media: dt-bindings: Add Intersil ISL79987 DT bindings

Add bindings for the Intersil ISL79987 analog to MIPI CSI-2 decoder.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
To: linux-media@vger.kernel.org
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

Documentation/devicetree/bindings/media/i2c/isil,isl79987.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/isil,isl79987.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Intersil ISL79987 Analog to MIPI CSI-2 decoder
+
+maintainers:
+  - Michael Tretter <m.tretter@pengutronix.de>
+  - Marek Vasut <marex@denx.de>
+
+description:
+  The Intersil ISL79987 is an analog to MIPI CSI-2 decoder which is capable of
+  receiving up to four analog stream and multiplexing them into up to four MIPI
+  CSI-2 virtual channels, using one MIPI clock lane and 1/2 data lanes.
+
+properties:
+  compatible:
+    enum:
+      - isil,isl79987
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      A GPIO spec for the RSTB pin (active high)
+
+  powerdown-gpios:
+    maxItems: 1
+    description:
+      A GPIO spec for the Power Down pin (active high)
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: Output port
+
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                minItems: 1
+                maxItems: 2
+
+            required:
+              - data-lanes
+
+    patternProperties:
+      "^port@[1-4]$":
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Input ports
+
+    required:
+      - port@0
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - ports
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      isl7998x_mipi@44 {
+        compatible = "isil,isl79987";
+        reg = <0x44>;
+        powerdown-gpios = <&gpio3 27 GPIO_ACTIVE_HIGH>;
+        reset-gpios = <&gpio3 28 GPIO_ACTIVE_HIGH>;
+
+        ports {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          port@0 {
+            reg = <0>;
+            isl79987_out: endpoint {
+              remote-endpoint = <&mipi_csi2_in>;
+              data-lanes = <1 2>;
+            };
+          };
+
+          port@1 {
+            reg = <1>;
+            endpoint {
+              remote-endpoint = <&camera_0>;
+            };
+          };
+
+          port@2 {
+            reg = <2>;
+            endpoint {
+              remote-endpoint = <&camera_1>;
+            };
+          };
+        };
+      };
+    };