-rx-subsystem-5.0";
+        reg = <0xa0020000 0x10000>;
+        interrupt-parent = <&gic>;
+        interrupts = <0 95 4>;
+        xlnx,csi-pxl-format = <0x2a>;
+        xlnx,vfb;
+        xlnx,en-active-lanes;
+        xlnx,en-csi-v2-0;
+        xlnx,en-vcx;
+        clock-names = "lite_aclk", "video_aclk";
+        clocks = <&misc_clk_0>, <&misc_clk_1>;
+        video-reset-gpios = <&gpio 86 GPIO_ACTIVE_LOW>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                /* Sink port */
+                reg = <0>;
+                csiss_in: endpoint {
+                    data-lanes = <1 2 3 4>;
+                    /* MIPI CSI-2 Camera handle */
+                    remote-endpoint = <&camera_out>;
+                };
+            };
+            port@1 {
+                /* Source port */
+                reg = <1>;
+                csiss_out: endpoint {
+                    remote-endpoint = <&vproc_in>;
+                };
+            };
+        };
+    };
+...