dt-bindings: media: Document bindings for DW MIPI CSI-2 Host

Add bindings for Synopsys DesignWare MIPI CSI-2 host.

Signed-off-by: Luis Oliveira <lolivei@synopsys.com>
[eugen.hristev@microchip.com: reworked binding, converted to yaml]
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

Author: ehristev

Documentation/devicetree/bindings/media/snps,dw-csi.yaml

@@ -0,0 +1,149 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/snps,dw-csi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare CSI-2 Host controller (csi2host)
+
+maintainers:
+  - Eugen Hristev <eugen.hristev@microchip.com>
+
+description:
+  CSI2HOST is used to receive image coming from an MIPI CSI-2 compatible
+  camera. It will convert the incoming CSI-2 stream into a dedicated
+  interface called the Synopsys IDI (Image Data Interface).
+  This interface is a 32-bit SoC internal only, and can be assimilated
+  with a CSI-2 interface.
+
+properties:
+  compatible:
+    const: snps,dw-csi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    description:
+      CSI2HOST can have two clocks connected. One clock is the
+      peripheral clock for the inside functionality of the hardware block.
+      This is named 'perclk'. The second clock can be the phy clock,
+      which is used to clock the phy via an internal link.
+      This clock is named 'phyclk', phy clock.
+    items:
+      - const: perclk
+      - const: phyclk
+
+  phys:
+    maxItems: 1
+    description: MIPI D-PHY
+
+  phy-names:
+    items:
+      - const: dphy
+
+  resets:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description:
+          Input port node, single endpoint describing the input port.
+
+        properties:
+          endpoint:
+            $ref: video-interfaces.yaml#
+            unevaluatedProperties: false
+            description: Endpoint connected to input device
+
+            properties:
+              bus-type:
+                const: 4
+
+              data-lanes:
+                minItems: 1
+                maxItems: 4
+                items:
+                  maximum: 4
+
+              clock-lanes:
+                maxItems: 1
+
+              remote-endpoint: true
+
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description:
+          Output port node, single endpoint describing the output port.
+
+        properties:
+          endpoint:
+            unevaluatedProperties: false
+            $ref: video-interfaces.yaml#
+            description: Endpoint connected to output device
+
+            properties:
+              bus-type:
+                const: 4
+
+              remote-endpoint: true
+
+    required:
+      - port@0
+      - port@1
+
+additionalProperties: false
+
+required:
+  - compatible
+  - ports
+
+examples:
+  - |
+    csi2: csi2@3000 {
+        compatible = "snps,dw-csi";
+        reg = <0x03000 0x7FF>;
+        phys = <&mipi_dphy_rx>;
+        phy-names = "dphy";
+        resets = <&dw_rst 1>;
+        interrupts = <2>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+
+                csi_ep1: endpoint {
+                    bus-type = <4>; /* MIPI CSI2 D-PHY */
+                    remote-endpoint = <&camera_1>;
+                    data-lanes = <1 2>;
+                    clock-lanes = <0>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                csi_ep2: endpoint {
+                    remote-endpoint = <&idi_receiver>;
+                    bus-type = <4>;
+                };
+            };
+        };
+    };
+
+...